Unsolved is there anyone familiar with COM? I met problem when changed project from MFC to Qt
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CppAPIImp::initialize()
{
CreateInstance(__uuidof(DataCOMLib::DataCOM), NULL, CLSCTX_ALL);
QueryInterface
FindConnectionPoint
QueryInterface
Advise -
APIImp::release()
{
cancelRequest
Unadvise
Release -
Hi, what error do you get from your CoInitializeEx() call? Try something like:
HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED); qDebug() << hr;
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@hskoglund that DLL with COM is not Qt program...
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@opengpu
Hi
then use std::cout to show the HRESULT.
It can give hints about why its not loading,.What im a bit puzzled about if that is the same DLL used in the MFC app, and you did not change
the actual DLL code. why should it then stop working? -
the DLL is the same...
and i wiil log out the errorcode -
anyone familiar ?
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@opengpu
did you get HRESULT hr out ? -
@mrjj HRESULT = -2147417850
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@opengpu
ok. super. Hopefully mr hskoglund can get something out of that. -
https://en.m.wikipedia.org/wiki/HRESULT describes tools to decode HRESULTs
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@opengpu said in anyone familiar with COM? i met problem when changed project from MFC to Qt:
-2147417850
= 0x80010106
"This is a bug in the DLL you are using. A DLL should never call CoInitializeEx() on a thread that it didn't create. "
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Hi, what happens to your .DLL if you skip (comment out) the call to CoInitializeEx()?
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0x80010106
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This post is deleted! -
#include "stdafx.h" BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: break; } return TRUE; }
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APIImp::APIImp() { //if(!SUCCEEDED(CoInitialize(NULL))) HRESULT ret = CoInitializeEx(NULL, COINIT_MULTITHREADED); if(!SUCCEEDED(ret)) { //return; } initialize(); }
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@hskoglund why you asked this question?
i didnot return when failed to CoInitializeEx(NULL, COINIT_MULTITHREADED);
it seems worked... -
APIImp::APIImp() { //if(!SUCCEEDED(CoInitialize(NULL))) HRESULT ret = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED); if(!SUCCEEDED(ret)) { return; } initialize(); }
i use COINIT_APARTMENTTHREADED instead of COINIT_MULTITHREADED, and this works fine for me.