在QtCreator中使用oscpack时出现未定义的参考错误

问题描述 投票：1回答：1

我看过几篇类似的文章，但无法解决我的特定问题。

我要使用oscpack，如此处所述，http://www.rossbencina.com/code/oscpack

并在此处下载，https://github.com/hecomi/qml-osc然后单击“克隆或下载”按钮，然后单击“下载ZIP”链接。

注意：我以前的链接'https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/oscpack/oscpack_1_1_0.zip'不正确。

注2：我还在Ubuntu 18.04系统上安装了oscpack：

$ sudo apt-get -y install liboscpack-dev liboscpack1

在我的项目中包含此库之后-添加头文件的那一刻--我收到多个undefined reference错误；例如：

undefined reference to `UdpSocket::Connect(IpEndpointName const&)'

无论是否使用，我都会收到错误：

LIBS += -L"/developer/3rdPartyLibs/osc/lib" -loscpack # from the downloaded ZIP file

或

LIBS += -L"/usr/lib/x86_64-linux-gnu" -loscpack  # from the linux package

在我的SampleProject.pro文件中。

我在这里看到了一个非常相似的帖子/问题：Linking a static library to my project on Visual Studio 2010

而且我相信我有相同的错误，并且解决方案也类似（只是我在Ubuntu 18.04而不是Windows上进行开发）。我只是还没有弄清楚如何给链接器它所需要的。我希望链接器找不到与“ sys / sockets.h”关联的库，但我也不知道在哪里可以找到它。我正在使用Qt Creator 4.10.2和Qt_5_13_2_GCC_64bit-Debug。

如果您不熟悉QtCreator，但知道需要将哪些命令行参数传递给ld（和/或g ++），那仍然是一个很大的帮助-我可以尝试找出在哪里添加该参数。 IDE。

我怀疑此问题不需要其他信息，但是以防万一，下面的代码。

谢谢！

最小项目（main.qml）：

import QtQuick 2.13
import QtQuick.Controls 2.5
import QtQml 2.13
import OSC 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Scroll")


    Rectangle {
        width: 360
        height: 360
        Text {
            id: message
            anchors.centerIn: parent
        }
        OSCReceiver {
            port: 3333
            onMessage: {
                message.text = address + ' : ' + msg;
            }
        }
        OSCSender {
            id: osc
            ip: '127.0.0.1'
            port: 3333
        }
        Timer {
            property int cnt: 0
            interval: 1000/60
            running: true
            repeat: true
            onTriggered: {
                osc.send('/Hoge/cnt', ++cnt);
            }
        }
    }
}

项目文件（SampleProject.pro）：

QT += quick

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Refer to the documentation for the
# deprecated API to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
        main.cpp

RESOURCES += qml.qrc

LIBS += -L"/developer/3rdPartyLibs/osc/lib" -loscpack   # add for oscpack

INCLUDEPATH += /developer/3rdPartyLibs/osc              # add for oscpack
include(/developer/3rdPartyLibs/osc/osc.pri)            # add for oscpack

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

和main.cpp文件：

#include <QGuiApplication>
#include <QQmlApplicationEngine>

#include <osc_receiver.h> // add for oscpack
#include <osc_sender.h>   // add for oscpack

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    qmlRegisterType<OSCReceiver>("OSC", 1, 0, "OSCReceiver"); // add for oscpack
    qmlRegisterType<OSCSender>("OSC", 1, 0, "OSCSender");     // add for oscpack

    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

这是输出：

14:27:49：项目SampleProject的运行步骤...14:27:49：配置保持不变，跳过qmake步骤。14:27:50：开始：“ / usr / bin / make” -j8g ++ -Wl，-rpath，/ opt / Qt / 5.13.2 / gcc_64 / lib -o SampleProject main.o osc_sender.o osc_receiver.o qrc_qml.o moc_osc_sender.o moc_osc_receiver.o -L / developer / 3rdPartyLibs / osc / lib -loscpack /opt/Qt/5.13.2/gcc_64/lib/libQt5Quick.so /opt/Qt/5.13.2/gcc_64/lib/libQt5Gui.so /opt/Qt/5.13.2/gcc_64/lib/libQt5Qml.so /opt/Qt/5.13.2/gcc_64/lib/libQt5Network.so /opt/Qt/5.13.2/gcc_64/lib/libQt5Core.so -lGL -lpthread -loscpackosc_sender.o：在函数OSCSender::setIp(QString const&)': /developer/builds/qt/build-SampleProject-Desktop_Qt_5_13_2_GCC_64bit-Debug/../../../3rdPartyLibs/osc/osc_sender.cpp:21: undefined reference to UdpSocket :: Connect（IpEndpointName const＆）'osc_sender.o：在函数OSCSender::setPort(int)': /developer/builds/qt/build-SampleProject-Desktop_Qt_5_13_2_GCC_64bit-Debug/Makefile:255: recipe for target 'SampleProject' failed ../../../3rdPartyLibs/osc/osc_sender.cpp:38: undefined reference to UdpSocket :: Connect（IpEndpointName const＆）'osc_sender.o：在函数OSCSender::send(QString const&, QString const&)': /developer/builds/qt/build-SampleProject-Desktop_Qt_5_13_2_GCC_64bit-Debug/../../../3rdPartyLibs/osc/osc_sender.cpp:55 ... ...many similar lines... ... undefined reference to SocketReceiveMultiplexer ::〜SocketReceiveMultiplexer（）中/developer/builds/qt/build-SampleProject-Desktop_Qt_5_13_2_GCC_64bit-Debug/../../../3rdPartyLibs/osc/include/ip/UdpSocket.h:166：对UdpSocket::~UdpSocket()' osc_receiver.o: In function UdpListeningReceiveSocket :: Run（）的未定义引用'：/developer/builds/qt/build-SampleProject-Desktop_Qt_5_13_2_GCC_64bit-Debug/../../../3rdPartyLibs/osc/include/ip/UdpSocket.h:169：未定义对SocketReceiveMultiplexer::Run()' osc_receiver.o:(.data.rel.ro._ZTI25UdpListeningReceiveSocket[_ZTI25UdpListeningReceiveSocket]+0x10): undefined reference to typeinfo的UdpSocket引用collect2：错误：ld返回1退出状态make：*** [SampleProject]错误114:27:51：进程“ / usr / bin / make”以代码2退出。

c++ linux qt qml qt-creator
1个回答
1
投票

说明

问题是对在C ++中如何链接库的误解。集成oscpack的qml-osc项目使用静态链接（因此不必动态链接），但不幸的是liboscpack.a很老，产生了您观察到的问题。

解决方案

考虑到上述情况，我fork of qml-osc消除了静态库的依赖性，因此必须使用动态链接。

考虑到以上所述，您必须执行以下步骤：

  1. 安装liboscpack-dev
sudo apt-get install liboscpack-dev
  1. 清理您的项目，使其具有以下结构（您可以从here下载文件：]
├── 59331063.pro
├── main.cpp
├── main.qml
└── qml.qrc

。pro如下：

QT += quick
CONFIG += c++11
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += main.cpp
RESOURCES += qml.qrc

INCLUDEPATH += /usr/include/oscpack
LIBS += -loscpack 
include($$PWD/3rdPartyLibs/qml-osc/osc.pri)
  1. 然后创建一个名为3rdPartyLibs的文件夹并克隆我的存储库：
mkdir 3rdPartyLibs && cd 3rdPartyLibs && git clone https://github.com/eyllanesc/qml-osc.git

最后，项目必须具有以下结构：

├── 3rdPartyLibs
│   └── qml-osc
│       ├── LICENSE
│       ├── osc.pri
│       ├── osc_receiver.cpp
│       ├── osc_receiver.h
│       ├── osc_sender.cpp
│       ├── osc_sender.h
│       └── README.md
├── 59331063.pro
├── main.cpp
├── main.qml
└── qml.qrc

目前，我无法使用ubuntu访问计算机，因此为了测试以前的过程，我使用了以下Dockerfile

FROM ubuntu:18.04

MAINTAINER eyllanesc <[email protected]>

RUN apt-get update && \
    apt-get autoclean

RUN apt-get update && apt-get install \
  -y --no-install-recommends \
  git \
  ca-certificates \
  build-essential \ 
  qt5-default \
  qtdeclarative5-dev \
  qml-module-qtquick-controls \
  qml-module-qtquick-controls2 \
  qml-module-qtquick-window2  \
  liboscpack-dev

COPY app app

RUN mkdir app/3rdPartyLibs && \
    cd app/3rdPartyLibs && \
    git clone https://github.com/eyllanesc/qml-osc.git

RUN mkdir app/build && \
    cd app/build && \
    qmake .. && \
    make

CMD app/build/59331063

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