Question

我尝试编译一些Qt项目，但出现链接器错误。我想做一个读取蓝牙低功耗（BLE）Gatt特性的小项目。我有一个BLE可以工作的嵌入式板。

当我启动编译器我得到论文警告/错误：

qtmain.lib(qtmain_winrt.obj):-1: Warnung: LNK4099: PDB "qtmain.pdb" wurde nicht mit "qtmain.lib(qtmain_winrt.obj)" oder an "C:\Users\Kennis\Documents\build-Bachlerorarbeit-Qt_5_11_2_for_UWP_64bit_MSVC_2017-Profile\release\qtmain.pdb" gefunden; Objekt wird verknüpft, als ob keine Debuginformationen vorhanden wären.

widget.obj:-1: error LNK2019: unresolved external symbol ""__declspec(dllimport) public: __cdecl QBluetoothDeviceDiscoveryAgent::QBluetoothDeviceDiscoveryAgent(class QObject *)" (__imp_??0QBluetoothDeviceDiscoveryAgent@@QEAA@PEAVQObject@@@Z)" referenced in function""public: __cdecl Widget::Widget(class QWidget *)" (??0Widget@@QEAA@PEAVQWidget@@@Z)".

widget.obj:-1: error LNK2019: unresolved external symbol ""__declspec(dllimport) public: virtual __cdecl QBluetoothDeviceDiscoveryAgent::~QBluetoothDeviceDiscoveryAgent(void)" (__imp_??1QBluetoothDeviceDiscoveryAgent@@UEAA@XZ)" referenced in function ""public: virtual void * __cdecl QBluetoothDeviceDiscoveryAgent::`scalar deleting destructor'(unsigned int)" (??_GQBluetoothDeviceDiscoveryAgent@@UEAAPEAXI@Z)".

widget.obj:-1: error LNK2001: unresolved external symbol""public: virtual struct QMetaObject const * __cdecl QBluetoothDeviceDiscoveryAgent::metaObject(void)const " (?metaObject@QBluetoothDeviceDiscoveryAgent@@UEBAPEBUQMetaObject@@XZ)".

widget.obj:-1: error LNK2001: unresolved external symbol ""public: virtual struct QMetaObject const * __cdecl QBluetoothDeviceDiscoveryAgent::metaObject(void)const " (?metaObject@QBluetoothDeviceDiscoveryAgent@@UEBAPEBUQMetaObject@@XZ)".

widget.obj:-1: error LNK2001: unresolved external symbol ""public: virtual void * __cdecl QBluetoothDeviceDiscoveryAgent::qt_metacast(char const *)" (?qt_metacast@QBluetoothDeviceDiscoveryAgent@@UEAAPEAXPEBD@Z)".
:

我在Windows 10工作用Qt5.11.2为UWP 64位（MSVC 2017）。

，而不的发现代理i'm能够编译该项目初始化的线路。

我已经启动Qmake并重建了多次。

main.cpp：

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

widget.cpp：

#include "widget.h"
#include "ui_widget.h"

#include <QtBluetooth/QBluetoothDeviceDiscoveryAgent>
#include <QtBluetooth/QBluetoothDeviceInfo>


Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
}

Widget::~Widget()
{
    delete ui;
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

#include <QtBluetooth/QBluetoothDeviceDiscoveryAgent>
#include <QtBluetooth/QBluetoothDeviceInfo>


namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

    QBluetoothDeviceDiscoveryAgent *discoveryAgent;

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

bachelorarbeit.pro：

#-------------------------------------------------
#-------------------------------------------------
#
# Project created by QtCreator 2019-02-02T21:22:40
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Bachlerorarbeit
TEMPLATE = app

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

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain 
version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the 
APIs deprecated before Qt 6.0.0

CONFIG += c++11

SOURCES += \
        main.cpp \
        widget.cpp

HEADERS += \
        widget.h

FORMS += \
        widget.ui



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

为什么编译Qt BluetoothDiscoveryAgent会导致链接器错误

0 个答案: