Mr Neil, Thank you! I made SPeriDLL.dll successfully in your way. My BCB version number is 5.0. What I met is little different from yours. However I made success in building SPeriDLL.dll . Thanks. BTW: I want to add some function in this program with VCL. Can I do it in this way?
"I want to add some function in this program with VCL." I don't know, but I'd guess not; I'd guess that MFC and VCL are mutually exclusive? Maybe you could put your extensions in a separate DLL using VCL? Now that we know that it is possible to write BCB DLLs for uVision, it might be better to start by re-writing SPeriDLL completely in VCL, and then go from there? Maybe that's just far too many TLAs for one post!? ;-)