DsgnIntf.dcu not found Delphi error

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I was transferring my Code from Delphi 5 to Delphi XE5 while running I got error DsgnIntf.dcu not found. And I found that DsgnIntf.dcu was a part of ToolsAPI that introduced in Delphi 5. Now in newer versions of Delphi this file has been replaced by DesignIntf.pas. The property editors units and other design-time files were also moved into DesignEditors, DesignMenus, DesignWindows.

So the solution is to replace all references of DsgnIntf to DesignIntf in a unit.

But, when we have a single package for component development then we must separate run-time code and design-time code into separate packages. Create a run-time only package that contains just your component code. Create a design-time only package that specifies your run-time only package and the IDE's DesignIDE package in its requires list, and contains just your property editor and registration code. Then you can install the design-time only package into the IDE, and refer to the run-time only package in your projects. The DesignIDE package resolves the DsgnInf reference, but it is NOT allowed to be linked into run-time executable. It is for the IDE's use only. To add DesignIDE in you package,  Open up your design-time package, select the requires folder and hit the Add button. Type designide.dcp and hit OK. Recompile your package and the error should go away.


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