在文本字段上添加签名 - itextsharp

Question

它不会抛出任何错误，但不会将图像放入 pdf 格式。谁能知道我在这里遗漏了什么

_pdfDocument = System.IO.Path.GetTempPath() & "TICKET_INFO.pdf"
_pdfDocumentOutput = System.IO.Path.GetTempPath() & "TICKET_INFO_OUTPUT.pdf"
SaveFromResources(_pdfDocument, My.Resources.template)

Using reader As New PdfReader(_pdfDocument)
    Using stamper As New PdfStamper(reader, New IO.FileStream(_pdfDocumentOutput, IO.FileMode.Create))

        Dim pdfForm As AcroFields = stamper.AcroFields

        Dim test As System.Drawing.Image = Image.FromFile("123.jpg")
        Dim logo As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(test, System.Drawing.Imaging.ImageFormat.Png)

        Dim fieldPosition As AcroFields.FieldPosition = stamper.AcroFields.GetFieldPositions("Description")(0)
        Dim imageField As New PushbuttonField(stamper.Writer, fieldPosition.position, "Description")
        imageField.Image = logo

        pdfForm.SetField("DateMade", "123")

        pdfForm.ReplacePushbuttonField("Description", imageField.Field)

        stamper.FormFlattening = True

    End Using
End Using

字段 DateMade 显示在输出文件中，但图像未显示。

编辑：无法从移动应用程序将标签更改为 itextsharp

根据 : Whosebug - itext

执行此操作的 "official" 方法是使用按钮字段作为图像的占位符，并像这样替换按钮的 "icon"：

编辑：字段类型为 button，名称为 button2

行更改为：

pdfForm.ReplacePushbuttonField("Button2", imageField.Field)

仍然没有显示图像。

Answer 1

上面显示的代码片段解决了我的问题。

请记住，在 pdf 表单上，您需要添加字段类型按钮才能完成此操作

Dim _pdfDocument = "template.pdf"
        Dim _pdfDocumentOutput = "template_out.pdf"

        Using reader As New PdfReader(_pdfDocument)
            Using stamper As New PdfStamper(reader, New IO.FileStream(_pdfDocumentOutput, IO.FileMode.Create))

                Dim pdfForm As AcroFields = stamper.AcroFields

                Dim Signature As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(Image.FromFile("123.jpeg"),
                                                                                      Imaging.ImageFormat.Png)

                Dim ad As PushbuttonField = stamper.AcroFields.GetNewPushbuttonFromField("Image-1")
                ad.Layout = PushbuttonField.LAYOUT_ICON_ONLY
                ad.ProportionalIcon = True
                ad.Image = Signature
                ad.BackgroundColor = iTextSharp.text.BaseColor.WHITE
                pdfForm.ReplacePushbuttonField("Image-1", ad.Field)
                pdfForm.SetField("Description-1", "DESC !")

                stamper.FormFlattening = True

            End Using
        End Using

在文本字段上添加签名 - itextsharp

Add signature on text field - itextsharp

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itext

uitextfield