C++文件操作

最新推荐文章于 2023-02-23 22:00:19 发布

PeterHuaWei3

最新推荐文章于 2023-02-23 22:00:19 发布

阅读量1.1k

点赞数

CC 4.0 BY-SA版权

文章标签： c++ file delete

本文链接：https://blog.youkuaiyun.com/PeterHuaWei3/article/details/7183059

1、追加内容信息

int WriteToStatistic(const char* buf,int len)
{
	if (!len)
	{
		return -1;
	}
	
	FILE *fHandle = fopen("statistic/WMMPT.txt","a");
	if (!fHandle)
	{
		return -1;
	}

	char* bufTemp = new char[len+2];
	memset(bufTemp,0,len+2); 
	strncat(bufTemp,buf,len);
	bufTemp[len] = '\n';

	if ( len+1 != fwrite(bufTemp,1,len+1,fHandle) )
	{
		delete []bufTemp;
		return -1;
	}

	fclose(fHandle);
	delete []bufTemp;
	
	return 0;
}

2、判断文件大小

int CheckWMMPTSize()
{
    FILE* file = fopen("statistic/WMMPT.txt", "rb");
    int size = 0;
    if (file)
    {
       fseek(file,   0   ,SEEK_END);
       size   =   ftell(file);

       //当文件大于10M时自动删除文件
       if(size > 10*1024*1024)
       {
          if( remove( "statistic/WMMPT.txt" ) == -1 )
             printf( "Deleted statistic/WMMPT.txt\n" );	  
       }
       fclose(file);
    }
    return size;
}

3、写文件

void WriteToFlowMsg(UINT32 temp)
{
    FILE *pFile=fopen("statistic/FlowMsg.txt","w");
    char *pBuff = new char[12];
    memset(pBuff,0,12);
    sprintf(pBuff,"%d",temp+1);
    fwrite(pBuff,1,strlen(pBuff),pFile);
    fclose(pFile);
    delete []pBuff;
}