VS2013与QT5.3.2使用Websocket，并得到一个未解决的外部符号问题

VS2013 with QT5.3.2 using Websocket and got a unresolved external symbol issue

本文关键字：一个 未解决 问题 符号 外部 QT5 使用 Websocket VS2013      更新时间：2023-10-16

我遇到了VS2013和QT5.3.2的问题。当我使用Websocket时，它会用QWebSocket:：sendTextMessage和其他Websocket函数显示未解析的外部符号。

我已经#include <QtWebSockets/QWebSocket>并设置了QT项目设置，并检查了WebKit和网络模块。

这是我收到的完整错误信息：

1>mainwindow.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QWebSocket::~QWebSocket(void)" (__imp_??1QWebSocket@@UAE@XZ)，referenced in function "public: virtual __thiscall MWebSocket::~MWebSocket(void)" (??1MWebSocket@@UAE@XZ) 
1>MWebSocket.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QWebSocket::~QWebSocket(void)" (__imp_??1QWebSocket@@UAE@XZ)
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QWebSocket::QWebSocket(class QString const &,enum QWebSocketProtocol::Version,class QObject *)" (__imp_??0QWebSocket@@QAE@ABVQString@@W4Version@QWebSocketProtocol@@PAVQObject@@@Z)，referenced in function "public: __thiscall MWebSocket::MWebSocket(class QUrl const &,class QObject *)" (??0MWebSocket@@QAE@ABVQUrl@@PAVQObject@@@Z) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __int64 __thiscall QWebSocket::sendTextMessage(class QString const &)" (__imp_?sendTextMessage@QWebSocket@@QAE_JABVQString@@@Z)，referenced in function "private: void __thiscall MWebSocket::onConnected(void)" (?onConnected@MWebSocket@@AAEXXZ) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWebSocket::close(enum QWebSocketProtocol::CloseCode,class QString const &)" (__imp_?close@QWebSocket@@QAEXW4CloseCode@QWebSocketProtocol@@ABVQString@@@Z)，referenced in function "private: void __thiscall MWebSocket::onTextMessageReceived(class QString)" (?onTextMessageReceived@MWebSocket@@AAEXVQString@@@Z) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWebSocket::open(class QUrl const &)" (__imp_?open@QWebSocket@@QAEXABVQUrl@@@Z)，referenced in function "public: __thiscall MWebSocket::MWebSocket(class QUrl const &,class QObject *)" (??0MWebSocket@@QAE@ABVQUrl@@PAVQObject@@@Z) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWebSocket::connected(void)" (__imp_?connected@QWebSocket@@QAEXXZ)，referenced in function "public: __thiscall MWebSocket::MWebSocket(class QUrl const &,class QObject *)" (??0MWebSocket@@QAE@ABVQUrl@@PAVQObject@@@Z) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWebSocket::disconnected(void)" (__imp_?disconnected@QWebSocket@@QAEXXZ)，referenced in function "public: __thiscall MWebSocket::MWebSocket(class QUrl const &,class QObject *)" (??0MWebSocket@@QAE@ABVQUrl@@PAVQObject@@@Z) 
1>MWebSocket.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWebSocket::textMessageReceived(class QString const &)" (__imp_?textMessageReceived@QWebSocket@@QAEXABVQString@@@Z)，referenced in function "private: void __thiscall MWebSocket::onConnected(void)" (?onConnected@MWebSocket@@AAEXXZ) 
1>MWebSocket.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: static struct QMetaObject const QWebSocket::staticMetaObject" (__imp_?staticMetaObject@QWebSocket@@2UQMetaObject@@B)
1>debug/MapleUI.exe : fatal error LNK1120: 9 unresolved externals

这是Websocket:的代码

//HEADER
#pragma once
#include "global.h"

class MWebSocket : public QObject
{
    Q_OBJECT
public:
    explicit MWebSocket(const QUrl &url, QObject *parent = Q_NULLPTR);
Q_SIGNALS:
    void closed();
    private Q_SLOTS:
    void onConnected();
    void onTextMessageReceived(QString message);
private:
    QWebSocket m_webSocket;
    QUrl m_url;
};

//CPP
#include "global.h"
#include "MWebSocket.h"
QT_USE_NAMESPACE
//! [constructor]
MWebSocket::MWebSocket(const QUrl &url, QObject *parent) :
QObject(parent),
m_url(url)
{
    connect(&m_webSocket, &QWebSocket::connected, this, &MWebSocket::onConnected);
    connect(&m_webSocket, &QWebSocket::disconnected, this, &MWebSocket::closed);
    m_webSocket.open(QUrl(url));
}
//! [constructor]
//! [onConnected]
void MWebSocket::onConnected()
{
    qDebug() << "WebSocket connected";
    connect(&m_webSocket, &QWebSocket::textMessageReceived,
        this, &MWebSocket::onTextMessageReceived);
    m_webSocket.sendTextMessage(QStringLiteral("H2ello, world!"));
}
//! [onConnected]
//! [onTextMessageReceived]
void MWebSocket::onTextMessageReceived(QString message)
{
    qDebug() << "Message received:" << message;
    m_webSocket.close();
}
//! [onTextMessageReceived]

我该如何解决这个问题？

只要发现将Qt5WebSocketsd.lib添加到项目中就能解决问题。我不知道为什么这需要手动，因为之前当我使用其他libs QT5插件时，会添加它们来自动

根据手册：

Header: #include <QWebSocketServer>
qmake:  QT += websockets
Since:  Qt 5.3
Inherits:   QObject
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