quote:

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Original post by BuschnicK

Nice article, this really is a FAQ on the boards...

You are using a rather old style of C++ though:
1) first, the header file 'iostream' should be used (notice the missing '.h'). These are the new, standard C++ headers, that declare all their stuff in the std namespace and contain some more, minor changes and improvements.

2) second, you are using the old style of casting:
> then you can leaf through a C++ book on pointers if
any 'good' as in up-to-date and correct C++ book will teach you about the static_cast, dynamic_cast, reinterpret_cast and const_cast operators and advise you to prefer these over the old C style of casting.

regards,

BuschnicK

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Original post by Cyberdrek
One little correction, the new C++ standard for file I/O is fstream not iostream. iostream is the old C++ standard.

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Original post by BauerGL
For example I right now have this code for making a log:
<SNIP>!

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class CLogFile
{
public:
  CLogFile();
  CLogFile( const std::string & filename );
  bool Open( const std::string & filename );
  void Close();

  template <typename T>
  friend std::ostream & operator << ( std::ostream & os, T data );

private:
  bool good;
  std::ofstream fout;
};
.
CLogFile::CLogFile( const std::string & filename )
{
  good = true;
  fout.open( filename.c_str(), ios_base::out|ios_base::app );
  if( fout.fail() )
  {
    // uncomment the next line to print the error to STDERR:
    // std::cerr << "Failed to open log file " << filename << std::endl;
    good = false;
  }
}
.
void CLogFile::Close()
{
  if( fout.is_open() )
    fout.close();
}
.
template <typename T>
std::ostream & operator << ( std::ostream & os, T data )
{
  os << data;
  return os;
}
 

friend ostream &operator << (ostream& Buffer, const CLogFile aLog);

ofstream g_DebugText;

template<class T> inline void SetError(T String)
{
	g_DebugText << String << endl;
}

Quote:

Original post by chyke how do you create a file for reading or writing without manually typing it in the code fstream myfile("xxxx.xxx"); For instance, I want the user to supply the filename during program execution.

#include <string>
#include <fstream>

int main()
{
    std::string filename = getSomeInput();
    std::ifstream file( filename.c_str() );
    // use the file
}