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Old November 1st, 2007, 11:39 PM
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Default problem while file read

Hello,
 I think it is very silly, but i couldnt trace out the problem.
 I am trying to read 3 lines from file using fgets, then using fseek i m placing the pointer back one line.
 But after that when i do fgets i m not getting the complete line.Instead first 3 charecters are missing.

My code looks like

    for(i = 0; i < 3; i++)
        fgets(strBuf,500,fpInFileNext);

    cnt = strlen(strBuf);
    fseek(fpInFileNext,-(cnt),SEEK_CUR);
    fgets(strBuf,500,fpInFileNext); // now strBuf contains line with
                                         3 missing charecters.

What may be the problem?????????

Cheers,
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Old November 5th, 2007, 05:46 AM
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Default

Hmm. How about just rewinding like:

fseek(fpInFileNext,-(cnt+3),SEEK_CUR);

I think the problem comes from new-line character (\r\n in Windows, \n in *nix) so you need to rewind past those also. I'm not sure where the third character comes from (too little coffeiine, can't think straight). If you are writing portable code you propably need to do some evil precompilter thingy:

#if _WIN32_
fseek(fpInFileNext,-(cnt+3),SEEK_CUR);
#else
fseek(fpInFileNext,-(cnt+2),SEEK_CUR);
#endif

Or something like that.

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