using a custom widget

**GrahamLabdon** · 21st March 2011, 15:38

Header File

Qt Code:

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#ifndef MYCUSTOMWIDGET_H
#define MYCUSTOMWIDGET_H
 
#include <QtGui/QWidget>
 
class MyCustomWidget : public QWidget
{
    Q_OBJECT
 
public:
    MyCustomWidget(QWidget *parent = 0);
};
 
#endif

#ifndef MYCUSTOMWIDGET_H
#define MYCUSTOMWIDGET_H

#include <QtGui/QWidget>

class MyCustomWidget : public QWidget
{
    Q_OBJECT

public:
    MyCustomWidget(QWidget *parent = 0);
};

#endif

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cpp

Qt Code:

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#include "MyCustomWidget.h"
 
MyCustomWidget::MyCustomWidget(QWidget *parent) :
    QWidget(parent)
{
}

#include "MyCustomWidget.h"

MyCustomWidget::MyCustomWidget(QWidget *parent) :
    QWidget(parent)
{
}

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Thanks for your help!

**high_flyer** · 21st March 2011, 15:45

ok, show the include section of ui_MainWindow.h

**GrahamLabdon** · 21st March 2011, 15:48

Here ya go

Qt Code:

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#ifndef UI_MAINWINDOW_H
#define UI_MAINWINDOW_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QHeaderView>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QStatusBar>
#include <QtGui/QToolBar>
#include <QtGui/QWidget>
#include "MyCustomWidget.h"

#ifndef UI_MAINWINDOW_H
#define UI_MAINWINDOW_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QHeaderView>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QStatusBar>
#include <QtGui/QToolBar>
#include <QtGui/QWidget>
#include "MyCustomWidget.h"

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**high_flyer** · 21st March 2011, 15:55

and the custom widget header is under C:/QTProjects/MyCustomWidget?
Then I don't see where the problem is...

**GrahamLabdon** · 21st March 2011, 15:57

I found this link
http://stackoverflow.com/questions/2...491825#2491825
But don't really know how to create the other lib

**high_flyer** · 21st March 2011, 16:03

you are getting a compile error, not a link error.
You have a definitive path problem that's all, I just can't tell where.
What is said in that post you linked to is not correct.
I link my apps to my custom widgets against their designer plugin dll with no problem.

**GrahamLabdon** · 21st March 2011, 16:17

Hi
Im not certain that its a compiler error
Here is the output from the build

Qt Code:

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Running build steps for project cccc...
Starting: "C:/mingw/bin/mingw32-make.exe" clean -w
mingw32-make: Entering directory `C:/QTProjects/cccc-build-desktop'
 
C:/mingw/bin/mingw32-make -f Makefile.Release clean
 
mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'
 
del release\moc_MainWindow.cpp
 
del ui_MainWindow.h
 
del release\main.o release\MainWindow.o release\moc_MainWindow.o
 
mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'
 
C:/mingw/bin/mingw32-make -f Makefile.Debug clean
 
mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'
 
del debug\moc_MainWindow.cpp
 
del ui_MainWindow.h
 
del debug\main.o debug\MainWindow.o debug\moc_MainWindow.o
 
mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'
 
mingw32-make: Leaving directory `C:/QTProjects/cccc-build-desktop'
 
Could Not Find C:\QTProjects\cccc-build-desktop\debug\moc_MainWindow.cpp
 
Could Not Find C:\QTProjects\cccc-build-desktop\ui_MainWindow.h
 
Could Not Find C:\QTProjects\cccc-build-desktop\debug\main.o
 
The process "C:/mingw/bin/mingw32-make.exe" exited normally.
Configuration unchanged, skipping qmake step.
Starting: "C:/mingw/bin/mingw32-make.exe" -w
mingw32-make: Entering directory `C:/QTProjects/cccc-build-desktop'
 
C:/mingw/bin/mingw32-make -f Makefile.Release
 
mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'
 
c:\Qt\4.7.2\bin\uic.exe ..\cccc\MainWindow.ui -o ui_MainWindow.h
 
g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\main.o ..\cccc\main.cpp
 
g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\MainWindow.o ..\cccc\MainWindow.cpp
 
C:\Qt\4.7.2\bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -D__GNUC__ -DWIN32 ..\cccc\MainWindow.h -o release\moc_MainWindow.cpp
 
g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\moc_MainWindow.o release\moc_MainWindow.cpp
 
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows -o release\cccc.exe release/main.o release/MainWindow.o release/moc_MainWindow.o  -L"c:\Qt\4.7.2\lib" -lmingw32 -lqtmain C:/QTProjects/MyCustomWidget-build-desktop/release/mycustomwidgetplugin.dll -lQtGui4 -lQtCore4 
 
mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'
 
mingw32-make: Leaving directory `C:/QTProjects/cccc-build-desktop'
 
release/MainWindow.o:MainWindow.cpp:(.text$_ZN13Ui_MainWindow7setupUiEP11QMainWindow[Ui_MainWindow::setupUi(QMainWindow*)]+0x129): undefined reference to `MyCustomWidget::MyCustomWidget(QWidget*)'
 
collect2: ld returned 1 exit status
 
mingw32-make[1]: *** [release\cccc.exe] Error 1
 
mingw32-make: *** [release] Error 2
 
The process "C:/mingw/bin/mingw32-make.exe" exited with code %2.
Error while building project cccc (target: Desktop)
When executing build step 'Make'

Running build steps for project cccc...
Starting: "C:/mingw/bin/mingw32-make.exe" clean -w
mingw32-make: Entering directory `C:/QTProjects/cccc-build-desktop'

C:/mingw/bin/mingw32-make -f Makefile.Release clean

mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'

del release\moc_MainWindow.cpp

del ui_MainWindow.h

del release\main.o release\MainWindow.o release\moc_MainWindow.o

mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'

C:/mingw/bin/mingw32-make -f Makefile.Debug clean

mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'

del debug\moc_MainWindow.cpp

del ui_MainWindow.h

del debug\main.o debug\MainWindow.o debug\moc_MainWindow.o

mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'

mingw32-make: Leaving directory `C:/QTProjects/cccc-build-desktop'

Could Not Find C:\QTProjects\cccc-build-desktop\debug\moc_MainWindow.cpp

Could Not Find C:\QTProjects\cccc-build-desktop\ui_MainWindow.h

Could Not Find C:\QTProjects\cccc-build-desktop\debug\main.o

The process "C:/mingw/bin/mingw32-make.exe" exited normally.
Configuration unchanged, skipping qmake step.
Starting: "C:/mingw/bin/mingw32-make.exe" -w
mingw32-make: Entering directory `C:/QTProjects/cccc-build-desktop'

C:/mingw/bin/mingw32-make -f Makefile.Release

mingw32-make[1]: Entering directory `C:/QTProjects/cccc-build-desktop'

c:\Qt\4.7.2\bin\uic.exe ..\cccc\MainWindow.ui -o ui_MainWindow.h

g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\main.o ..\cccc\main.cpp

g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\MainWindow.o ..\cccc\MainWindow.cpp

C:\Qt\4.7.2\bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -D__GNUC__ -DWIN32 ..\cccc\MainWindow.h -o release\moc_MainWindow.cpp

g++ -c -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\4.7.2\include\QtCore" -I"..\..\Qt\4.7.2\include\QtGui" -I"..\..\Qt\4.7.2\include" -I"..\MyCustomWidget" -I"..\..\Qt\4.7.2\include\ActiveQt" -I"release" -I"." -I"..\cccc" -I"." -I"..\..\Qt\4.7.2\mkspecs\win32-g++" -o release\moc_MainWindow.o release\moc_MainWindow.cpp

g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows -o release\cccc.exe release/main.o release/MainWindow.o release/moc_MainWindow.o  -L"c:\Qt\4.7.2\lib" -lmingw32 -lqtmain C:/QTProjects/MyCustomWidget-build-desktop/release/mycustomwidgetplugin.dll -lQtGui4 -lQtCore4 

mingw32-make[1]: Leaving directory `C:/QTProjects/cccc-build-desktop'

mingw32-make: Leaving directory `C:/QTProjects/cccc-build-desktop'

release/MainWindow.o:MainWindow.cpp:(.text$_ZN13Ui_MainWindow7setupUiEP11QMainWindow[Ui_MainWindow::setupUi(QMainWindow*)]+0x129): undefined reference to `MyCustomWidget::MyCustomWidget(QWidget*)'

collect2: ld returned 1 exit status

mingw32-make[1]: *** [release\cccc.exe] Error 1

mingw32-make: *** [release] Error 2

The process "C:/mingw/bin/mingw32-make.exe" exited with code %2.
Error while building project cccc (target: Desktop)
When executing build step 'Make'

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Does this help you locate the problem?

**high_flyer** · 21st March 2011, 16:24

The error you posted now is a link error.

elease/MainWindow.o:MainWindow.cpp

.text$_ZN13Ui_MainWindow7setupUiEP11QMainWindow[Ui_MainWindow::setupUi(QMainWindow*)]+0x129): undefined reference to `MyCustomWidget::MyCustomWidget(QWidget*)'

But error you posted at the beginngin of this thread was a compile error:

debug/MainWindow.o:C:\QTProjects\cccc-build-desktop/./ui_MainWindow.h:43: undefined reference to `MyCustomWidget::MyCustomWidget(QWidget*)'

You have to be a bit more cooperative if you want effective help.

Your link line is not good:

-L"c:\Qt\4.7.2\lib" -lmingw32 -lqtmain C:/QTProjects/MyCustomWidget-build-desktop/release/mycustomwidgetplugin.dll -lQtGui4 -lQtCore4

'-l' is missing before 'C:/QTProjects/MyCustomWidget-build-desktop/release/mycustomwidgetplugin.dll'

**GrahamLabdon** · 21st March 2011, 16:27

Hi
Sorry if there has been some confusion
I had already tried '-l'
It gives this error

c:/mingw/bin/../lib/gcc/mingw32/4.4.0/../../../../mingw32/bin/ld.exe: cannot find -lC:/QTProjects/MyCustomWidget-build-desktop/release/mycustomwidgetplugin.dll

**high_flyer** · 21st March 2011, 16:34

you need to link against the *.lib file not the dll.
The dll is loaded at runtime.

**GrahamLabdon** · 21st March 2011, 16:36

I don't have a ".lib" file to link against

**high_flyer** · 21st March 2011, 16:48

Well, you should.
If you have the custom widget project source, try rebuilding it.
Without a lib you can't link against this DLL.

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