Python使用qrcode库实现生成二维码的操作指南

pip install qrcode[pil]

import qrcode

# 创建QRCode对象
qr = qrcode.QRCode(
    version=1,  # 控制二维码的大小，值越大，二维码越复杂
    error_correction=qrcode.constants.ERROR_CORRECT_L,  # 错误修正级别
    box_size=10,  # 控制二维码中每个小模块的像素大小
    border=4,  # 控制二维码的边框大小
)

# 向二维码中添加数据
data = "https://www.example.com"
qr.add_data(data)
qr.make(fit=True)

# 生成二维码图像
img = qr.make_image(fill="black", back_color="white")

# 保存二维码图像
img.save("simple_qrcode.png")

from PIL import Image

# 生成二维码
qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_H,  # 设置较高的错误修正级别
    box_size=10,
    border=4,
)
qr.add_data(data)
qr.make(fit=True)
img = qr.make_image(fill="black", back_color="white")

# 添加 Logo
logo = Image.open("logo.png")  # 加载 logo 图像
logo = logo.convert("RGBA")  # 确保 logo 是 RGBA 格式
logo = logo.resize((50, 50))  # 调整 logo 大小

# 将 logo 放置到二维码的中心
qr_width, qr_height = img.size
logo_width, logo_height = logo.size
img.paste(logo, ((qr_width - logo_width) // 2, (qr_height - logo_height) // 2), logo)

# 保存带 logo 的二维码
img.save("qr_with_logo.png")

qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_H,
    box_size=10,
    border=4,
)
qr.add_data(data)
qr.make(fit=True)
img = qr.make_image(fill="black", back_color="white")
img.save("high_error_correction_qrcode.png")

img = qr.make_image(fill="blue", back_color="yellow")
img.save("custom_color_qrcode.png")

from fastapi import FastAPI
from fastapi.responses import StreamingResponse
import io
import qrcode

app = FastAPI()

@app.get("/generate_qr/")
def generate_qr(data: str):
    # 生成二维码
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=10,
        border=4,
    )
    qr.add_data(data)
    qr.make(fit=True)
    
    img = qr.make_image(fill="black", back_color="white")

    # 将图像保存到内存中并返回
    img_byte_arr = io.BytesIO()
    img.save(img_byte_arr, format="PNG")
    img_byte_arr.seek(0)
    return StreamingResponse(img_byte_arr, media_type="image/png")

urls = ["https://www.example1.com", "https://www.example2.com", "https://www.example3.com"]

for i, url in enumerate(urls):
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=10,
        border=4,
    )
    qr.add_data(url)
    qr.make(fit=True)
    img = qr.make_image(fill="black", back_color="white")
    img.save(f"qrcode_{i + 1}.png")