SHGetDiskFreeSpace

作用：获取磁盘的空闲空间

BOOL SHGetDiskFreeSpace(

LPCTSTR pszVolume,

ULARGE_INTEGER *pqwFreeCaller,

ULARGE_INTEGER *pqwTot,

ULARGE_INTEGER *pqwFree

);

//获取磁盘的空间信息

Retrieves disk space information for a disk volume.

//如果成功返回值非0

Returns non-zero if successful or zero otherwise.

pszVolume//磁盘的地址如D,表示D盘

A NULL-terminated string that specifies the volume for which size information will be retrieved. This can be a drive letter, UNC name or the path of a folder.

pqwFreeCaller //用户在此盘上的空闲空间的返回地址，可能小于磁盘空闲空间

Address of a ULARGE_INTEGER value that receives the number of bytes available to the caller on the volume. If the operating system implements per-user quotas, this value may be less than the total number of free bytes on the volume.

pqwTot //磁盘的总大小

Address of a ULARGE_INTEGER value that receives the total size of the volume, in bytes.

pqwFree //磁盘的剩余空间

Address of a ULARGE_INTEGER value that receives the number of bytes of free space on the volume.