Linux 打印可变参数日志
发布时间:2020-12-13 22:43:26 所属栏目:Linux 来源:网络整理
导读:实现了传输进去的字符串所在的文档,函数和行数显示功能。 实现了将传入的可变参数打印到日志功能。 #includestdio.h #include stdarg.h #include string .h const char * g_path = " /home/exbot/wangqinghe/log.txt " ; #define LOG(fmt,...) my_fprintf(_
实现了传输进去的字符串所在的文档,函数和行数显示功能。 实现了将传入的可变参数打印到日志功能。 #include<stdio.h> #include<stdarg.h> #include<string.h> const char * g_path = "/home/exbot/wangqinghe/log.txt"; #define LOG(fmt,...) my_fprintf(__FILE__,__FUNCTION__,__LINE__,fmt,##__VA_ARGS__) int my_fprintf(const char *pFileName,const char *pFunName,const long lLine,const char* fmt,...) { printf("%s-%s-%dn",__FILE__,__LINE__); int iRet = -1; int i = 0; va_list args; va_start(args,fmt); FILE* fp = NULL; fp = fopen(g_path,"at+"); int nFileNameLen = strlen(pFileName); char szLine[10] = {0}; sprintf(szLine,"%ld",lLine); int nLineLen = strlen(szLine); int nSpaceLen = 30 - nFileNameLen - nLineLen; for(i = 0; i < nSpaceLen; ++i) { fwrite(" ",1,1,fp); } fprintf(fp,"%s:%ld ",pFileName,lLine); iRet = vfprintf(fp,args); printf("iRet = %dn",iRet); va_end(args); fflush(fp); fclose(fp); return iRet; } int main() { char *p = "this is my first debug"; printf("%s-%s-%dn",__func__,__LINE__); LOG("%s %dn",p,1); return 0; } 输出结果: [email?protected]:~/wangqinghe/C/20190703$ gcc log.c -o log [email?protected]:~/wangqinghe/C/20190703$ ./log log.c-main-41 log.c-my_fprintf-10 iRet = 25 ? 在/home/exbot/wangqinghe/log.txt中有如下输出结果: 简单化版: #include<stdio.h> #include<stdarg.h> #include<string.h> const char * g_path = "/home/exbot/wangqinghe/log.txt"; #define LOG(fmt,"at+"); fprintf(fp,lLine); iRet = vfprintf(fp,args); //使用参数列表发送格式化输出到流stream中 printf("iRet = %dn",1); //getchar(); return 0; } 输出结果: (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |