Log打印技巧(C語言實現)

在實際開發中我們經常要通過打印Log來調試程序，經常會用到打印函數，這裏我書寫了個宏，做到有選擇的打印log。發話不多說，直接貼代碼，希望對各位同仁有所啓發。

/*
File  : log.c
Breif : Define a macro to optition print log
Date  : 2016-12-16
Author: Andy
*/

#include <stdio.h>

/* Define Log print macro */
#define MyLog(DebugLevel, format, ...)   \
        do{  \
            switch (DebugLevel)  \
            {  \
            case 1:  \
                printf(format, ##__VA_ARGS__);  \
                break;  \
            case 2: \
                printf("Function: "__FUNCTION__", Line: %d, ---> "format"", __LINE__, ##__VA_ARGS__); \
                break;  \
            case 3:  \
                printf("File: "__FILE__", Function: "__FUNCTION__", Line: %d, ---> "format"", __LINE__, ##__VA_ARGS__); \
                break; \
            default:   \
                break;  \
            }   \
        }while(0)

int main(void)
{
    MyLog(1, "Simple Log print!\r\n");
    MyLog(2, "Satndard Log display!\r\n");
    MyLog(3, "Detail Log view!\r\n");

    MyLog(1, "If debug level is not equal 1,2 or 3 that log is invisible, such as next line :\r\n");
    MyLog(6, "I am invisible log!\r\n");
    MyLog(1, "Now, I think you have understood how to use MyLog macro.\r\n");

    return 0;
}

運行的截圖如下：