在 WinApi 中捕获 window 的关闭事件

Question

基本上，我想在用户单击 X（关闭）特定 window 后执行某些操作。

这是我的方法：

HWND handle;

LRESULT WINAPI procedure(int code, WPARAM wParam, LPARAM, lParam){
    CWPSTRUCT* j = (CWPSTRUCT*) lParam;
    WPSTRUCT* w = (CWPSTRUCT*) wParam;

    if(w->message == WM_SYSCOMMAND && j->message == SC_CLOSE){
        //do something
    }
}

Void doSomething(){
    HINSTANCE hDLL = LoadLibrary("User32.dll");
    HWND WINAPI FindWindow(_In_opt_ LPCTSTR lpClassName, _In_opt_ LPCTSTR lpWindowName);
    HHOOK WINAPI SetWindowsHookEx(_In_ int idHook, _In_ HOOKPROC lpfn, _In_ HINSTANCE hMod, _In_ DWORD dwThreadId);

    handle = FindWindow("Notepad", NULL) //for example
    DWORD threadId = GetWindowThreadProcessId(handle, NULL);
    HHOOK hhook = SetWindowsHookEx(WH_CALLWNDPROC, (HOOKPROC) &procedure, (HINSTANCE) NULL, threadId);
    return;
}

这不起作用，因为应用程序永远不会进入 过程()。

编辑：根据-RbMm的建议，我从[=21]找到了threadId =]句柄。谢谢。

 DWORD threadId = GetWindowThreadProcessId(handle, NULL);
 HHOOK hhook = SetWindowsHookEx(WH_CALLWNDPROC, (HOOKPROC) &procedure, (HINSTANCE) NULL, threadId);

Answer 1

您必须在 hook 之后发送消息，而您的示例不会这样做。

其他应用程序中线程的挂钩程序必须在 .DLL 中：

A thread-specific hook procedure is called only in the context of the associated thread. If an application installs a hook procedure for one of its own threads, the hook procedure can be in either the same module as the rest of the application's code or in a DLL. If the application installs a hook procedure for a thread of a different application, the procedure must be in a DLL.

WH_CBT 或 WH_SHELL 挂钩可能更适合您要执行的操作。

或者您可以尝试用 event hook 捕捉 EVENT_OBJECT_DESTROY。事件挂钩明确支持上下文挂钩。

在 WinApi 中捕获 window 的关闭事件

Catching closing event of a window in WinApi

windows

events

hook

winapi

user32