431 lines
18 KiB
C#
431 lines
18 KiB
C#
using System;
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using System.Windows.Forms;
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using Ivi.Visa;
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using NationalInstruments.Visa;
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namespace NationalInstruments.Examples.SimpleAsynchronousReadWrite
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{
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/// <summary>
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/// Summary description for Form1.
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/// </summary>
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public class MainForm : System.Windows.Forms.Form
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{
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private MessageBasedSession mbSession;
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private string lastResourceString = null;
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private IVisaAsyncResult asyncHandle = null;
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private System.Windows.Forms.TextBox writeTextBox;
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private System.Windows.Forms.TextBox readTextBox;
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private System.Windows.Forms.Button writeButton;
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private System.Windows.Forms.Button readButton;
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private System.Windows.Forms.Button openSessionButton;
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private System.Windows.Forms.Button clearButton;
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private System.Windows.Forms.Button closeSessionButton;
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private System.Windows.Forms.Label stringToWriteLabel;
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private System.Windows.Forms.Label stringToReadLabel;
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private System.Windows.Forms.Button terminateButton;
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private System.Windows.Forms.Label elementsTransferredLabel;
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private System.Windows.Forms.TextBox elementsTransferredTextBox;
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private System.Windows.Forms.TextBox lastIOStatusTextBox;
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private System.Windows.Forms.Label lastIOStatusLabel;
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/// <summary>
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/// Required designer variable.
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/// </summary>
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private System.ComponentModel.Container components = null;
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public MainForm()
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{
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//
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// Required for Windows Form Designer support
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//
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InitializeComponent();
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SetupControlState(false);
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}
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/// <summary>
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/// Clean up any resources being used.
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/// </summary>
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protected override void Dispose( bool disposing )
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{
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if( disposing )
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{
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if(mbSession != null)
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{
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mbSession.Dispose();
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}
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if (components != null)
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{
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components.Dispose();
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}
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}
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base.Dispose( disposing );
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}
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#region Windows Form Designer generated code
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/// <summary>
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/// Required method for Designer support - do not modify
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/// the contents of this method with the code editor.
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/// </summary>
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private void InitializeComponent()
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{
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System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
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this.writeButton = new System.Windows.Forms.Button();
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this.readButton = new System.Windows.Forms.Button();
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this.openSessionButton = new System.Windows.Forms.Button();
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this.writeTextBox = new System.Windows.Forms.TextBox();
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this.readTextBox = new System.Windows.Forms.TextBox();
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this.clearButton = new System.Windows.Forms.Button();
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this.closeSessionButton = new System.Windows.Forms.Button();
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this.stringToWriteLabel = new System.Windows.Forms.Label();
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this.stringToReadLabel = new System.Windows.Forms.Label();
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this.terminateButton = new System.Windows.Forms.Button();
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this.elementsTransferredLabel = new System.Windows.Forms.Label();
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this.elementsTransferredTextBox = new System.Windows.Forms.TextBox();
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this.lastIOStatusTextBox = new System.Windows.Forms.TextBox();
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this.lastIOStatusLabel = new System.Windows.Forms.Label();
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this.SuspendLayout();
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//
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// writeButton
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//
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this.writeButton.Location = new System.Drawing.Point(5, 83);
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this.writeButton.Name = "writeButton";
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this.writeButton.Size = new System.Drawing.Size(74, 23);
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this.writeButton.TabIndex = 3;
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this.writeButton.Text = "Write";
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this.writeButton.Click += new System.EventHandler(this.write_Click);
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//
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// readButton
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//
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this.readButton.Location = new System.Drawing.Point(79, 83);
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this.readButton.Name = "readButton";
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this.readButton.Size = new System.Drawing.Size(74, 23);
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this.readButton.TabIndex = 4;
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this.readButton.Text = "Read";
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this.readButton.Click += new System.EventHandler(this.read_Click);
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//
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// openSessionButton
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//
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this.openSessionButton.Location = new System.Drawing.Point(5, 5);
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this.openSessionButton.Name = "openSessionButton";
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this.openSessionButton.Size = new System.Drawing.Size(92, 22);
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this.openSessionButton.TabIndex = 0;
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this.openSessionButton.Text = "Open Session";
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this.openSessionButton.Click += new System.EventHandler(this.openSession_Click);
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//
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// writeTextBox
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//
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this.writeTextBox.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
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| System.Windows.Forms.AnchorStyles.Right)));
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this.writeTextBox.Location = new System.Drawing.Point(5, 54);
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this.writeTextBox.Name = "writeTextBox";
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this.writeTextBox.Size = new System.Drawing.Size(275, 20);
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this.writeTextBox.TabIndex = 2;
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this.writeTextBox.Text = "*IDN?\\n";
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//
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// readTextBox
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//
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this.readTextBox.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
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| System.Windows.Forms.AnchorStyles.Left)
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| System.Windows.Forms.AnchorStyles.Right)));
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this.readTextBox.Location = new System.Drawing.Point(5, 136);
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this.readTextBox.Multiline = true;
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this.readTextBox.Name = "readTextBox";
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this.readTextBox.ReadOnly = true;
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this.readTextBox.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
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this.readTextBox.Size = new System.Drawing.Size(275, 158);
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this.readTextBox.TabIndex = 6;
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this.readTextBox.TabStop = false;
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//
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// clearButton
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//
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this.clearButton.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
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| System.Windows.Forms.AnchorStyles.Right)));
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this.clearButton.Location = new System.Drawing.Point(6, 344);
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this.clearButton.Name = "clearButton";
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this.clearButton.Size = new System.Drawing.Size(275, 24);
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this.clearButton.TabIndex = 6;
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this.clearButton.Text = "Clear";
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this.clearButton.Click += new System.EventHandler(this.clear_Click);
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//
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// closeSessionButton
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//
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this.closeSessionButton.Location = new System.Drawing.Point(97, 5);
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this.closeSessionButton.Name = "closeSessionButton";
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this.closeSessionButton.Size = new System.Drawing.Size(92, 22);
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this.closeSessionButton.TabIndex = 1;
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this.closeSessionButton.Text = "Close Session";
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this.closeSessionButton.Click += new System.EventHandler(this.closeSession_Click);
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//
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// stringToWriteLabel
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//
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this.stringToWriteLabel.Location = new System.Drawing.Point(5, 40);
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this.stringToWriteLabel.Name = "stringToWriteLabel";
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this.stringToWriteLabel.Size = new System.Drawing.Size(91, 14);
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this.stringToWriteLabel.TabIndex = 8;
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this.stringToWriteLabel.Text = "String to Write:";
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//
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// stringToReadLabel
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//
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this.stringToReadLabel.Location = new System.Drawing.Point(5, 122);
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this.stringToReadLabel.Name = "stringToReadLabel";
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this.stringToReadLabel.Size = new System.Drawing.Size(101, 14);
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this.stringToReadLabel.TabIndex = 9;
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this.stringToReadLabel.Text = "String Read:";
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//
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// terminateButton
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//
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this.terminateButton.Enabled = false;
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this.terminateButton.Location = new System.Drawing.Point(205, 83);
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this.terminateButton.Name = "terminateButton";
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this.terminateButton.Size = new System.Drawing.Size(74, 23);
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this.terminateButton.TabIndex = 5;
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this.terminateButton.Text = "Terminate";
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this.terminateButton.Click += new System.EventHandler(this.terminate_Click);
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//
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// elementsTransferredLabel
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//
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this.elementsTransferredLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
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this.elementsTransferredLabel.Location = new System.Drawing.Point(5, 308);
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this.elementsTransferredLabel.Name = "elementsTransferredLabel";
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this.elementsTransferredLabel.Size = new System.Drawing.Size(116, 11);
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this.elementsTransferredLabel.TabIndex = 11;
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this.elementsTransferredLabel.Text = "Elements Transferred:";
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//
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// elementsTransferredTextBox
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//
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this.elementsTransferredTextBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
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this.elementsTransferredTextBox.Location = new System.Drawing.Point(5, 321);
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this.elementsTransferredTextBox.Name = "elementsTransferredTextBox";
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this.elementsTransferredTextBox.ReadOnly = true;
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this.elementsTransferredTextBox.Size = new System.Drawing.Size(104, 20);
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this.elementsTransferredTextBox.TabIndex = 12;
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this.elementsTransferredTextBox.TabStop = false;
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//
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// lastIOStatusTextBox
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//
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this.lastIOStatusTextBox.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
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| System.Windows.Forms.AnchorStyles.Right)));
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this.lastIOStatusTextBox.Location = new System.Drawing.Point(113, 321);
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this.lastIOStatusTextBox.Name = "lastIOStatusTextBox";
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this.lastIOStatusTextBox.ReadOnly = true;
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this.lastIOStatusTextBox.Size = new System.Drawing.Size(168, 20);
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this.lastIOStatusTextBox.TabIndex = 14;
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this.lastIOStatusTextBox.TabStop = false;
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//
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// lastIOStatusLabel
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//
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this.lastIOStatusLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
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this.lastIOStatusLabel.Location = new System.Drawing.Point(113, 308);
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this.lastIOStatusLabel.Name = "lastIOStatusLabel";
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this.lastIOStatusLabel.Size = new System.Drawing.Size(116, 11);
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this.lastIOStatusLabel.TabIndex = 13;
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this.lastIOStatusLabel.Text = "Last I/O Status:";
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//
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// MainForm
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//
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this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
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this.ClientSize = new System.Drawing.Size(287, 376);
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this.Controls.Add(this.lastIOStatusTextBox);
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this.Controls.Add(this.elementsTransferredTextBox);
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this.Controls.Add(this.readTextBox);
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this.Controls.Add(this.writeTextBox);
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this.Controls.Add(this.lastIOStatusLabel);
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this.Controls.Add(this.elementsTransferredLabel);
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this.Controls.Add(this.terminateButton);
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this.Controls.Add(this.stringToReadLabel);
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this.Controls.Add(this.stringToWriteLabel);
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this.Controls.Add(this.closeSessionButton);
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this.Controls.Add(this.clearButton);
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this.Controls.Add(this.openSessionButton);
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this.Controls.Add(this.readButton);
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this.Controls.Add(this.writeButton);
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this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
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this.MaximizeBox = false;
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this.MinimumSize = new System.Drawing.Size(295, 316);
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this.Name = "MainForm";
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this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
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this.Text = "Simple Asynchronous Read/Write";
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this.ResumeLayout(false);
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this.PerformLayout();
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}
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#endregion
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/// <summary>
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/// The main entry point for the application.
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/// </summary>
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[STAThread]
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static void Main()
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{
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Application.Run(new MainForm());
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}
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private void openSession_Click(object sender, System.EventArgs e)
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{
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using (SelectResource sr = new SelectResource())
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{
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if(lastResourceString != null)
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{
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sr.ResourceName = lastResourceString;
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}
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DialogResult result = sr.ShowDialog(this);
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if(result == DialogResult.OK)
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{
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lastResourceString = sr.ResourceName;
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Cursor.Current = Cursors.WaitCursor;
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try
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{
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using (var rmSession = new ResourceManager())
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{
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mbSession = (MessageBasedSession)rmSession.Open(sr.ResourceName);
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// Use SynchronizeCallbacks to specify that the object marshals callbacks across threads appropriately.
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mbSession.SynchronizeCallbacks = true;
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SetupControlState(true);
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}
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}
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catch(Exception exp)
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{
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MessageBox.Show(exp.Message);
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}
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finally
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{
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Cursor.Current = Cursors.Default;
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}
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}
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}
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}
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private void closeSession_Click(object sender, System.EventArgs e)
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{
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SetupControlState(false);
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mbSession.Dispose();
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}
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private void write_Click(object sender, System.EventArgs e)
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{
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try
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{
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SetupWaitingControlState(true);
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string textToWrite = ReplaceCommonEscapeSequences(writeTextBox.Text);
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asyncHandle = mbSession.RawIO.BeginWrite(
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textToWrite,
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new VisaAsyncCallback(OnWriteComplete),
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(object)textToWrite.Length);
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}
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catch(Exception exp)
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{
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MessageBox.Show(exp.Message);
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}
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}
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private void read_Click(object sender, System.EventArgs e)
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{
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try
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{
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SetupWaitingControlState(true);
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asyncHandle = mbSession.RawIO.BeginRead(
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1024,
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new VisaAsyncCallback(OnReadComplete),
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null);
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}
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catch(Exception exp)
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{
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MessageBox.Show(exp.Message);
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}
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}
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private void clear_Click(object sender, System.EventArgs e)
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{
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ClearControls();
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}
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private void terminate_Click(object sender, System.EventArgs e)
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{
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SetupWaitingControlState(false);
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try
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{
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mbSession.RawIO.AbortAsyncOperation(asyncHandle);
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}
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catch(Exception exp)
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{
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MessageBox.Show(exp.Message);
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}
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}
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private void OnWriteComplete(IVisaAsyncResult result)
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{
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try
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{
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SetupWaitingControlState(false);
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mbSession.RawIO.EndWrite(result);
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lastIOStatusTextBox.Text = "Success";
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}
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catch(Exception exp)
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{
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lastIOStatusTextBox.Text = exp.Message;
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}
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elementsTransferredTextBox.Text = ((int)result.Count).ToString();
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}
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private void OnReadComplete(IVisaAsyncResult result)
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{
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try
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{
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SetupWaitingControlState(false);
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string responseString = mbSession.RawIO.EndReadString(result);
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readTextBox.Text = InsertCommonEscapeSequences(responseString);
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lastIOStatusTextBox.Text = "Success";
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}
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catch(Exception exp)
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{
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lastIOStatusTextBox.Text = exp.Message;
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}
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elementsTransferredTextBox.Text = ((int)result.Count).ToString();
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}
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private void SetupControlState(bool isSessionOpen)
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{
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openSessionButton.Enabled = !isSessionOpen;
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closeSessionButton.Enabled = isSessionOpen;
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writeButton.Enabled = isSessionOpen;
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readButton.Enabled = isSessionOpen;
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writeTextBox.Enabled = isSessionOpen;
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clearButton.Enabled = isSessionOpen;
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if(isSessionOpen)
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{
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ClearControls();
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writeTextBox.Focus();
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}
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}
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private void SetupWaitingControlState(bool operationIsInProgress)
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{
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if (operationIsInProgress)
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{
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readTextBox.Text = String.Empty;
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elementsTransferredTextBox.Text = String.Empty;
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lastIOStatusTextBox.Text = String.Empty;
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}
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terminateButton.Enabled = operationIsInProgress;
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writeButton.Enabled = !operationIsInProgress;
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readButton.Enabled = !operationIsInProgress;
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}
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private string ReplaceCommonEscapeSequences(string s)
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{
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return (s != null) ? s.Replace("\\n", "\n").Replace("\\r", "\r") : s;
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}
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private string InsertCommonEscapeSequences(string s)
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{
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return (s != null) ? s.Replace("\n", "\\n").Replace("\r", "\\r") : s;
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}
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private void ClearControls()
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{
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readTextBox.Text = String.Empty;
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lastIOStatusTextBox.Text = String.Empty;
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elementsTransferredTextBox.Text = String.Empty;
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}
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}
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}
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