ok can you please give me te link of the code coc i searched a lot and all what i found is a matlab code gobar

Did you include the lib that contains engopen? Check this directory for some of the libraries that you need to link. \extern\lib\win32\microsoft\msvc60

Maybe this sample can help you: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample/html/vcsamDllScreenCapSample.asp[^] Jack --------------------------------------------------------------------------------- XD++ MFC/C++ Flow/Diagram Library -- http://www.ucancode.net