Question

我正在尝试使用QNetworkReply做一个简单的GET请求，但是完成（）永远不会被调用，这是我的代码

QtTest::QtTest(QWidget *parent):QWidget(parent){
  ui.setupUi(this);

  auto network_access_manager = new QNetworkAccessManager(this);
  auto reply = network_access_manager->get(QNetworkRequest(QUrl("http://www.whatsmyip.org/")));
  connect(reply, SIGNAL(finished()), this, SLOT(download_finished()));


qDebug() << "Started";

}

void QtTest::download_finished() {

  qDebug() << "Finished";

}

如果我在启动时检查输出，我会

QObject::connect: Cannot connect (null)::aboutToQuit() to QNativeWifiEngine::closeHandle()

Exception thrown at 0x749040F8 (KernelBase.dll) in QtTest.exe: 0x000006A6: The binding handle is invalid.

Answer 1

验证您是否将download_finished（）声明为插槽。

class QtTest : public QObject
{
    Q_OBJECT
public:
    QtTest(QObject *parent = 0);

private slots:
    void download_finished();
};

Answer 2

更改download_finished的定义以包含回复;

信号是;完成（QNetworkReply *回复）所以

  QtTest::download_finished(QNetworkReply *reply)
  {
     .... etc

确保在connect语句中包含该参数。

Qt 5.6 - QNetworkReply完成（）从未调用过

2 个答案: