Loading QStringList value received from signal slot

[Lasith]

In my qt c++ application a QStringList is sent from one cpp file(MainWIndow) to another cpp file(Dialog) via signal and slots mechanism! I want to display the elements in the qtringList on a combo box in the Dialog.ui when the interface gets loaded(no button click)!

following is my code

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);

for(int i=0;i<subMessages.size();i++){
ui->comboBox->addItem(subMessages[i]);

}

}

void Dialog::receiveSubMessages(QStringList List){
subMessages=List;

}

The QStringList is received successfully through the slot(already verified).Though I used a for loop and tried display (as in the code) nothing was displayed on the combo box! How can I fix this issue?

[mostefa]

@Lasith said in Loading QStringList value received from signal slot:

The QStringList is received successfully through the slot(already verified).

Hi @Lasith

The receiveSubMessages(QStringList List) is called after the construction of your Dialog , Every time you try to add an item on your comboxBox your List is empty ,

Can you share the other parts of your code ?

Maybe you just wanna have another argument on your Dialog constructor ?

For example:

Dialog::Dialog(QStringList listToLoad, QWidget *parent = 0) ;

[SGaist]

Hi,

To add to @mostefa, if you want to update your combo box, you should first clear it and the call the QComboBox::addItems method. This will avoid that unnecessary loop.

Note that you should also pass your QStringList as const reference, that will avoid an unnecessary copy.

[Lasith]

@mostefa Thanx these are the only parts in my Dialog.cpp file! After I put th QStringList as an argument I get an error stating "Prototype for Dialog does not match any in class Dialog".

[Lasith]

@SGaist Thanx my combo box is empty from the beginning I just want to load the QStringList contents to it! :(

[mrjj]

Hi
If you changed to
Dialog::Dialog(QStringList listToLoad, QWidget *parent = 0) ;

Make sure to change it both in .h file and .cpp file so they match.