Let me first say that our ComponentWorks components are not officially supported in Borland Builder. You can read more about the difficulties involved here.
I have attached a VC++ 6.0 program which acquires n scans asynchronously from your DAQ device. The acquired data function in acquirenscans.cpp will execute after the nth point is sampled. I assume your setup in Builder will be similar to this cpp and header file.
The ControlImage function returns a CNiPicture. CNiPicture encapsulates the COM IPicture interface, which manages a picture object and its properties. The IPicture interface is part of the Windows SDK and manages a picture o bject and its properties. Picture objects provide a language-neutral abstraction for bitmaps, icons, and metafiles.
regards, Eric Meyer Applications Engineering National Instruments