Qt结合OPenCv截图小工具

#include "capvideowidget.h" #include "ui_capvideowidget.h" #include <QBitArray> #include <QIntValidator> constexpr int INITIAL_VOLUMN = 60; constexpr int DEFAULE_CUT_SPACE = 10; constexpr int MAX_SPACE = 1000; CapVideoWidget::CapVideoWidget(QWidget *parent) : QWidget(parent) , whetherPlaying(true) , ui(new Ui::CapVideoWidget) { ui->setupUi(this); this->setWindowTitle(QString("视频截图工具")); player = new QMediaPlayer; player->setVideoOutput(ui->playWidget); ui->frameSpaceEdit->setValidator(new QIntValidator(0, MAX_SPACE, this)); // 获取视频总时长 QObject::connect(player, &QMediaPlayer::durationChanged, this, &CapVideoWidget::getVideoDuration); connect(player, &QMediaPlayer::positionChanged, this, &CapVideoWidget::playerPosChange); } CapVideoWidget::~CapVideoWidget() { delete ui; } void CapVideoWidget::on_videoImportBtn_clicked() { openVideoName = QFileDialog::getOpenFileName(this, QString("打开目录"), "/"); player->setMedia(QUrl::fromLocalFile(openVideoName)); player->setVolume(INITIAL_VOLUMN); QByteArray opencvName=openVideoName.toLatin1(); const char *openName=opencvName.data(); capVideoPic.open(openName); if (!capVideoPic.isOpened()) { ui->textBrowser->insertPlainText(QString("Opencv读取视频失败") + "\n"); } else { realFrameNum=(static_cast<long>(capVideoPic.get(cv::CAP_PROP_FRAME_COUNT))); // 获取视频总帧数 capVideoPic.release(); ui->totalFrameLabel->setText(QString::number(realFrameNum)); } } void CapVideoWidget::on_playAndSuspendBtn_clicked() { if (openVideoName.isEmpty()) { ui->textBrowser->textCursor().insertText(QString("请检查视频是否已导入！！！") + "\n"); return; } if (whetherPlaying) { player->play(); whetherPlaying = false; } else { player->pause(); whetherPlaying = true; } } void CapVideoWidget::on_voiceSlider_valueChanged(int value) { player->setVolume(value); } void CapVideoWidget::getVideoDuration(qint64 playTime) { playTime = player->duration(); videoTime = playTime; // 记录视频总时长 ui->playPosBar->setMaximum(static_cast<int>(playTime)); ui->totalTimeLabel->setText(formatTime(videoTime)); } void CapVideoWidget::playerPosChange(qint64 posChange) { ui->curTimeLabel->setText(formatTime(posChange)); ui->playPosBar->setValue(static_cast<int>(posChange)); ui->totalTimeLabel->setText(formatTime(videoTime - posChange)); // 总时长-已播时长 } QString CapVideoWidget::formatTime(qint64 mSencond) { qint64 hourTime = mSencond / (1000 * 3600); qint64 minuteTime = (mSencond - hourTime * 1000 * 3600) / (1000 * 60); qint64 secondTime = (mSencond - hourTime * 1000 * 3600 - minuteTime * 1000 * 60) / 1000; QString time = QString("%1:%2:%3").arg(hourTime, 2, 10, QLatin1Char('0')).arg(minuteTime, 2, 10, QLatin1Char('0')).arg(secondTime, 2, 10, QLatin1Char('0')); return time; } void CapVideoWidget::on_startCapBtn_clicked() { if (openVideoName.isEmpty()) { ui->textBrowser->textCursor().insertText(QString("请检查视频是否已导入！！！") + "\n"); return; } int frameSpace = 0; ui->frameSpaceEdit->text().isEmpty() ? frameSpace = DEFAULE_CUT_SPACE : frameSpace = spaceNum.toInt(); QByteArray opencvName=openVideoName.toLatin1(); const char *openName=opencvName.data(); capVideoPic.open(openName); if (capVideoPic.isOpened()) { QString allPath = saveDirPath; for (int i = 0; i < realFrameNum; ++i) { cv::Mat perFrame; capVideoPic>>perFrame; if (i % frameSpace == 0) { QString tempSuffixStr = suffixStr + QString("%1").arg(i, 5, 10, QLatin1Char('0')); allPath = saveDirPath + tempSuffixStr + ".jpg"; QByteArray finalSaveName = allPath.toLatin1(); const char *cStyleName = finalSaveName.data(); cv::imwrite(cStyleName, perFrame) ? ui->textBrowser->textCursor().insertText(allPath + "\n") : ui->textBrowser->textCursor().insertText(QString("Opencv保存图片异常！！！") + "\n"); allPath = ""; } } ui->textBrowser->textCursor().insertText(QString("保存完成") + "\n"); } } void CapVideoWidget::on_savePicBtn_clicked() { saveDirPath = QFileDialog::getExistingDirectory(this, QString("imwritePath"), "../"); saveDirPath = saveDirPath + "/"; ui->roadShowLabel->setText(saveDirPath); } void CapVideoWidget::on_prefixEdit_textEdited(const QString &prefixStr) { suffixStr = prefixStr; } void CapVideoWidget::on_stopCapBtn_clicked() { capVideoPic.release(); ui->textBrowser->textCursor().insertText(QString("终止截图.") + "\n"); } void CapVideoWidget::on_frameSpaceEdit_textEdited(const QString &cutSpace) { spaceNum = cutSpace; }