代替:
pCont = psStamp.GetUnderContent(intCurrPage);
利用:
pCont = psStamp.GetOverContent(intCurrPage);
题
我需要通过在需要隐藏的文本上添加新图层来隐藏文本。
public void ReplacePDFText(string strSearch, StringComparison scCase, string strSource, string strDest)
{
PdfContentByte pCont = null;
if (File.Exists(strSource)) {
PdfReader pdfFileReader = new PdfReader(strSource);
using (PdfStamper psStamp = new PdfStamper(pdfFileReader, new FileStream(strDest, FileMode.Create))) {
for (int intCurrPage = 1; intCurrPage <= pdfFileReader.NumberOfPages; intCurrPage++) {
LocTextExtractionStrategy Strategy = new LocTextExtractionStrategy();
pCont = psStamp.GetUnderContent(intCurrPage);
Strategy.UndercontentCharacterSpacing = pCont.CharacterSpacing;
Strategy.UndercontentHorizontalScaling = pCont.HorizontalScaling;
string currText = PdfTextExtractor.GetTextFromPage(pdfFileReader, intCurrPage, Strategy);
List<iTextSharp.text.Rectangle> lstMatches = Strategy.GetTextLocations(strSearch, scCase);
PdfLayer pdLayer = default(PdfLayer);
pdLayer = new PdfLayer("over", psStamp.Writer);
pCont.SetColorFill(BaseColor.BLACK);
foreach (Rectangle rctRect in lstMatches) {
pCont.Rectangle(rctRect.Left, rctRect.Bottom, rctRect.Width, rctRect.Height);
pCont.Fill();
}
}
}
pdfFileReader.Close();
}
}
上面方法的问题是,该图层通过黑色成功添加。因此,我没有文字上有一条漂亮的黑线。但是,如果我设置 pCont.SetColorFill(BaseColor.BLACK)
对于白色,文字仍在显示。我该如何克服这个问题?
解决方案
代替:
pCont = psStamp.GetUnderContent(intCurrPage);
利用:
pCont = psStamp.GetOverContent(intCurrPage);