打印问题汇总

unity/c#调用打印机进行文件打印（本文通过亲自使用的两种打印方法进行讲解），完整代码在文末

1）process类

打印文本和图片均可以采用process类调用进程进行，但是在打印图片时会弹出打印预览的框，不容易解决

2）printDocument

打印图片时不会弹框，但是在unity中需要引入相应的dll，相关dll可以去安装目录（C:\Program Files (x86)\Unity\551\Editor\Data\Mono\lib\mono\2.0）中查找，并放到plugins目录下，但是如果之前unity中存在相关dll，直接覆盖重启也存在问题，所以此时直接删除plugin下的dll，重新考入就可以。但是用printDocument打印pdf时由于文件的读取方式问题（csdn范例为通过streamreader一行一行读取），所以打印乱码，简易采用process类打印，或用其他插件。

process打印代码

   private static void PrintPdf(string file)
    {
        //string file = @"D:\document.pdf";

        ProcessStartInfo printProcessInfo = new ProcessStartInfo()
        {
            Verb = "print",
            CreateNoWindow = true,
            FileName = file,
            WindowStyle = ProcessWindowStyle.Hidden
        };

        Process printProcess = new Process();
        printProcess.StartInfo = printProcessInfo;
        printProcess.Start();
        printProcess.Dispose();
}

printdocument打印图片代码

       static void Main(string[] args)
        {

            string printFile = args[0];
            //string printerName = args[1];

            int width;
            int height;
            if (!int.TryParse(args[1], out width))
            {
                width = 355;
            }
            if (!int.TryParse(args[2], out height))
            {
                height = 500;
            }

            //Console.WriteLine("Print size:" + width + " " + height);
            PrintDocument pd = new PrintDocument();
            pd.PrintController = new StandardPrintController();


            pd.PrintPage += (o, e) =>
            {
                Image img = Image.FromFile(printFile);
                int imgWidth = (int)(img.Height * 0.7f);
                e.Graphics.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, imgWidth, img.Height), GraphicsUnit.Pixel);//通用

            };

            try
            {
                pd.Print();
                Console.WriteLine("success");
            }
            catch (Exception ex)
            {
                Console.WriteLine("failed:" + ex.Message);
            }
            //btnPrint_Click();

            Console.ReadKey();

        }

打印的相关参数可以在电脑设置-打印机-首选项中提前设置好。

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printdocument打印非pdf文档

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace PrintPdf
{

    class Program
    {
        private static StreamReader sr;
        public static bool Print(string str)
        {
            bool result = true;
            try
            {
                sr = new StreamReader(str);
                PrintDocument pd = new PrintDocument();
                pd.PrintController = new System.Drawing.Printing.StandardPrintController();
                pd.DefaultPageSettings.Margins.Top = 2;
                pd.DefaultPageSettings.Margins.Left = 0;
                pd.DefaultPageSettings.PaperSize = new PaperSize("tom", 320, 5150);
                pd.PrinterSettings.PrinterName = pd.DefaultPageSettings.PrinterSettings.PrinterName;//默认打印机
                pd.PrintPage += new PrintPageEventHandler(pd_PrintPage);
                try
                {
                    pd.Print();
                }
                catch (Exception exs)
                {
                    Console.WriteLine("打印出错:" + exs.ToString());
                    pd.PrintController.OnEndPrint(pd, new PrintEventArgs());
                }
            }
            catch (Exception ex)
            {
                result = false;
            }
            finally
            {
                if (sr != null)
                    sr.Close();
            }
            return result;
        }


        private static void pd_PrintPage(object sender, PrintPageEventArgs ev)
        {
            Font printFont = new Font("Arial", 9);//打印字体
            float linesPerPage = 0;
            float yPos = 0;
            int count = 0;
            float leftMargin = ev.MarginBounds.Left;
            float topMargin = ev.MarginBounds.Top;
            String line = "";
            linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);
            while (count < linesPerPage && ((line = sr.ReadLine()) != null))
            {
                yPos = topMargin + (count * printFont.GetHeight(ev.Graphics));
                ev.Graphics.DrawString(line, printFont, Brushes.Black,
                   leftMargin, yPos, new StringFormat());
                count++;
            }
            // If more lines exist, print another page.
            if (line != null)
                ev.HasMorePages = true;
            else
                ev.HasMorePages = false;
        }

        static void Main(string[] args)
        {
            //string file = @"D:\命令.txt";
            string file = @"D:\document.pdf";

            //Print(file);

            ProcessStartInfo printProcessInfo = new ProcessStartInfo()
            {
                Verb = "print",
                CreateNoWindow = true,
                FileName = file,
                WindowStyle = ProcessWindowStyle.Hidden
            };

            Process printProcess = new Process();
            printProcess.StartInfo = printProcessInfo;
            printProcess.Start();

            //printProcess.WaitForInputIdle();

            //Thread.Sleep(3000);

            //if (false == printProcess.CloseMainWindow())
            //{
            //    printProcess.Kill();
            //}

            Console.ReadKey();
        }
    }
}