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Editorial Team
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Asked: 2026-05-31T23:43:33+00:00

Can anyone please tell why this error? I have included everything ( all header,

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Can anyone please tell why this error? I have included everything ( all header, sources and form class) in my .pro file

Error message:

debug/moc_calculatorform.o:moc_calculatorform.cpp:(.rdata$_ZTV14CalculatorForm[v‌​table for CalculatorForm]+0xb0):

undefined reference to `CalculatorForm::changeEvent(QEvent*)’
collect2: ld returned 1 exit
status mingw32-make.exe[1]:

[debug\calculatorform.exe] Error 1
mingw32-make.exe:
[debug] Error 2 13:02:27: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2. Error while building project calculatorform (target: Qt Simulator) When executing build step ‘Make’

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1 Answer

  1. Editorial Team

    undefined reference to CalculatorForm::changeEvent(QEvent*)

    There’s your answer, the linker can’t find the definition of this method – you have probably forgotten to implement it.

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