Getting Free Disk Space of certain directory

[lucky6969b]

_int64 free_space_64bit;
PULARGE_INTEGER lpFreeBytesAvailable, lpTotalNumberOfBytes,lpTotalNumberOfFreeBytes;
//char currentPath[MAX_PATH];
//GetCurrentDirectoryA(MAX_PATH, currentPath);
GetDiskFreeSpaceExA("H:\\C", lpFreeBytesAvailable, lpTotalNumberOfBytes,lpTotalNumberOfFreeBytes);
free_space_64bit = lpFreeBytesAvailable->HighPart << 32 | lpFreeBytesAvailable->LowPart;

This directory "H:\\C" does exist, if I comment out the GetDiskFreeSpaceExA line, the program doesn't crash, but it leads to some peculiar results (some uninitialized and random value, but at least it doesn't crash)
Any ideas?
Thanks
Jack

[lucky6969b]

Still not working

LPDWORD lpSectorsPerCluster, lpBytesPerSector, lpNumberOfFreeClusters,  lpTotalNumberOfClusters;
//char currentPath[MAX_PATH];
//GetCurrentDirectoryA(MAX_PATH, currentPath);
GetDiskFreeSpaceA("H:\\C",lpSectorsPerCluster, lpBytesPerSector, lpNumberOfFreeClusters, lpTotalNumberOfClusters);
free_space_64bit = *lpBytesPerSector * *lpSectorsPerCluster * *lpNumberOfFreeClusters;

[GCDEF]

The pointers you're passing as arguments aren't initialized.

[2kaud]

DWORD SectorsPerCluster, BytesPerSector, NumberOfFreeClusters,  TotalNumberOfClusters;
GetDiskFreeSpaceA("H:\\C",&SectorsPerCluster, &BytesPerSector, &NumberOfFreeClusters, &TotalNumberOfClusters);
free_space_64bit = BytesPerSector * SectorsPerCluster * NumberOfFreeClusters;

You need to pass the address of the variables used. GetDiskFreeSpaceEx() is used similarly.

[lucky6969b]

Thanks

[lucky6969b]

But one thing, is that how come this api would tell that a "directory" has 3Gigs but the total disk space for the drive is 20Gigs up
What is the true meaning of the free disk space of a "directory"?
Thanks
Jack

[Igor Vartanov]

There's such a thing called quota. Physical disk free space is a physical limit, but user's quota is a virtual one.

[Igor Vartanov]

Besides quota there might be another sort of limit, not that obvious one. In case the directory is a symlink pointing to a directory hosted on other physical drive, the real directory limit is the corresponding drive free space.

[OReubens]

hence... if you want the free space on the volume, you should query the free space for the root path.
Anything else might be more/less than that depending on what the path really is.