On Monday, 13 June 2016 at 17:38:41 UTC, Incognito wrote:
Cool. Oleview gives me the idl files. How to convert the idl
files to d or possibly c?
There are ready tools idl2d:
https://github.com/dlang/visuald/tree/master/c2d
and tlb2idl:
https://github.com/dlang/visuald/tree/master/tools
I've used this idl2d and it works pretty well (although not
perfect, sometimes manual editing still required).
Example of real-world DirectShow interfaces translated:
https://gist.github.com/thedeemon/46748f91afdbcf339f55da9b355a6b56
Would I just use them in place of IUnknown once I have the
interface?
If you have the interface defined AND you know its IID, you can
request it from CoCreateInstance and then use as ordinary D
object.
You might want to look at this wrapper that takes most of COM
machinery:
https://gist.github.com/thedeemon/3c2989b76004fafe9aa0
Then you just write almost as in C#, something like
auto pGraph = ComPtr!IGraphBuilder(CLSID_FilterGraph,
"pGraph").require;
ComPtr!ICaptureGraphBuilder2 pBuilder =
ComPtr!ICaptureGraphBuilder2(CLSID_CaptureGraphBuilder2).require;
pBuilder.SetFiltergraph(pGraph);
...
auto CLSID_NullRenderer =
Guid!("C1F400A4-3F08-11D3-9F0B-006008039E37"); //qedit.dll
auto pNullRendr = ComPtr!IBaseFilter(CLSID_NullRenderer,
"nulrend");
pGraph.AddFilter(pNullRendr, "Null Renderer"w.ptr);
...
auto imf = ComPtr!IMediaFilter(pGraph);
imf.SetSyncSource(null);
All the CreateInstance, QueryInterface, AddRef/Release etc. is
taken care of. And even HRESULT return codes are automatically
checked.
