Irwin Scollar wrote: > Referring to: > > Robert Meek's note: > > Old components for which one has no source code: > > Is there any objection to using an earlier version of Delphi with > these components for which one has applicable dcu's and putting them > into a dll as a container which can be called from D10? If not, what > are the limitations?
Besides being a major pain the neck? DLLs can't export Delphi classes. (They can't really export C++ classes, either, but Visual C++ tries to make it happen anyway.) DLLs only export functions. In your DLL, you'd need to have a separate standalone function for each publically accessible method of the object. You'll also need special functions for the component's constructors and destructor. Then, on the receiving end, you'll be stuck with just a bunch of functions -- no object anymore, and definitely not anything you can drop on a form at design time. > Can one also do this with ActiveX controls? That might actually work. Use the old version of Delphi to generate an ActiveX control out of the component, and then import the ActiveX DLL into the new version of Delphi. I expect it will be a less-than-satisfying experience, but if you've lost the source code for your old components, this is probably the only way to make any use of the compiled code. -- Rob _______________________________________________ Delphi mailing list -> [email protected] http://www.elists.org/mailman/listinfo/delphi
