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how to use IDropTarget?

 
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ilitirit



Joined: 28 Dec 2004
Posts: 7
PostPosted: Thu Jan 06, 2005 6:18 am    Post subject: how to use IDropTarget? Reply with quote
i'm trying to make a form a drop target. the form has already been created with all it's event handlers and controls. so all i want to do now is add drag & drop functionality, but as soon as i implement the interface i get hundreds of compiler errors.

this code compiles:
Code:

private import dfl.all;
private import dfl.winapi;
private import dfl.wincom;

class MainForm : Form, IDropTarget
{
   HRESULT QueryInterface(IID* riid, void** pvObject){return 0;}
    ULONG AddRef(){return 0;}
    ULONG Release(){return 0;}
   
   public HRESULT DragEnter(dfl.wincom.IDataObject pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect){return 0;}
   public HRESULT DragLeave(){return 0;}
   public HRESULT DragOver(DWORD grfKeyState, POINTL pt, DWORD* pdwEffect){return 0;}
   public HRESULT Drop(dfl.wincom.IDataObject pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect){return 0;}
}

void main()
{
   Application.run(new MainForm);
}

now look what happens when i start adding event handlers to 'MainForm'

Code:

   void closeHandler(Object o, EventArgs ea)
   {
      return;
   }
   
   this()
   {
      /*
       The following line fails with:
       test.d(18): function dfl.event.Event!(...).Event.opCatAssign (void delegate(Object ,EventArgs )handler) does not match argument types (void delegate(Object o,EventArgs ea))
       test.d(18): cannot implicitly convert expression &this.closeHandler of type void delegate(Object o,EventArgs ea) to void delegate(Object ,EventArgs )
      */
      // closed ~= &closeHandler;
      
      // Compiles without errors
      closed ~= delegate   void(Object o, EventArgs ea){ return; };
      
      void nestedFunction(Object o, EventArgs ea)
      {
         return;
      }
      
      // Compiles without errors
      closed ~= &nestedFunction;
      
      void delegate (Object o, EventArgs ea) dg;
      
      // dg = &closeHandler;  <- This line fails
      
      dg = &nestedFunction;
      // Compiles without errors
      closed ~= dg;
   }


any ideas? what am i doing wrong?
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Thu Jan 06, 2005 8:10 am    Post subject: Reply with quote
IDropTarget is an extern(Windows) interface and it seems that it's turning all your MainForm's member functions into extern(Windows) as well. After all your IDropTarget function implementations put extern(D): and it should work as expected.
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ilitirit



Joined: 28 Dec 2004
Posts: 7
PostPosted: Fri Jan 07, 2005 1:55 am    Post subject: Reply with quote
Vathix wrote:
IDropTarget is an extern(Windows) interface and it seems that it's turning all your MainForm's member functions into extern(Windows) as well. After all your IDropTarget function implementations put extern(D): and it should work as expected.


OK that worked. Do I have to call OleInitialize/OleUninitialize explicitly or is that handled by DFL?

edit: Nevermind. It OleInitialize as if they are called in the constructor of the Application so I don't need to worry about it
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Fri Jan 07, 2005 3:55 am    Post subject: OleInitialize Reply with quote
ilitirit wrote:
Do I have to call OleInitialize/OleUninitialize explicitly or is that handled by DFL?
It currently calls them, but doesn't promise to. You may want to call them anyway; the calls can be nested.
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