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

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  • SGaistS SGaist

    So it's a dll you have control over ?

    O Offline
    O Offline
    opengpu
    wrote on last edited by
    #7

    @SGaist better donot change the DLL code...

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #8

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

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • O Offline
        O Offline
        opengpu
        wrote on last edited by
        #9

        @SGaist said in anyone familiar with COM? i met problem when changed project from MFC to Qt:

        CoInitializeEx

        just one time in DLL

        APIImp::~APIImp()
        {
        	release();
        	CoUninitialize();
        }
        
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        • O Offline
          O Offline
          opengpu
          wrote on last edited by
          #10
          class APIImp {
          private:
          DataCOMLib::_DataCOMPtr	m_pData;
          
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          • O Offline
            O Offline
            opengpu
            wrote on last edited by
            #11

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

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            • O Offline
              O Offline
              opengpu
              wrote on last edited by
              #12

              APIImp::release()
              {
              cancelRequest
              Unadvise
              Release

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              • hskoglundH Online
                hskoglundH Online
                hskoglund
                wrote on last edited by
                #13

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

                HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
                qDebug() << hr;
                
                
                O 1 Reply Last reply
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                • hskoglundH hskoglund

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

                  HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
                  qDebug() << hr;
                  
                  
                  O Offline
                  O Offline
                  opengpu
                  wrote on last edited by
                  #14

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

                  mrjjM 1 Reply Last reply
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                  • O opengpu

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

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #15

                    @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?

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                    • O Offline
                      O Offline
                      opengpu
                      wrote on last edited by
                      #16

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

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                      • O Offline
                        O Offline
                        opengpu
                        wrote on last edited by
                        #17

                        anyone familiar ?

                        mrjjM 1 Reply Last reply
                        0
                        • O opengpu

                          anyone familiar ?

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #18

                          @opengpu
                          did you get HRESULT hr out ?

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                          0
                          • mrjjM mrjj

                            @opengpu
                            did you get HRESULT hr out ?

                            O Offline
                            O Offline
                            opengpu
                            wrote on last edited by
                            #19

                            @mrjj HRESULT = -2147417850

                            mrjjM 1 Reply Last reply
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                            • O opengpu

                              @mrjj HRESULT = -2147417850

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #20

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

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                              • aha_1980A Offline
                                aha_1980A Offline
                                aha_1980
                                Lifetime Qt Champion
                                wrote on last edited by
                                #21

                                https://en.m.wikipedia.org/wiki/HRESULT describes tools to decode HRESULTs

                                Qt has to stay free or it will die.

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                                • Christian EhrlicherC Online
                                  Christian EhrlicherC Online
                                  Christian Ehrlicher
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #22

                                  @opengpu said in anyone familiar with COM? i met problem when changed project from MFC to Qt:

                                  -2147417850

                                  = 0x80010106

                                  https://stackoverflow.com/questions/11708497/com-library-initialization-failed-with-code-0x80010106-in-c-sharp

                                  "This is a bug in the DLL you are using. A DLL should never call CoInitializeEx() on a thread that it didn't create. "

                                  Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                                  Visit the Qt Academy at https://academy.qt.io/catalog

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                                  • hskoglundH Online
                                    hskoglundH Online
                                    hskoglund
                                    wrote on last edited by
                                    #23

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

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                                    • O Offline
                                      O Offline
                                      opengpu
                                      wrote on last edited by
                                      #24

                                      0x80010106

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                                      • O Offline
                                        O Offline
                                        opengpu
                                        wrote on last edited by
                                        #25
                                        This post is deleted!
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                                        • O Offline
                                          O Offline
                                          opengpu
                                          wrote on last edited by
                                          #26
                                          #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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