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ftell() is returning the wrong position of file why?

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ftell() is returning the wrong position of file why?

Mar 20th, 2009

Hi,

I have a file of approximately 4.19GB. I want to get the totall size of file using code in VC++, Here is my code

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FILE *fptrSampleVideo = fopen(filename,"rb+");
 
if(fptrSampleVideo)
{
 
fseek(fptrSampleVideo,0,SEEK_END);
 
uncompressedVideoSize = ftell(fptrSampleVideo);
 
}
FILE *fptrSampleVideo = fopen(filename,"rb+");

if(fptrSampleVideo)
{

fseek(fptrSampleVideo,0,SEEK_END);

uncompressedVideoSize = ftell(fptrSampleVideo);

}

If the file is of small size, ftell() return position correctly and the size is also correct.

If the file is of large size (4.19GB), ftell() return position 4, which is wrong.

It must return 4,190,000,000 etc. some thing like that.

can any one guide me what is the case?

Many Thanks,

--
Regards,
Asif