win32-如何管理鼠标挂钩线程

我已经成功地让我的低级鼠标挂钩代码工作,但是我观察到的一些行为我不太理解。如果我生成一个安装鼠标挂钩的线程,一切都会正常工作。当我不再需要它运行时,我让线程在我退出程序时自动销毁,我想我可以很容易地明确地终止线程。但是这让我很不安,因为我不会打电话来的 UnhookWindowsHookEx 释放鼠标挂钩资源。

所以我试着在我的测试程序中反转逻辑。我尝试生成一个睡眠一点的线程,然后写入一个全局变量。然后我从主线程调用钩子安装例程。这里有一个循环,它检查全局变量,并在适当的时候退出循环。然后它就可以自己清理了。相关代码如下:

static int willQuit = 0;
unsigned WINAPI MouseProcessingProc (void *param) {
 try { // will catch exceptions and not propagate them
  HHOOK mousehook = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc,
    NULL, 0);
  if (mousehook == NULL) printf("Mousehook error %u\n",GetLastError());

  while(true) {
   MSG msg;
   if (GetMessage(&msg,0,0,0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
   }
   if (willQuit) { printf("willQuit no longer 0!\n"); break; }
   printf("Looped\n");
  }
  willQuit = 0;
  UnhookWindowsHookEx(mousehook);

  printf("Procedure completed without exceptional events.\n");
 } catch (const std::string& s) {
  printf("String exception: %s\n", s.c_str());
 } catch (int i) {
  printf("Int exception: %d\n", i);
 } catch (...) {
  printf("Unknown default exception!\n");
 }
 printf("Exiting thread execution.\n");
 return 0;
}

void spawn() {
 printf("Spawning Mouse thread\n");
 _beginthreadex(NULL,0,MouseProcessingThreadProc,NULL,0,0);
}

void run() {
 printf("Running Mouse routine\n");
 MouseProcessingThreadProc(0);
}

void stop() {
 printf("Stopping Mouse routine\n");
 willQuit = 1;
}

unsigned WINAPI threadproc(void *param) {
    Sleep(500);
    printf("Spawned thread says 3");
    Sleep(500);
    printf("2");
    Sleep(500);
    printf("1\n");
    Sleep(500);
    printf("Spawned thread calls stop now -->\n");
    stop();
}

int main() {
    _beginthreadex(NULL,0,threadproc,NULL,0,0); // waiter and stopper thread
    run(); // become the mousehook thread
    printf("Completed\n");
    return 0;
}

现在发生的是我的小消息轮询循环 while 循环)从不从 GetMessage 打电话,这样它就永远无法到达检查点 willQuit . 我已经用printf和gdb验证了这一点。为什么 获取消息 不回来?有没有更好的方法来设置我的鼠标钩线?或者我是想做一些不该做的事情?

谢谢你的阅读。