如何使用/安装自定义Directshow过滤器

Question

我有自定义编译的directshow过滤器 - filter.DLL - 但如何使用，或在系统中安装此过滤器？

Answer 1

Usually you register the directshow filter into system by calling (from an elevated command prompt window on windows vista/7) regsvr32 filter.dll .

After the registration process you can use your filter with a directshow graph viewing application:

• GraphEdit (graphedt.exe), installed by Windows SDK (ex. "c:\\Program Files\\Microsoft SDKs\\Windows\\v6.0A\\bin\\graphedt.exe" )
• GraphStudio

After testing your filter with the above programs you can use it in a C++/C# client application.

Answer 2

The main way would be to register the filter file with regsvr32 filter.dll and than create the filter with it's CLSID in your application.

If the filter are in the same codebase as the application, you can just create the filter with new and use it.

I prefer to load the filter.dll with CoLoadLibrary to get the IClassFactory of the filter and create the filter. You can test this with GraphStudioNext . You can find sample source code to load a filter this way here .

Answer 3

Like Cristian said, people typically register the filter on the system. But I prefer not to do this for a few reasons . In particular, see the section on "Registering Filters with the Operating System."

I think nine times out of ten, you're better off instantiating with new. See AppFilter on Geraint Davis' page for an example.