Hi. I've been trying to use Direct2D and I ran into some problems.

1. When translating the headers from the Windows SDK, what linkage should I use for the interfaces? Currently I use none and it works, but I want some confirmation in case something comes up later and bites my in the @ss.

2. Some members in the Direct2D interfaces are inlined. This gives me access violations when I declare and use them in my files. I guess those members are not exported to the Direct2D dlls. But there's no inline keyword in D. How do I solve this?

Help please.

You mean COM interfaces? I usually do this:

interface SomeComInterface : IUnknown
{
    extern(Windows):
    BOOL PrototypeFoo();
}

But maybe this is already implicit when deriving from IUnknown, I wouldn't know.

But from what I can tell some of those prototypes seem to have C linkage, maybe you're getting access violations due to wrong calling conventions.

On 6/27/2011 1:28 PM, Andrej Mitrovic wrote:
> You mean COM interfaces? I usually do this:
>
> interface SomeComInterface : IUnknown
> {
>      extern(Windows):
>      BOOL PrototypeFoo();
> }
>
> But maybe this is already implicit when deriving from IUnknown, I wouldn't know.
>
> But from what I can tell some of those prototypes seem to have C
> linkage, maybe you're getting access violations due to wrong calling
> conventions.


Thanks for the reply. But it still doesn't work.

interface ISomeComInterface : IUnknown
{
	void funcWithManyParams(/*10 params*/);

	extern(/*insert whatever linkage here*/)
	void funcWrapperWithLessParams(/*3 params*/)
	{
		funcWithManyParams(/*fill in some default params*/);
	}
	//this func is inlined in the MS SDK header
}

DMD complains that the function body of funcWrapperWithLessParams isn't abstract.

On 6/27/11 9:04 AM, Nub Public wrote:
> DMD complains that the function body of funcWrapperWithLessParams isn't
> abstract.

I don't know if there is something COM-specific going on, but you might want to mark the wrapper method »final« – that's at least how it works for normal interfaces.

David

On 6/27/2011 4:08 PM, David Nadlinger wrote:
> On 6/27/11 9:04 AM, Nub Public wrote:
>> DMD complains that the function body of funcWrapperWithLessParams isn't
>> abstract.
>
> I don't know if there is something COM-specific going on, but you might
> want to mark the wrapper method »final« – that's at least how it works
> for normal interfaces.
>
> David


It works now. Thanks.