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C语言实现写入日志文件
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef WIN32
#include <windows.h>
#else
#include <unistd.h> // linux下头文件
#endif
#define FILE_MAX_SIZE (1024*1024)
/*
获得当前时间字符串
@param buffer [out]: 时间字符串
@return 空
*/
void get_local_time(char* buffer)
{
time_t rawtime;
struct tm* timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
sprintf(buffer, "%04d-%02d-%02d %02d:%02d:%02d",
(timeinfo->tm_year+1900), timeinfo->tm_mon, timeinfo->tm_mday,
timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);
}
/*
获得文件大小
@param filename [in]: 文件名
@return 文件大小
*/
long get_file_size(char* filename)
{
long length = 0;
FILE *fp = NULL;
fp = fopen(filename, "rb");
if (fp != NULL)
{
fseek(fp, 0, SEEK_END);
length = ftell(fp);
}
if (fp != NULL)
{
fclose(fp);
fp = NULL;
}
return length;
}
/*
写入日志文件
@param filename [in]: 日志文件名
@param max_size [in]: 日志文件大小限制
@param buffer [in]: 日志内容
@param buf_size [in]: 日志内容大小
@return 空
*/
void write_log_file(char* filename, long max_size, char* buffer, unsigned buf_size)
{
if (filename != NULL && buffer != NULL)
{
// 文件超过最大限制, 删除
long length = get_file_size(filename);
if (length > max_size)
{
unlink(filename); // 删除文件
}
// 写日志
{
FILE *fp;
fp = fopen(filename, "at+");
if (fp != NULL)
{
char now[32];
memset(now, 0, sizeof(now));
get_local_time(now);
fwrite(now, strlen(now)+1, 1, fp);
fwrite(buffer, buf_size, 1, fp);
fclose(fp);
fp = NULL;
}
}
}
}
int main(int argc, char** argv)
{
int i;
for (i=0; i<10; ++i)
{
char buffer[32];
memset(buffer, 0, sizeof(buffer));
sprintf(buffer, "====> %d\n", i);
write_log_file("log.txt", FILE_MAX_SIZE, buffer, strlen(buffer));
#ifdef WIN32
Sleep(100); // 毫秒
#else
sleep(1); // 秒
#endif
}
// system("pause");
return 0;
}

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