大家请看过来，一个简单的鼠标钩子问题！

[divaly]

源代码：
#define DLLEXPORT __declspec(dllexport)

#pragma data_seg("mydata")
HHOOK GW_MouseHook = NULL; // Mouse Hook Handle
HINSTANCE GW_Instance = NULL; // DLL Instance
#pragma data_seg()

HWND pWnd = NULL;

static AFX_EXTENSION_MODULE GWEngineDLL = { NULL, NULL };

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
UNREFERENCED_PARAMETER(lpReserved);

if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("GWENGINE.DLL Initializing!\n");

if (!AfxInitExtensionModule(GWEngineDLL, hInstance))
return 0;

new CDynLinkLibrary(GWEngineDLL);
GW_Instance = hInstance;
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("GWENGINE.DLL Terminating!\n");
AfxTermExtensionModule(GWEngineDLL);
}
return 1;
}

//---------------------- Mouse Hook Callback funtion ---------------------------

//钩子函数的实现：
LRESULT CALLBACK MouseProc(int nCode,WPARAM wparam,LPARAM lparam)
{
SendMessage(pWnd,WM_USER + 101,0,0);
return CallNextHookEx(GW_MouseHook,nCode,wparam,lparam);
}

//--------------------------- Export function ---------------------
//Install MouseHook
DLLEXPORT BOOL WINAPI EnableGW(HWND hWnd)
{
if(GW_MouseHook == NULL)
{
GW_MouseHook = SetWindowsHookEx(WH_MOUSE,(HOOKPROC)MouseProc,GW_Instance,0);

if(GW_MouseHook == NULL)
return FALSE;

pWnd = hWnd;
}
return TRUE;
}

//Uninstall MouseHook
DLLEXPORT BOOL WINAPI DisableGW()
{
if(GW_MouseHook != NULL)
{
if(!UnhookWindowsHookEx(GW_MouseHook))
return FALSE;
GW_MouseHook = NULL;
}
return TRUE;
}

请大家看上面的源代码，目的是创建一个全局鼠标钩子，编译完后，调用EnableGW()后，用SPY看他的消息，发现当鼠标在调用者的窗口区域里，是起作用了，会收到WM_USER + 101，可是当鼠标移出调用者的窗口区域后，这个所谓的全局鼠标钩子一点都钩不上了，接收不到任何消息？？

请问为什么？？难道我上面的代码有错吗？？十万感激

[殇迪]

设置共享段 并 赋值

[daveice]

mark

[vcmute]

mydata 申明共享了么？

[divaly]

mydata已经在DEF文件申明mydata READ WRITE SHARED

[divaly]

问题已解决，不好意思，原来应该把HWND pWnd = NULL;放到mydata里面去

[DentistryDoctor]

就是pWnd的问题。