QString a;
             a=ui->tableView->getItem(1,3);

buf = tbl->model()->data(tbl->model()->index(1,2)).toString();

QString stroka;
    QTableWidgetItem  *itm=ui->tableWidget->currentItem();
    //QMessageBox::information(this,"Info",itm->text());
    stroka=itm->text();
    QMessageBox::information(this,"Info",stroka);

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QTableWidget>
#include<QMessageBox>
#include<QString>
#include <QTextCodec>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("CP1251"));
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("CP1251"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("CP1251"));

    ui->setupUi(this);
    ui->tableWidget->setRowCount(5);
    ui->tableWidget->setColumnCount(3);
    ui->tableWidget->setHorizontalHeaderLabels  (QStringList()<<"В т о р о й"<<"Первый");
}