为什么printdocument的此代码无法正确打印? [英] Why does this code for printdocument not print correctly?

问题描述

嗨.我是C#的新手，毫无疑问我做错了事.

Hi.  I'm pretty new to C# and no doubt I'm doing something wrong.

我有一个只有一行文本的文本文件.没有特殊字符，什么都没有.

I have a textfile that has a single line of text.  No special characters, nothing.

我安装了多台打印机.我想将文本文件打印到不是默认打印机的打印机，而不显示PrinterDialog.打印机的选择似乎可行，但是页面上出现了垃圾.垃圾，我的意思是 彼此印刷的字母，有点像是双重印刷.也可以是控制字符，但绝对是文本文件中的单行.我尝试调试，并且知道流文件​​确实在正确读取行，所以 这只是打印机的输出.我注意到事件中的ev.graphics.drawstring重载，并且StringFormat似乎是可选的，因此我尝试在有和没有最后一个参数"new stringformat()"的情况下运行它.我没什么区别.

I have multiple printers installed.  I want to print the textfile to a printer that is not the default printer, without showing a PrinterDialog.  The printer choice seems to be working, but I get garbage on the page.  By garbage, I mean letters that are printing on each other, sort of a double printing.  It could be control characters, too, but it's definitly the single line within the text file.  I tried debugging and know the streamfile is indeed reading the line correctly, so it's just the printer output.  I noticed the the ev.graphics.drawstring within the event is overloaded and the StringFormat seemed optional, so I've tried running it both with and without the last parameter of "new stringformat()".  I saw no difference.

我的代码非常简单，并取自Microsoft的示例.首先，我创建一个新的printdocument实例.然后，我将文档分配给自己选择的打印机.最后，我为printpage事件分配一个事件处理程序. 我直接从代码示例中复制了事件处理程序.知道为什么文本没有打印出我期望的样子吗?

My code is pretty simple and was taken from a Microsoft example.  First I create a new instance of a printdocument.  Then I assign the document to the printer of my choice.  Finally, I assign an event handler for the printpage event.  I copied the event handler straight from the code example.  Any idea why the text isn't printing what I expected?

谢谢！

黛比·埃里克森

        // The Click event is raised when the user clicks the Print button.
        private void printButton_Click(object sender, EventArgs e)
        {
            try
            {
                streamToPrint = new StreamReader
                   ("C:\\My Documents\\MyFile.txt");
                try
                {
                    printFont = new Font("Arial", 10);
                    PrintDocument pd = new PrintDocument();
                    pd.PrinterSettings.PrinterName = "Sharp AR-M550N PCL5e";
                    pd.PrintPage += new PrintPageEventHandler
                       (this.pd_PrintPage);
                    pd.Print();
                }
                finally
                {
                    streamToPrint.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        // The PrintPage event is raised for each page to be printed.
        private void pd_PrintPage(object sender, PrintPageEventArgs ev)
        {
            float linesPerPage = 0;
            float yPos = 0;
            int count = 0;
            float leftMargin = ev.MarginBounds.Left;
            float topMargin = ev.MarginBounds.Top;
            string line = null;
            // Calculate the number of lines per page.
            linesPerPage = ev.MarginBounds.Height /
               printFont.GetHeight(ev.Graphics);
            // Print each line of the file.
            while (count < linesPerPage &&
               ((line = streamToPrint.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;
        }

推荐答案

尝试一下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Drawing.Printing;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private StreamReader fileToPrint;
        private Font printFont;
        private PrintDocument printDocument1 = new PrintDocument();

        public Form1()
        {
            InitializeComponent();
            printDocument1.PrintPage += new PrintPageEventHandler(pd_PrintPage);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //String printPath = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            fileToPrint = new StreamReader(@"C:\Users\jgrove\Documents\Text\SetDIstinctTraces.txt");
            printFont = new System.Drawing.Font("Arial", 10);
            printDocument1.Print();
            fileToPrint.Close();
           
        }

        private void pd_PrintPage(object sender, PrintPageEventArgs e)
        {
            float yPos = 0f;
            int count = 0;
            float leftMargin = e.MarginBounds.Left;
            float topMargin = e.MarginBounds.Top;
            string line = null;
            float linesPerPage = e.MarginBounds.Height / printFont.GetHeight(e.Graphics);
            while (count < linesPerPage)
            {
                line = fileToPrint.ReadLine();
                if (line == null)
                {
                    break;
                }
                yPos = topMargin + count * printFont.GetHeight(e.Graphics);
                e.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, new StringFormat());
                count++;
            }
            if (line != null)
            {
                e.HasMorePages = true;

            }
        }
    }
}

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