? log4cxx_0_9_7.patch
Index: include/log4cxx/nt/nteventlogappender.h
===================================================================
RCS file: /home/cvspublic/logging-log4cxx/include/log4cxx/nt/nteventlogappender.h,v
retrieving revision 1.10
diff -u -r1.10 nteventlogappender.h
--- include/log4cxx/nt/nteventlogappender.h	24 Apr 2004 06:55:02 -0000	1.10
+++ include/log4cxx/nt/nteventlogappender.h	23 Feb 2005 23:23:11 -0000
@@ -87,6 +87,7 @@
 			 * Add this source with appropriate configuration keys to the registry.
 			 */
 			void addRegistryInfo();
+			const String* getErrorString(LPTSTR lpszFunction);
 
 			// Data
 			String server;
Index: src/nteventlogappender.cpp
===================================================================
RCS file: /home/cvspublic/logging-log4cxx/src/nteventlogappender.cpp,v
retrieving revision 1.7
diff -u -r1.7 nteventlogappender.cpp
--- src/nteventlogappender.cpp	22 Apr 2004 21:21:33 -0000	1.7
+++ src/nteventlogappender.cpp	23 Feb 2005 17:24:14 -0000
@@ -158,7 +158,12 @@
 
 	addRegistryInfo();
 
-	hEventLog = ::RegisterEventSource(server.c_str(), source.c_str());
+	hEventLog = ::RegisterEventSource( (server.empty() ? NULL : server.c_str()), source.c_str());
+	if (hEventLog == NULL)
+	{
+		LogLog::error(_T("Cannot register NT EventLog -- server: '")+server+_T("' source: '")+source+_T("'"));
+		LogLog::error(getErrorString(_T("RegisterEventSource"))->c_str());
+	}
 }
 
 void NTEventLogAppender::append(const LoggingEventPtr& event)
@@ -187,8 +192,8 @@
 
 	if (!bSuccess)
 	{
-		DWORD dwError = ::GetLastError();
 		LogLog::error(_T("Cannot report event in NT EventLog."));
+		LogLog::error(getErrorString(_T("RegisterEventSource"))->c_str());
 	}
 }
 
@@ -284,4 +289,28 @@
 	return ret_val;
 }
 
+const String* NTEventLogAppender::getErrorString(LPTSTR lpszFunction) 
+{ 
+    TCHAR szBuf[80]; 
+    LPVOID lpMsgBuf;
+    DWORD dw = GetLastError(); 
+
+    FormatMessage(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
+        FORMAT_MESSAGE_FROM_SYSTEM,
+        NULL,
+        dw,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (LPTSTR) &lpMsgBuf,
+        0, NULL );
+
+    wsprintf(szBuf, 
+        "%s failed with error %d: %s", 
+        lpszFunction, dw, lpMsgBuf); 
+ 
+    LocalFree(lpMsgBuf);
+
+	return new String(szBuf);
+}
+
 #endif // WIN32