c++builder-2009

I would like to drag and drop files from windows explorer onto my application which is being built in Codegear RAD studio 2009. Then I would like to be able to access data from the object I am dragging and dropping. I believe I have to implement IDropTarget. Can someone please provide an example of how I might implement IDropTarget to achieve this? There is a nice example written by Michael Dunn over at codeproject.com which shows how to implement IDropTarget and access data from inside a IDataObject which is used to store data during the drag and drop operation. 来源： https://stackoverflow.com

I've recently began to upgrade my RAD Studio 2007 project to RAD Studio 2009. One thing I noticed is when seemingly simple code all of a sudden failed to compile. Example Code: class CButtonPopupMenu { // Snip public: void Init( TButton* SrcButton ) { SrcButton->OnClick = OnButtonClick; } private: void __fastcall OnButtonClick( TObject* Sender ) { // Do some button click stuff } }; // Snip TButton button = new TButton( this ); TBitBtn bitBtn = new TBitBtn( this ); CButtonPopupMenu popupButton = new CButtonPopupMenu( button ); CButtonPopupMenu popupBitBtn = new CButtonPopupMenu( bitBtn ); This