Getting the size of jpeg image

Question

I am trying to get the size of an image file by doing the following

fp = fopen(path,"rb");
fseek(fp,0,SEEK_END);
size = ftell(fp);
fseek(fp,0,SEEK_SET);

The problem is that when I get to the first fseek my program terminates. I have tested with a text files and it works and have seen some other examples online where the same method applies to images.

`* Library implementations are allowed to not meaningfully support SEEK_END (therefore, code using it has no real standard portability).` from http://www.cplusplus.com/reference/cstdio/fseek/ — nhahtdh, Feb 12 '13 at 06:05
What is the value of FP at the second line? Have you bothered to check if the return value of fopen is NULL? — SecurityMatt, Feb 12 '13 at 06:05
@nhahtdh Is tehre any other way to get the size of an image file? — user1072706, Feb 12 '13 at 06:18
Another question http://stackoverflow.com/questions/1659307/how-to-get-large-file-size-using-c — nhahtdh, Feb 12 '13 at 06:23
Wrong link. This is the correct one: http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html — nhahtdh, Feb 12 '13 at 06:24

Linga · Answer 1 · 2013-02-12T06:30:34.293

1

you are very closed, just a small difference

FILE *f = fopen("filename", "rb");
long size = 0;

if (f == NULL)
 printf("error"); //handle error
else
{
fseek(f, 0, SEEK_END);
size = ftell(f);
}

edited Feb 12 '13 at 06:30

answered Feb 12 '13 at 06:07

Linga

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What is pfile? For simplicity we are assuming fp is not NULL. – user1072706 Feb 12 '13 at 06:16
It doesn't make sense - why would you open the file twice in different mode? And error checking should be done on `f`, not `pFile`, since it is what we are going to operate on. – nhahtdh Feb 12 '13 at 06:29

Getting the size of jpeg image

1 Answers1