QT使用QCamera打开USB相机并拍照保存指定文件夹
时间: 2023-08-02 13:06:26 浏览: 46
使用QT的QCamera打开USB相机并拍照保存到指定文件夹,你可以按照以下步骤实现:
1. 首先,需要在.pro文件中添加multimedia模块,添加方式如下:
```
QT += multimedia
```
2. 在代码中,需要引入QCamera和QCameraViewfinder类。
```c++
#include <QCamera>
#include <QCameraViewfinder>
```
3. 创建QCamera对象和QCameraViewfinder对象,并将它们关联起来。可以将QCameraViewfinder对象设置为QWidget或QGraphicsWidget的子类。
```c++
QCamera *camera = new QCamera(this);
QCameraViewfinder *viewfinder = new QCameraViewfinder(this);
viewfinder->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
viewfinder->resize(400, 300);
camera->setViewfinder(viewfinder);
```
4. 调用QCamera对象的searchAndLock()函数,查找可用的相机设备并锁定它。
```c++
camera->searchAndLock();
```
5. 调用QCamera对象的start()函数,启动相机。
```c++
camera->start();
```
6. 调用QCamera对象的capture()函数,拍照并保存到指定文件夹。
```c++
QString filePath = "/path/to/save/image.jpg";
QImageEncoderSettings settings;
settings.setCodec("image/jpeg");
settings.setResolution(640,480);
settings.setQuality(QMultimedia::HighQuality);
camera->setEncodingSettings(settings);
camera->capture(filePath);
```
完整代码示例:
```c++
#include <QCamera>
#include <QCameraViewfinder>
#include <QVBoxLayout>
#include <QPushButton>
#include <QImageEncoderSettings>
class CameraWidget : public QWidget
{
Q_OBJECT
public:
CameraWidget(QWidget *parent = nullptr) : QWidget(parent)
{
QVBoxLayout *layout = new QVBoxLayout(this);
viewfinder = new QCameraViewfinder(this);
viewfinder->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
viewfinder->resize(400, 300);
layout->addWidget(viewfinder);
QPushButton *captureButton = new QPushButton("Capture", this);
connect(captureButton, &QPushButton::clicked, this, &CameraWidget::capture);
layout->addWidget(captureButton);
camera = new QCamera(this);
camera->setViewfinder(viewfinder);
camera->searchAndLock();
camera->start();
}
private:
QCamera *camera;
QCameraViewfinder *viewfinder;
private slots:
void capture()
{
QString filePath = "/path/to/save/image.jpg";
QImageEncoderSettings settings;
settings.setCodec("image/jpeg");
settings.setResolution(640,480);
settings.setQuality(QMultimedia::HighQuality);
camera->setEncodingSettings(settings);
camera->capture(filePath);
}
};
```
这样就可以通过QT的QCamera打开USB相机并拍照保存到指定文件夹了。
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