测试FREE硬盘空间的程序，显示too many arguments错误，请指教，付源程序

我写了一个测试FREE硬盘空间的程序，总是报错。
显示的错误：error C2197: 'FARPROC' : too many arguments for call through pointer-to-function


BOOL GetDiscFreeSpace(LPCTSTR lpszPath, DWORDLONG* pnFree)
   {
BOOL bRet = FALSE;

// We need to determine whether GetDiskFreeSpaceEx is available by calling LoadLibrary
// or LoadLibraryEx, to load Kernel32.DLL, and then calling the GetProcAddress to
// obtain an address for GetDiskFreeSpaceEx.


        FARPROC lpfnDLLProc = NULL;

lpfnDLLProc = GetProcAddress(GetModuleHandle("kernel32.dll"), "GetDiskFreeSpaceExA");

if(lpfnDLLProc) // If we got an address to the function
{
ULARGE_INTEGER nTotalBytes, nTotalFreeBytes, nTotalAvailable;

lpfnDLLProc(lpszPath, &nTotalAvailable, &nTotalBytes, &nTotalFreeBytes);
  *pnFree = nTotalAvailable.QuadPart;
bRet = TRUE;
}
  if(!bRet) // We have to try and use GetDiskFreeSpace()
    {
   ULONG secpercluster, bytespersec, nooffreeclusters, totalnoofclusters;

   GetDiskFreeSpace(lpszPath, &secpercluster, &bytespersec,&nooffreeclusters, &totalnoofclusters);
   
  *pnFree = (nooffreeclusters * secpercluster * bytespersec);
  bRet = TRUE;
   
    }
  return bRet;
  }

应该使用这种方法引用函数
http://www.driverdevelop.com/forum/viewthread.php?tid=82029

没有用的，我在.NET的VC++下面编译通过不了.GetProcAddress本身就是FARPROC型的.强制转换不了.

没有用的，我在.NET的VC++下面编译通过不了.GetProcAddress本身就是FARPROC型的.强制转换不了.

谁说的？

#include <windows.h>

typedef BOOL (*LPGETDISKFREESPACEEXA)(
  LPCTSTR,                 // directory name
  PULARGE_INTEGER,    // bytes available to caller
  PULARGE_INTEGER,    // bytes on disk
  PULARGE_INTEGER// free bytes on disk
);

BOOL GetDiscFreeSpace(LPCTSTR lpszPath, DWORDLONG* pnFree)
{
BOOL bRet = FALSE;

// We need to determine whether GetDiskFreeSpaceEx is available by calling LoadLibrary
// or LoadLibraryEx, to load Kernel32.DLL, and then calling the GetProcAddress to
// obtain an address for GetDiskFreeSpaceEx.


LPGETDISKFREESPACEEXA lpfnDLLProc = NULL;

lpfnDLLProc = (LPGETDISKFREESPACEEXA)GetProcAddress(GetModuleHandle("kernel32.dll"), "GetDiskFreeSpaceExA");

if(lpfnDLLProc) // If we got an address to the function
{
ULARGE_INTEGER nTotalBytes, nTotalFreeBytes, nTotalAvailable;

lpfnDLLProc(lpszPath, &nTotalAvailable, &nTotalBytes, &nTotalFreeBytes);
*pnFree = nTotalAvailable.QuadPart;
bRet = TRUE;
}
if(!bRet) // We have to try and use GetDiskFreeSpace()
{
ULONG secpercluster, bytespersec, nooffreeclusters, totalnoofclusters;

GetDiskFreeSpace(lpszPath, &secpercluster, &bytespersec,&nooffreeclusters, &totalnoofclusters);

*pnFree = (nooffreeclusters * secpercluster * bytespersec);
bRet = TRUE;

}
return bRet;
}

void main()
{
DWORDLONG dlSize=0;
GetDiscFreeSpace(NULL,&dlSize);
}

在vc6.0下编译通过，没装.net应该可以的

在NET上编译过不了，*pnFree = nTotalAvailable.QuadPart;出错。我修改了pnFree为__int64也过不了。报错：
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.  This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.
前面的那个倒是没有问题的了。谢谢。请问您知道硬盘的扇区怎么读写吗，在WIN32下面。