Building DirectShow Filters

To build a DirectShow filter, perform the steps listed in Building DirectShow Applications. In addition, perform the following steps:

• Use the __stdcall calling convention.
• Set the entry-point symbol to DllEntryPoint@12. (In Microsoft® Visual C++® 6.0, choose Settings from the Project menu. Click the Link tab. In the Category list, click Output. Type DllEntryPoint@12 in the Entry-point Symbol box.)
• Use the multithreaded C run-time library.
• Include a definition (.def) file that exports the DLL functions. The following is an example of a definition file. The filter's output file is assumed to be Filter.dll.

LIBRARY FILTER.DLL
DESCRIPTION 'Description of my filter'
PROTMODE
EXPORTS 
    DllGetClassObject  
    DllCanUnloadNow  
    DllRegisterServer  
    DllUnregisterServer 

See Also

• Building with the Base Class Library