MFC 获取除C盘外，其余磁盘的总空间，及空闲空间

BOOL MyLocalMacIP::GetSpaceInfo(CString &totalspace, CString &usedspace)
{
	long long total = 0;
	long long used = 0;

	::vector drivernames;
	int drivernum = 0;

	CString str;

	DWORD size = ::GetLogicalDriveStringsA(0, NULL);
	if (0 != size)
	{
		HANDLE heap = ::GetProcessHeap();
		LPSTR lp = (LPSTR)HeapAlloc(heap, HEAP_ZERO_MEMORY, size*sizeof(TCHAR));
		::GetLogicalDriveStringsA(size*sizeof(TCHAR), lp);

		while(0 != *lp )
		{
			/* we don't need C:*/
			int str_num = strcmp((char*)lp, ("C:\\"));
			if (str_num == 0)
			{
				lp = strchr(lp, 0)+1;
				continue;
			}
			wchar_t* lp_buffer = conversion.CharToWchar(lp);
			UINT res = ::GetDriveTypeW(lp_buffer);
			if(DRIVE_FIXED == res)
			{
				CString str = lp;
				drivernames.push_back(str);
				drivernum++;
			}
			delete []lp_buffer;
			lp = strchr(lp, 0)+1;
	
		}

	}
	ULARGE_INTEGER FreeSpace, CallSpace, TotalSpace;
	
	for (int i = 0; i < drivernum; i++)
	{
		::GetDiskFreeSpaceEx(drivernames[i], &FreeSpace, &CallSpace, &TotalSpace);
		 total += CallSpace.QuadPart;
		 used += FreeSpace.QuadPart;
	}

	string stotal = conversion.IntToString(total);
	string sused = conversion.IntToString(used);
	totalspace = CString(stotal.c_str());
	usedspace = CString(sused.c_str());

    return TRUE;
}