// This code uses the #import directive.
// Put the following line at the beginning of your module

#import "XCEEDSCO.DLL" no_namespace named_guids 

CoInitialize( NULL ); 

try
{
  IXceedStreamingCompressionPtr piComp; 
  piComp.CreateInstance( CLSID_XceedStreamingCompression ); 
  piComp->License( _bstr_t( L"your license key ) ); 

  IXceedBZip2CompressionFormatPtr piBZip2; 
  piBZip2.CreateInstance( CLSID_XceedBZip2CompressionFormat );  

  piComp->CompressionFormat = IXceedCompressDataPtr( piBZip2 );  

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

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

  MessageBox( NULL, "File compressed successfully to memory", "Decompression result", MB_OK ); 

  CoTaskMemFree( pcData ); 
}
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();