WINBASEAPI
BOOL
WINAPI
GetDiskFreeSpaceExA(
    __in_opt LPCSTR lpDirectoryName,
    __out_opt PULARGE_INTEGER lpFreeBytesAvailableToCaller,
    __out_opt PULARGE_INTEGER lpTotalNumberOfBytes,
    __out_opt PULARGE_INTEGER lpTotalNumberOfFreeBytes
    );
WINBASEAPI

BOOL

WINAPI

GetDiskFreeSpaceExW(

__in_opt LPCWSTR lpDirectoryName,

    __out_opt PULARGE_INTEGER lpFreeBytesAvailableToCaller,

    __out_opt PULARGE_INTEGER lpTotalNumberOfBytes,

    __out_opt PULARGE_INTEGER lpTotalNumberOfFreeBytes

    );

#ifdef UNICODE

#define GetDiskFreeSpaceEx GetDiskFreeSpaceExW

#else

#define GetDiskFreeSpaceEx GetDiskFreeSpaceExA

#

endif // !UNICODE

lpDirectoryName是驅(qū)動器的名稱。

lpFreeBytesAvailableToCaller是用戶可用的磁盤空間。

lpTotalNumberOfBytes是磁盤總共的空間。

lpTotalNumberOfFreeBytes是磁盤空閑的空間。以上都是字節(jié)為單位。

調(diào)用函數(shù)的例子如下(已驗(yàn)證)：

//獲取存儲設(shè)備信息

      ULARGE_INTEGER nFreeBytesAvailable;

     ULARGE_INTEGER nTotalNumberOfBytes;

     ULARGE_INTEGER nTotalNumberOfFreeBytes;

    TCHAR FreeBuffer[64];

     TCHAR TotalBuffer[64];

     TCHAR TotalNumberOfFreeBytes[64];

     INT cy;

     DWORD nFree = 0;

     if(GetDiskFreeSpaceEx(TEXT("\\Nandflash"),

         &nFreeBytesAvailable,&nTotalNumberOfBytes,&nTotalNumberOfFreeBytes))

     {

         //nFreeBytesAvailable = nFreeBytesAvailable/1024;

         nFreeBytesAvailable.LowPart = nFreeBytesAvailable.LowPart/1024/1024;

         nTotalNumberOfBytes.LowPart = nTotalNumberOfBytes.LowPart/1024/1024;

         nTotalNumberOfFreeBytes.LowPart = nTotalNumberOfFreeBytes.LowPart/1024/1024;

          wsprintf(FreeBuffer,TEXT("可用容量  :  %I64d.6 M"),nFreeBytesAvailable);

         wsprintf(TotalBuffer,TEXT("總?cè)萘?nbsp;    :  %I64d.6 M"),nTotalNumberOfBytes);

         wsprintf(TotalNumberOfFreeBytes,TEXT("剩余容量 :  %I64d.6 M"),nTotalNumberOfFreeBytes);//("剩余容量:%I64d\r\n M")

     }