我写了一个简单的程序来自动设置路由器的过程。检查后,我发现指针需要delete
(QNetworkReply *reply
中的replyFinish()
)并完成工作,但在此之后程序崩溃并且Qt显示它在某些汇编代码中停止: (
所以我的问题是:
是否有任何常见的做法来处理这种情况(Qt 显示程序在某些汇编代码中停止了)
删除不再使用的指针时,我做错了什么? (非常确定)
以下是代码:
#ifndef HTTPGETTER_H
#define HTTPGETTER_H
class QNetworkAccessManager;
class QNetworkReply;
class QNetworkRequest;
class QAuthenticator;
#include <QObject>
class httpGetter : public QObject
{
Q_OBJECT
private:
QNetworkAccessManager *nam;
public:
explicit httpGetter(QObject *parent=0);
~httpGetter();
public slots:
void replyFinish(QNetworkReply* reply);
void onAuthen(QNetworkReply*,QAuthenticator*);
};
器具
#include "httpgetter.h"
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QtNetwork/QNetworkAccessManager>
#include <QAuthenticator>
#include <QDebug>
httpGetter::httpGetter(QObject *parent) : QObject(parent)
{
nam = new QNetworkAccessManager(this);
QObject::connect(nam,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinish(QNetworkReply*)));
QObject::connect(nam,SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),this,SLOT(onAuthen(QNetworkReply*,QAuthenticator*)));
QUrl url("http://192.168.1.1");
QNetworkReply *reply= nam->get(QNetworkRequest(url));
}
httpGetter::~httpGetter(){
delete nam;
}
void httpGetter::replyFinish(QNetworkReply *reply)
{
if (reply==NULL) {
qDebug() << "NULL reply";
return;
}
QVariant statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
qDebug() << statusCode.toString();
if (reply->error()==QNetworkReply::NoError) {
qDebug() << "NICE reply";
QByteArray bytes = reply->readAll();
QString answer = QString(bytes);
qDebug()<< answer;
}
else {
qDebug() << "reply error";
}
//delete reply; ==> delele cause sigsegv, if don't the program run like a while(true)
//reply == NULL;
}
void httpGetter::onAuthen(QNetworkReply* rep,QAuthenticator* auth)
{
if ( rep==NULL || auth == NULL) {
qDebug()<< "reply or authentication pointer is null";
return;
}
qDebug()<< rep->readAll();
auth->setUser("rolan");
auth->setPassword("123456");
}
主
#include <QtCore/QCoreApplication>
#include "httpgetter.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
httpGetter abc;
return a.exec();
}
答案 0 :(得分:5)
注意:请求完成后,由...负责 用户在适当的时间删除
QNetworkReply
对象。不要 直接在连接到finished()
的插槽内删除它。您可以 使用deleteLater()
函数。
此外,自
nam = new QNetworkAccessManager(this);
创建一个新的QNetworkAccessManager
,其中this
为其父级,而QObject
的析构函数会自动删除其所有子级,delete nam;
位于{{ 1}}析构函数是不必要的,最终会导致双重删除。