Handling Files greater than 2 GB in MSVC6!

Question

Normal file related functions like fseek, ftell etc in Windows MSVC6 can handle files only upto 2GB (As per my current understanding, Please correct me if I am wrong).

I want to work with files >2GB. How should I go about it? What are the functions available?

Answer 1

I am not sure but the limit is 4 GB, OS API and the standard libraries using theses API and the filesystem used.

The ftell, fseek functions are using 32 bit integers so you won't be able to handle file bigger than 4GB. You would have to use the OS API directly.

So you have to be careful what function you use, for example for getting the file size you have to use the ex function GetFileSizeEx, so you have to make sure you use function that use 64 bit file offset. Same for SetFilePointerEx

Last word you have be aware that some filesystem limit the maximum filesize, the FAT32 won't handle file bigger than 4 GB by design, NTFS would handle any size but the API generally is made for 4 GB or less big file.