Csharp/C Sharp by API/System.Windows.Forms/Keys
Keys.Control
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {
[DllImport("User32.dll")] private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Label lbl; private System.Windows.Forms.Button cmdAsyncState; public Form1() { InitializeComponent(); } private void Form1_KeyPress(object sender, KeyPressEventArgs e) { e.Handled = true; } private void Form1_KeyDown(object sender, KeyEventArgs e) { lbl.Text = "Key Down: " + e.KeyValue.ToString(); lbl.Text += "\nKey Code: " + e.KeyCode.ToString(); lbl.Text += "\nKey Data: " + e.KeyData.ToString(); if ((e.Modifiers & Keys.Shift) == Keys.Shift) { lbl.Text += "\n" + "Shift was held down."; } if ((e.Modifiers & Keys.Control) == Keys.Control) { lbl.Text += "\n" + "Control was held down."; } if (e.Alt) { lbl.Text += "\n" + "Alt was held down."; } } private void cmdAsyncState_Click(object sender, EventArgs e) { int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString()); switch (state) { case 0: lbl.Text = "A has not been pressed since the last call."; break; case 1: lbl.Text = "A is not currently pressed, but has been pressed since the last call."; break; case -32767: lbl.Text = "A is currently pressed."; break; } } private void InitializeComponent() { this.textBox1 = new System.Windows.Forms.TextBox(); this.lbl = new System.Windows.Forms.Label(); this.cmdAsyncState = new System.Windows.Forms.Button(); this.SuspendLayout(); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(36, 36); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(205, 21); this.textBox1.TabIndex = 0; this.textBox1.Text = "<Text will never appear here>"; // // lbl // this.lbl.AutoSize = true; this.lbl.Location = new System.Drawing.Point(35, 77); this.lbl.Name = "lbl"; this.lbl.Size = new System.Drawing.Size(0, 0); this.lbl.TabIndex = 1; // // cmdAsyncState // this.cmdAsyncState.Location = new System.Drawing.Point(36, 202); this.cmdAsyncState.Name = "cmdAsyncState"; this.cmdAsyncState.Size = new System.Drawing.Size(141, 24); this.cmdAsyncState.TabIndex = 2; this.cmdAsyncState.Text = "GetAsyncState() for \"A\""; this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.cmdAsyncState); this.Controls.Add(this.lbl); this.Controls.Add(this.textBox1); this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0))); this.KeyPreview = true; this.Name = "Form1"; this.Text = "KeyTest"; this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress); this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown); this.ResumeLayout(false); this.PerformLayout(); }
[STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Form1()); }
}
</source>
Keys.Escape
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Text; namespace KeyboardSample {
public class KeyboardSample : System.Windows.Forms.Form { private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.Label label1; private System.Windows.Forms.GroupBox groupBox2; private System.Windows.Forms.Label label2; private System.ruponentModel.Container components = null; public KeyboardSample() { InitializeComponent(); } private void InitializeComponent() { this.textBox1 = new System.Windows.Forms.TextBox(); this.textBox2 = new System.Windows.Forms.TextBox(); this.groupBox1 = new System.Windows.Forms.GroupBox(); this.label1 = new System.Windows.Forms.Label(); this.groupBox2 = new System.Windows.Forms.GroupBox(); this.label2 = new System.Windows.Forms.Label(); this.groupBox1.SuspendLayout(); this.groupBox2.SuspendLayout(); this.SuspendLayout(); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(16, 24); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(168, 20); this.textBox1.TabIndex = 5; this.textBox1.Text = ""; this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown); // // textBox2 // this.textBox2.Location = new System.Drawing.Point(16, 24); this.textBox2.Name = "textBox2"; this.textBox2.Size = new System.Drawing.Size(168, 20); this.textBox2.TabIndex = 6; this.textBox2.Text = ""; this.textBox2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox2_KeyDown); // // groupBox1 // this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] { this.label1, this.textBox1}); this.groupBox1.Location = new System.Drawing.Point(8, 8); this.groupBox1.Name = "groupBox1"; this.groupBox1.TabIndex = 7; this.groupBox1.TabStop = false; this.groupBox1.Text = "Key Monitor"; // // label1 // this.label1.Location = new System.Drawing.Point(16, 64); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(168, 20); this.label1.TabIndex = 6; // // groupBox2 // this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] { this.textBox2, this.label2}); this.groupBox2.Location = new System.Drawing.Point(8, 120); this.groupBox2.Name = "groupBox2"; this.groupBox2.TabIndex = 8; this.groupBox2.TabStop = false; this.groupBox2.Text = "Keys Enumeration"; // // label2 // this.label2.Location = new System.Drawing.Point(16, 64); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(168, 20); this.label2.TabIndex = 9; // // KeyboardSample // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(216, 229); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.groupBox2, this.groupBox1}); this.Name = "KeyboardSample"; this.Text = "KeyboardSample"; this.groupBox1.ResumeLayout(false); this.groupBox2.ResumeLayout(false); this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new KeyboardSample()); } private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { label1.Text = Convert.ToString(e.KeyValue); } private void textBox2_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { StringBuilder sb = new StringBuilder(); if(e.Shift) sb.Append("Shift, "); if(e.Alt) sb.Append("Alt, "); if(e.Control) sb.Append("Ctrl, "); if(e.KeyCode==Keys.W||e.KeyCode==Keys.R||e.KeyCode==Keys.O||e.KeyCode==Keys.X) { sb.Append("Wrox Press!!"); } else if(e.KeyCode==Keys.Escape&&e.Modifiers==(Keys.Shift|Keys.Alt)) { sb.Append("Escape - that won"t work!"); } else if(e.KeyCode == Keys.C && e.Modifiers==(Keys.Alt | Keys.Control)) { sb.Append("CopyRight"); textBox2.SelectedText = "CopyRight"; textBox2.SelectionLength = 0; } else { sb.Append(Convert.ToString(e.KeyData)); } label2.Text = sb.ToString(); } }
}
</source>
Keys.X
<source lang="csharp"> using System; using System.Drawing; using System.Windows.Forms;
class ExitOnX: Form {
public static void Main() { Application.Run(new ExitOnX()); } public ExitOnX() { Text = "Exit on X"; } protected override void OnKeyDown(KeyEventArgs kea) { if (kea.KeyCode == Keys.X) Close(); }
}
</source>