Thread: single File Pointer to Multiple Files

  1. #1
    eat my shorts!
    Join Date
    Apr 2002
    Posts
    294

    single File Pointer to Multiple Files

    Code:
    int main(int argc, char *argv[])
    {
    int ReadFile=argc-1;
    while(ReadFile!=1)
    {
           FILE *pPoint = fopen (argv[ReadFile],"r");
           if (pPoint==NULL)
                      return 0;
    .
    ....
    .... do something
    
    
             fclose (pPoint);					
    	printf("\n\n");
    	ReadFile=ReadFile-1;					
    	fflush(pPoint);
    }
    it does print the first file, after that it gives blank for other files
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  2. #2
    eat my shorts!
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    forgot to reset variable
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  3. #3
    Gawking at stupidity
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    Quote Originally Posted by dayknight
    forgot to reset variable
    What variable?

    Anyway, here's my suggestions...

    First of all, you shouldn't fflush() a closed pointer or a file that's only opened for reading for that matter. I'm not sure why it's there in the first place anyway. Did you add it in for some sort of troubleshooting?

    Secondly, what happens if argc is 1 to start? You'll be looping through all sorts of negative indexes for argv[] which is not good. Use > 0 instead of != 1.

    Thirdly, this loop would be a lot more clear if you used for() instead of while(). Did you mean to show the files in reverse order? Try writing it like this instead:
    Code:
    for(ReadFile = argc - 1;ReadFile > 0;ReadFile--)
    {
      // open the file
      // process it
      // close it
    }
    Last edited by itsme86; 09-15-2005 at 04:30 PM.
    If you understand what you're doing, you're not learning anything.

  4. #4
    Registered User
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    Why are you fflush'ing it after you fclose it?
    Your question could use some more information too.

  5. #5
    and the hat of int overfl Salem's Avatar
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    > if (pPoint==NULL)
    In addition to the the flushing a closed file, how about printing an actual message "could not open file", and perhaps use perror() to tell you why you couldn't open a file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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