关闭文件句柄 fclose 会出错 求解 付上代码

[hahanibc]

//将文件base64编码后发送

FILE* fp=fopen(m_attachment,"rb");
if(fp==NULL)
{
m_error=OPEN_FILE_ERROR;
return 0;
}


char buf [10001];
memset(buf,0,BUFFERSIZE+1);

char buf2[10001];
memset(buf2,0,BUFFERSIZE+1);
int readcount=0;
while(!feof(fp))
{
readcount=fread(buf,1,BUFFERSIZE,fp);
if(readcount>0)
{
base64(buf,buf2);
sprintf(m_sendbuff,"%s%s",buf2,"\r\n");
fclose(fp);
if(senddata()==0)
{
return 0;
}
memset(buf,0,BUFFERSIZE+1);
memset(buf2,0,BUFFERSIZE+1);
}
}
sprintf(m_sendbuff,"%s","\r\n");
if(senddata()==0)
{
return 0;
}
fclose(fp);
}


经过测试发现
执行sprintf(m_sendbuff,"%s%s",buf2,"\r\n");之后
fclose(fp);就会出错

如果 buf2是一个char *buf2 = new char [10001];
delete [] buf2;也和上边一样在sprintf后必出错
求解

[xylicon]

//将文件base64编码后发送

FILE* fp=fopen(m_attachment,"rb");
if(fp==NULL)
{
m_error=OPEN_FILE_ERROR;
return 0;
}


char buf [10001];
memset(buf,0,BUFFERSIZE+1);

char buf2[10001];
memset(buf2,0,BUFFERSIZE+1);
int readcount=0;
while(!feof(fp))
{
readcount=fread(buf,1,BUFFERSIZE,fp);
if(readcount>0)
{
base64(buf,buf2);
sprintf(m_sendbuff,"%s%s",buf2,"\r\n");
fclose(fp);
if(senddata()==0)
{
return 0;
}
memset(buf,0,BUFFERSIZE+1);
memset(buf2,0,BUFFERSIZE+1);
}
}
sprintf(m_sendbuff,"%s","\r\n");
if(senddata()==0)
{
return 0;
}
fclose(fp);
}

你不是在上面已经close一次了吗。

[hahanibc]

测试后的代码 发问题的时候忘记改回来

//将文件base64编码后发送

FILE* fp=fopen(m_attachment,"rb");
  if(fp==NULL)
  {
m_error=OPEN_FILE_ERROR;
return 0;
  }


  char buf [10001];
  memset(buf,0,BUFFERSIZE+1);

    char buf2[10001];
    memset(buf2,0,BUFFERSIZE+1);
  int readcount=0;
  while(!feof(fp))
  {
readcount=fread(buf,1,BUFFERSIZE,fp);
if(readcount>0)
{
base64(buf,buf2);
sprintf(m_sendbuff,"%s%s",buf2,"\r\n");
if(senddata()==0)
{
  return 0;
}
memset(buf,0,BUFFERSIZE+1);
memset(buf2,0,BUFFERSIZE+1);
}
  }
  sprintf(m_sendbuff,"%s","\r\n");
  if(senddata()==0)
  {
return 0;
  }
  fclose(fp);
}

经过测试发现
执行sprintf(m_sendbuff,"%s%s",buf2,"\r\n");之后
fclose(fp);就会出错

如果 buf2是一个char *buf2 = new char [10001];
delete [] buf2;也和上边一样在sprintf后必出错
求解

[hahanibc]

请看2楼的问题
1楼作废 谢谢

[hahanibc]

请高手帮忙看看

[aizibion]

你以rb打开文件得，能写吗？

[aizibion]

[Quote=引用 5 楼 aizibion 的回复:]
你以rb打开文件得，能写吗？
[/Quote]
m_sendbuff多大啊

if(senddata()==0)
{
return 0; //返回前也没关闭啊
}

[hahanibc]

sendbuff [10001];

[hahanibc]

没写。
只读。

[hahanibc]

返回0的话就代表发送失败

if(senddata()==0)
{
return 0; //返回前也没关闭啊
}

应该返回前关句柄。

但与这是问题好象没有关系。

[stjay]

BUFFERSIZE是多少？
>10000的话就会造成越界
fp被覆盖，fclose就出错

[hahanibc]

OK了 原来是BUFFERSIZE的问题