试图在c＃中将图像插入pdf [英] Trying to insert an image into a pdf in c#
问题描述
我需要根据生成的条形码文件插入图像。
I need to insert an image based on a generated barcode file.
我遇到的问题是使用iTextSharp库我通常可以填写文本，例如
The problem I'm having is when using the iTextSharp library I can normally fill in text such as
PdfReader pdfReader = new PdfReader(oldFile);
PdfStamper pdfStamper = new PdfStamper(pdfReader, outFile);
AcroFields fields = pdfStamper.AcroFields;
fields.SetField("topmostSubform[0].Page1[0].BARCODE[0]", "X974005-1");
虽然有一个字段在pdf中，如果我点击它，它会提示我插入一个图像字段，但我似乎无法以编程方式完成此操作。基于一些谷歌搜索和绊倒在stackoverflow页面，我插入以下代码，期望它按照需要工作：
though there's one field where in pdf if I click onto it it prompts me for an image to insert into field, but I can't seem to programmatically accomplish this. Based on some google searches and stumbling upon a stackoverflow page, I inserted the following code expecting it to work as desired:
string fieldName = "topmostSubform[0].Page1[0].BARCODE[0]";
string imageFile = "test-barcode.jpg";
AcroFields.FieldPosition fieldPosition = pdfStamper.AcroFields.GetFieldPositions(fieldName)[0];
PushbuttonField imageField = new PushbuttonField(pdfStamper.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;
pdfStamper.AcroFields.RemoveField(fieldName);
pdfStamper.AddAnnotation(imageField.Field, fieldPosition.page);
我遇到的问题是，当我打开新创建的时候，它会按预期删除现有字段PDF文件我没有看到这个新的按钮字段与预期的图像文件，而是作为一个空白，但当我通过调试模式执行此操作时，我可以看到它至少拾取了图像文件的正确尺寸，所以我不喜欢我不知道我在这里做错了什么。
The problem I am having is while it removes the existing field as intended, when I open the newly created PDF file I don't see this new push button field with the intended image file but rather as a blank but when I perform this through debug mode I can see that it's at least picking up the correct dimensions of the image file, so I don't know what I'm doing wrong here.
请指教，谢谢。
推荐答案
如果你看了官方文档（即：我的书），你会发现这个例子： ReplaceIcon.cs
If you read the official documentation (that is: my book), you'll find this example: ReplaceIcon.cs
您正在使用 pdfStamper.AcroFields.RemoveField（fieldName）; 删除该字段，然后尝试使用<$ c $添加新字段c> pdfStamper.AddAnnotation（imageField.Field，fieldPosition.page）;
You're removing the field using pdfStamper.AcroFields.RemoveField(fieldName); and subsequently you try adding the new field using pdfStamper.AddAnnotation(imageField.Field, fieldPosition.page);
这是错的。您应该使用 pdfStamper.AcroFields.ReplacePushbuttonField（fieldname，imageField.Field）替换字段;
That's wrong. You should replace the field using pdfStamper.AcroFields.ReplacePushbuttonField(fieldname, imageField.Field);
ReplacePushbuttonField（）方法在幕后复制大量设置。
The ReplacePushbuttonField() method copies plenty of settings behind the scenes.
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