try { var mergeFilePath = string.Format("{0}mergepdf.pdf", tempDownDir); PDFPrintHelper.MergePDFFile(pdfList, mergeFi

winform 按顺序连续打印多个PDF文件

 

关于PDF打印的问题，前面有篇文章（点这里查看）也叙述过，今天来谈谈另外一种方法

其实方法很简单，因为需要把多个PDF文档按顺序连续打印，为此我们为什么不把要打印的pdf文档按顺序合并成一个PDF打印呢？如此就简单多了哦。

这里文章写出来并不是为了炫耀什么，只是觉得发现些好东西就分享出来而已，同时也做个记录，方便以后查找

开始正文

1、为了方便，打印方法就不另寻他路了，和前面一致，具体如下：

 
Process proc = new Process();
proc.StartInfo.CreateNoWindow = false;
proc.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
proc.StartInfo.UseShellExecute = true;
proc.StartInfo.FileName = itemPath;//打印文件路径（本地完整路径包括文件名和后缀名）
proc.StartInfo.Verb = "print";
proc.Start();
proc.Close();

2、就是重点了，合并PDF文档，方法很简单，网上一搜一大把，因为我的需求需要把jpg图片和pdf一起打印，因此合并方法中包含图片

使用此方法需要第三方控件iTextSharp.dll(点击这里下载)

 
/// <summary>
        /// 把多个PDF文件和JPG/PNG图合并成一个PDF文档
        /// </summary>
        /// <param name="fileList">需要合并文件的完整路径列表</param>
        /// <param name="outMergeFile">输出文件完整路径</param>
        public static void MergePDFFile(List<string> fileList, string outMergeFile)
        {
            PdfReader reader;
            Document document = new Document();
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(outMergeFile, FileMode.Create));
            document.Open();
            PdfContentByte cb = writer.DirectContent;
            PdfImportedPage newPage;
            foreach (var itemFile in fileList)
            {
                if (!File.Exists(itemFile))
                {
                    string fileName = Path.GetFileName(itemFile);
                    LogMessageWrite.WriteMessage(string.Format("文件打印合并__{0} 文件不存在", fileName));
                    continue;
                }
                FileInfo fInfo = new FileInfo(itemFile);
                if (fInfo.Length < 1)
                {
                    string fileName = Path.GetFileName(itemFile);
                    LogMessageWrite.WriteMessage(string.Format("文件打印合并__文件内容为空，无法打印，{0}", fileName));
                    return;
                }

                var ext = Path.GetExtension(itemFile).ToLower();
                if (".pdf".Equals(ext))
                {
                    reader = new PdfReader(itemFile);
                    int iPageNum = reader.NumberOfPages;
                    for (int j = 1; j <= iPageNum; j++)
                    {
                        document.NewPage();
                        newPage = writer.GetImportedPage(reader, j);
                        cb.AddTemplate(newPage, 0, 0);
                    }
                }
                else if (".jpg".Equals(ext) || ".jpge".Equals(ext) || ".png".Equals(ext))
                {
                    FileStream rf = new FileStream(itemFile, FileMode.Open, FileAccess.Read);
                    int size = (int)rf.Length;
                    byte[] imext = new byte[size];
                    rf.Read(imext, 0, size);
                    rf.Close();
                    Image img = Image.GetInstance(imext);
                    //调整图片大小，使之适合A4
                    var imgHeight = img.Height;
                    var imgWidth = img.Width;
                    if (img.Height > iTextSharp.text.PageSize.A4.Height)
                    {
                        imgHeight = iTextSharp.text.PageSize.A4.Height;
                    }
                    if (img.Width > iTextSharp.text.PageSize.A4.Width)
                    {
                        imgWidth = iTextSharp.text.PageSize.A4.Width;
                    }
                    img.ScaleToFit(imgWidth, imgHeight);
                    //调整图片位置，使之居中
                    img.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;
                    document.NewPage();
                    document.Add(img);
                }
            }
            document.Close();
        }

3、打印合并后的文件

 
try
            {
    var mergeFilePath = string.Format("{0}mergepdf.pdf", tempDownDir);
                PDFPrintHelper.MergePDFFile(pdfList, mergeFilePath);
                Process proc = new Process();
                proc.StartInfo.CreateNoWindow = false;
                proc.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                proc.StartInfo.UseShellExecute = true;
                proc.StartInfo.FileName = mergeFilePath;//打印文件路径（本地完整路径包括文件名和后缀名）
                proc.StartInfo.Verb = "print";
                proc.Start();
                proc.Close();
            }
            catch (Exception ex)
            {
                LogMessageWrite.WriteMessage(ex.Message);
            }

至此 大功告成

一、CSS兼容代码

1 2 3 4 5 6

.transparent {     filter:alpha(opacity=50);  /* IE */    -moz-opacity:0.5;          /* FireFox old version*/    -khtml-opacity: 0.5;       /* Sarfari old version */    opacity: 0.5;              /* FireFox */ }

二、Javascript兼容代码

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

if (!window.jasen.core.Util) {      window.jasen.core.Util = {};  }    var $ = function (id) {      return document.getElementById(id);  }    function style(element, key, value) {      if (typeof element == "string") {          element = $(element);      }        if (value) {          element.style[key] = value;      }      else {          return element.style[key];      }  };    function opacity(element, /*0-100*/opacityValue) {      var opacityValue = parseInt(opacityValue);      style(element, "filter", "alpha(opacity=" + opacityValue + ")");        opacityValue /= 100.0;      style(element, "MozOpacity", opacityValue);      style(element, "KhtmlOpacity", opacityValue);      style(element, "opacity", opacityValue);  };    var Util = window.Util = window.jasen.core.Util;  Util.opacity = opacity;  Util.style = style;

三、范例

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
      #content
      {
          width:300px;
          margin:20px auto;
      }
    </style>
    <script src="Scripts/jasen.Core.Util.js" type="text/javascript"></script>
    <script type="text/javascript">
        window.onload = function () {
            var seletor = document.getElementById("opacitySeletor");
            seletor.options.add(new Option("--请选择--", "100"));

            for (var i = 0; i <= 100; i++) {
                seletor.options.add(new Option(i, i));
            }

            seletor.onmousewheel = function (event) {
                event = event || window.event;
                var currentIndex = seletor.selectedIndex - event.wheelDelta / 120;

                if (currentIndex < 0) {
                    seletor.selectedIndex = seletor.options.length - 1;
                }
                else if (currentIndex > seletor.options.length - 1) {
                    seletor.selectedIndex = 0;
                }
                else {
                    seletor.selectedIndex = currentIndex;
                }

                seletor.onchange();
                return false;
            }
        }

        function changeOpacity() {
            var element = document.getElementById("opacitySeletor");

            if (element.selectedIndex < 0) {
                return;
            }

            var opacityValue = element[element.selectedIndex].value;

            if (opacityValue != "") {
                Util.opacity("opacityImg", opacityValue);
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       <div id="content">
         <select id="opacitySeletor" onchange="return changeOpacity();"></select>
         <img id = "opacityImg" src="Images/car.jpg" title="car opacity" alt="car opacity" />
      </div>
    </div>
    </form>
</body>
</html>