help, updating file via file pointer

This is a discussion on help, updating file via file pointer within the C Programming forums, part of the General Programming Boards category; Hi, I have this problem of file pointer not updating file, it just keep on writing the old file. For ...

  1. #1
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    Jun 2003
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    help, updating file via file pointer

    Hi, I have this problem of file pointer not updating file, it just keep on writing the old file. For example, I punched in a couple of datas and hit the save file function(writes to a file recording the data), but when I keyed in the new datas and want to save again, the saved content is still the old one not the newly created data.

    I have tried this fptr=fopen("data","w+"), it still does not update the new values into the file. Can anyone please help?

  2. #2
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    Can't help much without seeing the code...

    Is it possible that you're writing to another copy of "data" (and looking in the wrong directory)?

  3. #3
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    it just a simple routine actually:

    code:
    Code:
    void save_onto_file(void)
    {
             FILE* fptr;
             int i;
             int temp;
             
             fptr=fopen("file-data","w+");
             if(!fptr)
            {       exit(101);}
            else
             {
                    printf("create a new file\n");
              }
            
            for(i=0;i<=2;i++)
           {   
                   
                   temp=datas[i];
                   
                   fprintf(fptr,"%d %d\n",i,temp);
                
                   
             }

  4. #4
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    Oct 2001
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    2,934
    Maybe you need to close the file at the end of save_onto_file():

    fclose(fptr);

  5. #5
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    Jun 2003
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    31
    I tried that, but strangely it still doesn't solve the problem.

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