Problem with command line arguments

[elmvin_s]

Hi all,

I was reading Lesson 14: Accepting command line argements. There was a sample program. I manage to compile it but when executed, this message appeared:

usage: D:\CommandArg\Debug\CommandArg.exe <filename>
Press any key to continue

The thing is, i wasn't even able to enter any file name. Upon clicking the execute program button, this message appears right away. Can someone help me with this? I am using Visual C++ 6. Thank you.

The code from lesson 14 is as follows:

#include <fstream>
#include <iostream>

using namespace std;

int main ( int argc, char *argv[] )
{
  if ( argc != 2 ) // argc should be 2 for correct execution
    // We print argv[0] assuming it is the program name
    cout<<"usage: "<< argv[0] <<" <filename>\n";
  else {
    // We assume argv[1] is a filename to open
    ifstream the_file ( argv[1] );
    // Always check to see if file opening succeeded
    if ( !the_file.is_open() )
      cout<<"Could not open file\n";
    else {
      char x;
      // the_file.get ( x ) returns false if the end of the file
      //  is reached or an error occurs
      while ( the_file.get ( x ) )
        cout<< x;
    }
    // the_file is closed implicitly here
  }
}

[hk_mp5kpdw]

Are you running this from within the IDE? If so you need to set the arguments that will be passed into your program under Project->Settings->Debug Tab->Program Arguments. Type your argument into the text box and click on OK and then execute your program.