c# - ITextSharp/Pdftk: place Base64 Image from Web on PDF as Pseude-Signature -


i trying conceptualize way base64 image onto rendered pdf in itext. goal have pdf save disk reopen apply "signature" in right spot.

i haven't had success finding other examples online i'm asking stack.

my app uses .net c#.

any advice on how started?

as @mkl mentioned question confusing, title - base64 , signature not go together. guessing want place base64 image web on pdf pseudo signature?!?!

a quick working example started:

static void main(string[] args) {     string currentdir = appdomain.currentdomain.basedirectory;     // 'input' => rendered pdf in itext     pdfreader reader = new pdfreader(input);     string outputfile = path.combine(currentdir, output);     using (var stream = new filestream(outputfile, filemode.create))      {         using (pdfstamper stamper = new pdfstamper(reader, stream))         {             acrofields form = stamper.acrofields;             var fldposition = form.getfieldpositions("lname")[0];             rectangle rectangle = fldposition.position;             string base64image = "data:image/png;base64,ivborw0kggoaaaansuheugaaaauaaaafcayaaacnbyblaaaaheleqvqi12p4//8/w38giaxdibke0dhxgljnbaao9txl0y4ohwaaaabjru5erkjggg==";             regex regex = new regex(@"^data:image/(?<mediatype>[^;]+);base64,(?<data>.*)");             match match = regex.match(base64image);             image image = image.getinstance(                 convert.frombase64string(match.groups["data"].value)             );             // best fit if image bigger form field             if (image.height > rectangle.height || image.width > rectangle.width)             {                 image.scaleabsolute(rectangle);             }             // form field top left - change parameters needed set different position              image.setabsoluteposition(rectangle.left + 2, rectangle.top - 2);             stamper.getovercontent(fldposition.page).addimage(image);         }     } }

if you're not working pdf form template, (acrofields in code snippet) explicitly set absolute position , scale image needed.


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