getting upload and download bandwidth

This is a discussion on getting upload and download bandwidth within the C++ Programming forums, part of the General Programming Boards category; :P Perhaps I should research more before I post. Anyway, here's where I'm at. I figured out what an Assertion ...

  1. #16
    Registered User Nova_Collision's Avatar
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    :P Perhaps I should research more before I post. Anyway, here's where I'm at. I figured out what an Assertion failure is, but the _popen example (THE EXAMPLE!!) in MSVS 6 generates an error itself. Which makes me wonder.....

    Anyway, I've stepped through and as far as I can tell, there is no way for this code to not generate an error. It tries to use a variable in fgets.c (FILE *str) in a check (_ASSERTE(str != null)) without ever initialising str to anything. That's what I understand from the code, anyway.

    Is there any other way for me to get what "java -version" returns at command line in my program?
    When in doubt, empty your magazine - Murphy's Laws Of Combat #7

  2. #17
    and the hat of wrongness Salem's Avatar
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    > fgets.c (FILE *str) in a check (_ASSERTE(str != null))
    Yeah, it means the popen() failed.

    Code:
    FILE *fp = _popen("java -version", "r");
    if ( fp == NULL ) {
      perror( "Gotta problem" );
    } else {
      // rest of your code
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #18
    Registered User Nova_Collision's Avatar
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    Okaaayyyyy......so what do I do? No matter what I try, the _popen fails. Every time. Example code included. Does that mean I can't check the output of command line executions?
    When in doubt, empty your magazine - Murphy's Laws Of Combat #7

  4. #19
    and the hat of wrongness Salem's Avatar
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    I dunno, does the perror() message actually tell you anything useful, like "why" it could not be completed?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #20
    Registered User Nova_Collision's Avatar
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    I figured out that _popen only works for console apps. That's where the problem lies. :P
    When in doubt, empty your magazine - Murphy's Laws Of Combat #7

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