Automatisierte Screenshot Aufnahme per [SCREENSHOT] datei implementiert

src/videowidget.cpp

@@ -2,6 +2,7 @@
 
 #include <QPainter>
 #include <QFileDialog>
+#include <QFileInfo>
 #include <QDir>
 #include <QDateTime>
 #include <QStandardPaths>
@@ -164,6 +165,55 @@ void VideoWidget::onScreenshot()
         m_frame.save(path);
 }
 
+void VideoWidget::saveAutoScreenshot(const QString &filename)
+{
+    if (m_frame.isNull()) {
+        emit autoScreenshotResult(false,
+            tr("[SCREENSHOT] tag received, but no video frame is available yet."));
+        return;
+    }
+    if (m_autoScreenshotDir.isEmpty()) {
+        emit autoScreenshotResult(false,
+            tr("[SCREENSHOT] tag received, but no auto-screenshot folder is "
+               "configured (toolbar → \"Screenshot folder…\")."));
+        return;
+    }
+
+    // Only take the bare filename from what the firmware sent - this
+    // strips any directory components (incl. attempts at '../' path
+    // traversal), so the firmware can never dictate where on disk we
+    // write. Fall back to a timestamp if it sent nothing usable, and
+    // default to .png if it didn't specify an extension.
+    QString name = QFileInfo(filename.trimmed()).fileName();
+    if (name.isEmpty()) {
+        name = QStringLiteral("screenshot_%1.png")
+            .arg(QDateTime::currentDateTime().toString("yyyyMMdd_hhmmss_zzz"));
+    } else if (QFileInfo(name).suffix().isEmpty()) {
+        name += QStringLiteral(".png");
+    }
+
+    const QDir dir(m_autoScreenshotDir);
+    QString path = dir.filePath(name);
+
+    // Don't silently overwrite an earlier capture if the firmware reuses
+    // the same filename on every trigger (e.g. a generic "dump.png") -
+    // append a numeric suffix instead so nothing gets lost.
+    if (QFileInfo::exists(path)) {
+        const QString base   = QFileInfo(name).completeBaseName();
+        const QString suffix = QFileInfo(name).suffix();
+        int n = 1;
+        do {
+            path = dir.filePath(QStringLiteral("%1_%2.%3").arg(base).arg(n).arg(suffix));
+            ++n;
+        } while (QFileInfo::exists(path));
+    }
+
+    if (m_frame.save(path))
+        emit autoScreenshotResult(true, tr("Screenshot saved: %1").arg(path));
+    else
+        emit autoScreenshotResult(false, tr("Failed to save screenshot to %1").arg(path));
+}
+
 void VideoWidget::onNewFrame(const QImage &frame)
 {
     // Feed the recorder regardless of freeze state, so pausing the preview