介绍：

　　该程序本意是为了在彩六里打中文用的，现整理出来供大家复制粘贴。（源程序已开源至GitHub - 彩六中文输入）

　　主要使用SendInput函数，与c语言中用法一致。（部分代码来自网络）

命名空间部分

using static System.Threading.Thread;
using System.Runtime.InteropServices;

结构体和函数声明部分

[StructLayout(LayoutKind.Explicit)]
public struct INPUT
{
[FieldOffset(0)]
public int type;
[FieldOffset(4)]
public KEYBDINPUT ki;
[FieldOffset(4)]
public MOUSEINPUT mi;
[FieldOffset(4)]
public HARDWAREINPUT hi;
}
public struct MOUSEINPUT
{
public int dx;
public int dy;
public int mouseData;
public int dwFlags;
public int time;
public IntPtr dwExtraInfo;
}
public struct KEYBDINPUT
{
public short wVk;
public short wScan;
public int dwFlags;
public int time;
public IntPtr dwExtraInfo;
}
public struct HARDWAREINPUT
{
public int uMsg;
public short wParamL;
public short wParamH;
}

    \[DllImport("user32")\]  
    public static extern uint SendInput(uint nInputs, INPUT\[\] pInputs, int cbSize);

自定义函数封装部分

public void SimulateInputString(char c)
{
INPUT[] input = new INPUT[2];

        input\[0\].type = 1;  
        input\[0\].ki.wVk = 0;//dwFlags 为KEYEVENTF\_UNICODE 即4时，wVk必须为0  
        input\[0\].ki.wScan = (short)c;  
        input\[0\].ki.dwFlags = 4;//输入UNICODE字符  
        input\[0\].ki.time = 0;  
        input\[0\].ki.dwExtraInfo = IntPtr.Zero;  
        input\[1\].type = 1;  
        input\[1\].ki.wVk = 0;  
        input\[1\].ki.wScan = (short)c;  
        input\[1\].ki.dwFlags = 6;  
        input\[1\].ki.time = 0;  
        input\[1\].ki.dwExtraInfo = IntPtr.Zero;  
        SendInput(2u, input, Marshal.SizeOf((object)default(INPUT)));

    }

    public void SimulateInputKey(int key)  
    {  
        INPUT\[\] input = new INPUT\[1\];

        input\[0\].type = 1;//模拟键盘  
        input\[0\].ki.wVk = (short)key;  
        input\[0\].ki.dwFlags = 0;//按下  
        SendInput(1u, input, Marshal.SizeOf((object)default(INPUT)));  
        Sleep(50);

        input\[0\].type = 1;//模拟键盘  
        input\[0\].ki.wVk = (short)key;  
        input\[0\].ki.dwFlags = 2;//抬起  
        SendInput(1u, input, Marshal.SizeOf((object)default(INPUT)));  
        Sleep(50);  
    }

说明：

SimulateInputString为发送单个字符文本；

SimulateInputKey为模拟按键按下和抬起，参数key为虚拟键码；

关于键码的列表，可以查看微软文档：https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes