using GetDiskFreeSpaceEx

Anyone have any examples of how to use this function? Thanks

Code:

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typedef BOOL (WINAPI* PFNGETDISKFREESPACEEX)(LPCTSTR, 
                                          PULARGE_INTEGER,       
                                          PULARGE_INTEGER, 
                                          PULARGE_INTEGER);
if((hModule = ::LoadLibrary("KERNEL32.DLL"))){ 
        PFNGETDISKFREESPACEEX pDiskFreeSpaceEx = NULL;  // Get free space on partition 
          if(!(pDiskFreeSpaceEx = (PFNGETDISKFREESPACEEX) ::GetProcAddress(hModule, "GetDiskFreeSpaceExA"))) 
            {DWORD dwSectorsPerCluster = 0;   
            DWORD dwBytesPerSector    = 0;       
            DWORD dwFreeClusters      = 0;         
            DWORD dwClusters          = 0;                                     
            if(::GetDiskFreeSpace(m_DriveInfo.m_aPartitions[iIndex].m_szRoot,
                                  &dwSectorsPerCluster,                         
                                  &dwBytesPerSector,                         
                                  &dwFreeClusters,                         
                                  &dwClusters) == FALSE) {
    // Error      // Release library      ::FreeLibrary(hModule);     
    return;    }             
    ULARGE_INTEGER uliTotalNumberOfBytes;   
    ULARGE_INTEGER uliTotalNumberOfFreeBytes;             
    uliTotalNumberOfBytes.QuadPart    = dwClusters * dwBytesPerSector * dwSectorsPerCluster;
    uliTotalNumberOfFreeBytes.QuadPart = dwFreeClusters * dwBytesPerSector * dwSectorsPerCluster;  } 
else  {   
    ULARGE_INTEGER uliFreeBytesAvailableToCaller;   
    ULARGE_INTEGER uliTotalNumberOfBytes;   
    ULARGE_INTEGER uliTotalNumberOfFreeBytes;   
    if(::GetDiskFreeSpaceEx(m_DriveInfo.m_aPartitions[iIndex].m_szRoot,                           
                              &uliFreeBytesAvailableToCaller,
                            &uliTotalNumberOfBytes,
                            &uliTotalNumberOfFreeBytes) == FALSE)    {     
          // Error      // Release library      ::FreeLibrary(hModule);     
    return;    } 
}}

---

Here is an example of how I use it...

PHP Code:

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    __int64 userBytes;
__int64 totalBytes;
__int64 totalFreeBytes;


GetDiskFreeSpaceEx("C:",(PULARGE_INTEGER) &userBytes, (PULARGE_INTEGER) &totalBytes, (PULARGE_INTEGER) &totalFreeBytes); 


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With Visual Studio, cout has problems with __int64's, so you have to add something like this:

PHP Code:

---


ostream& operator<<(ostream& os, __int64 i )
{
       char buf[20];
       sprintf(buf,"%I64d", i );
       os << buf;
       return os;
}; 


---

Anyhow, the code above shows correct drive information for my drives under XP. Good luck.

great, thanks guys

I was wondering could I use just plain 'int' as the data type becasue I have to display it in a message box which needs to convert it from a integer to string format. Thanks

no, it's too small
but I think sprintf supports 64-bit integers (look in the flags table)