Designintf.dcu not found in custom component

Question

I am here converting some customize delphi component to latest delphi xe5. I already build it in delphi xe5 ide and where desgninf i replaced with designintf and design edit

Answer 1

Such errors often happen if you take very old (Delphi 6 or before) component code and try to compile it in a newer compiler.

The unit designintf.dcu and some other units are only available to packages that link with the IDE, i.e. only for design time code. In older versions of Delphi, you would get the source code, but not anymore, because the packages in which these units are are not redistributable, they are exclusively meant for the IDE.

So at the time of Delphi 6 and 7, youw were warned to separate code that would be used at runtime and code that could only be used at designtime, by the IDE. The old component you are using did not do that, yet.

So try to find out which code actually requires designintf.dcu, move that code to a separate unit, and make it use the original unit. The original unit is now the runtime code, can be used everywhere, and doesn't need designintf.dcu. The other unit is the designtime unit and should only be linked into the package used to install the component in the IDE.

More info: Delphi FAQ