Can someone help me plz

This is a discussion on Can someone help me plz within the C Programming forums, part of the General Programming Boards category; Before I show the code let me explain what I'm trying to do and that I've been at it for ...

  1. #1
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    Angry Can someone help me plz

    Before I show the code let me explain what I'm trying to do and that I've been at it for the last 2 1/2 hours and it is seriously starting to get under my skin lol.

    I have a dos program that will load files through it. It's kind of like a viewing program. This program isn't much use without the supported file types. If this program encounters an error while loading a file through itself, it hault loading it and display a message, then go back to the dos prompt.

    What I'm trying to do is surpress EVERYTHING that this program spits out onto the dos / dos box screen. This I can do fine lol. I will load a file through that program, with the program I'm creating now. While this external program is busy loading the file through itself I am surpressing everything it disaplays ( >NUL ) until it finally does it's thing. While the external program is loading a file through it and an error occurs however, I want to display my own message (easy) since I surpressed the standard one that the external program will be putting out (which is what I want). So, my program will do the work for you. It will activate this external dos program (command line) and tell it to load whatever file through it. If it runs into an error it displays a message. If it does not error, it does nothing(cause the external program loaded that file with no problem).

    Code:
    int main()
    {
    	if ((system("pgm >NUL") == 0))
    	{
    	printf("there was an error.");
    	}
    	else
    	{
    	printf("there wasn't an error");
    	}
    	return 0;
    }
    The world is waiting. I must leave you now.

  2. #2
    Code Goddess Prelude's Avatar
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    Soooo, what's the problem?

    -Prelude
    My best code is written with the delete key.

  3. #3
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    lol

    It displays "There was an error" evev if it worked!

    dam I should search the boards for the last time I asked this ( long time ago ) and SOMEONE here helped me out, they gave me exactly what I was looking for....
    The world is waiting. I must leave you now.

  4. #4
    Registered User SavesTheDay's Avatar
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    .....that sounded a bit rude.....

  5. #5
    and the hat of wrongness Salem's Avatar
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    system() does not return the exit status of the program it ran - it might for some, but that's non-standard

    It might be better to use one of the spawn functions in P_WAIT mode, and check it's exit status, but again, check the manual

  6. #6
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    here

    My previous post (last year) about this topic.
    I remember I got the info in this post to work, but I don't know how . I already see one problem in that post...
    system("program_call >NUL");
    if(system("program_call >NUL") == 0)
    .....that'll run the program twice.

    I've gotten all of this to work before, man I did it over and over and over again (2,000 lines worth, and you yourself Salem commented on the length of code inside one single function). No matter how many different ways I stabbed, strangled, choked, and shot at that program (with the system command in dos) I could "catch" it's error, and re-direct it to my own user friendly message.

    Now, I'm lucky to do anything!........

    Code:
    int main()
    {
    	if(system("edit >NUL") == 0)  // test with dos's edit program
    	{
    	printf("there was an error");
    	}
    	else
    	{
    	printf("no errors occured");
    	}
    	return 0;
    }
    This, runs the dos edit program and takes you back to dos with, "there was an error". I had a way before, where, if the program executed successfully, it wouldn't display anything. It would only display messages if their was abnormal action during the -startup- of the program.

    It was also, very little code(the actual checking).
    The world is waiting. I must leave you now.

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