类实例化时的qt编译器错误

Question

我在编译dialog.h时遇到了问题，编译器抱怨QHostAddress::Any不是类型，在数字常量之前是预期的标识符。(在对话的第二行到最后一行)。

有人能告诉我为什么这不能编译吗？我正在实例化服务器对象，并传递服务器构造器所期望的参数.我认为.

dialog.h

#include <QWidget>
#include <QHostAddress>
#include "server.h"

class QLabel;
class QPushButton;

class Dialog : public QWidget
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = 0);

private:
    QLabel *statusLabel;
    QPushButton *quitButton;
    Server server;
};

服务器。h：

class Server : public QTcpServer
{
    Q_OBJECT

public:
    Server(QHostAddress listenAddress, quint16 listenPort, QObject *parent = 0);
    QHostAddress hostAddress;
    quint16 hostPort;

protected:
    void incomingConnection(qintptr socketDescriptor);

private:

};

dialog.cpp (部分)

Dialog::Dialog(QWidget *parent)
    : QWidget(parent), server(QHostAddress::Any, 4000)
{

server.cpp (部分)

#include "server.h"
#include "clientthread.h"

#include <stdlib.h>
Server(QHostAddress listenAddress, quint16 listenPort, QObject *parent = 0)
    : hostAddress(listenAddress), hostPort(listenPort), QTcpServer(parent)
{
}

以上注释代码已更新。现在编译器抱怨：

服务器构造函数定义中“listenAddress”之前的“预期”。

Answer 1

您需要将Server对象声明为Dialog类成员变量，而不是在构造函数中定义它。以下是Dialog类的外观：

dialog.h

#include <QWidget>
#include <QHostAddress>
#include "server.h"

class QLabel;
class QPushButton;

class Dialog : public QWidget
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = 0);

private:
    QLabel *statusLabel;
    QPushButton *quitButton;
    Server server; // Declare server member variable.
};

dialog.cpp

Dialog::Dialog(QWidget *parent)
:
    QWidget(parent),
    server(QHostAddress::Any, 4000) // construct server
{
    //...
}