PDFSharp使用PdfTextField作为位置和大小参考,以pdf格式插入图像

时间:2012-10-29 11:17:15

标签: c# image pdf pdfsharp

我们希望将带有(绘制)签名的png图像插入带PDFSharp的PDF中。图像的位置和大小由我们之前在PDF中创建的不可见的PdfTextField确定。使用我们当前的代码,问题是:我们如何从PdfTextField(包含该字段的页面)获取页面引用?

代码:

PdfDocument document = PdfReader.Open("C:\\filex.pdf", PdfDocumentOpenMode.Modify);

// Get the root object of all interactive form fields
PdfAcroForm form = document.AcroForm;

// Get all form fields of the whole document
PdfAcroField.PdfAcroFieldCollection fields = form.Fields;

//Get the invisible PdfTextField used as position and size reference
PdfTextField signatureposition= (PdfTextField)fields["thesignature"];

PdfArray signaturerect= (PdfArray)signatureposition.Elements["/Rect"];
string x = signaturerect.Elements[0].ToString();
string y = signaturerect.Elements[1].ToString();
string w = signaturerect.Elements[2].ToString();
string h = signaturerect.Elements[3].ToString();

string imagepath= "C:\\signature.png";

//how to get the correct page reference respect the especified field?
PdfPage page= signatureposition.Owner.Pages[???];

XGraphics gfx = XGraphics.FromPdfPage(page);
XImage image = XImage.FromFile(imagepath);
gfx.DrawImage(image, x, y, width, height);

1 个答案:

答案 0 :(得分:2)

最后我们解决了它创建这个功能:

   protected int PaginaCampo(string campofirma, PdfDocument document)
{
    for (int i = 0; i < document.Pages.Count; i++)
    {
        PdfAnnotations anotations = document.Pages[i].Annotations;
        for (int j = 0; j < anotations.Count; j++)
        {
            if (anotations[j].Title != campofirma) continue;
            return i;
        }
    }
    return -1;
}

不是最好的解决方案,但它有效...如果有人添加更好的解决方案,我们会给他/她正确的答案