Please tell me how to add text to a document page in the new versions of podofo 0.10.x?

```
...
PdfFont *font;
painter.SetCanvas(page);
font = doc.GetFonts().SearchFont("Arial");
painter.TextState.SetFont(*font, 20);
painter.DrawText("ABCDEFGHIKLMNOPQRSTVXYZ", 10, 10); //error Acrobat 
painter.FinishDrawing();
doc.Save(fn_out);
...
```
The text is not added, Acrobat throws an error on the page.
How do I add an text to an existing document?
This is a GitHub Issue
repo:podofo
owner:podofo
Title : How do I add an text to an existing document?
Issue date:

--- start body ---
Please tell me how to add text to a document page in the new versions of podofo 0.10.x?

```
...
PdfFont *font;
painter.SetCanvas(page);
font = doc.GetFonts().SearchFont("Arial");
painter.TextState.SetFont(*font, 20);
painter.DrawText("ABCDEFGHIKLMNOPQRSTVXYZ", 10, 10); //error Acrobat 
painter.FinishDrawing();
doc.Save(fn_out);
...
```
The text is not added, Acrobat throws an error on the page.
--- end body ---
