PoDoFo c++ PDF library, polish characters

问题:

I have a problem with encoding polish characters in PoDoFo library.

This code generates invalid encoding of word 'Łódź'

#include <podofo/podofo.h>

using namespace PoDoFo;

int main(int argc, char *argv[], char *env[]) {
    PdfStreamedDocument document("polish.pdf");
    PdfPainter painter;
    PdfPage* pPage;


    pPage = document.CreatePage( PdfPage::CreateStandardPageSize( ePdfPageSize_A4 ) );
    painter.SetPage( pPage );
    PdfFont* pFont = document.CreateFont("Helvetica");
//  PdfFont* pFont = document.CreateFont("Helvetica", new PdfIdentityEncoding(0, 0xffff, true) );
    PdfString pString("Polish word: Łódź");
//  PdfString pString(reinterpret_cast<const pdf_utf8*>("Polish word: Łódź"));

    painter.SetFont( pFont );
    painter.DrawText( 100.0, pPage->GetPageSize().GetHeight()-100.0, pString );
    painter.FinishPage();
    document.Close();

    return 0;
}

In output pdf there is

Polish word: ņÃ3dÅo

I've tried to change encoding of source string (using commented lines in sample code), but all failed.

Can somebody explain me how to create PDF document containing non-ascii characters using PoDoFo library?

回答1:

#include <podofo/podofo.h>

using namespace PoDoFo;

int main(int argc, char *argv[], char *env[]) {
    PdfStreamedDocument document("polish.pdf");
    PdfPainter painter;
    PdfPage* pPage;


    pPage = document.CreatePage( PdfPage::CreateStandardPageSize( ePdfPageSize_A4 ) );
    painter.SetPage( pPage );
    const PdfEncoding* pEncoding = new PdfIdentityEncoding(); // required for UTF8 characters
    PdfFont *pFont = document.CreateFont("LiberationSerif", false, false, pEncoding ); // LiberationSerif has polish characters 
    PdfString pString(reinterpret_cast<const pdf_utf8*>("Polish word: Łódź")); // Need to cast input string into pdf_utf8
    painter.SetFont( pFont );
    painter.DrawText( 100.0, pPage->GetPageSize().GetHeight()-100.0, pString );
    painter.FinishPage();
    document.Close();

    return 0;
}

This code worked for me.

回答2:

Using PdfIdentityEncoding fixes display of polish characters, but using this encoding the character spacing is wrong.