// This code uses the #import directive.

// Put the following line at the beginning of your module
#import "XCEEDCRY.DLL" no_namespace named_guids 

CoInitialize( NULL ); 

try
{
  IXceedHashingPtr piHash; 

  piHash.CreateInstance( CLSID_XceedHashing ); 
  piHash->License( _bstr_t( L"your license key ) ); 

  IXceedSHAHashingMethodPtr piSHA; 

  piSHA.CreateInstance( CLSID_XceedSHAHashingMethod );  
  piSHA->PutHashSize( 256 ); 

  piHash->HashingMethod = IXceedHashDataPtr( piSHA ); 

  BYTE* pcHashValue = NULL; 
  short nHashValueSize; 
  DWORD dwBytesRead;  

  piHash->ReadFile( "c:\\temp\\source.txt", 0, 0, efpHash, TRUE, &dwBytesRead );  

  piSHA->GetHashValue( &pcHashValue, &nHashValueSize );  

  //Do something with the HashValue...  

  MessageBox( NULL, "File hashed successfully to memory", "Hashing result", MB_OK );  

  CoTaskMemFree( pcHashValue ); 
}
catch( const _com_error& xErr )
{
  char szMsg[50]; 
  wsprintf( szMsg, "Error %08x\n", xErr.Error() ); 
  MessageBox( NULL, szMsg, "Error", MB_OK ); 
}
catch( ... )
{
  MessageBox( NULL, "Unknown error", "Error", MB_OK ); 
} 

CoUninitialize();