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Editorial Team
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Asked: 2026-05-13T10:16:48+00:00

UPDATE: I thought it was Windsows.h i need to include and you have confirmed

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UPDATE:
I thought it was Windsows.h i need to include and you have confirmed this, but when i do include it i get a bunch of messages like the following…

1>C:\Program Files\Microsoft SDKs\Windows\v6.0A\include\objidl.h(5934) : error C2872: 'IDataObject' : ambiguous symbol
1>        could be 'C:\Program Files\Microsoft SDKs\Windows\v6.0A\include\objidl.h(251) : System::Windows::Forms::IDataObject IDataObject'
1>        or       'c:\windows\microsoft.net\framework\v2.0.50727\system.windows.forms.dll : System::Windows::Forms::IDataObject

I Don’t know how to fix this, eik!

I’m trying to call PeekMessage but when I try to compile I get the following errors.

‘MSG’ : undeclared identifier
‘HWND’ : undeclared identifier
‘PM_REMOVE’ : undeclared identifier

my code is as below…

MSG message;
    while(form->Created)
                {
                    while( PeekMessage( &message, (HWND)form->Handle.ToPointer(), 0, 0, PM_REMOVE ) )
                    {
                        TranslateMessage( &message );
                        DispatchMessage( &message );
                        if( !mainWindow->Created )
                            break;
                    }
                }

I know what these structures are but can get the compiler to recognise them. Am i missing a ref or are there VC++ alias’ for the same?

Cheers.

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1 Answer

  1. Editorial Team

    You’ll get several nasty symbol name collisions when you #include windows.h in a C++/CLI Windows Forms app. But this is self-induced. Pumping your own message loop in a WF app is not appropriate. It already has one, Application::Run(). You can’t write your own, you won’t be able to preprocess the message appropriately to make stuff like keyboard shortcuts work.

    Work through some C++/CLI programming tutorials before you try this.

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