QSettings object not overwriting the existing group's key value, creates [General] and stores data, how to make it write on the actual location in the .ini file?

thippu

Hi,

I have global QSetting *iniSetting =new QSetting(filename,QSettings::IniFormat,this);, reads the .ini file and creates groups.
2)I have global QTreeWidgetobject, it is getting populated by QTreeWidgetItems objects , data from the iniSettings object.
3)Now while user double-clicks a group value on QTreeWidget object and edits the column 2 value ,QTreeWidgetgenerates the signal itemChanged(QTreeWidgetItem*,int); this I have connected to the slot itemChanged(QTreeWidgetItem *item,int col);of the Mainwindow object. Now I want to get the edited value and update the value in the .ini file but it is not happening properly, please help me.

code:


 void Widget::itemChanged(QTreeWidgetItem *item,int col)
 {
    iniSettings->setValue(item->text(0),item->text(col));//here item->text(0) is key of a group in iniSettings object and item->text(col) new value edit by user corresponds to key and it has to be updated on the .ini file, but not working properly.
// this will create contents in .ini file like this:
[General]
key1=value
//output not overwritting the existing group using key with new value but creates the above contents in .ini file how to make this to update on the correct group ?

raven-worx

@thippu
to write a value into a group you need either set the key of the value to group/key
or you call QSettings::beginGroup() / QSettings::endGroup() before calling QSettings::setValue()

thippu

@raven-worx
you are not got what my problem is,
Groups have been created initially using code:

{
        iniSettings->beginGroup(group);
        QTreeWidgetItem &rootaddress=createRoot(group); //it creates group text as node on QTreeWidget object.
         foreach( QString key, iniSettings->childKeys() )
         {
                QVariant val = iniSettings->value(key);
                createChild(rootaddress,key,val); //adds key and value of the group as the child nodes to the QTreeWidget using 
                rootaddress.
         }
     iniSettings->endGroup();
}

Now if a user changes(or edits) any value on the QTreeWidgetItem on QTreeWidget object, I want update this values to existing group key/value in the QSetting and the .ini file ,

raven-worx

@thippu said in QSettings object not overwriting the existing group's key value, creates [General] and stores data, how to make it write on the actual location in the .ini file?:

Now if a user changes(or edits) any value on the QTreeWidgetItem on QTreeWidget object, I want update this values to existing group key/value in the QSetting and the .ini file

yes, and why is my advise wrong here?!

thippu

@raven-worx iniSettings has been populated by group names using .ini file already, So why to call again QSettings::beginGroup.
Or maybe I did not get what you are saying.

thippu

@raven-worx , I did not get this

to write a value into a group you need either set the key of the value to group/key

raven-worx

@thippu said in QSettings object not overwriting the existing group's key value, creates [General] and stores data, how to make it write on the actual location in the .ini file?:

So why to call again QSettings::beginGroup.

because this sets the group to read/write from (if you do not specify the group in the key path already).

There are the 2 following ways to read the key mykey from the group mygroup

iniSettings->beginGroup("mygroup");
QVariant val = iniSettings->value("mykey");
iniSettings->endGroup();

QVariant val = iniSettings->value("mygroup/mykey");

thippu

@raven-worx , I think I got it.
my current key/value stored in QTreeWidgetItem and this is attached root node, root node contains the group name.
how to get parent node text using current QTreeWidgetItem?

raven-worx

@thippu said in QSettings object not overwriting the existing group's key value, creates [General] and stores data, how to make it write on the actual location in the .ini file?:

how to get parent node text using current QTreeWidgetItem?

QTreeWidgetItem::parent()

thippu

okay, but my group name is dynamic.

iniSettings->beginGroup("mygroup");
QVariant val = iniSettings->value("mykey");
iniSettings->endGroup();

QVariant val = iniSettings->value("mygroup/mykey");

thippu

@raven-worx
I did

 void Widget::itemChanged(QTreeWidgetItem *item,int col)
{
QTreeWidgetItem *parent=item->parent();
qDebug()<<parent->text(0);//App is getting crashed here, do not know why? how to get text from this root?

raven-worx

@thippu
probably because parent is a NULL pointer when you call this piece of code for all your items.
Your root items of course do not have a parent item.

thippu

@raven-worx
like below I'm doing to create nodes and children.

 QTreeWidgetItem& Widget::createRoot(const QString &groupname)
{
   QTreeWidgetItem *root=new QTreeWidgetItem(displayTreeWidget);//here parameter is QTreeWidget
   root->setText(0,groupname);
  displayTreeWidget->addTopLevelItem(root);
return *root;
}

//method to create children and attach them to toplevelitem
void Widget::createChild(QTreeWidgetItem &rootaddress,const QString &key,const QVariant &value)
{
  QTreeWidgetItem *child=new QTreeWidgetItem;
 child->setText(0,key);
child->setTextAlignment(0,Qt::AlignCenter);
child->setData(1,2,value);
rootaddress.addChild(child);
}
//these two methods are called while initial group creation
//mentioned with bold text in the code below

Groups have been created initially using code:
{
        iniSettings->beginGroup(group);
        QTreeWidgetItem &rootaddress=**createRoot(group);** //it creates group text as node on QTreeWidget object.
         foreach( QString key, iniSettings->childKeys() )
         {
                QVariant val = iniSettings->value(key);
                ***createChild(rootaddress,key,val); *** /adds key and value of the group as the child nodes to the QTreeWidget using 
                rootaddress.
         }
     iniSettings->endGroup();
} 
Now if a user changes(or edits) any value on the QTreeWidgetItem on QTreeWidget object, I want update this values to existing group key/value in the QSetting and the .ini file ,

jsulm

@thippu Again: a root node does NOT have a parent.

thippu

@jsulm I'm stuck here if I find the group name I can complete this, don't know how to fix it help me.

raven-worx

@thippu
assuming your tree widget only has 1 sub-level a simple check can be:

QTreeWidgetItem* item = ...;
if( QTreeWidgetItem* parent = item->parent() )
{
     // item is a child (= key)
     QString keyPath = QString("%1/%2").arg(parent->text(0)).arg(item->text(0));
     QVariant val = iniSettings->value( keyPath ); // reading
     iniSettings->setValue( keyPath, val ); // writing
}
else
{
     // item is a root item (= group)
}

thippu

@raven-worx it is working perfectly, Awesome.
Thanks a lot.