Hi All,

I have created a custom widget, e.i, a label with a clicked() signal. It is properly showing in Qt Designer and I was able to add it on my project UI. The problem is during the compilation of my project, the following error occurred:

Qt Code: 
  1. release/employeeentry.o:employeeentry.cpp:(.text$_ZN16Ui_EmployeeEntry7setupUiEP7QDialog[Ui_EmployeeEntry::setupUi(QDialog*)]+0x3f1): undefined reference to `_imp___ZN7HSLabelC1EP7QWidget'
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Below are the codes of my custom label plugin:

HSLabel.pro
Qt Code: 
  1. CONFIG      += designer plugin
  2. TARGET      = $$qtLibraryTarget($$TARGET)
  3. TEMPLATE    = lib
  4. QTDIR_build:DESTDIR     = $$QT_BUILD_TREE/plugins/designer
  5.  
  6. CONFIG += release
  7. HEADERS += \
  8.     hslabel.h \
  9.     customwidgetplugin.h
  10.  
  11. SOURCES += \
  12.     hslabel.cpp \
  13.     customwidgetplugin.cpp
  14.  
  15. target.path = $$[QT_INSTALL_PLUGINS]/designer
  16. sources.files = $$SOURCES $$HEADERS *.pro
  17. sources.path ="D:\Qt\HSLabel"
  18. INSTALLS += target sources
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customwidgetplugin.cpp

Qt Code: 
  1. #include "hslabel.h"
  2. #include "customwidgetplugin.h"
  3. #include <QtPlugin>
  4.  
  5. HSLabelPlugin::HSLabelPlugin(QObject *parent)
  6.     : QObject(parent)
  7. {
  8.     initialized = false;
  9. }
  10.  
  11. void HSLabelPlugin::initialize(QDesignerFormEditorInterface * /* core */)
  12. {
  13.     if (initialized)
  14.         return;
  15.  
  16.     initialized = true;
  17. }
  18.  
  19. bool HSLabelPlugin::isInitialized() const
  20. {
  21.     return initialized;
  22. }
  23.  
  24. QWidget *HSLabelPlugin::createWidget(QWidget *parent)
  25. {
  26.     return new HSLabel(parent);
  27. }
  28.  
  29. QString HSLabelPlugin::name() const
  30. {
  31.     return "HSLabel";
  32. }
  33.  
  34. QString HSLabelPlugin::group() const
  35. {
  36.     return "Display Widgets";
  37. }
  38.  
  39. QIcon HSLabelPlugin::icon() const
  40. {
  41.     return QIcon();
  42. }
  43.  
  44. QString HSLabelPlugin::toolTip() const
  45. {
  46.     return "";
  47. }
  48.  
  49. QString HSLabelPlugin::whatsThis() const
  50. {
  51.     return "";
  52. }
  53.  
  54. bool HSLabelPlugin::isContainer() const
  55. {
  56.     return false;
  57. }
  58.  
  59. QString HSLabelPlugin::domXml() const
  60. {
  61.     return "<ui language=\"c++\">\n"
  62.            " <widget class=\"HSLabel\" name=\"hsLabel\">\n"
  63.            "  <property name=\"geometry\">\n"
  64.            "   <rect>\n"
  65.            "    <x>0</x>\n"
  66.            "    <y>0</y>\n"
  67.            "    <width>50</width>\n"
  68.            "    <height>13</height>\n"
  69.            "   </rect>\n"
  70.            "  </property>\n"
  71.            "  <property name=\"text\" >\n"
  72.            "   <string>HSLabel</string>\n"
  73.            "  </property>\n"
  74.            " </widget>\n"
  75.            "</ui>\n";
  76. }
  77.  
  78. QString HSLabelPlugin::includeFile() const
  79. {
  80.     return "hslabel.h";
  81. }
  82.  
  83. Q_EXPORT_PLUGIN2(customwidgetplugin, HSLabelPlugin)
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customwidgetplugin.h
Qt Code: 
  1. #ifndef CUSTOMWIDGETPLUGIN_H
  2. #define CUSTOMWIDGETPLUGIN_H
  3.  
  4. #include <QDesignerCustomWidgetInterface>
  5.  
  6. class HSLabelPlugin : public QObject, public QDesignerCustomWidgetInterface
  7. {
  8.     Q_OBJECT
  10.  
  11. public:
  12.     HSLabelPlugin(QObject *parent = 0);
  13.  
  14.     bool isContainer() const;
  15.     bool isInitialized() const;
  16.     QIcon icon() const;
  17.     QString domXml() const;
  18.     QString group() const;
  19.     QString includeFile() const;
  20.     QString name() const;
  21.     QString toolTip() const;
  22.     QString whatsThis() const;
  23.     QWidget *createWidget(QWidget *parent);
  24.     void initialize(QDesignerFormEditorInterface *core);
  25.  
  26. private:
  27.     bool initialized;
  28. };
  29.  
  30. #endif
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hslabel.cpp
Qt Code: 
  1. #include <QtGui>
  2. #include <QDebug>
  3. #include "hslabel.h"
  4.  
  5. HSLabel::HSLabel(QWidget *parent)
  6.     : QLabel(parent)
  7. {
  8.     qDebug() << "HSLabel Constructor";
  9.  
  10. }
  11.  
  12. void HSLabel::mousePressEvent ( QMouseEvent * ev )
  13. {
  14.     qDebug() << "HSLabel Pressed";
  15.     emit clicked();
  16. }
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hslabel.h
Qt Code: 
  1. #include <QtGui>
  2. #include <QDebug>
  3. #include "hslabel.h"
  4.  
  5. HSLabel::HSLabel(QWidget *parent)
  6.     : QLabel(parent)
  7. {
  8.     qDebug() << "HSLabel Constructor";
  9.  
  10. }
  11.  
  12. void HSLabel::mousePressEvent ( QMouseEvent * ev )
  13. {
  14.     qDebug() << "HSLabel Pressed";
  15.     emit clicked();
  16. }
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Please help, I'm stuck here.. Thanks..