PrntDlgex marshaling problem

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jon morgan - 07 Sep 2003 17:52 GMT

Mathias,

Just another quickie, this time on the PRINTDLGEX structure.

The lpcallback field requires the address of an iprintdialogcallback
interface.

Does the interface require any marshaling - I tried various attributes when
setting lpcallback - eg MarshalAs.Interface - but none seem to work.

Thanks again

Jon

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Mattias Sj?gren - 08 Sep 2003 16:06 GMT

Jon,

>The lpcallback field requires the address of an iprintdialogcallback
>interface.
>
>Does the interface require any marshaling - I tried various attributes when
>setting lpcallback - eg MarshalAs.Interface - but none seem to work.

If you're not going to use the callback feature, you can just make it
an IntPtr or [MarshalAs(UnmanagedType.Interface)] object and set it to
IntPtr.Zero or null.

Otherwise you have to declare and implement the IPrintDialogCallback
insteface and change the struct member type to IPrintDialogCallback.

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
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