好久没写博客了,今天给大家分享一个图片转PDF的相关操作,也算是一次总结吧。
首先需要准备动态库itextsharp.dll,这个dll去网上下载,都可以下载到,C#对PDF的操作都是基于这个类库来实现的。话不多说,直接上代码。
/// <summary> /// 导出PDF /// </summary> /// <param name="FilePath">图片的路劲</param> /// <param name="FileName">图片的名称</param> private bool PrintToPdf(string FilePath,string FileName ) { iTextSharp.text.Rectangle rec = new iTextSharp.text.Rectangle(0, 0, iTextSharp.text.PageSize.A4.Width, iTextSharp.text.PageSize.A4.Height); iTextSharp.text.Image image; iTextSharp.text.Document document = null; FileStream fs = null; PdfWriter writer = null; try { //生成PDF document = new iTextSharp.text.Document(rec); fs = new FileStream(FilePath + FileName + ".pdf", FileMode.Create); PdfWriter.GetInstance(document, fs); document.Open(); image = iTextSharp.text.Image.GetInstance(FilePath + FileName + ".jpg"); //调整图片大小,使之适合A4 if (image.Height > rec.Height) { image.ScaleToFit(rec.Width, rec.Height); } else if (image.Width > rec.Width) { image.ScaleToFit(rec.Width, rec.Height); } //调整图片位置,使之居中 image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE; document.NewPage(); document.Add(image); } catch (Exception ex) { return false; } finally { if (document.IsOpen()) { document.Close(); } fs.Close(); //最后删除生成的图片 File.Delete(FilePath + FileName + ".jpg"); } try { //添加水印图片,水印图片采取的是先生成图片,再添加到PDF文件中 document = new iTextSharp.text.Document(rec); fs = new FileStream(FilePath + FileName + ".pdf", FileMode.Open); writer = PdfWriter.GetInstance(document, fs); iTextSharp.text.Image imgWater = CreateWaterImage(); PdfReader reader = new PdfReader(fs); document.Open(); PdfContentByte cb = writer.DirectContent; PdfImportedPage newPage; int iPageNum = reader.NumberOfPages; for (int j = 1; j <= iPageNum; j++) { document.NewPage(); newPage = writer.GetImportedPage(reader, j); //pdf旋转 if (newPage.Width > newPage.Height) { cb.AddTemplate(newPage, 0, -1f, 1f, 0, 0, newPage.Width); } else { cb.AddTemplate(newPage, 0, 0); } cb.AddImage(imgWater); } return true; } catch (Exception ex) { return false; } finally { if (document.IsOpen()) { document.Close(); } writer.Close(); fs.Close(); } } /// <summary> /// 生成水印图片 /// </summary> /// <returns></returns> private iTextSharp.text.Image CreateWaterImage() { string WaterText = "水印文本"; Bitmap bitmap = new Bitmap(595, 842); using (Graphics g = Graphics.FromImage(bitmap)) { //重置图像 g.ResetTransform(); //设置旋转中心 g.TranslateTransform(bitmap.Width / 2, bitmap.Height / 2); //旋转50度 顺时针 g.RotateTransform(-50); //指定文本呈现的质量 解决文字锯齿问题 g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; System.Drawing.Font font = new System.Drawing.Font("微软雅黑", 14); SolidBrush solidBrush = new SolidBrush(Color.FromArgb(100, 0, 0, 0)); //设置文字、字体、大小、颜色、起始位置 g.DrawString(WaterText, font, solidBrush, new Point(-240, -100)); g.DrawString(WaterText, font, solidBrush, new Point(-340, 100)); } //把水印图片保存在系统指定位置 bitmap.Save("C:\\WaterTemp.jpg"); iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance("C:\\WaterTemp.jpg"); //透明度,灰色填充 image.GrayFill = 20; image.SetAbsolutePosition(0, 0); return image; }
06-22 00:00