Installation and getting started with first app

giesbert

Or you only declared the type like
@
class QSystemStorageInfo;
@
and use it as member. This is not allowed. If you use it for pointers, declaration like above should work.

KennedyDayala

Gerolf...I have included
#include <QSystemStorageInfo>

and this is the complete compilation report

@
Running build steps for project IDT_Demo_UI...
Configuration unchanged, skipping qmake step.

Starting: "C:\QtSDK\mingw\bin\mingw32-make.exe" -w

mingw32-make: Entering directory `E:/Bose/Qt playground/IDT_Demo_UI-build-desktop'

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

mingw32-make[1]: Entering directory `E:/Bose/Qt playground/IDT_Demo_UI-build-desktop'

g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -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"c:\QtSDK\Desktop\Qt\4.7.2\mingw\include\QtCore" -I"c:\QtSDK\Desktop\Qt\4.7.2\mingw\include\QtGui" -I"c:\QtSDK\Desktop\Qt\4.7.2\mingw\include" -I"c:\QtSDK\Desktop\Qt\4.7.2\mingw\include\ActiveQt" -I"debug" -I"." -I"..\IDT_Demo_UI" -I"." -I"c:\QtSDK\Desktop\Qt\4.7.2\mingw\mkspecs\win32-g++" -o debug\main.o ..\IDT_Demo_UI\main.cpp

In file included from ..\IDT_Demo_UI\main.cpp:2:

..\IDT_Demo_UI/idt_mainwindow.h:4:30: error: QSystemStorageInfo: No such file or directory

In file included from ..\IDT_Demo_UI\main.cpp:2:

..\IDT_Demo_UI/idt_mainwindow.h:23: error: ISO C++ forbids declaration of 'QSystemStorageInfo' with no type

..\IDT_Demo_UI/idt_mainwindow.h:23: error: expected ';' before '*' token

mingw32-make[1]: Leaving directory `E:/Bose/Qt playground/IDT_Demo_UI-build-desktop'

mingw32-make: Leaving directory `E:/Bose/Qt playground/IDT_Demo_UI-build-desktop'

mingw32-make[1]: *** [debug/main.o] Error 1

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

The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.

Error while building project IDT_Demo_UI (target: Desktop)
@

When executing build step 'Make'

and this is .h file

@
#ifndef IDT_MAINWINDOW_H
#define IDT_MAINWINDOW_H

#include <QSystemStorageInfo>
#include <QtGui>
#include <QMainWindow>

namespace Ui {
class IDT_MainWindow;
}

class IDT_MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit IDT_MainWindow(QWidget *parent = 0);
~IDT_MainWindow();

private:
Ui::IDT_MainWindow *ui;

QSystemStorageInfo *sti;

};

#endif // IDT_MAINWINDOW_H

@

vinb

please wrap your code with @ tag

KennedyDayala

I am realy sorry vinb...I didn't get you !! how to rap with a tag ??

vinb

i dont think "QSystemStorageInfo" exist in Qt,
only:
QSysInfo
QSystemLocale
QSystemSemaphore
QSystemTrayIcon

If it is your own made you have to use "" instead of <>.

vinb

use @
then your code and end with "@" without the ""

giesbert

Your problem lies more in the beginning of your build output:

@
..\IDT_Demo_UI/idt_mainwindow.h:4:30: error: QSystemStorageInfo: No such file or directory
@

where does QSystemStorageInfo come from?

If I googled correctly, it's part of QtMobility, did you install that? did you add the needed include paths in the pro file?

KennedyDayala

ok...then which class should i use to get the system storage info if it is for desktop application ?

giesbert

Afaik QtMobility may also be used on the Desktop. But you have to set your include paths.

KennedyDayala

please guide me how to set that ...

giesbert

I said Afaik, not that I did it before ;-)

I never used QtMobility

goetz

[quote author="Thomas Kennedy" date="1301490967"]ok...then which class should i use to get the system storage info if it is for desktop application ?[/quote]

I don't know what info you want to get from QSystemStorageInfo, but maybe "QDesktopServices::storageLocation() ":http://doc.qt.nokia.com/4.7/qdesktopservices.html#storageLocation provides what you need.

mlong

In order to use the QSystemStorageInfo class from Mobility, be sure that in your .pro file you have included the lines

@
CONFIG += mobility
MOBILITY += systeminfo
@

KennedyDayala

Thanks a lot...

without changing .pro file I am trying with QDir::Drives()..I will update you soon about my results..before that I have another query...

I have placed my controls on the main window by opening 'mainwindow.ui' in design mode..how would I create control variables for those controls in my code using QTCreator ?

andre

"control variables"? You mean you need a pointer to them?

@
m_ui->myCoolLineEdit->setText("I'm so cool!");
@

works for me. myCoolLineEdit is of course the name you gave the widget in Designer, and m_ui is the member variable that holds the UI class you created.

KennedyDayala

excellent..now i understood this part Andre..I have creaed a QTreeWidget on my MainWindow and coded like tihs..

@
ui->treeWidgetDrives = new QTreeWidget();
ui->treeWidgetDrives->setColumnCount(1);
QStringList strlstHeaders;
strlstHeaders<<tr("Storage Drives");
ui->treeWidgetDrives->setHeaderLabels(strlstHeaders);
@

...when i run my code nothing is happened to my TreeWidget(no header is assigned)..instead it is showing the properties which i set from 'Edit Tree Widget' dialog !!!

[EDIT: code formatting, please use @-tags, Volker]

goetz

The tree widget is automatically created for you. Just remove the first line of your snippet.

KennedyDayala

if i remove that line and run the code I am not getting my Window displayed and here is the ouput..

Starting E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe...
E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe exited with code -1073741819

goetz

code -1073741819 = 0xC0000005. On windows this means an access violation. Seems like your UI is not initialized properly or messed up in some way....

KennedyDayala

perfect analysis..

I have moved this line to bottom of the code like this..

@
IDT_MainWindow::IDT_MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::IDT_MainWindow)

{
// my code here...

    ui->setupUi(this);

}
@

now i moved it to top and works fine..thanks a ton

[EDIT: code formatting, please use @-tags or the editor button, Volker]