Question

我有一个名为Project的Qt子目录项目。

# Project.pro
TEMPLATE = subdirs

SUBDIRS += \
    Project-core \
    Project-gui


Project-gui.depends = Project-core

Project-gui必须从Project-core调用一个函数，因此我按照website所示链接了项目：

您可以在Qt Creator中右键单击您的项目，然后选择“添加库...”，选择“外部库”并浏览您的库文件：

我这样做了，但是我选择了“内部库”而不是“外部库”。现在，我可以在Project-core中包含Project-gui的头文件，并且将其中一个类标记为Q_DECL_EXPORT。我试图调用此类的（静态）成员函数。但是现在，当我要编译项目时，编译器的输出是一个漫长而复杂的错误消息：

21:14:15: Running steps for project Project...
21:14:15: Configuration unchanged, skipping qmake step.
21:14:15: Starting: "C:\Qt\Qt5.12.1\Tools\mingw730_64\bin\mingw32-make.exe" -j8
cd Project-core\ && ( if not exist Makefile C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -o Makefile C:\Users\Usr\Desktop\Project\Alpha\Project\Project-core\Project-core.pro -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile 
mingw32-make[1]: Entering directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-core'
C:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile.Debug
mingw32-make[2]: Entering directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-core'
mingw32-make[2]: Nothing to be done for 'first'.
mingw32-make[2]: Leaving directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-core'
mingw32-make[1]: Leaving directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-core'
cd Project-gui\ && ( if not exist Makefile C:\Qt\Qt5.12.1\5.12.1\mingw73_64\bin\qmake.exe -o Makefile C:\Users\Usr\Desktop\Project\Alpha\Project\Project-gui\Project-gui.pro -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug" ) && C:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile 
mingw32-make[1]: Entering directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-gui'
C:/Qt/Qt5.12.1/Tools/mingw730_64/bin/mingw32-make -f Makefile.Debug
mingw32-make[2]: Entering directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-gui'
mingw32-make[2]: Nothing to be done for 'first'.
mingw32-make[2]: Leaving directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-gui'
mingw32-make[1]: Leaving directory 'C:/Users/Usr/Desktop/Project/Alpha/Project/Project-gui'
21:14:20: The process "C:\Qt\Qt5.12.1\Tools\mingw730_64\bin\mingw32-make.exe" exited normally.
21:14:20: Elapsed time: 00:05.

如果我不调用该函数，该错误就会消失。我在做什么错了？

Answer 1

将Q_DECL_EXPORT（或PROJECTCORESHARED_EXPORT）添加到该方法使用的所有类中，即可解决此问题。

如何在子目录项目中调用共享的类成员函数？

1 个答案: