本文转自：
https://www.cnblogs.com/xielong/p/6763121.html
如何模拟键盘按键触发产生的事件，比如模拟按下Alt + F4 关闭当前程序，Ctrl+Shift 切换输入法等。可以通过win32api 键盘事件 keybd_event() 来实现
1、定义键盘按键对应得键码
#region bVk参数 常量定义
public const byte vbKeyLButton = 0x1; // 鼠标左键
public const byte vbKeyRButton = 0x2; // 鼠标右键
public const byte vbKeyCancel = 0x3; // CANCEL 键
public const byte vbKeyMButton = 0x4; // 鼠标中键
public const byte vbKeyBack = 0x8; // BACKSPACE 键 空格键
public const byte vbKeyTab = 0x9; // TAB 键
public const byte vbKeyClear = 0xC; // CLEAR 键
public const byte vbKeyReturn = 0xD; // ENTER 键
public const byte vbKeyShift = 0x10; // SHIFT 键
public const byte vbKeyControl = 0x11; // CTRL 键
public const byte vbKeyAlt = 18; // Alt 键 (键码18)
public const byte vbKeyMenu = 0x12; // MENU 键
public const byte vbKeyPause = 0x13; // PAUSE 键
public const byte vbKeyCapital = 0x14; // CAPS LOCK 键
public const byte vbKeyEscape = 0x1B; // ESC 键
public const byte vbKeySpace = 0x20; // SPACEBAR 键
public const byte vbKeyPageUp = 0x21; // PAGE UP 键
public const byte vbKeyEnd = 0x23; // End 键
public const byte vbKeyHome = 0x24; // HOME 键
public const byte vbKeyLeft = 0x25; // LEFT ARROW 键
public const byte vbKeyUp = 0x26; // UP ARROW 键
public const byte vbKeyRight = 0x27; // RIGHT ARROW 键
public const byte vbKeyDown = 0x28; // DOWN ARROW 键
public const byte vbKeySelect = 0x29; // Select 键
public const byte vbKeyPrint = 0x2A; // PRINT SCREEN 键
public const byte vbKeyExecute = 0x2B; // EXECUTE 键
public const byte vbKeySnapshot = 0x2C; // SNAPSHOT 键
public const byte vbKeyDelete = 0x2E; // Delete 键
public const byte vbKeyHelp = 0x2F; // HELP 键
public const byte vbKeyNumlock = 0x90; // NUM LOCK 键
//常用键 字母键A到Z
public const byte vbKeyA = 65;
public const byte vbKeyB = 66;
public const byte vbKeyC = 67;
public const byte vbKeyD = 68;
public const byte vbKeyE = 69;
public const byte vbKeyF = 70;
public const byte vbKeyG = 71;
public const byte vbKeyH = 72;
public const byte vbKeyI = 73;
public const byte vbKeyJ = 74;
public const byte vbKeyK = 75;
public const byte vbKeyL = 76;
public const byte vbKeyM = 77;
public const byte vbKeyN = 78;
public const byte vbKeyO = 79 ;
public const byte vbKeyP = 80 ;
public const byte vbKeyQ = 81 ;
public const byte vbKeyR = 82 ;
public const byte vbKeyS = 83 ;
public const byte vbKeyT = 84 ;
public const byte vbKeyU = 85 ;
public const byte vbKeyV = 86 ;
public const byte vbKeyW = 87 ;
public const byte vbKeyX = 88 ;
public const byte vbKeyY = 89 ;
public const byte vbKeyZ = 90 ;
//数字键盘0到9
public const byte vbKey0 = 48 ; // 0 键
public const byte vbKey1 = 49 ; // 1 键
public const byte vbKey2 = 50 ; // 2 键
public const byte vbKey3 = 51 ; // 3 键
public const byte vbKey4 = 52 ; // 4 键
public const byte vbKey5 = 53 ; // 5 键
public const byte vbKey6 = 54 ; // 6 键
public const byte vbKey7 = 55 ; // 7 键
public const byte vbKey8 = 56 ; // 8 键
public const byte vbKey9 = 57 ; // 9 键
public const byte vbKeyNumpad0 = 0x60 ; //0 键
public const byte vbKeyNumpad1 = 0x61 ; //1 键
public const byte vbKeyNumpad2 = 0x62 ; //2 键
public const byte vbKeyNumpad3 = 0x63 ; //3 键
public const byte vbKeyNumpad4 = 0x64 ; //4 键
public const byte vbKeyNumpad5 = 0x65 ; //5 键
public const byte vbKeyNumpad6 = 0x66 ; //6 键
public const byte vbKeyNumpad7 = 0x67 ; //7 键
public const byte vbKeyNumpad8 = 0x68 ; //8 键
public const byte vbKeyNumpad9 = 0x69 ; //9 键
public const byte vbKeyMultiply = 0x6A ; // MULTIPLICATIONSIGN(*)键
public const byte vbKeyAdd = 0x6B ; // PLUS SIGN(+) 键
public const byte vbKeySeparator = 0x6C ; // ENTER 键
public const byte vbKeySubtract = 0x6D ; // MINUS SIGN(-) 键
public const byte vbKeyDecimal = 0x6E ; // DECIMAL POINT(.) 键
public const byte vbKeyDivide = 0x6F ; // DIVISION SIGN(/) 键
//F1到F12按键
public const byte vbKeyF1 = 0x70 ; //F1 键
public const byte vbKeyF2 = 0x71 ; //F2 键
public const byte vbKeyF3 = 0x72 ; //F3 键
public const byte vbKeyF4 = 0x73 ; //F4 键
public const byte vbKeyF5 = 0x74 ; //F5 键
public const byte vbKeyF6 = 0x75 ; //F6 键
public const byte vbKeyF7 = 0x76 ; //F7 键
public const byte vbKeyF8 = 0x77 ; //F8 键
public const byte vbKeyF9 = 0x78 ; //F9 键
public const byte vbKeyF10 = 0x79 ; //F10 键
public const byte vbKeyF11 = 0x7A ; //F11 键
public const byte vbKeyF12 = 0x7B ; //F12 键
#endregion2、引用win32api键盘函数
#region 引用win32api方法
/// <summary>
/// 导入模拟键盘的方法
/// </summary>
/// <param name="bVk" >按键的虚拟键值</param>
/// <param name= "bScan" >扫描码，一般不用设置，用0代替就行</param>
/// <param name= "dwFlags" >选项标志：0：表示按下，2：表示松开</param>
/// <param name= "dwExtraInfo">一般设置为0</param>
[DllImport("user32.dll")]
public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
#endregion3、使用例子
2）按钮方法
/// <summary>
/// 默认按下ctrl+shift切换输入法
/// </summary>
/// <param name= sender ></param>
/// <param name= e ></param>
private void button1_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0,0,0);
//模拟按下shift键
keybd_event(vbKeyShift, 0, 0, 0);
//松开按键ctrl
keybd_event(vbKeyControl, 0, 2, 0);
//松开按键shift
keybd_event(vbKeyShift, 0, 2, 0);
}
/// <summary>
/// 使用QQ的截图快捷按键（前提：开启QQ）
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0, 0, 0);
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下A键
keybd_event(vbKeyA, 0, 0, 0);
//模拟松开ctrl键
keybd_event(vbKeyControl, 0, 2, 0);
//模拟松开Alt键
keybd_event(vbKeyAlt, 0, 2, 0);
//模拟松开A键
keybd_event(vbKeyA, 0, 2, 0);
}
/// <summary>
/// 模拟 Alt+F4按键 关闭窗体程序
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button3_Click(object sender, EventArgs e)
{
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下F4键
keybd_event(vbKeyF4, 0, 0, 0);
//松开按键Alt
keybd_event(vbKeyAlt, 0, 2, 0);
//松开按键F4
keybd_event(vbKeyF4, 0, 2, 0);
}
/// <summary>
/// 模拟Ctrl+Alt+Z按键 显示已最小化QQ界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0, 0, 0);
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下Z键
keybd_event(vbKeyZ, 0, 0, 0);
//模拟松开ctrl键
keybd_event(vbKeyControl, 0, 2, 0);
//模拟松开Alt键
keybd_event(vbKeyAlt, 0, 2, 0);
//模拟松开Z键
keybd_event(vbKeyZ, 0, 2, 0);
}4、完整源码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsForms
{
public partial class Form4 : Form
{
public Form4()
{
InitializeComponent();
}
#region bVk参数 常量定义
public const byte vbKeyLButton = 0x1; // 鼠标左键
public const byte vbKeyRButton = 0x2; // 鼠标右键
public const byte vbKeyCancel = 0x3; // CANCEL 键
public const byte vbKeyMButton = 0x4; // 鼠标中键
public const byte vbKeyBack = 0x8; // BACKSPACE 键
public const byte vbKeyTab = 0x9; // TAB 键
public const byte vbKeyClear = 0xC; // CLEAR 键
public const byte vbKeyReturn = 0xD; // ENTER 键
public const byte vbKeyShift = 0x10; // SHIFT 键
public const byte vbKeyControl = 0x11; // CTRL 键
public const byte vbKeyAlt = 18; // Alt 键 (键码18)
public const byte vbKeyMenu = 0x12; // MENU 键
public const byte vbKeyPause = 0x13; // PAUSE 键
public const byte vbKeyCapital = 0x14; // CAPS LOCK 键
public const byte vbKeyEscape = 0x1B; // ESC 键
public const byte vbKeySpace = 0x20; // SPACEBAR 键
public const byte vbKeyPageUp = 0x21; // PAGE UP 键
public const byte vbKeyEnd = 0x23; // End 键
public const byte vbKeyHome = 0x24; // HOME 键
public const byte vbKeyLeft = 0x25; // LEFT ARROW 键
public const byte vbKeyUp = 0x26; // UP ARROW 键
public const byte vbKeyRight = 0x27; // RIGHT ARROW 键
public const byte vbKeyDown = 0x28; // DOWN ARROW 键
public const byte vbKeySelect = 0x29; // Select 键
public const byte vbKeyPrint = 0x2A; // PRINT SCREEN 键
public const byte vbKeyExecute = 0x2B; // EXECUTE 键
public const byte vbKeySnapshot = 0x2C; // SNAPSHOT 键
public const byte vbKeyDelete = 0x2E; // Delete 键
public const byte vbKeyHelp = 0x2F; // HELP 键
public const byte vbKeyNumlock = 0x90; // NUM LOCK 键
//常用键 字母键A到Z
public const byte vbKeyA = 65;
public const byte vbKeyB = 66;
public const byte vbKeyC = 67;
public const byte vbKeyD = 68;
public const byte vbKeyE = 69;
public const byte vbKeyF = 70;
public const byte vbKeyG = 71;
public const byte vbKeyH = 72;
public const byte vbKeyI = 73;
public const byte vbKeyJ = 74;
public const byte vbKeyK = 75;
public const byte vbKeyL = 76;
public const byte vbKeyM = 77;
public const byte vbKeyN = 78;
public const byte vbKeyO = 79 ;
public const byte vbKeyP = 80 ;
public const byte vbKeyQ = 81 ;
public const byte vbKeyR = 82 ;
public const byte vbKeyS = 83 ;
public const byte vbKeyT = 84 ;
public const byte vbKeyU = 85 ;
public const byte vbKeyV = 86 ;
public const byte vbKeyW = 87 ;
public const byte vbKeyX = 88 ;
public const byte vbKeyY = 89 ;
public const byte vbKeyZ = 90 ;
//数字键盘0到9
public const byte vbKey0 = 48 ; // 0 键
public const byte vbKey1 = 49 ; // 1 键
public const byte vbKey2 = 50 ; // 2 键
public const byte vbKey3 = 51 ; // 3 键
public const byte vbKey4 = 52 ; // 4 键
public const byte vbKey5 = 53 ; // 5 键
public const byte vbKey6 = 54 ; // 6 键
public const byte vbKey7 = 55 ; // 7 键
public const byte vbKey8 = 56 ; // 8 键
public const byte vbKey9 = 57 ; // 9 键
public const byte vbKeyNumpad0 = 0x60 ; //0 键
public const byte vbKeyNumpad1 = 0x61 ; //1 键
public const byte vbKeyNumpad2 = 0x62 ; //2 键
public const byte vbKeyNumpad3 = 0x63 ; //3 键
public const byte vbKeyNumpad4 = 0x64 ; //4 键
public const byte vbKeyNumpad5 = 0x65 ; //5 键
public const byte vbKeyNumpad6 = 0x66 ; //6 键
public const byte vbKeyNumpad7 = 0x67 ; //7 键
public const byte vbKeyNumpad8 = 0x68 ; //8 键
public const byte vbKeyNumpad9 = 0x69 ; //9 键
public const byte vbKeyMultiply = 0x6A ; // MULTIPLICATIONSIGN(*)键
public const byte vbKeyAdd = 0x6B ; // PLUS SIGN(+) 键
public const byte vbKeySeparator = 0x6C ; // ENTER 键
public const byte vbKeySubtract = 0x6D ; // MINUS SIGN(-) 键
public const byte vbKeyDecimal = 0x6E ; // DECIMAL POINT(.) 键
public const byte vbKeyDivide = 0x6F ; // DIVISION SIGN(/) 键
//F1到F12按键
public const byte vbKeyF1 = 0x70 ; //F1 键
public const byte vbKeyF2 = 0x71 ; //F2 键
public const byte vbKeyF3 = 0x72 ; //F3 键
public const byte vbKeyF4 = 0x73 ; //F4 键
public const byte vbKeyF5 = 0x74 ; //F5 键
public const byte vbKeyF6 = 0x75 ; //F6 键
public const byte vbKeyF7 = 0x76 ; //F7 键
public const byte vbKeyF8 = 0x77 ; //F8 键
public const byte vbKeyF9 = 0x78 ; //F9 键
public const byte vbKeyF10 = 0x79 ; //F10 键
public const byte vbKeyF11 = 0x7A ; //F11 键
public const byte vbKeyF12 = 0x7B ; //F12 键
#endregion
#region 引用win32api方法
/// <summary>
/// 导入模拟键盘的方法
/// </summary>
/// <param name="bVk" >按键的虚拟键值</param>
/// <param name= "bScan" >扫描码，一般不用设置，用0代替就行</param>
/// <param name= "dwFlags" >选项标志：0：表示按下，2：表示松开</param>
/// <param name= "dwExtraInfo">一般设置为0</param>
[DllImport("user32.dll")]
public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
#endregion
/// <summary>
/// 默认按下ctrl+shift切换输入法
/// </summary>
/// <param name= sender ></param>
/// <param name= e ></param>
private void button1_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0,0,0);
//模拟按下shift键
keybd_event(vbKeyShift, 0, 0, 0);
//松开按键ctrl
keybd_event(vbKeyControl, 0, 2, 0);
//松开按键shift
keybd_event(vbKeyShift, 0, 2, 0);
}
/// <summary>
/// 使用QQ的截图快捷按键（前提：开启QQ）
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0, 0, 0);
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下A键
keybd_event(vbKeyA, 0, 0, 0);
//模拟松开ctrl键
keybd_event(vbKeyControl, 0, 2, 0);
//模拟松开Alt键
keybd_event(vbKeyAlt, 0, 2, 0);
//模拟松开A键
keybd_event(vbKeyA, 0, 2, 0);
}
/// <summary>
/// 模拟 Alt+F4按键 关闭窗体程序
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button3_Click(object sender, EventArgs e)
{
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下F4键
keybd_event(vbKeyF4, 0, 0, 0);
//松开按键Alt
keybd_event(vbKeyAlt, 0, 2, 0);
//松开按键F4
keybd_event(vbKeyF4, 0, 2, 0);
}
/// <summary>
/// 模拟Ctrl+Alt+Z按键 显示已最小化QQ界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{
//模拟按下ctrl键
keybd_event(vbKeyControl, 0, 0, 0);
//模拟按下Alt键
keybd_event(vbKeyAlt, 0, 0, 0);
//模拟按下Z键
keybd_event(vbKeyZ, 0, 0, 0);
//模拟松开ctrl键
keybd_event(vbKeyControl, 0, 2, 0);
//模拟松开Alt键
keybd_event(vbKeyAlt, 0, 2, 0);
//模拟松开Z键
keybd_event(vbKeyZ, 0, 2, 0);
}
}
}5、执行后效果图
1）模拟QQ截图按键
