// This code uses the #import directive.
// Put the following line at the beginning of your module
#import "XCEEDBEN.DLL" no_namespace named_guids 

CoInitialize( NULL ); 

try
{
  IXceedBinaryEncodingPtr piBinEncoder; 

  piBinEncoder.CreateInstance( CLSID_XceedBinaryEncoding ); 
  piBinEncoder->License( _bstr_t( L"your license key ) ); 

  IXceedBase64EncodingFormatPtr piBase64Encode; 
  piBase64Encode.CreateInstance( CLSID_XceedBase64EncodingFormat );  

  piBinEncoder->EncodingFormat = IXceedEncodeDataPtr( piBase64Encode );  

  BYTE* pcData = NULL; 
  DWORD dwDataSize; 
  DWORD dwBytesRead;  

  piBinEncoder->ReadFile( "c:\\temp\\source.txt", 0, 0, bfpEncode, TRUE,
                          &dwBytesRead, &pcData, &dwDataSize );  

  MessageBox( NULL, "Encoding successful!", "Encoding result", MB_OK ); 

  CoTaskMemFree( pcData ); 
}
catch( const _com_error& xErr )
{
  char szMsg[250]; 
  wsprintf( szMsg, "Error 08x\ns", xErr.Error(),(char*)xErr.Description() ); 
  MessageBox( NULL, szMsg, "Error", MB_OK ); 
}
catch( ... )
{
  MessageBox( NULL, "Unknown error", "Error", MB_OK ); 
} 

CoUninitialize();