is there anyone familiar with COM? I met problem when changed project from MFC to Qt

SGaist

So it's a dll you have control over ?

opengpu

yes, i have the dll project, and i added that assert.
but i donot think i can change the code.

opengpu

why CoInitializeEx fail in tha DLL? it works in MFC app, and i also donot see anything init or special work.
sorry, i am not quite familia with COM

opengpu

@SGaist better donot change the DLL code...

SGaist

Do you have several calls to CoInitializeEx ?
Are you properly calling CoUninitialize when you're done with your COM stuff ?

opengpu

CoInitializeEx

just one time in DLL

APIImp::~APIImp()
{
	release();
	CoUninitialize();
}

opengpu

class APIImp {
private:
DataCOMLib::_DataCOMPtr	m_pData;

opengpu

CppAPIImp::initialize()
{
CreateInstance(__uuidof(DataCOMLib::DataCOM), NULL, CLSCTX_ALL);
QueryInterface
FindConnectionPoint
QueryInterface
Advise

opengpu

APIImp::release()
{
cancelRequest
Unadvise
Release

hskoglund

Hi, what error do you get from your CoInitializeEx() call? Try something like:

HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
qDebug() << hr;

opengpu

@hskoglund that DLL with COM is not Qt program...

mrjj

@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?

opengpu

the DLL is the same...
and i wiil log out the errorcode

opengpu

anyone familiar ?

mrjj

@opengpu
did you get HRESULT hr out ?

opengpu

@mrjj HRESULT = -2147417850

mrjj

@opengpu
ok. super. Hopefully mr hskoglund can get something out of that.

aha_1980

Christian Ehrlicher

-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. "

hskoglund

Hi, what happens to your .DLL if you skip (comment out) the call to CoInitializeEx()?