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Do you mean the dictionary key DA? The DA is the default appearance string containing a sequence of valid page-content graphics or text state operators that define such properties as the field’s text size and color. You can try to parse the DA string using Pdfium. FPDFTOOLS_ParseDefaultAppearance(...). Then create the font using the PdfFont. CreateStandardFont(doc, fontName, 1), where fontName is a string representation of the standard font. The CreateStandardFont method can only parse the following font names, so I think "/ Helv 10 Tf 0 g" is either a mistakenly formed font name, or is a reference to the font in the "DR" entry or in the page’s resource dictionary. Try to explore each of them: document.Root["AcroForm"]->"DR"->"Font", page.Dictionary["Resources"]->"Font", ctrl.Dictionary["DR"], perhaps there is a key named Helv, which contains the actual font, an instance of which can be created through a call of PdfFont. CreateFont(document, fontDictionary) method. Where fontDictionary is a font dictionary contained under Helv key as direct or indirect object. The valid names for standard fonts are: Quote: {"Arial", 4},
{"Arial,Bold", 5},
{"Arial,BoldItalic", 6},
{"Arial,Italic", 7},
{"Arial-Bold", 5},
{"Arial-BoldItalic", 6},
{"Arial-BoldItalicMT", 6},
{"Arial-BoldMT", 5},
{"Arial-Italic", 7},
{"Arial-ItalicMT", 7},
{"ArialBold", 5},
{"ArialBoldItalic", 6},
{"ArialItalic", 7},
{"ArialMT", 4},
{"ArialMT,Bold", 5},
{"ArialMT,BoldItalic", 6},
{"ArialMT,Italic", 7},
{"ArialRoundedMTBold", 5},
{"Courier", 0},
{"Courier,Bold", 1},
{"Courier,BoldItalic", 2},
{"Courier,Italic", 3},
{"Courier-Bold", 1},
{"Courier-BoldOblique", 2},
{"Courier-Oblique", 3},
{"CourierBold", 1},
{"CourierBoldItalic", 2},
{"CourierItalic", 3},
{"CourierNew", 0},
{"CourierNew,Bold", 1},
{"CourierNew,BoldItalic", 2},
{"CourierNew,Italic", 3},
{"CourierNew-Bold", 1},
{"CourierNew-BoldItalic", 2},
{"CourierNew-Italic", 3},
{"CourierNewBold", 1},
{"CourierNewBoldItalic", 2},
{"CourierNewItalic", 3},
{"CourierNewPS-BoldItalicMT", 2},
{"CourierNewPS-BoldMT", 1},
{"CourierNewPS-ItalicMT", 3},
{"CourierNewPSMT", 0},
{"CourierStd", 0},
{"CourierStd-Bold", 1},
{"CourierStd-BoldOblique", 2},
{"CourierStd-Oblique", 3},
{"Helvetica", 4},
{"Helvetica,Bold", 5},
{"Helvetica,BoldItalic", 6},
{"Helvetica,Italic", 7},
{"Helvetica-Bold", 5},
{"Helvetica-BoldItalic", 6},
{"Helvetica-BoldOblique", 6},
{"Helvetica-Italic", 7},
{"Helvetica-Oblique", 7},
{"HelveticaBold", 5},
{"HelveticaBoldItalic", 6},
{"HelveticaItalic", 7},
{"Symbol", 12},
{"SymbolMT", 12},
{"Times-Bold", 9},
{"Times-BoldItalic", 10},
{"Times-Italic", 11},
{"Times-Roman", 8},
{"TimesBold", 9},
{"TimesBoldItalic", 10},
{"TimesItalic", 11},
{"TimesNewRoman", 8},
{"TimesNewRoman,Bold", 9},
{"TimesNewRoman,BoldItalic", 10},
{"TimesNewRoman,Italic", 11},
{"TimesNewRoman-Bold", 9},
{"TimesNewRoman-BoldItalic", 10},
{"TimesNewRoman-Italic", 11},
{"TimesNewRomanBold", 9},
{"TimesNewRomanBoldItalic", 10},
{"TimesNewRomanItalic", 11},
{"TimesNewRomanPS", 8},
{"TimesNewRomanPS-Bold", 9},
{"TimesNewRomanPS-BoldItalic", 10},
{"TimesNewRomanPS-BoldItalicMT", 10},
{"TimesNewRomanPS-BoldMT", 9},
{"TimesNewRomanPS-Italic", 11},
{"TimesNewRomanPS-ItalicMT", 11},
{"TimesNewRomanPSMT", 8},
{"TimesNewRomanPSMT,Bold", 9},
{"TimesNewRomanPSMT,BoldItalic", 10},
{"TimesNewRomanPSMT,Italic", 11},
{"ZapfDingbats", 13}, So the algorithm is: 1. Parse Default Appearance (DA) and get fontName (using FPDFTOOL_ParseDefaultAppearance); 2. Check if fontName is a standard name; 2.1. if so - Use CreateStandardFont; 3. find font dictionary under fontName entry in 3.1. document.Root -> AcroForm -> DR 3.2 "DR" entry in ctrl.Dictionary 3.3 page.Dictionary -> Resources -> Font (i'm not sure about 3.2 and 3.3 - perhaps this is unnecessary actions) 4. if found - create font using CreateFont 5. if not found - DA is broken; You can still use annotations instead. Perhaps your task can be solved as follows. Code:public float GetStringWidth(PdfControl ctrl, string text, PdfPage page)
{
if (ctrl == null || page == null || string.IsNullOrEmpty(text))
return 0;
string oldText = ctrl.Field.Value;
try
{
ctrl.Field.Value = text;
using (var ann = PdfAnnotation.Create(ctrl.Dictionary, page))
{
if(ann.NormalAppearance.Count>0)
return ann.NormalAppearance[0].BoundingBox.Width;
else
return 0;
}
}
finally
{
ctrl.Field.Value = oldText;
}
}
Code:using (var document = PdfDocument.Load(@"e:\9\test.pdf", new PdfForms()))
{
var ctrl = document.FormFill.InterForm.Controls[0];
var page = document.Pages[0]; //https://forum.patagames.com/posts/t559-Return-the-Page-a-Field-is-On
float width = GetStringWidth(ctrl, "t1", page);
width = GetStringWidth(ctrl, "MMM", page);
width = GetStringWidth(ctrl, "qwerty", page);
}
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