Creating COM object in Threads

Question

I have a button, behind that button i created a thread,

void FunctionCallingThreadFunction()
{
    AfxBeginThread(MyFunction, NULL);
}

In MyFunction i am creating a COM object, but when I create instance of it, null is returned to me,

MyFunction(LPVOID pvParam)
{
    comObject.CreateInstance(__uuidof(ClassName), NULL, CLSCTX_INPROC_SERVER);
}

But if i create this comObject in origional function it is created fine,

what is problem?,

Luchian Grigore · Accepted Answer · 2012-05-02 12:18:52Z

2

You need to call CoInitialize() in every thread before attempting to create instances.

answered May 2, 2012 at 12:18

Luchian Grigore

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4 Comments

fhnaseer Over a year ago

i have done CoInitialize(NULL); but now i am getting another exception "_com_error at memlory location 0x2321123..",

Luchian Grigore Over a year ago

@fhnaseer you get this on the call to CreateInstance?

fhnaseer Over a year ago

i debugged it, now i came to know that the error is "The application called an interface that was marshalled for a different thread", i think this is due to some complexity in my code,

Luchian Grigore Over a year ago

@fhnaseer that seems to be a different issue.

Nemanja Trifunovic · Accepted Answer · 2012-05-02 12:19:33Z

2

You need to call CoInitializeEx in each thread that uses COM.

answered May 2, 2012 at 12:19

Nemanja Trifunovic

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1 Comment

fhnaseer Over a year ago

i have done CoInitialize(NULL); but now i am getting another exception "_com_error at memlory location 0x2321123..",

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