call prompt service dynamically

[Tobias Wolf]

I try to call this code dynamically: 

nsCOMPtr<nsIPromptService> promptService = 
do_GetService("@mozilla.org/embedcomp/prompt-service;1"));
        promptService->Alert(NULL, NULL, NULL);

I do the following:

        nsISomeInterface* mXPTCStub;
        nsresult rc;
        nsXPTCVariant params[3];

        rc = NS_GetXPTCallStub(NS_IPROMPTSERVICE_IID, proxy, &mXPTCStub);

        params[0].val.p = NULL;
        params[0].type = nsXPTType::T_VOID;
        params[0].flags = 0;

        params[1].val.p = (void*)title;
        params[1].type = nsXPTType::T_CHAR_STR;
        params[1].flags = 0;

        params[2].val.p = (void*)text;
        params[2].type = nsXPTType::T_CHAR_STR;
        params[2].flags = 0;

        rc = NS_InvokeByIndex(mXPTCStub, 1, 3, params);
        NS_DestroyXPTCallStub(mXPTCStub);

But I don`t know how to use NS_GetXPTCallStub!
What means the second and third parameter from NS_GetXPTCallStub?
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