最后还是子类化搞定了

HHOOK g_hhook = NULL;

HINSTANCE m_hInst;

WNDPROC OldProc= NULL; //原窗口过程

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);

LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);

BOOL APIENTRY DllMain( HANDLE hModule, //DLL入口

DWORD ul_reason_for_call,

LPVOID lpReserved

)

{

m_hInst=(HINSTANCE)hModule;

return TRUE;

};

extern "C" __declspec(dllexport) HHOOK _stdcall InstallHook(HWND hHwnd)

{

g_hhook = ::SetWindowsHookEx(WH_CALLWNDPROCRET, (HOOKPROC)KeyboardProc, m_hInst, ::GetWindowThreadProcessId(hHwnd,NULL));

if (g_hhook != NULL)

return g_hhook;

return 0;

}

extern "C" __declspec(dllexport) BOOL _stdcall UninstallHook(HHOOK hHook)

{

return ::UnhookWindowsHookEx(hHook);

}

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)

{

if(nCode == HC_ACTION)

{

//PCWPSTRUCT p=(PCWPSTRUCT)lParam;

CWPRETSTRUCT *p=(CWPRETSTRUCT*)lParam;

if(p->message == WM_USER+1)

{

HWND retNum;

char tt[10];

retNum=(HWND)p->wParam;

ltoa((DWORD)retNum,tt,10);

::MessageBox(0,tt,"提示",0);

OldProc=(WNDPROC)GetWindowLong(retNum,GWL_WNDPROC);

if (SetWindowLong(retNum,GWL_WNDPROC,(long)WindowProc)==0) //子类化

{

::MessageBox(0,"安装失败","提示",0);

}

//return 77586;

}

//::MessageBox(0,"hgggg","提示",0);

}

return ::CallNextHookEx(g_hhook, nCode, wParam ,lParam);

}

LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)

{

switch(uMsg)

{

case WM_DESTROY://接收到销毁窗口消息时取消子类化

if (OldProc != NULL)

{

SetWindowLong(hwnd,GWL_WNDPROC,(long)OldProc);

OldProc=NULL;

}

case WM_USER + 2:

::MessageBox(0,"收到WM_USER+2消息","提示",0);

return 7758;

}

return CallWindowProc(OldProc,hwnd,uMsg,wParam,lParam);

}