這實際上是我在論壇上的第一個問題。所以我是一個Qt新手，我被這個小細節困住了。我正在創建這個應用程式來拍照并保存它們，但問題是它以“JPEG”格式保存，我需要它們為“PNG”或“GIF”或“tiff”，我試過了很多東西，但沒有任何效果，所以這是我的代碼：
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
_camera_view = new QCameraViewfinder();
_take_image_button = new QPushButton("Take Image");
_turn_camera_off = new QPushButton("Turn Off");
_turn_camera_on= new QPushButton("Turn On");
_central_widget = new QWidget();
setCentralWidget(_central_widget);
_setup_ui();
_setup_camera_devices();
set_camera(QCameraInfo::defaultCamera());
connect(_take_image_button, &QPushButton::clicked, [this]{
_image_capture.data()->capture();});
connect(_turn_camera_off, &QPushButton::clicked, [this]{_camera.data()->stop();});
connect(_turn_camera_on, &QPushButton::clicked, [this]{_camera.data()->start();});}
uj5u.com熱心網友回復：
你應該做QImage一些你的作業。它有save成員。參考檔案中的示例：
QImage image;
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
image.save(&buffer, "PNG"); // writes image into ba in PNG format
所以在背景關系中的用法QCameraImageCapture是這樣的：
QObject::connect(cap, &QCameraImageCapture::imageCaptured, [=] (int id, QImage img) {
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
img.save(&buffer, "PNG");
});
uj5u.com熱心網友回復：
對于將來可能遇到此問題的任何人，這是我找到的解決方案：
_image_capture->setCaptureDestination(QCameraImageCapture::CaptureToBuffer);
QObject::connect(_image_capture.data(), &QCameraImageCapture::imageCaptured, [=] (int id, QImage img) {
fileName = "image.png";
path = QStandardPaths::writableLocation(QStandardPaths::PicturesLocation) "/" fileName;
img.save(path, "PNG");
});
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