C# 三种方式实现模拟键盘按键

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模拟按键在.Net 中有三种方式实现。

第一种方式：System.Windows.Forms.SendKeys

组合键：Ctrl = ^、Shift = +、Alt = %

模拟按键：A

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

模拟组合键：CTRL + A

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

SendKeys.Send // 异步模拟按键 (不阻塞 UI)

SendKeys.SendWait // 同步模拟按键 (会阻塞 UI 直到对方处理完消息后返回)

第二种方式：keybd_event

模拟按键：A

[DllImport("user32.dll", EntryPoint = "keybd_event", SetLastError = true)]
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);
}

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, 0, KEYEVENTF_KEYUP, 0);
}

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

模拟按键：A / 两次

[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);
}

模拟组合键：CTRL + A

如下方式可能会失效，所以最好采用上述两种方式

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

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

转自：https://www.cnblogs.com/smallfa/p/5741351.html