多少年了，现成的定义系统热键的API，我却不知道 RegisterHotKey() 与 UnregisterHotKey()

多少年了，尽然不知道定义一个系统热键是如此的简单：RegisterHotKey() 与 UnregisterHotKey()

char keys[3] = {'H', 'J', 'G'}; //可选的三个键

int n;
for(n = 0; n < 3; n++)
{
    //定义一个系统范围的热键
    //若函数调用成功，返回一个非0值。若函数调用失败，则返回值为0。
    //参考: https://bbs.csdn.net/topics/392280021?page=1 与 https://ask.csdn.net/questions/273724?sort=id
    int status = RegisterHotKey(hwnd, id_b_location_and_color_static, MOD_CONTROL | MOD_ALT, keys[n]);
    printf("status:%d
", status);
    if(status)
    {
        char szTip[32];
        sprintf(szTip, "快捷键: Ctrl + Alt + %c", keys[n] + 32); // + 32, 表示将大写字母转换成小写字母

        setToolTip(hwnd_b_location_and_color_static, szTip, hInstance); //设置提示

        break;
    }
    else
    {
        //printf("系统热键定义失败, 可能与其他软件冲突。
");
    }
}

接收系统热键消息：

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_HOTKEY: //按下【系统热键】
        {
            //参考: https://bbs.csdn.net/topics/392280021?page=1 与 https://ask.csdn.net/questions/273724?sort=id

#define _use_wParam //使用 wParam 来判断: https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-hotkey

#ifdef _use_wParam

            //printf("按下系统热键
");

            if(wParam == id_b_location_and_color_static)
            {
                //释放调用线程先前登记的热键
                //若函数调用成功，返回值不为0。若函数调用失败，返回值为0
                //int status = UnregisterHotKey(hwnd, id_b_location_and_color_static);
                //printf("status2:%d
", status);

                if(IsWindowEnabled(hwnd_b_location_and_color_static)) //当【按钮】可用状态时
                {
                    SendMessage(hwnd, WM_COMMAND, MAKELPARAM(id_b_location_and_color_static, 0), 0); //触发事件
                }
            }

#else
            UINT fuModifiers = (UINT)LOWORD(lParam);
            UINT uVirtKey = (UINT)HIWORD(lParam);

            switch (fuModifiers)
            {
                case MOD_CONTROL | MOD_ALT:
                {
                    switch (uVirtKey)
                    {
                        case 'H':  // Ctrl + Alt + h
                        {
                            //printf("Ctrl + Alt + h
");

                            //释放调用线程先前登记的热键
                            //若函数调用成功，返回值不为0。若函数调用失败，返回值为0
                            //int status = UnregisterHotKey(hwnd, id_b_location_and_color_static);
                            //printf("status2:%d
", status);

                            if(IsWindowEnabled(hwnd_b_location_and_color_static)) //当【按钮】可用状态时
                            {
                                SendMessage(hwnd, WM_COMMAND, MAKELPARAM(id_b_location_and_color_static, 0), 0); //触发事件
                            }

                            break;
                        }
                    }

                    break;
                }
            }
#endif // _use_wParam

            break;
        }