MFC, large file (more than 2 GB) Get File Size bug

Today, when we split large files, we found a strange phenomenon:

1. Use a 5 K file to test the splitting to a file with a maximum size of 1 K.

2. When a 2.2g file is used for testing and split into a file with a maximum of 2 GB, seven 2 GB files and a small file are generated.

After one-step debugging, it is found that the size of the original 2.gb file is larger than 17 GB.

The function for getting the file size from the original error is:

Code:

1. Ulonglong getfilesize (lpctstr szfilename)
2. {
3. Cfilestatus FS;
4. If (! Cfile: getstatus (szfilename, FS) return 0;
6. Return fs. m_size;
7. }

 

And then modify it:

Code:

1. Ulonglong getfilesize (lpctstr szfilename)
2. {
3. CFileFind finder; // File Search Class
4. If (! Finder. FindFile (szFileName) return 0;
5. Finder. FindNextFile ();
6. ULONGLONG ul = finder. GetLength ();
7. Finder. Close ();
8. Return ul;
9. }

 

After modification, the split function is normal.