To acquire free space in CF Card connected to an assigned station.
Function Name
INT WINAPI EasyGetCfFreeSpace(LPCSTR sNodeName, INT* oiUnallocated);
Argument
sNodeName: The station name is fixed as #WinGP.
oiUnallocated: Free Space in CF Card (Acquired in byte units)
Return value (NULL)
Normal End: 0
Problem: Error code