pil example memopri (snippet)

Python pil example 'memopri'

Modules used in program:

• import PIL, PIL.Image, PIL.ImageOps
• import sys, socket, struct

python memopri

Python pil example: memopri

#!/usr/bin/python3
import sys, socket, struct
import PIL, PIL.Image, PIL.ImageOps

DENSITY_MIN = 0
DENSITY_LIGHT = 1
DENSITY_NORMAL = 2
DENSITY_HEAVY = 3
DENSITY_MAX = 4

WHITESPACE_NONE = 0
WHITESPACE_BEFORE = 1
WHITESPACE_AFTER = 2

class MemoPri(object):
    def __init__(self, host, port=16402):
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.s.connect((host, port))

    @classmethod
    def find(cls):
        stx = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        srx = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        srx.bind(("0.0.0.0", 49168))
        stx.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        srx.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        stx.connect(("255.255.255.255", 49167))
        stx.send(b"MEP r2", 0)
        data, (ip, port) = srx.recvfrom(128)
        name = data.split(b"\0")[0].decode("utf-8")
        print("Found printer %s at %s" % (name, ip))
        return cls(ip)

    def cmd(self, cmd, replylen=1):
        self.s.sendall(bytes(cmd))
        v = self.s.recv(replylen)
        print(("< %r" % v))
        return v

    def print(self, img, whitespace=WHITESPACE_NONE, density=DENSITY_NORMAL):
        self.cmd([0x1b, 0x5a])
        self.cmd([0x05], 6)
        self.cmd([0x06])
        self.cmd([0x1b, 0x49])
        self.cmd([0x05], 8)
        self.cmd([0x06])
        self.cmd([0x1b, 0x46])
        self.cmd([0x05], 8)
        self.cmd([0x06])
        self.cmd([0x1b, 0x50])
        rows, data = self.format_data(img)
        length = rows * 16
        self.cmd(
            bytes([0x02, 0x80, 0x0c, 0x00, 0x00, 0x00, whitespace, density,
             0x80, 0x00]) + struct.pack("<HHxx", rows, length)
        )
        self.cmd([0x1b, 0x56])
        print("Sending data...")
        for i in range(0, len(data), 0x200):
            self.cmd(data[i:i+0x200])
        print("Printing...")
        self.cmd([0x1b, 0x42])

    def format_data(self, img, dither=True):
        img = img.transpose(PIL.Image.TRANSPOSE)
        img = img.convert("L")
        img = PIL.ImageOps.invert(img)
        img = img.convert("1", dither=(PIL.Image.FLOYDSTEINBERG if dither else PIL.Image.NONE))
        rows = img.height
        assert img.width <= 96
        canvas = PIL.Image.new("1", (128, rows))
        canvas.paste(img, ((128 - img.width)//2, 0))
        data = canvas.tobytes()
        assert len(data) % 0x10 == 0
        if len(data) & 0x1ff:
            data += b'\x00' * (0x200 - (len(data) & 0x1ff))
        assert len(data) % 0x200 == 0
        return rows, data

if __name__ == "__main__":
    m = MemoPri.find()
    m.print(PIL.Image.open(sys.argv[1]))
    print("Done!")

Python links

• Learn Python: https://pythonbasics.org/
• Python Tutorial: https://pythonprogramminglanguage.com