Catch Magick::Exception

Prevent crash when trying to convert a file to png. This was a hard one.
After checking into detached QT-Containers I finally realized that
convertArchivefileToPng was the culprit, because ImageMagick::read
exited with an "Unsupported marker type 0x09" execption.

After some more investigation with convert, or magick convert these
days, I found out that they could be ignored. Yes, it's a big hammer,
but if it still fails after trying to convert, just return if still
don't have a valid image.

2 files changed, 10 insertions, 4 deletions

diff --git a/helper.cpp b/helper.cpp
index 9398a06..a32d137 100644
--- a/helper.cpp
+++ b/helper.cpp
@@ -321,15 +321,17 @@ namespace Helper {
         QString newFn = data.at(0).toString();
         newFn.replace(QRegularExpression("(jpg|jpeg)$", QRegularExpression::CaseInsensitiveOption), "png");
         Magick::Image img;
-        img.read(data.at(3).toByteArray().data());
+        try {
+            img.read(data.at(3).toByteArray().data());
+        }
+        catch(Magick::Exception &) {}
+
         QTemporaryFile outFile("shemovconvertXXXXXX.png");
         if(outFile.open()){
             try {
                 img.write(outFile.fileName().toStdString());
             }
-            catch(Magick::Exception &) {
-                return retval;
-            }
+            catch(Magick::Exception &) {}
             outFile.rename(newFn);
             QString newMd5 = md5Sum(outFile.fileName());
             QString dest = moveToArchive(outFile.fileName(), newMd5, true);
diff --git a/pictureviewer2.cpp b/pictureviewer2.cpp
index e56f52a..1e49bdf 100644
--- a/pictureviewer2.cpp
+++ b/pictureviewer2.cpp
@@ -449,6 +449,10 @@ void PictureViewer2::showFile(const PicData &file){
     if(pixmap.isNull()){
         if(fi.canonicalFilePath().startsWith(mArchiveDir)){
             mCurPicData = Helper::convertArchivefileToPng(file);
+            if(mCurPicData.isEmpty()){
+                //convert failed even though ignoring errors
+                return;
+            }
             mFiles[mCurPos] = mCurPicData;
             if(!mCurPicData.isEmpty()){
                 pixmap = QPixmap(mCurPicData.at(3).toString());