Question

我最近将一些qt项目从vs 2008升级到2013.我得到了一个奇怪的

Error   1   error C2228: left of '.currentText' must have class/struct/union

当我尝试访问我的gui中的组合框时出现

错误。

这是代码，很简单：

videopanel.h
#ifndef VIDEOPANEL_H
#define VIDEOPANEL_H

#include <QCamera>
#include <QtWidgets>
#include <QMediaRecorder>
#include <QCameraImageCapture>
#include <QCameraViewFinder>
#include <QVideoWidget>

namespace Ui {
class videoPanel;
}

class videoPanel : public QWidget
{
    Q_OBJECT

public:
    explicit videoPanel(QWidget *parent = 0);
    ~videoPanel();

private slots:
    void monitorToggle(int state);

private:

    Ui::videoPanel *ui;

    QCamera *camera;
    QList<QCameraInfo> cameraInfos;
    QCameraImageCapture *imageCapture;
    QMediaRecorder* mediaRecorder;

    QImageEncoderSettings imageSettings;
    QAudioEncoderSettings audioSettings;
    QVideoEncoderSettings videoSettings;
    QString videoContainerFormat;
    bool isCapturingVideo;

    void setCamera(void);

};

#endif // VIDEOPANEL_H

这里是cpp： videopanel.cpp

#include "videopanel.h"
#include "ui_videopanel.h"

#include <QMediaService>
#include <QMediaRecorder>
#include <QCameraViewfinder>
#include <QCameraInfo>
#include <QMediaMetaData>

#include <iostream>


videoPanel::videoPanel(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::videoPanel),
    camera(0),
    imageCapture(0),
    mediaRecorder(0)
{
    ui->setupUi(this); // fine!!!

    QObject::connect(ui->monitorCheck, SIGNAL(stateChanged(int)), this, SLOT(monitorToggle(int)) );



    // Camera devices:
    cameraInfos = QCameraInfo::availableCameras();
    // display device descriptions in combo box
    for (QList<QCameraInfo>::Iterator it = cameraInfos.begin();
        it != cameraInfos.end(); ++it)
        ui->cameraBox->addItem(it->description()); // fine!!!

}

videoPanel::~videoPanel()
{
    delete mediaRecorder;
    delete imageCapture;
    delete camera;
}

void videoPanel::setCamera(void) {

    delete imageCapture;
    delete mediaRecorder;
    delete camera;


    for (QList<QCameraInfo>::Iterator it = cameraInfos.begin();
        it != cameraInfos.end(); ++it)
        if (!it->description().compare(ui->cameraBox.currentText())) // not fine!!!
            camera = new QCamera(*it);

}


void videoPanel::monitorToggle(int state) {

    if (state == Qt::CheckState::Checked);
    std::cout << ui->cameraBox.currentText() << std::endl; // not fine!!!

}

我上面引用的错误来自第51和第60行，我尝试访问ui。

因此在构造函数中，编译器可以使用变量ui，但在其他方法中则不行。这是非常好的锅炉问题，所以我不确定问题是什么，但是，我怀疑VS中有一些标志会以某种方式模糊我的ui变量的范围。我所有其他私有变量都没问题，所以我不知道是什么问题。

我确信uic/moc进程正常运行，我尝试过清理和重建无效。

Answer 1

替换行：

if (!it->description().compare(ui->cameraBox.currentText()))
std::cout << ui->cameraBox.currentText() << std::endl;

人：

if (!it->description().compare(ui->cameraBox->currentText()))
std::cout << ui->cameraBox->currentText() << std::endl;

visual studio 2013神秘的C2228错误

1 个答案: