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  1. Qt
  2. QTBUG-55080

Run-time error "Type mismatch" with getting dispatch interface

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P4: Low P4: Low
    • None
    • 5.7.0
    • ActiveX Support
    • None
    • QT 5.7, CPPTOOLS 4.0.3, Windows 7 x86

      I attached 7z archive:
      1. dumpcppBug - qt 5.7 sample project
      2. testCOM - test VS2012 project with release testCOM.dll

      Code snippet:

         //COM interface:
//
//interface ITest2 : IDispatch{
//	[id(1),  helpstring("method foo")]     HRESULT foo    ( [out,retval] INT* ret );
//};
//
//interface ITest : IDispatch{
//  ...
//	[id(8),  helpstring("method foo2")]   HRESULT foo2  ( [out] ITest2** iTest2, [out,retval] INT* ret );
//};

//Namespace testCOMLib generated by dumpcpp v5.7.0 using
   testCOMLib::Test test;
   testCOMLib::ITest2 *pitest2 = nullptr;
   // inline int Test::foo2(ITest2** ITest2)
   auto res = test.foo2(&pitest2); // <--

      QT Debugger log:

      Debugging starts
QAxBase: Error calling IDispatch member foo2: Type mismatch in parameter 0
Debugging has finished

      DISP_E_TYPEMISMATCH emitted from checkHRESULT() qtactiveqt\src\activeqt\container\qaxbase.cpp:3446 .

        1. dumpcppBug.7z
          24 kB
          Valera G
        2. qtbug55080.zip
          36 kB
          Friedemann Kleint
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            kleint Friedemann Kleint
            valera_ Valera G
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              Created:
              Updated:

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