使用pyfpdf将Base64图像插入pdf [英] Insert Base64 image to pdf using pyfpdf

问题描述

我在python中使用pyfpdf生成pdf文件.我有一个Base64，我想插入到pdf文件中，而不必将其另存为文件系统中的图像.但是pyfpdf图片功能仅接受文件路径.

I'm using pyfpdf in python to generate pdf files. I have a Base64 which I want to insert into a pdf file without having to save it as an image in my file system. But the pyfpdf image function only accepts file path.

fpdf.image(name, x = None, y = None, w = 0, h = 0, type = '', link = '')

是否有一种方法(破解)直接从内存中插入base64或缓冲的图像，而无需事先保存到文件系统中?我什至在github上检查了它们的源代码，无法确定.

Is there a way (hack) to directly insert base64 or buffered image from memory, without having to save into the file system beforehand? I even checked their source code on github and couldn't figure.

链接: https://github.com/reingart/pyfpdf/tree/master /fpdf

推荐答案

正如注释中提到的@pvg一样，用base64功能覆盖load_resource函数可以解决问题.

As @pvg mentioned in the comments, overriding load_resource function with your base64 functionality does the trick.

import base64,io

def load_resource(self, reason, filename):
    if reason == "image":
        if filename.startswith("http://") or filename.startswith("https://"):
            f = BytesIO(urlopen(filename).read())
        elif filename.startswith("data"):
            f = filename.split('base64,')[1]
            f = base64.b64decode(f)
            f = io.BytesIO(f)
        else:
            f = open(filename, "rb")
        return f
    else:
        self.error("Unknown resource loading reason \"%s\"" % reason)

这是将图像插入pdf的示例代码.我在代码中评论了一些说明.

This is a sample code to insert images into pdf. I commented some instructions in code.

from fpdf import FPDF
import os
import io
import base64


class PDF(FPDF):

    def load_resource(self, reason, filename):
        if reason == "image":
            if filename.startswith("http://") or filename.startswith("https://"):
                f = BytesIO(urlopen(filename).read())
            elif filename.startswith("data"):
                f = filename.split('base64,')[1]
                f = base64.b64decode(f)
                f = io.BytesIO(f)
            else:
                f = open(filename, "rb")
            return f
        else:
            self.error("Unknown resource loading reason \"%s\"" % reason)


    def sample_pdf(self,img,path):

        self.image(img,h=70,w=150,x=30,y=100,type="jpg")
        #make sure you use appropriate image format here jpg/png
        pdf.output(path, 'F')

if __name__ == '__main__':
    img = # pass your base64 image
    # you can find sample base64 here : https://pastebin.com/CaZJ7n6s

    pdf = PDF()
    pdf.add_page()
    pdf_path = # give path to where you want to save pdf
    pdf.sample_pdf(img,pdf_path) 

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