使用占位符将预定义位置的图片添加到现有的pdf表单中。

Question

问题修订和澄清（感谢布鲁诺指向我在正确的方向） -

这篇文章最初是在严重睡眠剥夺和阅读后，我看到它可能会混淆。我想确保其他人将来可以使用这种解决方案，而不必花费大量时间来解决这个问题。

这是我的问题，下面有答案解决它。 我有一个pdf格式，我需要添加一个图像到一个特定的位置，我已经把一个占位符。我怎样才能做到这一点？

Answer 1

仅适用于未来可能正在寻找关于如何将预定义的特定位置图像添加到已有的.pdf表单中的答案的人，以下是答案。

  //This codes works for those who have a pre-created pdf form with a button in the location and size you want your image. 
        //I reccomend acrobat pro, thought it has a monthly cost. There are additional free PDF editors 
        //instantiate a new PdfStamper that will create a new file from my existing form. The Reader reads in your template and the stamper makes a copy 
    //FileToPath and FileFromPath are strings i created above that hold the path     
    using (PdfStamper stamper = new PdfStamper(new PdfReader(fileFromPath), File.Create(FileToPath"))) 
        { 
         //get my buttons positions current location and height btn1 is the name of my button that exists in the pdf already 
         AcroFields.FieldPosition fieldPosition = stamper.AcroFields.GetFieldPositions("btn1")[0]; 
         //create a new button utilze the field position to set it's location. FYI this is a rectangle. I reccomend you read about those 
         //it will save you tons of time to understand them. 
         PushbuttonField imageField = new 
//btn1Replaced is what I named the new button that will overwrite the old place holder button 
PushbuttonField(stamper.Writer, fieldPosition.position, "btn1Replaced"); 
         //Here I set they layout from my old button to my new one 
         imageField.Layout = PushbuttonField.LAYOUT_ICON_ONLY; 
         //grab the image you want in your pdf imgPath is a string I wrone above to grab the image 
         iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance("imgPath"); 
         //set your buttons image property to be your image you just grabbed 
         imageField.Image = img; 
         //always scale to the size of the button 
         imageField.ScaleIcon = PushbuttonField.SCALE_ICON_ALWAYS; 
         imageField.ProportionalIcon = false; 
         //make sure your button is read only and then it will not act like a button, it will act like an image. 
         imageField.Options = BaseField.READ_ONLY; 
         //Get rid of the old button 
         stamper.AcroFields.RemoveField("btn1"); 
         //add my button and make sure it is on the correct page 
         stamper.AddAnnotation(imageField.Field, fieldPosition.page); 

         stamper.Close();