using GetDiskFreeSpaceEx

[MPrestonf12]

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

[jim mcnamara]

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;    }  
}}

[chachi]

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

    __int64 userBytes;
__int64 totalBytes;
__int64 totalFreeBytes;


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

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

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.

[MPrestonf12]

great, thanks guys

[MPrestonf12]

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

[CornedBee]

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