Loading ui at runtime

hema

hi ,

I am using qt 4.8.2 build on mingw on linux .
I have problem loading ui file at run time .I have added ui form to resource file .I get segmentation fault. the following error is displayed
Designer: An error has occurred while reading the UI file at line 1, column 0: Premature end of document.

the following is the code

QUiLoader loader;

QFile file&#40;":/forms/selectiondialog.ui"&#41;;
file.open(QFile::ReadOnly);

QWidget *formWidget = loader.load(&file); // getting segmentation fault 
file.close();

thanks,
hema

SGaist

Hi and welcome to devnet,

Are you sure that selectiondialog.ui is found ?

hema

the following is the error is what i am getting

"<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>322</width>
<height>189</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0" colspan="3">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QLabel" name="lbl_First">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QLabel" name="lbl_Second">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QListWidget" name="listWidget_Initial"/>
</item>
<item row="1" column="1">
<widget class="QListWidget" name="listWidget_Final"/>
</item>
</layout>
</item>
<item row="1" column="0">
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="1">
<widget class="QDialogButtonBox" name="buttonBox">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="standardButtons">
<set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
</property>
</widget>
</item>
<item row="1" column="2">
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
</layout>
</widget>
<resources/>
<connections>
<connection>
<sender>buttonBox</sender>
<signal>accepted()</signal>
<receiver>Dialog</receiver>
<slot>accept()</slot>
<hints>
<hint type="sourcelabel">
<x>248</x>
<y>254</y>
</hint>
<hint type="destinationlabel">
<x>157</x>
<y>274</y>
</hint>
</hints>
</connection>
<connection>
<sender>buttonBox</sender>
<signal>rejected()</signal>
<receiver>Dialog</receiver>
<slot>reject()</slot>
<hints>
<hint type="sourcelabel">
<x>316</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>286</x>
<y>274</y>
</hint>
</hints>
</connection>
</connections>
</ui>
"
Designer: An error has occurred while reading the UI file at line 1, column 0: Premature end of document.

SGaist

Please enclose you code within coding tags so it will make it readable.

I didn't state that the xml was wrong (it should not if you have generated it with designer) but did you check that file.open returns true ?

hema

selectiondialog.ui
file exists in the forms

hema

K , but file.open is returing true

SGaist

Ok then, did you create the ui file yourself ?

hema

sorry for a long delay ,
this ui is created by myself
I am calling this ui in one function funcn()
funcn()
{
QFile file(":/forms/selectiondialog.ui");
QWidget *selectionWidget = this->loadUiFile(file);
}

QWidget* OptimaRTools::loadUiFile(QFile& file1)
{

QUiLoader loader;
 QFile file&#40;":/forms/selectiondialog.ui"&#41;;
file.open(QFile::ReadOnly);
file.errorString();
QWidget *formWidget = loader.load(&file);
file.close();

return formWidget;
}

and the ui file is

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>322</width>
<height>189</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0" colspan="3">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QLabel" name="lbl_First">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QLabel" name="lbl_Second">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QListWidget" name="listWidget_Initial"/>
</item>
<item row="1" column="1">
<widget class="QListWidget" name="listWidget_Final"/>
</item>
</layout>
</item>
<item row="1" column="0">
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="1">
<widget class="QDialogButtonBox" name="buttonBox">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="standardButtons">
<set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
</property>
</widget>
</item>
<item row="1" column="2">
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
</layout>
</widget>
<resources/>
<connections>
<connection>
<sender>buttonBox</sender>
<signal>accepted()</signal>
<receiver>Dialog</receiver>
<slot>accept()</slot>
<hints>
<hint type="sourcelabel">
<x>248</x>
<y>254</y>
</hint>
<hint type="destinationlabel">
<x>157</x>
<y>274</y>
</hint>
</hints>
</connection>
<connection>
<sender>buttonBox</sender>
<signal>rejected()</signal>
<receiver>Dialog</receiver>
<slot>reject()</slot>
<hints>
<hint type="sourcelabel">
<x>316</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>286</x>
<y>274</y>
</hint>
</hints>"
</connection>
</connections>
</ui>

SGaist

Please use coding tags

What do you mean by yourself ? Using the designer integrated with QtCreator ?

hema

ui is created using Qt designer form

hema

@<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>322</width>
<height>221</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<widget class="QDialogButtonBox" name="buttonBox">
<property name="geometry">
<rect>
<x>65</x>
<y>187</y>
<width>181</width>
<height>32</height>
</rect>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="standardButtons">
<set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
</property>
</widget>
<widget class="QWidget" name="layoutWidget">
<property name="geometry">
<rect>
<x>10</x>
<y>10</y>
<width>301</width>
<height>171</height>
</rect>
</property>
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QLabel" name="lbl_First">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QLabel" name="lbl_Second">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QListWidget" name="listWidget_Initial"/>
</item>
<item row="1" column="1">
<widget class="QListWidget" name="listWidget_Final"/>
</item>
</layout>
</widget>
</widget>
<resources/>
<connections>
<connection>
<sender>buttonBox</sender>
<signal>accepted()</signal>
<receiver>Dialog</receiver>
<slot>accept()</slot>
<hints>
<hint type="sourcelabel">
<x>248</x>
<y>254</y>
</hint>
<hint type="destinationlabel">
<x>157</x>
<y>274</y>
</hint>
</hints>
</connection>
<connection>
<sender>buttonBox</sender>
<signal>rejected()</signal>
<receiver>Dialog</receiver>
<slot>reject()</slot>
<hints>
<hint type="sourcelabel">
<x>316</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>286</x>
<y>274</y>
</hint>
</hints>
</connection>
</connections>
</ui>
@

SGaist

What does print:

@qDebug() << file.readAll();@

?

hema

@"<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>322</width>
<height>189</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0" colspan="3">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QLabel" name="lbl_First">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QLabel" name="lbl_Second">
<property name="text">
<string/>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QListWidget" name="listWidget_Initial"/>
</item>
<item row="1" column="1">
<widget class="QListWidget" name="listWidget_Final"/>
</item>
</layout>
</item>
<item row="1" column="0">
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="1">
<widget class="QDialogButtonBox" name="buttonBox">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="standardButtons">
<set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
</property>
</widget>
</item>
<item row="1" column="2">
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>65</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
</layout>
</widget>
<resources/>
<connections>
<connection>
<sender>buttonBox</sender>
<signal>accepted()</signal>
<receiver>Dialog</receiver>
<slot>accept()</slot>
<hints>
<hint type="sourcelabel">
<x>248</x>
<y>254</y>
</hint>
<hint type="destinationlabel">
<x>157</x>
<y>274</y>
</hint>
</hints>
</connection>
<connection>
<sender>buttonBox</sender>
<signal>rejected()</signal>
<receiver>Dialog</receiver>
<slot>reject()</slot>
<hints>
<hint type="sourcelabel">
<x>316</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>286</x>
<y>274</y>
</hint>
</hints>
</connection>
</connections>
</ui>
"
Designer: An error has occurred while reading the UI file at line 1, column 0: Premature end of document.
"Phonon::SeekSlider" @

SGaist

Really strange...

Could you try to run the Calculator builder example ? To see if it also has the same problem

hema

I have tried calculator builder and text finder examples they are working fine

SGaist

Then copy the ui file from the example in your project and try to load to see if it works also there

hema

@"<ui version="4.0" >
<author></author>
<comment></comment>
<exportmacro></exportmacro>
<class>CalculatorForm</class>
<widget class="QWidget" name="CalculatorForm" >
<property name="objectName" >
<string notr="true" >CalculatorForm</string>
</property>
<property name="geometry" >
<rect>
<x>0</x>
<y>0</y>
<width>276</width>
<height>98</height>
</rect>
</property>
<property name="sizePolicy" >
<sizepolicy>
<hsizetype>5</hsizetype>
<vsizetype>5</vsizetype>
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="windowTitle" >
<string>Calculator Builder</string>
</property>
<layout class="QGridLayout" >
<property name="objectName" >
<string notr="true" />
</property>
<property name="margin" >
<number>9</number>
</property>
<property name="spacing" >
<number>6</number>
</property>
<item row="0" column="0" >
<layout class="QHBoxLayout" >
<property name="objectName" >
<string notr="true" />
</property>
<property name="margin" >
<number>1</number>

hema

loading calculator.ui giving the same error in my application

SGaist

Then can you post your pro file and a minimal code example that reproduce the problem ?