SHGetDiskFreeSpace是一个计算机函数，用于获取磁盘的空闲空间。
SHGetDiskFreeSpace介绍
SHGetDiskFreeSpace是一个计算机函数，用于获取磁盘的空闲空间。
算法举例
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.
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.
Address of a ULARGE_INTEGER value that receives the total size of the volume, in bytes.
Address of a ULARGE_INTEGER value that receives the number of bytes of free space on the volume.
