c++ - Qt: "No such signal" error -

i have simple code; here i've 2 buttons, press first 1 , shows msgbox. press "okay", , should call connected action written in second button, doesn't. instead error:

object::connect: no such signal qmessagebox::buttonclicked(qmessagebox::ok) object::connect:  (receiver name: 'openfile_bttn') 

the code:

#include "mainwindow.h" #include "ui_mainwindow.h"  mainwindow::mainwindow(qwidget *parent) :     qmainwindow(parent),     ui(new ui::mainwindow) {     ui->setupui(this); }  mainwindow::~mainwindow() {     delete ui; }  void mainwindow::on_openfile_bttn_clicked(){     qfiledialog::getopenfilename(this,tr("open file"), "", tr(""));//open dialog "openfile" }  void mainwindow::on_pushbutton_clicked(){     qmessagebox msgbox;     msgbox.settext("push button choose file");     //connect clicking button in msgbox action in openfile_bttn button     qwidget::connect(&msgbox,signal(buttonclicked(qmessagebox::ok)),             ui->openfile_bttn, slot(on_openfile_bttn_clicked()));     msgbox.exec();//show msgbox } 

also found interesting thing, error message appears when msgbox popup, not when click button "ok" inside msgbox.

no need signals here, exec returns button clicked.

void mainwindow::on_openfile_bttn_clicked(){     qfiledialog::getopenfilename(this,tr("open file"), "", tr(""));//open dialog "openfile" }  void mainwindow::on_pushbutton_clicked(){     qmessagebox msgbox;     msgbox.settext("push button choose file");     //connect clicking button in msgbox action in openfile_bttn button     if(msgbox.exec() == qmessagebox::ok)     {       on_openfile_bttn_clicked();     } } 

if want use custom buttons can still call msgbox.buttonclicked() after exec find out button clicked.