WH_JOURNALRECORD钩子无法正常使用！

[一名程序员]

我做了一个WH_JOURNALRECORD的钩子。是放在一个dll中的。一运行链接此dll的应用程序，程序就死掉。后来在msdn上看到这样一句话：
[Quote=msdn2001]Unlike most other global hook procedures, the JournalRecordProc and JournalPlaybackProc hook procedures are always called in the context of the thread that set the hook.[/Quote]
疑是我调用该钩子的上下文不对。但又搞不清到底怎么回事？
我的主要代码如下：

// HookDll.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "HookDll.h"
#include "stdio.h"
			0
struct {
	HHOOK m_hHook_WH_JOURNALRECORD;
	HANDLE m_hInstance;
}g_data;

FILE *g_logFile_WH_JOURNALRECORD;

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
			g_data.m_hInstance = hModule;
			g_logFile_WH_JOURNALRECORD = fopen("log_WH_JOURNALRECORD.txt", "w+t");
			break;
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			fclose(g_logFile_WH_JOURNALRECORD);
			break;
    }
    return TRUE;
}


// This is an example of an exported variable
HOOKDLL_API int nHookDll=0;

// This is an example of an exported function.
HOOKDLL_API int fnHookDll(void)
{
	return 42;
}

// This is the constructor of a class that has been exported.
// see HookDll.h for the class definition
CHookDll::CHookDll()
{ 
	return; 
}
LRESULT HOOKDLL_API CALLBACK MyHookProc_WH_JOURNALRECORD(
  int nCode, 
  WPARAM wParam, 
  LPARAM lParam
);
void SetHook()
{
	g_data.m_hHook_WH_JOURNALRECORD = SetWindowsHookEx(WH_JOURNALRECORD,
		MyHookProc_WH_JOURNALRECORD, 
		(HINSTANCE)g_data.m_hInstance,
		0);
}

void UnSetHook()
{
	if ( g_data.m_hHook_WH_JOURNALRECORD )
	{
		UnhookWindowsHookEx(g_data.m_hHook_WH_JOURNALRECORD); 
	}
}

LRESULT HOOKDLL_API CALLBACK MyHookProc_WH_JOURNALRECORD(
  int nCode, 
  WPARAM wParam, 
  LPARAM lParam
)
{
	//TRACE("HOOK!%d %d %d\n",nCode, wParam, lParam);
	if (nCode == HC_ACTION )
	{
		
		PEVENTMSG pEventMsg = (PEVENTMSG)lParam;
		char buf[50] = "";
		sprintf(buf,"%p %u %u %u %d\n",
			pEventMsg->hwnd,
			pEventMsg->message,
			pEventMsg->paramH,
			pEventMsg->paramL,
			pEventMsg->time);
		
		WM_PAINT;
		fwrite(buf,sizeof(char),strlen(buf),g_logFile_WH_JOURNALRECORD);
	}
	return CallNextHookEx(g_data.m_hHook_WH_JOURNALRECORD, nCode, 
        wParam, lParam); 
}

欢迎同行批评指正！