Signals and slots in xml coding

[ebonygeek]

I have been playing with Qt for some months now. I am teaching myself through coding and recreating code in various versions; QML, XML, C++, Gui.

This approach is giving me a lot of insight.
But I am stuck, The code below is mainly to do it all in xml. But I can't get my signals and slots to work. Everything looks fine to me and I am thinking I have missed something.

@

<ui version="4.0">
<class>enTry1</class>
<widget class="QMainWindow" name="enTry1">
<property name="geometry" >
<rect>
<x>0</x>
<y>0</y>
<width>500</width>
<height>200</height>
</rect>
</property>
<property name="windowTitle">
<string>All xml signals and slots example</string>
</property>
<widget class="QWidget" name="centralWidget">
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>70</x>
<y>75</y>
<width>75</width>
<height>23</height>
</rect>
</property>
<property name="text">
<string>Pushbutton</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton_2">
<property name="geometry">
<rect>
<x>70</x>
<y>125</y>
<width>75</width>
<height>23</height>
</rect>
</property>
<property name="text">
<string>Pushbutton_2</string>
</property>
</widget>
<widget class="QLabel" name="label">
<property name="geometry">
<rect>
<x>80</x>
<y>40</y>
<width>46</width>
<height>13</height>
</rect>
</property>
<property name="text">
<string>TextLabel</string>
</property>
</widget>
</widget>

    <widget class="QMenuBar" name="menuBar">
        <property name="geometry">
            <rect>
                <x>0</x>
                <y>0</y>
                <width>400</width>
                <height>21</height>
            </rect>
        </property>
    </widget>
    <widget class="QToolBar" name="mainToolBar">
        <attribute name="toolBarArea">
            <enum>TopToolBarArea</enum>
        </attribute>
        <attribute name="toolBarBreak">
            <bool>false</bool>
        </attribute>
    </widget>
    <widget class="QStatusBar" name="statusBar" />

</widget>

<layoutDefault spacing="6" margin="11" />
<resources/>
<connections>
    <connection>
        <sender>pushButton</sender>
        <signal>clicked()</signal>
        <receiver>enTry1</receiver>
        <slot>button1pressed()</slot>
        <hints>
            <hint type="sourcelabel">
                <x>113</x>
                <y>138</y>
            </hint>
            <hint type="destinationlabel">
                <x>207</x>
                <y>136</y>
            </hint>
        </hints>
    </connection>
    <connection>
        <sender>pushButton_2</sender>
        <signal>clicked()</signal>
        <receiver>enTry1</receiver>
        <slot>button2pressed()</slot>
        <hints>
            <hint type="sourcelabel">
                <x>127</x>
                <y>199</y>
            </hint>
            <hint type="destinationlabel">
                <x>206</x>
                <y>183</y>
            </hint>
        </hints>
    </connection>
</connections>
<slots>
    <slot>button1pressed()</slot>
    <slot>button2pressed()</slot>
</slots>

</ui>
@

To give more info the code runs just nothing when buttons are pressed. The errors say;

QObject::connect: No such slot QLabel::button1pressed() in ./ui_entry1.h:69
QObject::connect: (sender name: 'pushButton')
QObject::connect: (receiver name: 'label')
QObject::connect: No such slot enTry1::button2pressed() in ./ui_entry1.h:70
QObject::connect: (sender name: 'pushButton_2')
QObject::connect: (receiver name: 'enTry1')

Any suggestions....??

[dbzhang800]

Hi,

[quote author="ebonygeek" date="1374271313"]
QObject::connect: No such slot QLabel::button1pressed() in ./ui_entry1.h:69
QObject::connect: (sender name: ‘pushButton’)
QObject::connect: (receiver name: ‘label’)
[/quote]

I don't know how did you create the connection, but as you can see in the documentation of QLabel, there is no slot called button1pressed() in QLabel.

http://qt-project.org/doc/qt-5.1/qtwidgets/qlabel.html

[quote author="ebonygeek" date="1374271313"]
QObject::connect: No such slot enTry1::button2pressed() in ./ui_entry1.h:70
QObject::connect: (sender name: ‘pushButton_2’)
QObject::connect: (receiver name: ‘enTry1’)
[/quote]

enTry1 is object name of your custom class MainWindow. You should define a slot called button2pressed() in the class if you want to make this connection works.