#Qt Creator #QCamera 예제

[참고]

Tutorial Qt Creator - QCamera(WebCam en C++)

https://www.youtube.com/watch?v=9oQZPqi47Y8

$ sudo apt-get update

$ sudo apt-get install qtmultimedia5-dev        // 우분투 16.04에 설치하기(QCamera 모듈 불러오려면 설치 필요)

(Qt5에서 실행)

1. Welcome - Project - New Project - Application - Qt Widgets Application 

2. Name : CameraTest - 작업폴더 지정 - Next

3. Kit Selection(데스크탑 or 임베디드 or 기타 ) 선택하기(동시선택 가능) - Next

4. Details - Class Information - Base class: - QWidget 선택 - Next - Finish

5. code 작성

"CameraTest.pro"

QT += core gui multimedia multimediawidgets    // 멀티미디어 모듈을 모듈화

(...생략...)                                                     // 자동생성

QMAKE_CXXFLAGS += -std=gnu++14              // 표준 2014 추가

"widget.h"

(...생략...)                                                    //자동생성

class QCamera;

class QCameraViewfinder;

class QCameraImageCaputre;

class QVBoxLayout;

class Widget : public Qwidget

{

Q_OBJECT

public:

explicit Widget(QWidget *parent = nullptr); // 0을 nullptr로 변경

~Widget();

private:

Ui::Widget *ui;

QCamera *mCamera;

QCameraViewfinder *mCameraViewfinder;

QCameraImageCapture *mCameraImageCaputre;

QVBoxLayout *mLayout;

};

#endif

"widget.cpp"

#include "widget.h"

#include "ui_widget.h"

#include <QCamera>

#include <QCameraViewfinder>

#include <QCameraImageCapture>

#include <QVBoxLayout>

Widget::Widget(QWidget *parent) :

QWidget(parent),

ui(new Ui::Widget)

{

ui->setupUi(this);

mCamera = new QCamera(this);

mCameraViewfinder = new QCameraViewfinder(this);

mCameraImageCaputre = new QCameraImageCapture(mCamera, this);

mLayout = new QVBoxLayout;

mLayout ->addItem(mCameraViewfinder);

}

Widget::~Widget()

{

delete ui;

}

"widget.ui" (Design 영역. 코딩이 아닌 Drag&Drop으로 UI 만들기)

전 Object Name : optionPushButton 으로 함

"widget.h"

(...생략...)                                                    //자동생성

class QCamera;

class QCameraViewfinder;

class QCameraImageCaputre;

class QVBoxLayout;

class QMenu;

class QAction;

class Widget : public Qwidget

{

Q_OBJECT

public:

explicit Widget(QWidget *parent = nullptr); // 0을 nullptr로 변경

~Widget();

private:

Ui::Widget *ui;

QCamera *mCamera;

QCameraViewfinder *mCameraViewfinder;

QCameraImageCapture *mCameraImageCaputre;

QVBoxLayout *mLayout;

QMenu *mOpcionesMenu;

QAction *mEncenderAction;

QAction *mApagarAction;

QAction *mCapturarAction;

};

#endif

"widget.cpp"

#include "widget.h"

#include "ui_widget.h"

#include <QCamera>

#include <QCameraViewfinder>

#include <QCameraImageCapture>

#include <QVBoxLayout>

#include <QMenu>

#include <QAction>

Widget::Widget(QWidget *parent) :

QWidget(parent),

ui(new Ui::Widget)

{

ui->setupUi(this);

mCamera = new QCamera(this);

mCameraViewfinder = new QCameraViewfinder(this);

mCameraImageCaputre = new QCameraImageCapture(mCamera, this);

mLayout = new QVBoxLayout;

mOpcionesMenu = new QMenu("Option", this);

mEncenderAction = new QAction("Encender", this);

mApagarAction = new QAction("Apagar", this);

mCapturarAction = new QAction("Capturar", this);

mOptionMenu->addAction({mEncenderAction, mApagarAction, mCapturarAction});

ui->optionPushButton->setMenu(mOptionMenu);

mCamera->setViewfinder(mCameraViewfinder);

mLayout->addWidget(mCameraViewfinder);   //Item을 Widget으로 수정

mLayout->setMargin(0);

ui->scrollArea->setLayout(mLayout);

connect(mEncenderAction, &QAction::triggered, [&](){

mCamera->start();

});

connect(mAagarAction, &QAction::triggered, [&](){

mCamera->stop();

});

connect(mCapturarAction, &QAction::triggered, [&](){

});

}

Widget::~Widget()

{

delete ui;

}

"main.cpp"

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

a.setStyple("fusion")

Widget w;

w.show();

return a.exec();

}

"widget.cpp"

#include "widget.h"

#include "ui_widget.h"

#include <QCamera>

#include <QCameraViewfinder>

#include <QCameraImageCapture>

#include <QVBoxLayout>

#include <QMenu>

#include <QAction>

#include <QFileDialog>

Widget::Widget(QWidget *parent) :

QWidget(parent),

ui(new Ui::Widget)

{

ui->setupUi(this);

mCamera = new QCamera(this);

mCameraViewfinder = new QCameraViewfinder(this);

mCameraImageCaputre = new QCameraImageCapture(mCamera, this);

mLayout = new QVBoxLayout;

mOpcionesMenu = new QMenu("Option", this);

mEncenderAction = new QAction("Encender", this);

mApagarAction = new QAction("Apagar", this);

mCapturarAction = new QAction("Capturar", this);

mOptionMenu->addAction({mEncenderAction, mApagarAction, mCapturarAction});

ui->optionPushButton->setMenu(mOptionMenu);

mCamera->setViewfinder(mCameraViewfinder);

mLayout->addWidget(mCameraViewfinder);   //Item을 Widget으로 수정

mLayout->setMargin(0);

ui->scrollArea->setLayout(mLayout);

connect(mEncenderAction, &QAction::triggered, [&](){

mCamera->start();

});

connect(mAagarAction, &QAction::triggered, [&](){

mCamera->stop();

});

connect(mCapturarAction, &QAction::triggered, [&](){

auto filename = QFileDialog::getSaveFileName(this, "Capturar", "/", "Imgae(*.jpg;*.jpeg)");

if (filename.isEmpty()){

return;

}

mCameraImageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);

QImageEncoderSettings imageEncorderSettings;

imageEncorderSettings.setCodec("image/jpeg");

imageEncorderSettings.setResolution(1288, 964);

mCameraImageCapture->setEncodingSettings(imageEncorderSettings);

mCamera->setCaptureMode(QCamera::CaptureStillImage);

mCamera->start();

mCamera->searchAndLock();

mCameraImageCapture->capture(filename);

mCamera->unlock();

});

}

Widget::~Widget()

{

delete ui;

}

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