c# - AccessViolationException occured using P/Invoke with Media Foundation Interface in Multithread application -


i'm using p/invoke in c# call native function c++ dll below:

  1. c++ dll:

        extern "c"     {         // function: create wmv video sequences image. codec: wmv3 (vc-1)         __declspec(dllexport) bool __stdcall createwmv(...)         {         ...         }     }

  2. c# wrapper class. create c# wrapper class function map native c++ code:

        [dllimport("aviencoder.dll", entrypoint = "createwmv", charset = charset.unicode, callingconvention = callingconvention.stdcall)]     [return: marshalas(unmanagedtype.bool)]     public static extern bool createwmv(...);

i'm sure parameters marshaling correctly in c#, because run when called directly in client c# code. issue occurred when put function in background thread.

private void test() { .... createwmv(...); // call processed without issue thread backgroundthread = new thread(     new threadstart(()=>     {         createwmv(...); // call causes accessviolationexception     } }

the function createwmv() uses media foundation interface generate wmv video. tried debug , found out when commented out function imfsinkwriter::writesample() in native code, program run without causing exception.

thus, wonder whether microsoft has weird in sinkwriter implementation. have same issue using media foundation way?

follow oleksii's comment, set below:

backgroundthread.trysetapartmentstate(apartmentstate.sta); // add fix createwmv() in multithreading backgroundthread.name = "createvideothead"; backgroundthread.start();

now, program run without exception. concept of apartmentstate in c# threading.


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