C# 使用iTextSharp将文本、图像、图片和条形码添加到PDF

也许我把这件事弄得更难了，但我花了很长时间把所有的东西都安排在一起，甚至出现在我的pdf上

在我的代码中，CreatePdf被称为一次性创建徽章正面，然后一次性创建徽章背面。pdf的所有对象部分都存储在数据库中，然后在此方法中循环

最初的方法只使用“graph”对象创建pdf，使用iText CreateDrawingImage生成的条形码效果非常好……除了所有的条形码都非常模糊之外。为了解决这个问题，该方法被更改为同时使用graph对象和iText图像，使用CreateImageWithBarcode

问题是，无论我如何处理iText图像，它都不会在pdf上按我希望的位置进行布局。条形码应该位于徽章的底部，但在iText图像中，条形码会移动到pdf的顶部，即图形项目的顶部

当我将所有不同的项目类型更改为全部使用iText图像时，没有任何正确的布局，甚至在pdf上也没有显示

我更愿意使用图表来展示一切，但iText CreateDrawingImage的结果无法使用。下面的switch语句中，“C128”、“Code39”和“I25”是我遇到问题的项。如果有人知道我如何绕过这些问题来设计一个干净的徽章，我将不胜感激。如果有一种干净的方法可以让CreateDrawingImage创建一个清晰的条形码，那么它将是首选

使用iTextSharp 5.5.13.1在VS 2019 C#中开发此功能

    private byte[] CreatePDF(BadgeLayoutDTO badgeLayout, Document doc, PdfContentByte cb)
    {
        if (badgeLayout == null)
            return null;

        var width = Convert.ToInt32(badgeLayout.Width);
        var height = Convert.ToInt32(badgeLayout.Height);

        var offset = -50;

        // Create the new bitmap
        using (Image image = new Bitmap(width, height))
        {
            var graph = Graphics.FromImage(image);

            // Draw a border around the badge if specified
            if (badgeLayout.Outline > 0)
            {
                var pen = new Pen(Brushes.Black, badgeLayout.Outline);
                graph.DrawRectangle(pen, 0, 0, width - 1, height - 1);
            }

            foreach (var field in badgeLayout.BdgFieldList.OrderBy(x => x.FldPosition.FldTop))
            {
                var x = Convert.ToInt32(field.FldPosition.FldLeft * RatioHorz + badgeLayout.OffsetHorz / 2);
                var y = Convert.ToInt32(field.FldPosition.FldTop * RatioVert + badgeLayout.OffsetVert / 2);
                var w = Convert.ToInt32((field.FldPosition.FldRight - field.FldPosition.FldLeft) * RatioHorz);
                var h = Convert.ToInt32((field.FldPosition.FldBottom - field.FldPosition.FldTop) * RatioVert);

                switch (field.FldType)
                {
                    case "ShadedRoundRectangle":
                    case "RoundRect":
                    {
                        const float xradius = 5;
                        const float yradius = 5;
                        var brush = new SolidBrush(AccessToHex(field.FldColor.BkColor)); // Fill Color
                        var pen = new Pen(AccessToHex(field.FldColor.ForeColor),
                            field.FldPosition.FldSize + 3); // Border color
                        var rect = new System.Drawing.Rectangle(x, y, w, h);

                        using (pen)
                        {
                            var path = MakeRoundedRect(rect, xradius, yradius, true, true, true, true);
                            graph.FillPath(brush, path);
                            graph.DrawPath(pen, path);
                        }

                        break;
                    }
                    case "ShadeRect":
                    {
                        var brush = new HatchBrush(HatchStyle.Cross, AccessToHex(field.FldColor.BkColor - 100),
                            AccessToHex(field.FldColor.BkColor));
                        var pen = new Pen(AccessToHex(field.FldColor.ForeColor),
                            field.FldPosition.FldSize + 3); // Border color
                        var rect = new System.Drawing.Rectangle(x, y, w, h);
                        graph.DrawRectangle(pen, rect);
                        graph.FillRectangle(brush, rect);

                        break;
                    }
                    case "Rectangle":
                    {
                        var brush = new SolidBrush(AccessToHex(field.FldColor.BkColor));
                        var pen = new Pen(AccessToHex(field.FldColor.ForeColor),
                            field.FldPosition.FldSize + 3); // Border color
                        var rect = new System.Drawing.Rectangle(x, y, w, h);
                        graph.DrawRectangle(pen, rect);
                        graph.FillRectangle(brush, rect);

                        break;
                    }
                    case "Ellipse":
                    {
                        var brush = new SolidBrush(AccessToHex(field.FldColor.BkColor));
                        var pen = new Pen(AccessToHex(field.FldColor.ForeColor),
                            field.FldPosition.FldSize + 3); // Border color
                        var rect = new System.Drawing.Rectangle(x, y, w, h);
                        graph.DrawEllipse(pen, rect);
                        graph.FillEllipse(brush, rect);

                        break;
                    }
                    case "ShadedEllipse":
                    {
                        var brush = new HatchBrush(HatchStyle.Cross, AccessToHex(field.FldColor.BkColor - 100),
                            AccessToHex(field.FldColor.BkColor));
                        var pen = new Pen(AccessToHex(field.FldColor.ForeColor),
                            field.FldPosition.FldSize + 3); // Border color
                        var rect = new System.Drawing.Rectangle(x, y, w, h);
                        graph.DrawEllipse(pen, rect);
                        graph.FillEllipse(brush, rect);

                        break;
                    }
                    case "Image":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                            var dbimage = _filePicture.Get(field.FldData.FldDataValue.ToString(), 36);

                            //var imageJ = iTextSharp.text.Image.GetInstance(dbimage.FileImage);
                            //imageJ.SetAbsolutePosition(x, y + offset);

                            //var rect = new Rectangle(0, 0, w, h);
                            //imageJ.ScaleToFit(rect);

                            //doc.Add(imageJ);

                            using (var ms = new MemoryStream(dbimage.FileImage))
                            {
                                var newImage = Image.FromStream(ms);

                                // Resize image to proper aspect ratio
                                var aspect = ResizeKeepAspect(newImage.Size, w, h);
                                var aspectImage = ResizeImage(newImage, new Size(aspect.Width, aspect.Height));

                                // Create Point for upper-left corner of image.
                                var ulCorner = new Point(x, y);

                                // Draw image to screen.
                                graph.DrawImage(aspectImage, ulCorner);
                            }

                            break;
                    }
                    case "QRCode":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        QRCodeGenerator qrGenerator = new QRCodeGenerator();
                        QRCodeData qrCodeData = qrGenerator.CreateQrCode(field.FldData?.FldDataValue.ToString(), QRCodeGenerator.ECCLevel.Q);
                        QRCode qrCode = new QRCode(qrCodeData);
                        Bitmap dbImage = qrCode.GetGraphic(20);
                        var aspect = ResizeKeepAspect(dbImage.Size, w, h);
                        var aspectImage = ResizeBadgeImage(dbImage, new Size(aspect.Width, aspect.Height));
                        using (var ms2 = new MemoryStream())
                        {
                            try
                            {
                                aspectImage.Save(ms2, System.Drawing.Imaging.ImageFormat.Jpeg);
                                var signatureImage = iTextSharp.text.Image.GetInstance(ms2.ToArray());
                                signatureImage.SetAbsolutePosition(x, y + offset - 100);
                                doc.Add(signatureImage);
                            }
                            catch (Exception e)
                            {
                                Console.WriteLine(e);
                            }
                        }
                        break;
                    }
                    case "C128":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var dbImage = (new Barcode128()
                        {
                            Code = field.FldData?.FldDataValue.ToString()
                        });

                        iTextSharp.text.Image image128 = dbImage.CreateImageWithBarcode(cb, null, BaseColor.WHITE);
                        image128.SetAbsolutePosition(x, y + offset);
                        var rect = new Rectangle(0, 0, w, h);
                        image128.ScaleToFit(rect);
                        doc.Add(image128);
                        break;
                    }
                    case "Code39":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var dbImage = (new Barcode39
                        {
                            Code = field.FldData?.FldDataValue.ToString()
                        });

                        iTextSharp.text.Image image128 = dbImage.CreateImageWithBarcode(cb, null, BaseColor.WHITE);
                        image128.SetAbsolutePosition(x, y + offset);
                        var rect = new Rectangle(0, 0, w, h);
                        image128.ScaleToFit(rect);

                        doc.Add(image128);
                        break;
                    }
                    case "I25":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var dbImage = (new BarcodeInter25()
                        {
                            Code = field.FldData?.FldDataValue.ToString()
                        });

                        iTextSharp.text.Image image128 = dbImage.CreateImageWithBarcode(cb, null, BaseColor.WHITE);
                        image128.SetAbsolutePosition(x, y + offset);

                        var rect = new Rectangle(0, 0, w, h);
                        image128.ScaleToFit(rect);

                        doc.Add(image128);
                        break;
                    }
                    case "Picture":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var dbimage = _filePicture.Get(field.FldData.FldDataValue.ToString(), 48);

                        //var imageJ = iTextSharp.text.Image.GetInstance(dbimage.FileImage);
                        //imageJ.SetAbsolutePosition(x, y + offset);

                        //var rect = new Rectangle(0, 0, w, h);
                        //imageJ.ScaleToFit(rect);

                        //doc.Add(imageJ);
                        using (var ms = new MemoryStream(dbimage.FileImage))
                        {
                            var newImage = Image.FromStream(ms);

                            // Resize image to proper aspect ratio
                            var aspect = ResizeKeepAspect(newImage.Size, w, h);
                            var aspectImage = ResizeImage(newImage, new Size(aspect.Width, aspect.Height));

                            //var rect = new Rectangle(0, 0, w, h);

                            // Create Point for upper-left corner of image.
                            var ulCorner = new Point(x, y);

                            // Draw image to screen.
                            graph.DrawImage(aspectImage, ulCorner);
                        }

                        break;
                    }
                    case "Signature":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var dbimage = _filePicture.Get(field.FldData.FldDataValue.ToString(), 36);

                        if (dbimage == null) continue;

                            //iTextSharp.text.Image imageJ = new Jpeg(dbimage.FileImage);
                            //imageJ.SetAbsolutePosition(x, y + offset);

                            //var rect = new Rectangle(0, 0, w, h);
                            //imageJ.ScaleToFit(rect);

                            //doc.Add(imageJ);

                        using (var ms = new MemoryStream(dbimage.FileImage))
                        {
                            var newImage = Image.FromStream(ms);

                            // Resize image to proper aspect ratio
                            var aspect = ResizeKeepAspect(newImage.Size, w, h);
                            var aspectImage = ResizeImage(newImage, new Size(aspect.Width, aspect.Height));

                            // Create Point for upper-left corner of image.
                            var ulCorner = new Point(x, y);

                            // Draw image to screen.
                            graph.DrawImage(aspectImage, ulCorner);
                        }

                        break;
                    }
                    case "TextCenter":
                    case "TextLeft":
                    case "TextRight":
                    {
                            var text = GetText(field);

                            // Assume here that screen DPI is 96...
                            // If DPI is different, rendering issues might occur...
                            // Badge designer in Desktop assumes 300 DPI
                            var fontSizeDpiRatioFix = 300 / 96; //HACK
                            var fontSize = -field.FldPosition.FldSize * fontSizeDpiRatioFix * 1.03;
                            Font font;
                            try
                            {
                                font = FindFont(graph, text, new Size(w, h),
                                    new Font(new FontFamily(field.FldFont.FontName), (float)fontSize,
                                        GetFontParam(field.FldFont.FontParms)));
                            }
                            catch (Exception exc)
                            {
                                font = System.Drawing.SystemFonts.DefaultFont;
                            }

                            //Create rectangles
                            var rect1 = new System.Drawing.Rectangle(x, y, w, h);

                            //Construct string format and alignment
                            var strFormat1 = new StringFormat
                            {
                                Alignment = StringAlignment.Center,
                                LineAlignment = StringAlignment.Center,
                                Trimming = StringTrimming.EllipsisCharacter
                            };

                            // Draw GDI+ objects
                            graph.DrawRectangle(new Pen(Color.Transparent), rect1);
                            graph.DrawString(text, font,
                                new SolidBrush(AccessToHex(field.FldColor.ForeColor)), rect1, strFormat1);

                            //Disposes of objects
                            font.Dispose();

                            break;
                        }
                }
            }

            using (var ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Png);
                return ms.ToArray();
            }
        }

---

我没有继续使用iTextSharp条形码，而是从Nugget安装了IronBarcode，并且很快就能用几行代码获得清晰、干净的条形码。生成的条形码能够导出为位图，允许我使用pdf其余部分正在使用的图形布局。问题解决了

解决方案片段：

                    case "C128":
                    {
                        if (field.FldData?.FldDataValue == null)
                            continue;

                        var myBarCode = BarcodeWriter.CreateBarcode(field.FldData?.FldDataValue.ToString(), BarcodeEncoding.Code128)
                            .ResizeTo(w,h).ToBitmap();

                        // Create Point for upper-left corner of image.
                        var ulCorner = new Point(x, y);

                        // Draw image to screen.
                        graph.DrawImage(myBarCode, ulCorner);
                        break;
                    }

---

为什么不在文章中添加一些换行符以使其可读？您是否考虑过位图图像和pdf页面中的坐标系可能会有很大差异？位图图像API通常将原点（0,0）定位在左上角，并向下增加y坐标。另一方面，PDF的原点可以位于任何位置（通常位于左下角），并且y坐标向上递增。位图图像API通常按对象的左上角定位对象，PDF按对象的左下角定位对象。此外，您必须考虑在稍后将位图添加到PDF中时所使用的转换。因此，您必须在从添加到位图切换到添加PDF的过程中对坐标进行相当大的转换。