Hey there, let's tackle those undefined reference to _imp___ZN8QtCharts* errors you're seeing—this is a super common issue when working with QtCharts, and it's almost always a linker configuration problem, not an issue with your QList/QVector switch.

Here's how to fix it step by step:

1. Update Your Project's .pro File #

QtCharts isn't linked into your project by default—you have to explicitly tell Qt to include it. Open your .pro file and add this line:

QT += charts

This tells qmake to link against the QtCharts libraries during the build process, which will resolve those missing references.

2. Verify Header Includes #

Make sure you're including the QtCharts headers correctly in sixthpage.cpp:

• For Qt 5, use fully qualified includes (or enable the namespace):

  // Option 1: Fully qualified path
  #include <QtCharts/QBarSet>
  #include <QtCharts/QBarSeries>
  // ... other QtCharts headers you need
  
  // Option 2: Use the namespace (add this after includes)
  using namespace QtCharts;
  

• For Qt 6, the headers are simpler since the module is more integrated, but you still need QT += charts in your .pro:

  #include <QBarSet>
  #include <QBarSeries>
  

3. Clean and Rebuild Your Project #

After updating the .pro file, old build artifacts might cause issues. Do this in Qt Creator:

• Click Build > Run qmake to regenerate the makefile with the new QtCharts dependency.
• Click Build > Clean All to remove old object files.
• Finally, click Build > Build All to rebuild from scratch.

4. Check Compiler/Qt Version Compatibility #

Ensure you're using the same compiler that your Qt installation was built with. For example:

• If you installed Qt with MinGW, don't try to build with MSVC (and vice versa). Mismatched compilers will lead to linker errors like this, even if your code is correct.

That should wipe out all those 58 undefined reference errors. The QList/QVector switch was just a red herring—this is all about getting the QtCharts module properly linked into your project.

内容的提问来源于stack exchange，提问作者Asad Nawaz