diff --git a/src/cppcommon/Makefile b/src/cppcommon/Makefile
index 0efc89e..422f612 100644
--- a/src/cppcommon/Makefile
+++ b/src/cppcommon/Makefile
@@ -28,14 +28,14 @@ file_functs.ut: file_functs.cpp file_functs.h
 io_functs.test: io_functs.cpp io_functs.h
 	g++ -o $@ $< -DTEST_IO_FUNCTS
 str_functs.ut: str_functs.cpp str_functs.h
-	g++ -o $@ $< -DTEST_STR_FUNCTS -liconv
+	g++ -o $@ $< -DTEST_STR_FUNCTS 
 encoding.ut: encoding.cpp str_functs.cpp str_functs.h encoding.h
-	g++ -o $@ encoding.cpp str_functs.cpp -DENCODING_UT -liconv
+	g++ -o $@ encoding.cpp str_functs.cpp -DENCODING_UT 
 vec_functs.test: vec_functs.cpp vec_functs.h vec_functs.tcc
 	g++ -o $@ $< -DTEST_VEC_FUNCTS
 
 logger.ut: logger.cpp logger.h file_functs.cpp file_functs.h str_functs.cpp str_functs.h
-	g++ -o $@ $< file_functs.cpp str_functs.cpp -DLOGGER_UT -liconv
+	g++ -o $@ $< file_functs.cpp str_functs.cpp -DLOGGER_UT 
 config.ut: config.cpp config.h 
 	g++ -o $@ $< -DCONFIG_UT $(CMLIB)
 
diff --git a/src/cppcommon/logger.cpp b/src/cppcommon/logger.cpp
index 9467800..4b1afa7 100644
--- a/src/cppcommon/logger.cpp
+++ b/src/cppcommon/logger.cpp
@@ -5,7 +5,7 @@
 #include "logger.h"
 namespace CPPCOMMON
 {
-	const char * Logger::_logFormat =  "%s [File:%s] [Line:%d] [%s] Msg:%s";
+	const char * Logger::_logFormat =  "%s [File:%s] [Line:%d] [%s] Msg:%s\n";
 	const char * Logger::_timeFormat = "%Y-%m-%d %H:%M:%S";
 	Logger::Logger()
 	{
@@ -21,7 +21,7 @@ namespace CPPCOMMON
 	{
 	}
 
-	bool Logger::Logging(uint level, const string& msg, const char* fileName, int lineNo)
+	bool Logger::Logging(uint level, const char * msg, const char* fileName, int lineNo)
 	{
 		if(level > LL_FATAL)
 		{
@@ -32,16 +32,17 @@ namespace CPPCOMMON
 		size_t ret = strftime(_cStrBuf, sizeof(_cStrBuf), _timeFormat, localtime(&_timeNow));
 		if(0 == ret)
 		{
-			cerr<<"strftime failed."<<endl;
+			fprintf(stderr, "stftime failed.\n");
 			return false;
 		}
 		if(level >= LL_WARN)
 		{
-			cerr<<string_format(_logFormat, _cStrBuf, fileName, lineNo, _logLevel[level], msg.c_str())<<endl;
+			fprintf(stderr, _logFormat, _cStrBuf, fileName, lineNo, _logLevel[level], msg);
 		}
 		else
 		{
-			cout<<string_format(_logFormat, _cStrBuf, fileName, lineNo, _logLevel[level], msg.c_str())<<endl;
+			fprintf(stdout, _logFormat, _cStrBuf, fileName, lineNo, _logLevel[level], msg);
+			fflush(stdout);
 		}
 		return true;
 	}
diff --git a/src/cppcommon/logger.h b/src/cppcommon/logger.h
index cf95c8e..94d4b25 100644
--- a/src/cppcommon/logger.h
+++ b/src/cppcommon/logger.h
@@ -40,7 +40,7 @@ namespace CPPCOMMON
 			Logger();
 			~Logger();
 		public:
-			bool Logging(uint level, const string& msg, const char* fileName, int lineNo);
+			bool Logging(uint level, const char * msg, const char* fileName, int lineNo);
 		private:
 			char _cStrBuf[CSTR_BUFFER_SIZE];
 			const char * _logLevel[LEVEL_ARRAY_SIZE];