我的程序完美启动并显示了我创建的 QPlainTextEdit(console) 小部件,然后当我从该小部件调用方法时,程序失败并退出
主文件
#include "cmdmw.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
cmdMW w;
w.show();
return a.exec();
}
cmdmw.h
#ifndef CMDMW_H
#define CMDMW_H
#include <QMainWindow>
#include <QDebug>
namespace Ui {
class cmdMW;
}
class Console;
class cmdMW : public QMainWindow
{
Q_OBJECT
public:
explicit cmdMW(QWidget *parent = 0);
void writeToTextEdit(QByteArray message);
~cmdMW();
private:
Console *console;
};
#endif // CMDMW_H
cmdmw.cpp
#include "cmdmw.h"
#include "ui_cmdmw.h"
#include "console.h"
cmdMW::cmdMW(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::cmdMW)
{
ui->setupUi(this);
console = new Console(ui->centralwidget);
QByteArray text="my text";
writeToTextEdit(text);
}
void cmdMW::writeToTextEdit(QByteArray message)
{
qDebug() << "starting the subroutine";//this is work perfectly and shows the output
console->putData(message);//here it fails >>"The program has unexpectedly finished."
}
控制台.h
#ifndef CONSOLE_H
#define CONSOLE_H
#include <QPlainTextEdit>
class Console : public QPlainTextEdit
{
Q_OBJECT
public:
explicit Console(QWidget *parent = 0);
void putData(QByteArray data);
};
#endif // CONSOLE_H
控制台.cpp
#include "console.h"
#include <QScrollBar>
#include <QtCore/QDebug>
Console::Console(QWidget *parent)
: QPlainTextEdit(parent)
{
document()->setMaximumBlockCount(100);
QPalette p = palette();
p.setColor(QPalette::Base, Qt::black);
p.setColor(QPalette::Text, Qt::green);
setPalette(p);
}
void Console::putData(QByteArray data)
{
qDebug()<< data; //doesn't work because the program exit before reach this line
insertPlainText(QString(data));
QScrollBar *bar = verticalScrollBar();
bar->setValue(bar->maximum());
}