ifstream error message

I am attempting to read a filename from the user and then open the file, however,
if I press enter instead of typing a filename I get an error from the compiler:

#######################
Debug Assertion Failed!
...
Expression: *file != _T('\0')
...
#######################

It works unless the user presses enter without typing a filename, here is the code:

string filename;
getline (cin, filename);
ifstream fin(filename.c_str());


Visual C++.NET
Windows XP


THANKS!

One possible solution is to make sure string filename contains the filename and is not empty.

Kuphryn

How can i test whether the string is empty or not.

Also...if i put my 'ifstream fin(filename.c_str());' inside an 'if' statement, all other references to 'fin' generate errors because it is an undeclared identifier

Thanks,

quizkiwi

>How can i test whether the string is empty or not.

Code:

---

#include <iostream>
#include <string>

int main()
{
  std::string filename;

  std::getline ( std::cin, filename );
 
  if ( !filename.empty() )
    std::cout<< filename <<std::endl;
  else
    std::cerr<<"You must enter a filename"<<std::endl;
}

---

>if i put my 'ifstream fin(filename.c_str());' inside an 'if' statement, all other references to 'fin' generate errors
So don't do that. :rolleyes:

Thanks, that works good!

->"Crushing dreams at the speed of sarcasm." ....my kinda person!