Question

我编写了一个在后台线程中挂钩低级鼠标的代码。我如何正确设置HOOKPROC m_Callback以便在同一个线程中调用它？谢谢！

std::mutex m;
std::condition_variable cv;
bool tk_worker_kill = false;

LRESULT CALLBACK m_Callback(int nCode, WPARAM wparam, LPARAM lparam)
{
    // do something
    return CallNextHookEx(_m_hook, nCode, wparam, lparam);
}

// this function is called by a background thread
void set_Hook()
{
    std::unique_lock<std::mutex> lk(m);
    _m_hook = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC)m_Callback, NULL, 0);

    cv.wait(lk, []{return tk_worker_kill; });
    lk.unlock();
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int iCmdShow)
{
    std::thread worker(set_Hook);
}

Answer 1

您需要在后台线程中使用消息循环：

在安装它的线程的上下文中调用此钩子。通过向安装了该安装的线程发送消息来进行调用钩。因此，安装钩子的线程必须有一个消息循环。

来源： https://msdn.microsoft.com/en-us/library/windows/desktop/ms644986(v=vs.85).aspx

如何在后台线程上正确设置全局鼠标挂钩？

1 个答案: