B4J Question Reading PDF fields with B4J

[Radisk3]

Dear all

From the little I know about Python, I can create a code, using the "fitz", "os" and "re" libraries to open PDF and find data within it, split PDF, save files.

Something simple but effective where I can find fields and extract data.

Example of a Python function that searches for data from PDF:

I commented the lines to make it easier to understand.

def extrair_nome(texto):
    #"""Busca o nome da pessoa no texto da página"""
    linhas = texto.split("\n")  # Quebra o texto por linhas
    for i, linha in enumerate(linhas):
        if "Nome Completo" in linha:  # Encontrou o campo "Nome Completo"
            if i + 1 < len(linhas):  # Verifica se há uma linha abaixo
                cpf = linhas[i + 1].strip()  # Captura o nome abaixo
                nome = linhas[i + 2].strip()  # Captura o nome abaixo
                nome = re.sub(r'[<>:"/\\|?*]', '_', cpf + '_' + nome)  # Remove caracteres inválidos no nome do arquivo
                return nome
    return None  # Retorna None se não encontrar o nome

Can I do something similar in B4J?
If so, where do I start?

 

[DonManfred]

A PDF is a binaryformat.
You can iterate over the "lines" in this file and get back formfields??

If that works with Python it should also work with B4X

 

[Erel]

Extract text with pdfplumber: https://github.com/jsvine/pdfplumber

1. Create a new PyBridge project.
2. Click on the "create a local Python runtime" link.
3. Click on "Open local Python shell"
4. Run: pip install pdfplumber
5.

Private Sub GetPageText (pdf As PyWrapper, PageNumber As Int) As ResumableSub
    Wait For (pdf.GetField("pages").Get(PageNumber).Run("extract_text").Fetch) Complete (Result As PyWrapper)
    Return Result.Value
End Sub

Private Sub OpenPdf (FileName As String) As PyWrapper
    Dim pdf As PyWrapper = PDFPlumber.Run("open").Arg(FileName)
    Return pdf
End Sub

Usage:

PDFPlumber = Py.ImportModule("pdfplumber") 'global PyWrapper variable
    Dim pdf As PyWrapper = OpenPdf("C:\Users\H\Downloads\aaaa.pdf")
    Wait For (pdf.GetField("pages").Len.Fetch) Complete (Result As PyWrapper)
    Dim NumberOfPages As Int = Result.Value
    Log($"Opened pdf with ${NumberOfPages} pages"$)
    Wait For (GetPageText(pdf, 0))  Complete(Text As String) 'get first page text
    Log(Text)
'close when done
    pdf.Run("close")

 

[Erel]

And if you want to be able to read also files from the assets folder, then you need to read the bytes and send them to the Python process:

Private Sub OpenPdf (Dir As String, FileName As String) As PyWrapper
    Dim stream As PyWrapper = Py.ImportModule("io").Run("BytesIO").Arg(File.ReadBytes(Dir, FileName))
    Dim pdf As PyWrapper = PDFPlumber.Run("open").Arg(stream)
    pdf.Print
    Return pdf
End Sub

 

[DonManfred]

Extract text with pdfplumber

Thank you for the example. I fear the TO does not need the PDF-Content as text.

Instead he want to know the fieldnames of containing Acroform-PDF-Fields.. At least this is how i interpret the question in subject.

 

[Erel]

The library can extract all information. If the OP provides a concrete example then I can try to help with reading the fields.