Shulou(Shulou.com)06/01 Report--

I believe many inexperienced people don't know what to do about how to get the file size in Linux. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Code implementation:

Unsigned long get_file_size (const char * filename) {unsigned long size; FILE* fp= fopen (filename, "rb"); if (fp==NULL) {printf ("ERROR: Open file% s failed.\ n", filename); return 0;} fseek (fp, SEEK_SET, SEEK_END); size=ftell (fp); fclose (fp); return size Unexpectedly, after the execution of the program, it was found that some files could get the size correctly, while some files could not get the file size correctly, checked the code, and found nothing wrong. However, a problem has been found in this process, that is, the files that can get the size correctly are relatively small files, while the ones that go wrong are very large files. So think of whether it is because the standard C file operation function does not support files of more than a certain size, so Google for a while, did not expect that the guess is correct, the standard C file operation function does not support more than 2G files to read.

The problem has been found, and it seems that there is only another way to achieve it, because some functions of standard C are rarely used, so we have to turn to Google. After reading a lot of reference articles on the Internet, we found that calling the stat function can correctly get the status information of the super-large file (including the file size, of course), so the following code is implemented:

Unsigned long get_file_size (const char * filename) {struct stat buf; if (stat (filename, & buf))

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