c++ - Qt - Adding data to a TableWidget via another TableWidget -

i stuck on problem table widgets , in need of help. basically, trying table widget on dialogue screen information inside of , fill information on table widget on main window screen. so, when click ok button, should take text 1 table widget , place in other table widget. tried using below code, , build ran. but, clicked ok, program crashed. table called tablewidgetedit table trying copy , send table in mainwindow, named tablewidget. (just make not vague, trying copy data 1 table , place in table, when user clicks on ok button.)

    int rows = 6;     int columns = 5;     ui::mainwindow *mainui;     void editmode1::on_pushbutton_clicked()     {        (int = 0; i<columns;++i){            (int j = 0;j<rows;++j){              qtablewidgetitem *celltxt= tablewidgetedit.item(j,i);              mainui->tablewidget->setitem(j,i,celltxt);            }         }      } 

any , appreciated. thank you! (i not best qt if don't mind explaining changes have made , why, great thank you!).

-update- @jeet here code im trying do:

tablemainwindow1.h:

#ifndef tablemainwindow1_h #define tablemainwindow1_h  #include <qmainwindow> #include "tabledialougewindow.h"  namespace ui { class tablemainwindow1; }  class tablemainwindow1 : public qmainwindow {     q_object  public:     explicit tablemainwindow1(qwidget *parent = 0);     ~tablemainwindow1();  private slots:     void on_pushbutton_clicked();  private:     ui::tablemainwindow1 *ui;     tabledialougewindow *tbl2; };  #endif // tablemainwindow1_h 

tablemainwindow1.cpp:

#include "tablemainwindow1.h" #include "ui_tablemainwindow1.h"  tablemainwindow1::tablemainwindow1(qwidget *parent) :     qmainwindow(parent),     ui(new ui::tablemainwindow1) {     ui->setupui(this);     ui->tablewidget->setrowcount(3);     ui->tablewidget->setcolumncount(3); }  tablemainwindow1::~tablemainwindow1() {     delete ui; }   void tablemainwindow1::on_pushbutton_clicked() {     tbl2 = new tabledialougewindow(this);     tbl2->show(); } 

tabledialougewindow.h:

#ifndef tabledialougewindow_h #define tabledialougewindow_h  #include <qdialog>  namespace ui { class tabledialougewindow; }  class tabledialougewindow : public qdialog {     q_object  public:     explicit tabledialougewindow(qwidget *parent = 0);     ~tabledialougewindow();  private slots:     void on_buttonbox_accepted();  private:     ui::tabledialougewindow *ui; };  #endif // tabledialougewindow_h 

tabledialougewindow.cpp:

#include "tabledialougewindow.h" #include "ui_tabledialougewindow.h" #include "tablemainwindow1.h" #include "ui_tablemainwindow1.h"  int rows = 3; int columns = 3; ui::tablemainwindow1 *mainui; tabledialougewindow::tabledialougewindow(qwidget *parent) :     qdialog(parent),     ui(new ui::tabledialougewindow) {     ui->setupui(this);     ui->tablewidget->setrowcount(rows);     ui->tablewidget->setcolumncount(columns); }  tabledialougewindow::~tabledialougewindow() {     delete ui; }   void tabledialougewindow::on_buttonbox_accepted() {     for(int = 0;i<columns;++i){         for(int j = 0;j<rows;++j){             qtablewidgetitem *celltxt = ui->tablewidget->item(j,i);             qtablewidgetitem *celltxt2 =new qtablewidgetitem(*celltxt);             mainui->tablewidget->setitem(j,i,celltxt2);         }     }     accept(); } 

hope helps.

the error cannot insert item owned qtablewidget. before make copy need clone data. can use copy constructor achieve this. code comment explain in detail. hope help.

    void mainwindow::on_cmdtransfer_clicked() {     //source table     int rows = ui->tbl1->rowcount();     int columns =ui->tbl1->columncount();      //destination table     ui->tbl2->setcolumncount(columns);     ui->tbl2->setrowcount(rows);     //copy data form 1 table another.    (int = 0; i<columns;++i){        (int j = 0;j<rows;++j){          qtablewidgetitem *celltxt= ui->tbl1->item(j,i);          //clone data using copy constructor          qtablewidgetitem *celltxt1=new qtablewidgetitem(*celltxt);          ui->tbl2->setitem(j,i,celltxt1);        }     } }