About WH_CBT hook - c++

Question

I'm trying to use SetWindowsHookEx to install WH_CBT hook on global to inject the DLL into other process. Now I have the inject.exe, ExampleWindow.exe, inject.dll, let me show you the code.
1.code piece of inject.exe
#include <windows.h>
int main()
{
HHOOK hhook = NULL;
HMODULE dll = LoadLibrary(_T("D:\\projects\\CppDemon\\Release\\HookDemoDll.dll"));
HOOKPROC pfn = (HOOKPROC)GetProcAddress(dll, "MyCBTProc");
if (pfn == NULL)
{
printf("can not get MyCBTProc,press any key to exit\n");
getchar();
return 0;
}
printf("press any key to continue hook\n");
getchar();
hhook = SetWindowsHookEx(WH_CBT, pfn, dll, 0);
if (NULL == hhook)
{
printf("%d\n", GetLastError());
}
printf("press any key to unhook\n");
getchar();
UnhookWindowsHookEx(hhook);
return 0;
}
2.code piece of inject.dll
#ifdef __cplusplus
extern "C"
{
#endif
extern "C" __declspec(dllexport) LRESULT MyCBTProc(_In_ int nCode, _In_ WPARAM wParam, _In_ LPARAM lParam);
#ifdef __cplusplus
}
#endif
LRESULT MyCBTProc(_In_ int nCode, _In_ WPARAM wParam, _In_ LPARAM lParam)
{
return CallNextHookEx(NULL, nCode, wParam, lParam);
}
BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
DWORD pid = 0;
TCHAR buffer[128] = { 0 };
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
pid = GetCurrentProcessId();
_stprintf_s(buffer, 128, _T("[+] PID = %d"), pid);
OutputDebugString(buffer);
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
The ExampleWindow.exe is a test case for inject when the named window is created.
When I run inject.exe and everything goes well, the inject.dll has been loaded and the the debug message is output correct, and the PCHUNTER(this is an ARK tool) can detect the WH_CBT message hook in module inject.exe. Then, I run the ExampleWindow.exe, there also can output the debug message.
After this action, I refresh the message hook windows in PCHUNTER ,the WH_CBT hook message has disappeared from the control, and the inject.dll not injected in the ExampleWindow.exe at all.THis is not my expect result.
I don't know how this happens. I hope someone can help me find the cause of this problem.