时间:2008-05-13 08:37:08   来源:论坛整理  作者:  编辑:chinaitzhe

用write写test.txt和test.bin文件，可是输出是空文件，
代码：
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

struct callerIdx
{
__int64 caller;
long call_no;
};

bool getData (callerIdx& cid);
void writeFile (ofstream& ot, ofstream& ob,callerIdx& cid);


int main()
{

ofstream oftxt;
char* txtName = "test.txt";
oftxt.open (txtName, ios::out ¦ ios::app);
if(!txtName)
{
cout < < "\nCannot open " < < txtName < < endl;
exit (100);
}

ofstream ofbin;
char* binName = "test.bin";
ofbin.open (binName, ios::out ¦ ios::binary ¦ ios::app);
if( !binName )
{
cout < < "\nCannot open " < < binName < < endl;
exit (101);
}
callerIdx Idx;
while (getData (Idx))
{
cout < < "Begin Write File!\n";
writeFile (oftxt,ofbin,Idx);
}

oftxt.close();
ofbin.close();

return 0;

} // main
/*===================== getData =======================*/
bool getData (callerIdx& cid)
{
cout < < "\nEnter caller : ";
cin >> cid.caller;
cout < < "\nEnter IDX Number :";
cin >> cid.call_no;


if(cid.caller > 0 && cid.call_no > 0)
return 1;
else
return 0;
} // getData

/*===================== writeFile =========================*/
void writeFile (ofstream& ot, ofstream& ob,callerIdx& cid)
{
cout < < "\nCaller Number is " < < cid.caller
< < "\nIdx Number is " < < cid.call_no;
ot.write ((char*) &cid,sizeof(callerIdx));
if(!ot.good())
cout < < "\nWrite File Error";
ob.write ((char*) &cid,sizeof(callerIdx));
if(!ob.good())
cout < < "\nWrite File Error";
cout < < " \nFile Write complete!";
return;
} // writeFile

网友回复:建议用C语言中读写文件函数，原来我也经常用fstream来进行读写文件，这种在C基础上进行封装的，有时会出现莫名奇妙的错误，

FILE *pFile=fopen( "stud.txt ", "a ");
fseek(pFile,0,SEEK_SET);
char*s= "222";
fwrite(s,1,sizeof(s),pFile);
fclose(pFile);
网友回复:

引用 1 楼 yys213 的回复:

建议用C语言中读写文件函数，原来我也经常用fstream来进行读写文件，这种在C基础上进行封装的，有时会出现莫名奇妙的错误，

FILE *pFile=fopen( "stud.txt ", "a ");
fseek(pFile,0,SEEK_SET);
char*s= "222";
fwrite(s,1,sizeof(s),pFile);
fclose(pFile);

sizeof(s)是多少? 不出错才怪。
网友回复:文件还没刷新
在write后加flush试试
网友回复:__int64 cin cout 支持的不好
scanf printf 使用 "%I64d" 识别
假如你编译过了 write 不会有问题