如何將圖像設置爲現有pdf文件中的pdf字段？

Question

如何將圖像設置爲現有pdf文件中的pdf字段？

我正在使用iTextSharp對象。

設置文本字段工作正常。沒問題。

pdfFormFields.SetField("Firstname", "Mujeeb"); 

請幫忙。

Answer 1

據我所知，您無法在技術上將標準PDF字段設置爲圖像（儘管您可能可以使用XFA來完成此操作）。

但是，解決方法是隻創建一個標準的iTextSharp圖像並將其縮放到表單域的尺寸並將其放置在該字段的位置。

以下是針對iTextSharp 5.1.1.0的完整工作的C＃2010 WinForms應用程序，它顯示瞭如何執行此操作。它首先創建一個非常簡單的PDF，其上有一個名爲「firstName」的單一表單字段。然後該程序的第二部分獲取該字段的位置和尺寸，並將該圖像放在適當的位置。有關更多詳細信息，請參閱代碼中的註釋。

using System; 
using System.ComponentModel; 
using System.Text; 
using System.Windows.Forms; 
using System.IO; 
using iTextSharp.text; 
using iTextSharp.text.pdf; 

namespace WindowsFormsApplication1 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      string baseFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "StartFile.pdf"); 
      string secondFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "SecondFile.pdf"); 
      string TestImage = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Test.jpg"); 

      //Create a very simple PDF with a single form field called "firstName" 
      using (FileStream fs = new FileStream(baseFile, FileMode.Create, FileAccess.Write, FileShare.None)) 
      { 
       using (Document doc = new Document(PageSize.LETTER)) 
       { 
        using (PdfWriter writer = PdfWriter.GetInstance(doc, fs)) 
        { 
         doc.Open(); 
         writer.AddAnnotation(new TextField(writer, new iTextSharp.text.Rectangle(0, 0, 100, 100), "firstName").GetTextField()); 
         doc.Close(); 
        } 
       } 
      } 


      //Create a second file "filling out" the form above 
      using (FileStream fs = new FileStream(secondFile, FileMode.Create, FileAccess.Write, FileShare.None)) 
      { 
       using (PdfStamper stamper = new PdfStamper(new PdfReader(baseFile), fs)) 
       { 
        //GetFieldPositions returns an array of field positions if you are using 5.0 or greater 
        //This line does a lot and should really be broken up for null-checking 
        iTextSharp.text.Rectangle rect = stamper.AcroFields.GetFieldPositions("firstName")[0].position; 
        //Create an image 
        iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(TestImage); 
        //Scale it 
        img.ScaleAbsolute(rect.Width, rect.Height); 
        //Position it 
        img.SetAbsolutePosition(rect.Left, rect.Bottom); 
        //Add it to page 1 of the document 
        stamper.GetOverContent(1).AddImage(img); 
        stamper.Close(); 
       } 
      } 

      this.Close(); 
     } 
    } 
} 

Answer 2

刪除文本字段並將其替換爲具有相同大小和位置的按鈕字段。如果將按鈕設置爲READ_ONLY，則無法按下它，並且它看起來像靜態圖像。這會使您試圖添加的圖像作爲字段註釋而不是將其添加到頁面內容中。

void ConvertTextFieldToImage(string inputFile, string fieldName, string imageFile, string outputFile) 
{ 
    using (PdfStamper stamper = new PdfStamper(new PdfReader(inputFile), File.Create(outputFile))) 
    { 
     AcroFields.FieldPosition fieldPosition = stamper.AcroFields.GetFieldPositions(fieldName)[0]; 

     PushbuttonField imageField = new PushbuttonField(stamper.Writer, fieldPosition.position, fieldName); 
     imageField.Layout = PushbuttonField.LAYOUT_ICON_ONLY; 
     imageField.Image = iTextSharp.text.Image.GetInstance(imageFile); 
     imageField.ScaleIcon = PushbuttonField.SCALE_ICON_ALWAYS; 
     imageField.ProportionalIcon = false; 
     imageField.Options = BaseField.READ_ONLY; 

     stamper.AcroFields.RemoveField(fieldName); 
     stamper.AddAnnotation(imageField.Field, fieldPosition.page); 

     stamper.Close(); 
    } 
} 

Answer 3

這是將圖像放置在特定位置的答案。 `

using (PdfStamper stamper = new PdfStamper(new PdfReader(fromFilePath), File.Create("toFilePath"))) 
      { 
       AcroFields.FieldPosition fieldPosition = stamper.AcroFields.GetFieldPositions("btn1")[0]; 

       PushbuttonField imageField = new PushbuttonField(stamper.Writer, fieldPosition.position, "btn1Replaced"); 
       imageField.Layout = PushbuttonField.LAYOUT_ICON_ONLY; 
       imageField.Image = iTextSharp.text.Image.GetInstance(ImageLocationPath); 
       imageField.ScaleIcon = PushbuttonField.SCALE_ICON_ALWAYS; 
       imageField.ProportionalIcon = false; 
       imageField.Options = BaseField.READ_ONLY; 

       stamper.AcroFields.RemoveField("btn1"); 
       stamper.AddAnnotation(imageField.Field, fieldPosition.page); 

       stamper.Close(); 
      }