QNetworkRequest 导致程序“意外完成”

Question

我是 C++ 和 Qt 的初学者，我正在尝试制作一个翻译程序，但它在执行网络请求时崩溃...

错误： Overstter.exe 退出，代码为 255

我的代码：

头文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QApplication>
...
#include <QUrl>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QtScript/QScriptEngine>
#include <QtScript/QScriptValue>
#include <QtScript/QScriptValueIterator>

class MainWindow : public QWidget
{
Q_OBJECT

public:
MainWindow();

public slots:
void getTranslation();
void onTranslationRecieved(QNetworkReply* reply);

private:
QTextEdit *te_input;
QTextEdit *te_output;
};
#endif

代码文件

void MainWindow::getTranslation()
{
te_output->setText("[Oversettelse pågår]\n[Translation in progress]");

QString url = "http://translate.googleapis.com/translate_a/single?client=gtx";
...
url.append(te_input->toPlainText());
qInfo() << "url: " + url;

QNetworkAccessManager *nam;
connect(nam, SIGNAL(finished(QNetworkReply*)), this, SLOT(onTranslationRecieved(QNetworkReply*)));
nam->get(QNetworkRequest(QUrl(url)));

}

void MainWindow::onTranslationRecieved(QNetworkReply* reply)
{
QString data = (QString) reply->readAll();
te_output->setText(data);

QScriptEngine engine;
QScriptValue result = engine.evaluate(data);
QString translation = result.property("0").property("0").property("0").toString();
}

任何帮助将不胜感激:-)

Answer 1

首先：

一行

QNetworkAccessManager *nam; 

应该是：

QNetworkAccessManager *nam = new QNetworkAccessManager(this);