linux怎么在程序中用自定义日志文件输出信息?

发布网友发布时间：2022-04-22 20:22
共2个回答
懂视网时间：2022-05-19 22:03
代码如下:

using System; 
using System.IO; 
using System.Text; 
public class LogInfo 
{ 
private string ErrorInfo_User = ""; // 记录用户自定义错误信息 
private string ErrorPosition = ""; // 记录错误的位置信息，可包括类、函数等 
private string ErrorInfo_Sys = ""; // 记录系统产生的异常错误信息 
// 记录日志信息 
public void RecordErrorInfo(string Position, string Error_Sys, string Error_User) 
{ 
ErrorPosition = Position; 
ErrorInfo_Sys = Error_Sys; 
ErrorInfo_User = Error_User; 
} 
// 自定义日志信息格式 
private string GetLogContent() 
{ 
string LogContent = "
--------------------------------------------------------------------------
"; 
LogContent += "[自定义异常日志][" + DateTime.Now.ToString() + "]
"; 
LogContent += "=>[Position]=>[" + ErrorPosition + "]
"; 
LogContent += "=>[UserInfo]=>[" + ErrorInfo_User + "]
"; 
LogContent += "=>[SysInfo]=>[" + ErrorInfo_Sys + "]
"; 
LogContent += "--------------------------------------------------------------------------
"; 
return LogContent; 
} 
// 保存日志信息到文件 
public void SaveLogToFile() 
{ 
try 
{ 
// get the file path of the log. 
string FileName = @"log/LogInfo_" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt"; 
// get the content of the log. 
string LogContent = GetLogContent(); 
// create the stream of the log file and save the log. 
FileStream smLog = new FileStream(FileName, FileMode.Append, FileAccess.Write); 
// if the stream is correct. 
if (smLog != null) 
{ 
long lFileContentLen = smLog.Length; 
smLog.Lock(0, lFileContentLen); 
byte[] buffer = Encoding.GetEncoding("gb2312").GetBytes(LogContent); 
smLog.Write(buffer, 0, buffer.Length); 
smLog.Unlock(0, lFileContentLen); 
smLog.Flush(); 
smLog.Close(); 
} 
} 
catch 
{ } 
} 
} 
public class LogExample 
{ 
private LogInfo _Log = new LogInfo(); 
// 某处理函数一 
public void Function_First() 
    { 
try 
{ 
// do something which could be occur exception. 
} 
catch (Exception error) 
{ 
_Log.RecordErrorInfo("函数Function_First", error.Message.ToString(), "执行函数Function_First时，发生异常！"); 
_Log.SaveLogToFile(); 
} 
    } 
// 某处理函数二 
public void Function_Second() 
{ 
try 
{ 
// do something which could be occur exception. 
} 
catch (Exception error) 
{ 
_Log.RecordErrorInfo("函数Function_Second", error.Message.ToString(), "执行函数Function_Second时，发生异常！"); 
_Log.SaveLogToFile(); 
} 
} 
} 
class Program 
{ 
static void Main(string[] args) 
{ 
// 创建内建了日志的对象 
LogExample Le = new LogExample(); 
// 执行处理操作一 
Le.Function_First(); 
// 执行处理操作二 
Le.Function_Second(); 
} 
} 

  
  




                                        
                        
                        热心网友
                        时间：2022-05-19 19:11
                    
                    很简单, 打开文件/写入文件. 

bash脚本: echo "message" >> /path/to/yourlogfile

c: 这个就不用说了吧, fopen("/path/to/yourlogfile", "a"); 然后调用fwrite
如果希望printf/fprintf(stderr,等标准输出/标准错误输出直接输出到日志, 用p2:
#include <stdio.h>
#include <unistd.h>
int main()
{
    FILE *fp = fopen("log.txt", "a");
    if(fp){
        int no = fileno(fp);
        p2(no, 1);
        p2(no, 2);
        printf("stdout log\n");
        fprintf(stderr, "stderr log\n");
        fclose(fp);
    }
    return 0;
}