On Fri, Mar 08, 2024 at 07:28:08AM +0800, ogre up wrote:
> Hi all,
> I want to implement a qt creator plug-in that can read specified
> variables (such as a vector with more elements) from the debugger, and
> then export the variable values to a text file.
> Currently, simple sample plug-ins can be compiled and loaded according
> to the qt creator wizard (using qt creator 4.12.4/Qt 5.14.2/vs2017
> build tools), but when trying to use the Debugger class, a compilation
> error will appear, prompting an unresolved external symbol. I tried
> adding a dependency on debugger in the pro file, but it didn't seem to
> have any effect.
> complier error message as follows:
> example.obj : error LNK2019: Unresolved external symbol "public: static
> class QPointer<class Debugger::Internal::DebuggerEngine> __cdecl
> Debugger::Internal::EngineManager::currentEngine(void)"
> (?currentEngine@EngineManager@Internal
> @Debugger@@SA?AV?$QPointer@VDebuggerEngine@Internal@Debugger@@@@XZ),
> this symbol is in the function "private: void __cdecl
> Example::Internal::ExamplePlugin::triggerAction(void)" (?triggerAction@
> Referenced in ExamplePlugin@Internal@Example@@AEAAXXZ)
> ..\..\..\..\Qt\qtcreator-4.12.4\lib\qtcreator\plugins\Example4.dll :
> fatal error LNK1120: 1 unresolved external command
> some of the source code as follows:
> void ExamplePlugin::triggerAction()
> {
> QMessageBox::information(Core::ICore::mainWindow(),
> tr("Action Triggered"),
> tr("This is an action from Example."));
> Debugger::Internal::DebuggerEngine *engine =
> Debugger::Internal::EngineManager::currentEngine();
> if (engine)
> {
> // try fetch variable by name, and dump it's values to text
> file ...
> }
> }
> and lib dependency settings in pro file:
> --------------------------------------------
> QTC_PLUGIN_NAME = Example
> QTC_LIB_DEPENDS += \
> # nothing here at this time
> QTC_PLUGIN_DEPENDS += \
> coreplugin \
> debugger \
> projectexplorer
> QTC_PLUGIN_RECOMMENDS += \
> # optional plugin dependencies. nothing here at this time
> -----------------------------------------------------------------------
> ---
> I would like to know:
> 1. How to solve the above compilation error?
> 2. To achieve the function I want, what code snippets can I refer to?
> Any suggestion would be appreciated.
The '::Internal' in Debugger::Internal:: is the sign that this is not an
exported class, i.e. not meant for public consumption or re-use, i.e.
you cannot use this from outside the debugger plugin itself.
As a non-recommended solution, to make this work, you could add
DEBUGGER_EXPORT to Debugger::Internal::EngineManager in a local build
of Qt Creator and go from there.
However, I think that having a way to export vector data to a file from the
debugger (e.g. via a context menu entry in the "Locals" pane) would be a good
feature to have in general, so I'd suggest to implement this directly in the
regular debugger plugin, either via a patch submitted by you on
codereview.qt-project.org (preferred) or as a feature request on
bugreports.qt.io.
Andre'
--
Qt-creator mailing list
Qt-creator@qt-project.org
https://lists.qt-project.org/listinfo/qt-creator
