VC++6.0中为什么不识别ios::nocreate和ios::noreplace，如果一定要用，可以用什么代替解决？

VC++6.0中为什么不识别ios::nocreate和ios::noreplace，如果一定要用，可以用什么代替解决？

fstream fs(“fname”, ios_base::in);// attempt open for read
if (!fs)
{
// file doesn't exist; don't create a new one
}
else //ok, file exists. close and reopen in write mode
{
fs.close();
fs.open(“fname”, ios_base::out); // reopen for write
}

You can just do the opposite for ios::noreplace:

fstream fs(“fname”, ios_base::in);// attempt open for read
if (!fs)
{
// file doesn't exist; create a new one
fs.open(“fname”, ios_base::out);
}
else //ok, file exists; close and reopen in write mode
{
fs.close()
fs.open(“fname”, ios_base::out); // reopen for write
}

可以用这种方法判断文件是否存在

你好！ 引用iosteam 如果对你有帮助，望采纳。