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

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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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      0
      • 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 ?

          O 1 Reply Last reply
          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 Offline
                  Christian EhrlicherC Offline
                  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()?

                    O 1 Reply Last reply
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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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                          0
                          • O Offline
                            O Offline
                            opengpu
                            wrote on last edited by
                            #27
                            APIImp::APIImp()
                            {
                            	//if(!SUCCEEDED(CoInitialize(NULL)))
                            	HRESULT ret = CoInitializeEx(NULL, COINIT_MULTITHREADED);
                            	if(!SUCCEEDED(ret))
                            	{
                            		//return;
                            	}
                            
                            	initialize();
                            }
                            
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                            • hskoglundH hskoglund

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

                              O Offline
                              O Offline
                              opengpu
                              wrote on last edited by
                              #28

                              @hskoglund why you asked this question?
                              i didnot return when failed to CoInitializeEx(NULL, COINIT_MULTITHREADED);
                              it seems worked...

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                              • O Offline
                                O Offline
                                opengpu
                                wrote on last edited by
                                #29
                                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.

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