init

main.py

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+from pathlib import Path
+import os
+import time
+import logging
+from watchdog.observers import Observer
+from watchdog.events import LoggingEventHandler
+
+from pdf2image import convert_from_path
+
+labelPathDir = "/home/jan/Downloads/"
+
+labelPath = labelPathDir + "label.pdf"
+labelPathRot90 = labelPathDir + "label_rot90.pdf"
+
+
+printer_identifier = "tcp://192.168.1.70"
+dpi = 300
+
+imageHeight29mm = 343
+imageHeight62mm = 745
+imageHeightVersand102 = 3505
+
+
+def checkTolerance(isNum, shouldNum):
+    tol = 10
+    maxNum = shouldNum + tol
+    minNum = shouldNum - tol
+    return (isNum < maxNum and isNum > minNum)
+
+
+def printPDF(path):
+    if (os.path.isfile(path)):
+        print("label detected", path)
+        pages = convert_from_path(path, dpi)
+        for page in pages:
+
+            try:
+                page.save('label.png', 'PNG')
+
+                pngHeight = page.height
+                if (path == labelPathRot90):
+                    pngHeight = page.width
+                print("height: ", pngHeight)
+
+                labelHeight = 0
+
+                if (checkTolerance(pngHeight, imageHeight29mm)):
+                    labelHeight = 29
+                if (checkTolerance(pngHeight, imageHeight62mm)):
+                    labelHeight = 62
+
+                if (checkTolerance(pngHeight, imageHeightVersand102)):
+                    labelHeight = 102
+                    h = page.height/2
+                    spacing = 100
+
+                    # box=(left, upper, right, lower)
+                    page.crop((0, spacing, page.width, h-spacing)
+                              ).save('label.png', 'PNG')
+
+                if (labelHeight != 0):
+                    os.system('brother_ql -m QL-1060N -p ' +
+                              printer_identifier + ' print -d -l ' + str(labelHeight) + ' label.png -r 90')
+                else:
+                    print("UNKNOWN LABEL PICTURE HEIGHT!")
+            except:
+                print("An exception occurred")
+        os.remove(path)
+
+
+printPDF(labelPath)
+printPDF(labelPathRot90)
+
+
+class Event(LoggingEventHandler):
+    def on_modified(self, event):
+        path = event.src_path
+        if (path == labelPath or path == labelPathRot90):
+            printPDF(path)
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO,
+                        format='%(asctime)s - %(message)s',
+                        datefmt='%Y-%m-%d %H:%M:%S')
+    path = labelPathDir  # sys.argv[1] if len(sys.argv) > 1 else '.'
+    event_handler = Event()
+    observer = Observer()
+    observer.schedule(event_handler, path, recursive=True)
+    observer.start()
+    try:
+        while True:
+            time.sleep(1)
+    except KeyboardInterrupt:
+        observer.stop()
+    observer.join()

requirements.txt

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+brother_ql
+watchdog
+pdf2image