終於找到AUTOIT裡面鍵盤滑鼠的操作方式了，原來是這樣實現的。

程式碼參考如下：

#include <Windows.h>

int main(int argc, char* argv[])
{
    wprintf(L"Sending 'Win-D'\r\n");
    INPUT inputs[4];
    ZeroMemory(inputs, sizeof(inputs));

    inputs[0].type = INPUT_KEYBOARD;
    inputs[0].ki.wVk = VK_LWIN;
    
    inputs[1].type = INPUT_KEYBOARD;
    inputs[1].ki.wVk = 0x44;

    inputs[2].type = INPUT_KEYBOARD;
    inputs[2].ki.wVk = 0x44;
    inputs[2].ki.dwFlags = KEYEVENTF_KEYUP;

    inputs[3].type = INPUT_KEYBOARD;
    inputs[3].ki.wVk = VK_LWIN;
    inputs[3].ki.dwFlags = KEYEVENTF_KEYUP;

    UINT uSent = SendInput(ARRAYSIZE(inputs), inputs, sizeof(INPUT));
    if (uSent != ARRAYSIZE(inputs))
    {
        wprintf(L"SendInput failed: 0x%x\n", HRESULT_FROM_WIN32(GetLastError()));
    }
	getchar();
	return 0;
}