Display an error, rather than crashing, if encoding a QR Code failed.

(master workaround in b1a99c3a1fb2613e9c7cecd565e8cc604b03eb6f + 7261945eb5f64423d47a5bff63ecd8b65d88b8ed)

1 files changed, 19 insertions, 9 deletions

diff --git a/src/qt/qrcodedialog.cpp b/src/qt/qrcodedialog.cpp
index 82959831de..9cf50b0e58 100644
--- a/src/qt/qrcodedialog.cpp
+++ b/src/qt/qrcodedialog.cpp
@@ -39,17 +39,27 @@ void QRCodeDialog::genCode()
     QString uri = getURI();
     //qDebug() << "Encoding:" << uri.toUtf8().constData();
     QRcode *code = QRcode_encodeString(uri.toUtf8().constData(), 0, QR_ECLEVEL_L, QR_MODE_8, 1);
-    myImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
-    myImage.fill(0xffffff);
-    unsigned char *p = code->data;
-    for(int y = 0; y < code->width; y++) {
-        for(int x = 0; x < code->width; x++) {
-            myImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
-            p++;
+    if (code)
+    {
+        ui->lblQRCode->setText("");
+
+        QRcode *code = QRcode_encodeString(uri.toUtf8().constData(), 0, QR_ECLEVEL_L, QR_MODE_8, 1);
+        myImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
+        myImage.fill(0xffffff);
+        unsigned char *p = code->data;
+        for (int y = 0; y < code->width; y++)
+        {
+            for (int x = 0; x < code->width; x++)
+            {
+                myImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
+                p++;
+            }
         }
+        QRcode_free(code);
+        ui->lblQRCode->setPixmap(QPixmap::fromImage(myImage).scaled(300, 300));
     }
-    QRcode_free(code);
-    ui->lblQRCode->setPixmap(QPixmap::fromImage(myImage).scaled(300, 300));
+    else
+        ui->lblQRCode->setText(tr("Error encoding URI into QR Code; try to reduce the text for label / message."));
 }
 
 QString QRCodeDialog::getURI()