全局挂接到MFC对象创建

Question

我有一个从CWnd继承的X类，我想从应用程序域外部连接到X Create，即程序A必须监视程序B中的X对象实例。有什么办法可以做到这一点？

Answer 1

1. You can't monitor creation of an object of X (X ctor X::X() ).

2. You also can't monitor calls to X::Create .

3. But there might be a solution for you:

Since X::Create calls CWnd::Create and this creates a window, you can hook up to window creation and might be able to detect when a X's window is created. But you will only be able to recognize this if there is something special about the windows created like a known window class used to create them. If this is the case, then:

You already got the right answer in your previous question Hooking window creation in an MFC program .

You can use SetWindowsHookEx (WH_CBT, lpfn, hMod, dwThreadId) to get notified when windows are created.

Some things to keep in mind:

• The hook function must reside in a DLL, not in the process that calls SetWindowsHookEx . This is because windows will load/inject your DLL into every process that it monitors for window creation.
• If you want to monitor 32 bit processes, you need a 32 bit process and DLL.
• If you want to monitor 64 bit processes, you need a 64 bit process and DLL.
• If you want to monitor 32 bit and 64 bit processes, you need a 32 bit and a 64 bit process and DLL.
• Your process must be a windows application, not a console application, and it must keep pumping messages.
• If you know the thread ID, you can pass that to SetWindowsHookEx. If not, you can pass 0 and you will get notified for all windows on the same desktop.
• Be cautious with what you do in the hook function and don't forget to call CallNextHookEx .
• You will get notified for different events on different windows and you will have to filter out for nCode== HCBT_CREATEWND and the window classes (or whatever) that you are interested in.