c#模拟键盘输入到指定位置

如果你想将模拟键盘输入发送到指定的位置，可以使用Windows API函数`SetForegroundWindow`和`SendInput`。以下是一个示例代码，它将模拟按下"Hello World"键，并将其发送到指定的文本框中：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

// 设置前台窗口并模拟键盘输入
[DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);

[DllImport("user32.dll")]
private static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

private const int INPUT_KEYBOARD = 1;
private const uint KEYEVENTF_EXTENDEDKEY = 0x0001;
private const uint KEYEVENTF_KEYUP = 0x0002;

[StructLayout(LayoutKind.Sequential)]
private struct INPUT
{
    public int type;
    public INPUTUNION union;
}

[StructLayout(LayoutKind.Explicit)]
private struct INPUTUNION
{
    [FieldOffset(0)]
    public KEYBDINPUT keyboardInput;
}

[StructLayout(LayoutKind.Sequential)]
private struct KEYBDINPUT
{
    public ushort wVk;
    public ushort wScan;
    public uint dwFlags;
    public uint time;
    public IntPtr dwExtraInfo;
}

// 获取窗口句柄
Process process = Process.GetProcessesByName("YourProcessName")[0];
IntPtr hwnd = process.MainWindowHandle;

// 设置前台窗口
SetForegroundWindow(hwnd);

// 模拟键盘输入
string text = "Hello World";
foreach (char c in text)
{
    INPUT[] inputs = new INPUT[2];
    inputs[0].type = INPUT_KEYBOARD;
    inputs[0].union.keyboardInput.wVk = 0;
    inputs[0].union.keyboardInput.wScan = (ushort)c;
    inputs[0].union.keyboardInput.dwFlags = KEYEVENTF_UNICODE;
    inputs[0].union.keyboardInput.time = 0;
    inputs[0].union.keyboardInput.dwExtraInfo = IntPtr.Zero;

    inputs[1].type = INPUT_KEYBOARD;
    inputs[1].union.keyboardInput.wVk = 0;
    inputs[1].union.keyboardInput.wScan = (ushort)c;
    inputs[1].union.keyboardInput.dwFlags = KEYEVENTF_UNICODE | KEYEVENTF_KEYUP;
    inputs[1].union.keyboardInput.time = 0;
    inputs[1].union.keyboardInput.dwExtraInfo = IntPtr.Zero;

    SendInput(2, inputs, Marshal.SizeOf(typeof(INPUT)));
}

在代码中，我们首先使用`GetProcessesByName`函数获取指定进程的句柄，然后使用`SetForegroundWindow`函数将其设置为前台窗口。接下来，我们使用`SendInput`函数模拟键盘输入，将每个字符一个接一个地发送到指定的文本框中。你可以根据需要修改代码以适应你的应用程序。