C++不定參數打印調試日誌或寫入文件

主要用到c語言的_va_args__宏
參考：http://www.cplusplus.com/reference/cstdarg/va_list/

#ifndef __LOGGER_H
#define __LOGGER_H

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#ifndef LOG_TYPE
#define LOG_TYPE
//日誌類型
enum	LogType
{
    InfoLog = 0,	//信息
    AlarmLog = 1,	//告警
    ErrLog = 2,	   //錯誤
    DebugLog = 3	//調試
};
#endif

#define WRITELOG tempWriteLog

#define DEBUG_LOG(level, para, fmt, ...)do {\
	if (level == DebugLog)WRITELOG(level,"%s "  "["para"_DEBUG] "  fmt" , %s:%d",__TIME__, ##__VA_ARGS__, __FUNCTION__, __LINE__);   \
	else WRITELOG(level, "[XQS_LOG]"  fmt, ##__VA_ARGS__);     \
}while(0)

#define XQS_LOG(level, para, fmt, ...)do {\
	WRITELOG(level, "%s "  "["para"] "  fmt" , %s:%d",__TIME__, ##__VA_ARGS__, __FUNCTION__, __LINE__);\
}while(0)


inline void writeLogFile(const char* filename, const char* log)
{
    FILE* stream = fopen("log.txt", "a");
    if (NULL == stream) {
        return;
    }
    fprintf(stream, "%s\n", log);
    fclose(stream);
    std::cout << "write file success!" << std::endl;
}

inline void tempWriteLog(int type, const char* format, ...)
{
    char buf[512] = { 0 };
    va_list ap;
    va_start(ap, format);
    vsprintf(buf, format, ap);
    va_end(ap);

    switch (type)
    {
    case InfoLog:
        printf("提示: %s\n", buf);
        break;

    case AlarmLog:
        printf("警告: %s\n", buf);
        break;

    case ErrLog:
        printf("錯誤: %s\n", buf);
        break;

    case DebugLog:
        printf("調試: %s\n", buf);
        break;

    default:
        printf("未知錯誤: %s\n", buf);
        break;
    }
    writeLogFile("log.txt", buf);
}



#endif