连接到Qt CPP中的摄像头时出现问题

Question

我正在Qt creator中运行一个简单的程序来连接到相机。当我运行程序时，会报告以下问题：

图形无法连接筛选器-2147467259[0x0]无法连接图形(操作已成功完成。(

有人能告诉我问题出在哪里吗？！任何解决方案都将不胜感激。感谢

Answer 1

我关注了你提到的链接。但我不明白解决这个问题的确切方法。

这是我用来连接相机的代码：

#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connected = false;
camera = new QCamera();
qDebug() << "Number of cameras found:" << QCameraInfo::availableCameras().count();
QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
foreach (const QCameraInfo &cameraInfo, cameras)
{
qDebug() << "Camera info:" << cameraInfo.deviceName() << cameraInfo.description() << cameraInfo.position();
ui->comboBox->addItem(cameraInfo.description());
}
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
if(!connected)
connectCamera();
else {
camera->stop();
viewfinder->deleteLater();
ui->pushButton->setText("Connect");
connected = false;
}
}
void MainWindow::connectCamera()
{
QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
foreach (const QCameraInfo &cameraInfo, cameras)
{
qDebug() << cameraInfo.description() << ui->comboBox->currentText();
if(cameraInfo.description()==ui->comboBox->currentText()) {
camera = new QCamera(cameraInfo, this);
viewfinder = new QCameraViewfinder(this);
camera->setViewfinder(viewfinder);
ui->horizontalLayout_2->addWidget(viewfinder);
connected = true;
ui->pushButton->setText("Disconnect");
camera->start();
return;
}
}
}