Qt for Python

examples/qt/README.md

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+The sample demonstrates how to create a Python barcode app with Qt.
+
+## Python
+v3.7
+
+## Installation
+Qt for Python:
+
+```
+pip install pyside2
+```
+
+Download the [source code of Python barcode extension](https://github.com/dynamsoft-dbr/python/tree/master/src). Build and install it:
+
+```
+python setup.py build install
+```
+
+## License
+Get a [30-day trial license](https://www.dynamsoft.com/CustomerPortal/Portal/Triallicense.aspx) for free.
+
+## Usage
+Edit `barcode-reader.py` to update the license:
+
+```python
+dbr.initLicense("Your License")
+```
+
+Set the default path for opening image files:
+
+```python
+QFileDialog.getOpenFileName(self, 'Open file',
+                                               'E:\\Program Files (x86)\\Dynamsoft\\Barcode Reader 6.4.1\\Images', "Barcode images (*)")
+```
+
+Run the app:
+
+```
+python barcode-reader.py
+```
+
+<kbd><img src="https://www.codepool.biz/wp-content/uploads/2019/01/qt-python-barcode-reader.PNG" width="75%">

examples/qt/barcode-reader.py

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+import sys
+from PySide2.QtGui import QPixmap
+
+from PySide2.QtWidgets import QApplication, QLabel, QPushButton, QVBoxLayout, QWidget, QFileDialog, QTextEdit, QSizePolicy
+from PySide2.QtCore import Slot, Qt, QStringListModel, QSize
+
+import dbr
+import os
+
+class UI_Window(QWidget):
+
+    def __init__(self):
+        QWidget.__init__(self)
+
+        # The default barcode image.
+        dir_path = os.path.dirname(os.path.realpath(__file__))
+        filename = os.path.join(dir_path, 'image.tif')
+
+        # Create a layout.
+        layout = QVBoxLayout()
+
+        # Add a button
+        self.btn = QPushButton("Load an image")
+        self.btn.clicked.connect(self.pickFile)
+        layout.addWidget(self.btn)
+
+        # Add a label
+        self.label = QLabel()
+        self.label.setFixedSize(640, 640)
+        pixmap = self.resizeImage(filename)
+        self.label.setPixmap(pixmap)
+        layout.addWidget(self.label)
+
+        # Add a text area
+        self.results = QTextEdit()
+        self.readBarcode(filename)
+        layout.addWidget(self.results)
+
+        # Set the layout
+        self.setLayout(layout)
+        self.setWindowTitle("Dynamsoft Barcode Reader")
+        self.setFixedSize(800, 800)
+
+    def readBarcode(self, filename):
+        dbr.initLicense("Your License")
+        results = dbr.decodeFile(filename, 0x3FF | 0x2000000 | 0x4000000 | 0x8000000 | 0x10000000)
+
+        out = ''
+        index = 0
+        for result in results:
+            out += "Index: " + str(index) + "\n"
+            out += "Barcode format: " + result[0] + '\n'
+            out += "Barcode value: " + result[1] + '\n'
+            out += '-----------------------------------\n'
+            index += 1
+
+        self.results.setText(out)
+
+    def resizeImage(self, filename):
+        pixmap = QPixmap(filename)
+        lwidth = self.label.maximumWidth()
+        pwidth = pixmap.width()
+        lheight = self.label.maximumHeight()
+        pheight = pixmap.height()
+
+        wratio = pwidth * 1.0 / lwidth
+        hratio = pheight * 1.0 / lheight
+
+        if pwidth > lwidth or pheight > lheight:
+            if wratio > hratio:
+                lheight = pheight / wratio
+            else:
+                lwidth = pwidth / hratio
+
+            scaled_pixmap = pixmap.scaled(lwidth, lheight)
+            return scaled_pixmap
+        else:
+            return pixmap
+
+    def pickFile(self):
+        # Load an image file.
+        filename = QFileDialog.getOpenFileName(self, 'Open file',
+                                               'E:\\Program Files (x86)\\Dynamsoft\\Barcode Reader 6.4.1\\Images', "Barcode images (*)")
+        # Show barcode images
+        pixmap = self.resizeImage(filename[0])
+        self.label.setPixmap(pixmap)
+
+        # Read barcodes
+        self.readBarcode(filename[0])
+
+def main():
+    app = QApplication(sys.argv)
+    ex = UI_Window()
+    ex.show()
+    sys.exit(app.exec_())
+
+
+if __name__ == '__main__':
+    main()