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How to use QT signals and slots in QGIS C++ API
The Next CEO of Stack OverflowWhat are the differences between a pointer variable and a reference variable in C++?How do I iterate over the words of a string?How can I profile C++ code running on Linux?The Definitive C++ Book Guide and ListWhat is the “-->” operator in C++?Link error with C++ class and test.cpp and Opencv libsDefining Inline function outside the class body, in .cppVS2010 & LNK2001 error for Q_OBJECT macrosignal slot custom struct issueLNK2019: Unresolved External Symbol in OpenCV
I'm developing a standalone QT 5.11.2 application using QGIS 3.6 C++ API.
I have defined a slot that is meant to consume a currentLayerChanged(QgsMapLayer * layer) signal.
The slot declaration in the header file is:
private slots:
void on_CurrentLayer_changed(QgsMapLayer *layer);
The slot definition is:
void MainWindow::on_CurrentLayer_changed(QgsMapLayer * layer)
// do something here
When I try to build I get a linker error:
moc_mainwindow.obj:-1: error: LNK2019: símbolo externo "public: static struct QMetaObject const QgsMapLayer::staticMetaObject" (?staticMetaObject@QgsMapLayer@@2UQMetaObject@@B) sin resolver al que se hace referencia en la función "int __cdecl qRegisterMetaType<class QgsMapLayer *>(char const *,class QgsMapLayer * *,enum QtPrivate::MetaTypeDefinedHelper<class QgsMapLayer *,1>::DefinedType)" (??$qRegisterMetaType@PEAVQgsMapLayer@@@@YAHPEBDPEAPEAVQgsMapLayer@@W4DefinedType@?$MetaTypeDefinedHelper@PEAVQgsMapLayer@@$00@QtPrivate@@@Z)
File not found: moc_mainwindow.obj
error: LNK1120: 1 externos sin resolver
Should I subclass any of the classes that emit the signal currentLayerChanged(QgsMapLayer * layer) to define the slot?
c++ qt qgis
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
add a comment |
I'm developing a standalone QT 5.11.2 application using QGIS 3.6 C++ API.
I have defined a slot that is meant to consume a currentLayerChanged(QgsMapLayer * layer) signal.
The slot declaration in the header file is:
private slots:
void on_CurrentLayer_changed(QgsMapLayer *layer);
The slot definition is:
void MainWindow::on_CurrentLayer_changed(QgsMapLayer * layer)
// do something here
When I try to build I get a linker error:
moc_mainwindow.obj:-1: error: LNK2019: símbolo externo "public: static struct QMetaObject const QgsMapLayer::staticMetaObject" (?staticMetaObject@QgsMapLayer@@2UQMetaObject@@B) sin resolver al que se hace referencia en la función "int __cdecl qRegisterMetaType<class QgsMapLayer *>(char const *,class QgsMapLayer * *,enum QtPrivate::MetaTypeDefinedHelper<class QgsMapLayer *,1>::DefinedType)" (??$qRegisterMetaType@PEAVQgsMapLayer@@@@YAHPEBDPEAPEAVQgsMapLayer@@W4DefinedType@?$MetaTypeDefinedHelper@PEAVQgsMapLayer@@$00@QtPrivate@@@Z)
File not found: moc_mainwindow.obj
error: LNK1120: 1 externos sin resolver
Should I subclass any of the classes that emit the signal currentLayerChanged(QgsMapLayer * layer) to define the slot?
c++ qt qgis
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe theQ_OBJECTmacro is missing.
– Korni
Mar 8 at 14:04
Do I have to compile the header? Doesn't Qt handle this automatically? TheQ_OBJECTmacro is included in the header file. Is a regularMainWindowclass.
– Diego Sartori
Mar 14 at 11:31
add a comment |
I'm developing a standalone QT 5.11.2 application using QGIS 3.6 C++ API.
I have defined a slot that is meant to consume a currentLayerChanged(QgsMapLayer * layer) signal.
The slot declaration in the header file is:
private slots:
void on_CurrentLayer_changed(QgsMapLayer *layer);
The slot definition is:
void MainWindow::on_CurrentLayer_changed(QgsMapLayer * layer)
// do something here
When I try to build I get a linker error:
moc_mainwindow.obj:-1: error: LNK2019: símbolo externo "public: static struct QMetaObject const QgsMapLayer::staticMetaObject" (?staticMetaObject@QgsMapLayer@@2UQMetaObject@@B) sin resolver al que se hace referencia en la función "int __cdecl qRegisterMetaType<class QgsMapLayer *>(char const *,class QgsMapLayer * *,enum QtPrivate::MetaTypeDefinedHelper<class QgsMapLayer *,1>::DefinedType)" (??$qRegisterMetaType@PEAVQgsMapLayer@@@@YAHPEBDPEAPEAVQgsMapLayer@@W4DefinedType@?$MetaTypeDefinedHelper@PEAVQgsMapLayer@@$00@QtPrivate@@@Z)
File not found: moc_mainwindow.obj
error: LNK1120: 1 externos sin resolver
Should I subclass any of the classes that emit the signal currentLayerChanged(QgsMapLayer * layer) to define the slot?
c++ qt qgis
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
I'm developing a standalone QT 5.11.2 application using QGIS 3.6 C++ API.
I have defined a slot that is meant to consume a currentLayerChanged(QgsMapLayer * layer) signal.
The slot declaration in the header file is:
private slots:
void on_CurrentLayer_changed(QgsMapLayer *layer);
The slot definition is:
void MainWindow::on_CurrentLayer_changed(QgsMapLayer * layer)
// do something here
When I try to build I get a linker error:
moc_mainwindow.obj:-1: error: LNK2019: símbolo externo "public: static struct QMetaObject const QgsMapLayer::staticMetaObject" (?staticMetaObject@QgsMapLayer@@2UQMetaObject@@B) sin resolver al que se hace referencia en la función "int __cdecl qRegisterMetaType<class QgsMapLayer *>(char const *,class QgsMapLayer * *,enum QtPrivate::MetaTypeDefinedHelper<class QgsMapLayer *,1>::DefinedType)" (??$qRegisterMetaType@PEAVQgsMapLayer@@@@YAHPEBDPEAPEAVQgsMapLayer@@W4DefinedType@?$MetaTypeDefinedHelper@PEAVQgsMapLayer@@$00@QtPrivate@@@Z)
File not found: moc_mainwindow.obj
error: LNK1120: 1 externos sin resolver
Should I subclass any of the classes that emit the signal currentLayerChanged(QgsMapLayer * layer) to define the slot?
c++ qt qgis
c++ qt qgis
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
asked Mar 8 at 12:50
Diego SartoriDiego Sartori
13
13
Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe theQ_OBJECTmacro is missing.
– Korni
Mar 8 at 14:04
Do I have to compile the header? Doesn't Qt handle this automatically? TheQ_OBJECTmacro is included in the header file. Is a regularMainWindowclass.
– Diego Sartori
Mar 14 at 11:31
add a comment |
Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe theQ_OBJECTmacro is missing.
– Korni
Mar 8 at 14:04
Do I have to compile the header? Doesn't Qt handle this automatically? TheQ_OBJECTmacro is included in the header file. Is a regularMainWindowclass.
– Diego Sartori
Mar 14 at 11:31
Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe the
Q_OBJECT macro is missing.– Korni
Mar 8 at 14:04
Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe the
Q_OBJECT macro is missing.– Korni
Mar 8 at 14:04
Do I have to compile the header? Doesn't Qt handle this automatically? The
Q_OBJECT macro is included in the header file. Is a regular MainWindow class.– Diego Sartori
Mar 14 at 11:31
Do I have to compile the header? Doesn't Qt handle this automatically? The
Q_OBJECT macro is included in the header file. Is a regular MainWindow class.– Diego Sartori
Mar 14 at 11:31
add a comment |
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Seems like you didn't compiled the header with the Qt Meta Object Compile (MOC) ? If not so maybe the
Q_OBJECTmacro is missing.– Korni
Mar 8 at 14:04
Do I have to compile the header? Doesn't Qt handle this automatically? The
Q_OBJECTmacro is included in the header file. Is a regularMainWindowclass.– Diego Sartori
Mar 14 at 11:31