using System; using System.Collections.Generic; using System.ComponentModel; 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 += " Key Code: " + e.KeyCode.ToString(); lbl.Text += " Key Data: " + e.KeyData.ToString(); if ((e.Modifiers & Keys.Shift) == Keys.Shift) { lbl.Text += " " + "Shift was held down."; } if ((e.Modifiers & Keys.Control) == Keys.Control) { lbl.Text += " " + "Control was held down."; } if (e.Alt) { lbl.Text += " " + "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()); } }