LRESULT CALLBACK WndProc(HWND hWnd,UINT message,UINT wParam,LONG lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    if(!RegisterHotKey(hWnd,1001,MOD_CONTROL,VK_A))
    {
        return FALSE;
    }
    switch(message)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        UnregisterHotKey(hWnd,1001);
        break;
    case WM_HOTKEY:
        {
            switch(wParam)
            {
            case 1001:
                MessageBox(hWnd,"ss","ss",MB_OK);
                break;
            }
            break;
        }
    case WM_PAINT:
        hdc=BeginPaint(hWnd,&ps);
        EndPaint(hWnd,&ps);
        break;
    default:
        return DefWindowProc(hWnd,message,wParam,lParam);
    }
}

注册热键，然后利用热键发送组合键命令