C# 实现的三种方式实现模拟键盘按键

转载：https://www.jb51.cc/csharp/459208.html

1.发送字符串，这里的字符串可以为任意字符

private void button1_Click(object sender,EventArgs e)
{
    textBox1.Focus();
    SendKeys.Send("{A}");
}
           

2.模拟组合键：CTRL + A

private void button1_Click(object sender,EventArgs e)
{
    webBrowser1.Focus();
    SendKeys.Send("^{A}");
}
           

3.SendKeys.Send  异步模拟按键(不阻塞UI)

按键参考：https://docs.microsoft.com/zh-cn/windows/win32/inputdev/virtual-key-codes

[DllImport("user32.dll", EntryPoint = "keybd_event", SetLastError = true)]
//bvk 按键的虚拟键值，如回车键为 vk_return, tab 键为 vk_tab（其他具体的参见附录）
//bScan 扫描码，一般不用设置，用 0 代替就行；
//dwFlags 选项标志，如果为 keydown 则置 0 即可，如果为 keyup 则设成 "KEYEVENTF_KEYUP"；
//dwExtraInfo 一般也是置 0 即可。
public static extern void keybd_event(Keys bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

private void button1_Click(object sender,EventArgs e)
{
    textBox1.Focus();
    keybd_event(Keys.A, 0, 0, 0);
}
           

4.模拟组合键：CTRL + A

public const int KEYEVENTF_KEYUP = 2;

private void button1_Click(object sender,EventArgs e)
{
    webBrowser1.Focus();
    keybd_event(Keys.ControlKey,0,0,0);
    keybd_event(Keys.A,0,0,0);
    keybd_event(Keys.ControlKey,KEYEVENTF_KEYUP,0,0);
}
           

5.上面两种方式都是全局范围呢，现在介绍如何对单个窗口进行模拟按键

下面代码没测试过，不知道有用没有

[DllImport("user32.dll",EntryPoint = "PostMessageA",SetLastError = true)]
public static extern int PostMessage(IntPtr hWnd,int Msg,Keys wParam,int lParam);

public const int WM_CHAR = 256;

private void button1_Click(object sender,EventArgs e)
{
    textBox1.Focus();
    PostMessage(textBox1.Handle,256,Keys.A,2);
}
           

public const int WM_KEYDOWN = 256;
public const int WM_KEYUP = 257;

private void button1_Click(object sender,0); 
    PostMessage(webBrowser1.Handle,WM_KEYDOWN,0);
}
           

end