[Mingw-users] [mingw - Windows API] Drag and Drop problems

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By: siger

I was trying to write simple aplication with drag and drop but i have i little
problem with compilation

I define virtual function

HRESULT MyIDropTarget::QueryInterface(REFIID iid,void** ppNew)
{
  if(IsEqualIID(iid,&IID_IUnknown)) 
  {
    *ppNew= this;
    this->AddRef();
    return S_OK;
  }
  if(IsEqualIID(iid,&IID_IDropTarget)) 
  {
    *ppNew= this;
    this->AddRef();
    return S_OK;
  }
  return E_NOINTERFACE;
}

In m$ compiler this code is ok(taken from source).
in MinGW I get 
droptarget.cpp: In member function `virtual HRESULT
MyIDropTarget::QueryInterface(const IID&, void**)':
droptarget.cpp:5: error: invalid initialization of reference of type 'const
GUID&' from expression of type 'const IID*'
C:\MinGWStudio\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\include\objbase.h:78:
error: in passing argument 2 of `BOOL IsEqualGUID(const GUID&, const GUID&)'
droptarget.cpp:11: error: invalid initialization of reference of type 'const
GUID&' from expression of type 'const IID*'
C:\MinGWStudio\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\include\objbase.h:78:
error: in passing argument 2 of `BOOL IsEqualGUID(const GUID&, const GUID&)'

If remove &
i must link uuid. The program compiles.
But when I try RegisterDragDrop(,) it returns E_OUTOFMEMORY
I checked in msdn there is note that I must run OleInitialize(NULL). I add this
to my program. It compiled. But when I run it, it hangs. ("There was a problem....
Send to microsoft). If I compile without OleInitialize ther no drag and drop
support. Thanks for help.

PS. Sorry for my english


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