Using COM(ActiveX?) hangs up

[gri]

Hello,

First of all: The examples of ActiveQt do all do their work

Now to my problem: I'm trying to access a remote application, which results in a hangup ... maybe someone can tell me why
The querySubObject() causes the problem ... If disableMetaObject() is set, it does not hang up .. while calling this function inventor takes up 100% cpu

CLSID clsid;
  ::CLSIDFromProgID(L"Inventor.Application", &clsid);
 
  IUnknown* unk = NULL;
  if ( SUCCEEDED(::GetActiveObject(clsid, NULL, &unk)) )
  {
    QAxObject inventor(unk);
    QAxObject* pDocuments = inventor.querySubObject("Documents"); // hangs up
    if ( pDocuments )
    {
      //...
    }
 
    unk->Release();
  }

CLSID clsid;
  ::CLSIDFromProgID(L"Inventor.Application", &clsid);

  IUnknown* unk = NULL;
  if ( SUCCEEDED(::GetActiveObject(clsid, NULL, &unk)) )
  {
    QAxObject inventor(unk);
    QAxObject* pDocuments = inventor.querySubObject("Documents"); // hangs up
    if ( pDocuments )
    {
      //...
    }

    unk->Release();
  }

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[wysota]

What if you break and debug? Does it freeze inside Qt code, your code or COM code?

[gri]

not really debugable ... none of the threads stops somewhere meaningful ...

I found that the calls don't hang up. But each call takes about 20+ seconds!! While that Inventor does not hang up and still works with 100% cpu usage ...

So how to get the calls do their work faster? I don't need a function list of the object, I know which functions to call ..

[gri]

Ok, after trying:

with disableMetaObject() and dynamicCall() everything works fast ... but setting this on each object is really annoying

[wysota]

Are you using debug or release mode?

How about using QAxBase::queryInterface() to ask for an interface that would return return an interface you might call directly? I don't know if it's possible with the COM server you want, but omitting creation of QAxObject should speed things up.