unresolved external symbol

Nevez

I have a lib file called components and I have a file named example where I use this file.
I get this error.

iconbuttonsettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
appbarsettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
avatarsettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
badgesettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
fabsettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
flatbuttonsettingseditor.obj : error LNK2001: unresolved external symbol "public: static class QIcon __cdecl QtMaterialTheme::icon(class QString,class QString)" (?icon@QtMaterialTheme@@SA?AVQIcon@@VQString@@0@Z)
avatarsettingseditor.obj : error LNK2019: unresolved external symbol "public: __cdecl QtMaterialAvatar::QtMaterialAvatar(class QChar const &,class QWidget *)" (??0QtMaterialAvatar@@QEAA@AEBVQChar@@PEAVQWidget@@@Z) referenced in function "public: __cdecl AvatarSettingsEditor::AvatarSettingsEditor(class QWidget *)" (??0AvatarSettingsEditor@@QEAA@PEAVQWidget@@@Z)
avatarsettingseditor.obj : error LNK2019: unresolved external symbol "public: void __cdecl QtMaterialAvatar::setUseThemeColors(bool)" (?setUseThemeColors@QtMaterialAvatar@@QEAAX_N@Z) referenced in function "protected: void __cdecl AvatarSettingsEditor::updateWidget(void)" (?updateWidget@AvatarSettingsEditor@@IEAAXXZ)

Example.pro file:

LIBS += C:/Users/Bim_Desktop2/Desktop/qt-material-widgets-master/qt-material-widgets-master/components/debug/libcomponents.a
INCLUDEPATH += $$top_srcdir/components/
TARGET = examples-exe
PRE_TARGETDEPS += $$top_builddir/components/$(OBJECTS_DIR)/libcomponents.a

whats the problem ?

Christian Ehrlicher

Do you properly export the QtMaterialTheme class?

Nevez

This post is deleted!

Christian Ehrlicher

@Nevez said in unresolved external symbol:

yes, I think it was exported

And why do you show me an object file? Did you even read the link I gave you?

Nevez

I could not see any statement about export in the header files in the Components section.

#include <QWidget>

#if defined MAKE_TEST_LIB
    #define TEST_LIB_EXPORT Q_DECL_EXPORT
#else
    #define TEST_LIB_EXPORT Q_DECL_IMPORT
#endif
    
class TEST_LIB_EXPORT Widget : public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *parent = nullptr);
};

the creator of the project did not use such a statement in the header files.

However, when I compile it with mingw, a lib file with .a extension still occurs. I found this project from github and I want to run i

Nevez

LIBS += -L"C:/Users/Bim_Desktop2/Desktop/qt-material-widgets-master/qt-material-widgets-master/components/debug/" -llibcomponents.a

This is how I changed the definition in my .pro file and it gave this error

:-1: error: LNK1104: cannot open file 'libcomponents.a.lib'

JonB

@Nevez said in unresolved external symbol:

-llibcomponents.a

That is a MinGW library. Are you using the MSVC compiler/linker??

error: LNK1104

Yes, you are!

Nevez

yes I noticed that too. I ran it with mingw. It gave this error.
Can you help me how exactly should I specify the path?

:-1: error: cannot find -llibcomponents.a

JonB

@Nevez
I don't use any of this (not PC). Start by seeing what MinGW linker wants for a library. You have written -llibcomponents.a; for all I know it should actually be -lcomponents or something. (Don't guess: look it up.) And make sure the LIBS path to find it is correct.