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// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the EVENTLOG_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// EVENTLOG_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifdef EVENTLOG_EXPORTS
#define EVENTLOG_API __declspec(dllexport)
#else
#define EVENTLOG_API __declspec(dllimport)
#endif

#define ERROR_NONE		0
#define ERROR_ERROR		1
#define ERROR_NOEVENT	-1

// This class is exported from the EventLog.dll
bool EVENTLOG_API	addEventSource(LPTSTR pszLogName, // Application log or a custom log
									LPTSTR pszSrcName, // event source name
									LPTSTR pszMsgDLL,  // path for message DLL
									DWORD  dwNum);      // number of categories

int EVENTLOG_API	reportEvent(LPSTR uncName,
								LPSTR pszSrcName, // event source name
								WORD eventType,
								DWORD dwEventID,   // event identifier
								WORD wCategory,    // event category
								WORD cInserts,     // count of insert strings
								LPCTSTR *szMsg,
								char *data);    // insert strings

----

#include "stdafx.h"
#include "EventLog.h"
#include "stdio.h"
#include "stdlib.h"
#include "C:Program FilesMicrosoft Visual Studio .NET 2003Common7ToolsBinMessage.h"

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
    return TRUE;
}

// This is an example of an exported variable
bool addEventSource(LPTSTR pszLogName, // Application log or a custom log
					LPTSTR pszSrcName, // event source name
					LPTSTR pszMsgDLL,  // path for message DLL
					DWORD  dwNum)      // number of categories
{
HKEY hk; 
DWORD dwData; 
TCHAR szBuf[MAX_PATH]; 

   // Create the event source as a subkey of the log. 
 
   wsprintf(szBuf, 
      "SYSTEM\CurrentControlSet\Services\EventLog\%s\%s",
      pszLogName, pszSrcName); 
 
   if (RegCreateKey(HKEY_LOCAL_MACHINE, szBuf, &hk)) 
   {
      return false;
   }
 
   // Set the name of the message file. 
 
   if (RegSetValueEx(hk,              // subkey handle 
           "EventMessageFile",        // value name 
           0,                         // must be zero 
           REG_EXPAND_SZ,             // value type 
           (LPBYTE) pszMsgDLL,        // pointer to value data 
           (DWORD) lstrlen(szBuf)+1)) // length of value data 
   {
      return false;
   }
 
   // Set the supported event types. 
 
   dwData = EVENTLOG_ERROR_TYPE | EVENTLOG_WARNING_TYPE | 
			EVENTLOG_INFORMATION_TYPE; 
 
   if (RegSetValueEx(hk,      // subkey handle 
           "TypesSupported",  // value name 
           0,                 // must be zero 
           REG_DWORD,         // value type 
           (LPBYTE) &dwData,  // pointer to value data 
           sizeof(DWORD)))    // length of value data 
   {
      return false;
   }
 
   // Set the category message file and number of categories.

   if (RegSetValueEx(hk,              // subkey handle 
           "CategoryMessageFile",     // value name 
           0,                         // must be zero 
           REG_EXPAND_SZ,             // value type 
           (LPBYTE) pszMsgDLL,        // pointer to value data 
           (DWORD) lstrlen(szBuf)+1)) // length of value data 
   {
      return false;
   }
 
   if (RegSetValueEx(hk,      // subkey handle 
           "CategoryCount",   // value name 
           0,                 // must be zero 
           REG_DWORD,         // value type 
           (LPBYTE) &dwNum,   // pointer to value data 
           sizeof(DWORD)))    // length of value data 
   {
      return false;
   }

   RegCloseKey(hk); 
   return true;
}

int reportEvent(LPSTR uncName,
				 LPSTR pszSrcName, // event source name
				 WORD eventType,
				 DWORD dwEventID,   // event identifier
				 WORD wCategory,    // event category
				 WORD cInserts,     // count of insert strings
				 LPCTSTR *szMsg,
				 char *data)    // insert strings

{
HANDLE handle; 

    // Get a handle to the event log.
 
    if ((handle = RegisterEventSource(uncName,pszSrcName))!=NULL)
	{
		// Report the event.
		if (!ReportEvent(handle,           // event log handle 
							eventType,  // event type 
							wCategory,            // event category  
							dwEventID,            // event identifier 
							NULL,                 // no user security identifier 
							cInserts,			  // number of substitution strings 
							(data ? strlen(data) : 0),                    // no data 
							szMsg,                // pointer to strings 
							(data ? (void *) data : NULL)))                // no data 
		{
			return (ERROR_ERROR);
		}

		DeregisterEventSource(handle); 
		return (ERROR_NONE);
    } 
    
	{
	char t[256];

		sprintf(t,"[%d]",GetLastError());
		MessageBox(NULL,t,"*",MB_OK);
	}
    return (ERROR_NOEVENT);
}