/// <summary>
/// 插入文字浮水印
/// </summary>
/// <param name="getPDFContent">PDF內容</param>
/// <param name="textWaterMark">文字浮水印內容</param>
/// <returns></returns>
public byte[] InsertWaterMark(
byte[] getPDFContent,
string textWaterMark
)
{
MemoryStream msInput = new MemoryStream();
byte[] result = new byte[] { };
using (PdfReader pdfReader = new PdfReader(getPDFContent))
{
using (PdfStamper pdfStamper = new PdfStamper(pdfReader, msInput))
{
int pageTotal = pdfReader.NumberOfPages + 1;
PdfContentByte content;
PdfGState gs = new PdfGState();
var unicodefy = new UnicodeFontFactory();
// 第一頁索引起始是1
for (int i = 1; i < pageTotal; i++)
{
// 取得當前頁面Size
Rectangle psize = pdfReader.GetPageSize(1);
// 取得Page 寬與高
float width = psize.Width;
float height = psize.Height;
content = pdfStamper.GetUnderContent(i); //在内容上方加水印
// 設置透明度
gs.FillOpacity = 0.3f;
content.SetGState(gs);
//寫入內容
content.BeginText();
content.SetColorFill(BaseColor.BLACK);
content.SetFontAndSize(unicodefy.KAIUFont, 30);
content.SetTextMatrix(0, 0);
content.ShowTextAligned(
Element.ALIGN_CENTER, // 對齊
textWaterMark, // 內容
width / 2, // X軸
height - 200, // Y軸
5.56f // 旋轉幅度
);
content.EndText();
}
}
msInput.Close();
result = msInput.ToArray();
}
return(result);
}
/// <summary>
/// 執行將Html字串內容轉換成PDF
/// </summary>
/// <param name="htmlTextContent">Html 內容字串</param>
/// <returns>返回經過轉換後PDF流內容(Byte[])</returns>
public byte[] RunHtmlTextContentToPDF(
string htmlTextContent
)
{
// 如果未有內容就返回Null
if (string.IsNullOrEmpty(htmlTextContent))
{
return(null);
}
string tempHtmlText = htmlTextContent;
#region 字體檢查
var unicodefy = new UnicodeFontFactory();
foreach (var ch in tempHtmlText.Distinct())
{
// 檢查字元是否不可被字體識別
if (!unicodefy.KAIUFont.CharExists(ch))
{
// 幫字體加上html字型替換為思源黑體
tempHtmlText = tempHtmlText.Replace(ch.ToString(), "<span style='font-family: NotoSerif'>" + ch + "</span>");
}
}
#endregion 字體檢查
// 建立一個空白記憶體Stream
MemoryStream outputStream = new MemoryStream();
// 將Html字串內容轉換成Byte陣列
byte[] data = Encoding.UTF8.GetBytes(tempHtmlText);
//要寫PDF的文件，建構子沒填參數的話預設直式A4
Document doc = new Document();
// PDF Writer Factory
using (
PdfWriter writer = PdfWriter.GetInstance(
doc, // 空白文件
outputStream // 文件暫存區塊
)
)
{
//指定文件預設開檔時的縮放為100%
PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
// 文件開檔
doc.Open();
// 將轉換成Byte陣列Html字串內容放在記憶體Stream
MemoryStream msInput = new MemoryStream(data);
//使用XMLWorkerHelper把Html內容Parse成PDF內容
XMLWorkerHelper.GetInstance().ParseXHtml(
writer, // PDF Writer
doc, // 空白文件
msInput, // Html內容
null,
Encoding.UTF8, // 文件編碼
fontFactory // 字體提供者
);
//將pdfDest設定的資料寫到PDF內容
PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
writer.SetOpenAction(action);
// 文件關檔
doc.Close();
msInput.Close();
}
outputStream.Close();
return(outputStream.ToArray());
}
/// <summary>
/// Constructor
/// </summary>
public PDFProcess()
{
fontFactory = new UnicodeFontFactory();
}
