PyPDF2 decoding issue when adding annotations in Chinese characters with addJS-CodePudding

I want to use PyPDF2 to add annotations programmatically with the use of addJS, it works very well for Latins characters but not for Chinese character, tried to encode with UTF-8 but seems not work either. Here are the code:

from PyPDF2 import PdfFileWriter, PdfFileReader
Def Test():
    inputPDF = PdfFileReader('./demo/TESTPDFANNOTATION.pdf', "rb")    
    outputPDF = PdfFileWriter()
       
    pages = inputPDF.getNumPages()
    for p in range(pages):
        outputPDF.addPage(inputPDF.getPage(p))

    outputStream = open('./demo/TESTPDFANNOTATIONOUT.pdf', "wb")
    outputPDF.addJS("var annot = this.addAnnot({ \r \
                    page: 0, \r \
                    type: 'FreeText', \r \
                    contents: '你好', \r \
                    textFont: 'csongl', \r \
                    textSize: 10, \r \
                    rect: [200, 300, 200 150, 300 3*12], // height for three lines \r \
                    width: 1, \r \
                    alignment: 1 \r \
                    });")
    outputPDF.write(outputStream)    
    outputStream.close()
    return("ok")

It's weird that If I opened the PDF in notepad text editor, the Chinese characters displayed correctly however when opened with PDF, it shows something like ä½€å¥½, which seems not decoded, since they could be decoded with the online convert tool into almost the right Chinese character, not exactly the same for some cases. https://cafewebmaster.com/online_tools/utf_decode

Any advise would be highly appreciated!

Python version: 3.9 OS: Win10

Thanks Stanley

CodePudding user response：

Finally, figured out to use another package PyMuPDF to add annotations programmatically with good support of Chinese characters.

import fitz

def writeAnnotation():
    blue  = (0,0,1)
    gold  = (1,1,0)

    pdfDoc = fitz.open('./demo/TESTPDFANNOTATION.pdf')
    page = pdfDoc[0]

    rect1 = fitz.Rect(100,100,200,150)

    strContent1= "你好！世界"

    a1 = page.addFreetextAnnot(rect1, strContent1, text_color=blue,  fill_color=gold)

    pdfDoc.save("./demo/TESTPDFANNOTATIONOUT.pdf")
    return("Well done!")