总结几种log打印printf函数的宏定义

最新推荐文章于 2024-12-10 21:49:02 发布

转载最新推荐文章于 2024-12-10 21:49:02 发布 · 1.3w 阅读

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#cmd #android #function #file #list

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本文介绍了一种在C语言中使用宏定义实现灵活调试输出的方法，并展示了如何自动记录函数名、文件名及行号来增强日志信息的实用性。

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http://blog.chinaunix.net/u1/38994/showart_1168773.html

#include <stdio.h> #define lU_DEBUG_PREFIX "##########" #define LU_DEBUG_CMD 0x01 #define LU_DEBUG_DATA 0x02 #define LU_DEBUG_ERROR 0x04 #define LU_PRINTF_cmd(msg...) do{if(lu_debugs & LU_DEBUG_CMD)printf(lU_DEBUG_PREFIX msg);}while(0) #define LU_PRINTF_data(msg...) do{if(lu_debugs & LU_DEBUG_DATA)printf(lU_DEBUG_PREFIX msg);}while(0) #define LU_PRINTF_error(msg...) do{if(lu_debugs & LU_DEBUG_ERROR)printf(lU_DEBUG_PREFIX msg);}while(0) #define lu_printf(level, msg...) LU_PRINTF_##level(msg) #define lu_printf2(...) printf(__VA_ARGS__) #define lu_printf3(...) lu_printf(__VA_ARGS__) static int lu_printf4_format(int prio, const char *fmt, ...); #define lu_printf4(prio, fmt...) lu_printf4_format(prio, fmt) int lu_debugs; int main(int argc, char *argv[]) { lu_debugs |= LU_DEBUG_CMD | LU_DEBUG_DATA | LU_DEBUG_ERROR; printf("lu_debugs = %p\n", lu_debugs); lu_printf(cmd,"this is cmd\n"); lu_printf(data,"this is data\n"); lu_printf(error,"this is error\n"); lu_debugs &= ~(LU_DEBUG_CMD | LU_DEBUG_DATA); printf("lu_debugs = %p\n", lu_debugs); lu_printf(cmd,"this is cmd\n"); lu_printf(data,"this is data\n"); lu_printf(error,"this is error\n"); lu_printf2("aa%d,%s,%dbbbbb\n", 20, "eeeeeee", 100); lu_debugs |= LU_DEBUG_CMD | LU_DEBUG_DATA | LU_DEBUG_ERROR; printf("lu_debugs = %p\n", lu_debugs); lu_printf3(cmd,"this is cmd \n"); lu_printf3(data,"this is data\n"); lu_printf3(error,"this is error\n"); lu_printf4(0,"luther %s ,%d ,%d\n", "gliethttp", 1, 2); return 0; } #include <stdarg.h> static int lu_printf4_format(int prio, const char *fmt, ...) { #define LOG_BUF_SIZE (4096) va_list ap; char buf[LOG_BUF_SIZE]; va_start(ap, fmt); vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); va_end(ap); printf("<%d>: %s", prio, buf); printf("------------------------\n"); printf(buf); } #define ENTER() LOGD("enter into %s", __FUNCTION__) #define LOGD(...) ((void)LOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__)) #define LOG(priority, tag, ...) \ LOG_PRI(ANDROID_##priority, tag, __VA_ARGS__) #define LOG_PRI(priority, tag, ...) \ android_printLog(priority, tag, __VA_ARGS__) #define android_printLog(prio, tag, fmt...) \ __android_log_print(prio, tag, fmt)

http://www.linuxsir.org/bbs/showthread.php?t=302451

这里有篇不错的文章，[经验分享]程序日志中自动记录所在函数名、文件名、行号

比上面的要好多了：

#include <stdio.h> #define LOG_DEBUG "DEBUG" #define LOG_TRACE "TRACE" #define LOG_ERROR "ERROR" #define LOG_INFO "INFOR" #define LOG_CRIT "CRTCL" #define LOG(level, format, ...) \ do { \ fprintf(stderr, "[%s|%s@%s,%d] " format "\n", \ level, __func__, __FILE__, __LINE__, ##__VA_ARGS__ ); \ } while (0) int main() { LOG(LOG_DEBUG, "a=%d", 10); return 0; }

或者

#define DBG(format, args...) fprintf(stderr, "[%s|%s@%s,%d] " format "\n", APP_NAME, __FUNCTION__, __FILE__, __LINE__, ## args );