文本文件打印类库(C#)

我写了一个打印文本文件的类库，功能包含：打印预览、打印。打印时能够选择打印机。能够指定页码范围。

调用方法很easy：

TextFilePrinter p = new TextFilePrinter(tbxFileName.Text);

p.View(); // 打印预览

p.Print(); // 打印文件

使用 TextFilePrinter 类的下面构造函数能够指定打印时使用的字体：

TextFilePrinter(string fileName, Encoding theEncode, Font theFont)

以下測试程序执行时的截图:

点击“预览”button后：

点击“打印”button后：

这幅图中的打印机：“Microsoft Office Doument Image Writer”是 Microsoft Office 2003 软件提供一个虚拟打印机，用来调试打印程序很方便(使用“打印预览”也能够调试打印程序，但“打印预览”仅仅能使用默认的打印机和默认的打印属性。也不能设置页码范围)，能够设置打印属性和页码范围以及打印份数。

使用它来调试打印程序，能够节省不少打印纸。为建设节约型社会作贡献 :)

这幅图就是该虚拟打印机在屏幕上的显示的结果。

这里是測试程序的源码：

// PrintFile.cs - 文件打印程序

// 编译方法: csc /t:winexe PrintFile.cs TextFilePrinter.cs

using System;

using System.Drawing;

using System.Windows.Forms;

using Skyiv.Util;

namespace Skyiv.Ben.Test

{

class PrintFileForm : Form

{

TextBox tbxFileName;

public PrintFileForm()

{

SuspendLayout();

Button btnFileName = new Button();

btnFileName.Text = "文件名称";

btnFileName.Location = new Point(10, 10);

btnFileName.Size = new Size(60, 24);

btnFileName.Click += new EventHandler(BtnFileName_Click);

Button btnPrint = new Button();

btnPrint.Text = "打印";

btnPrint.Location = new Point(75, 10);

btnPrint.Size = new Size(60, 24);

btnPrint.Click += new EventHandler(BtnPrint_Click);

Button btnView = new Button();

btnView.Text = "预览";

btnView.Location = new Point(140, 10);

btnView.Size = new Size(60, 24);

btnView.Click += new EventHandler(BtnView_Click);

tbxFileName = new TextBox();

tbxFileName.Text = "PrintFile.cs";

tbxFileName.Location = new Point(10, 44);

tbxFileName.Size = new Size(190, 20);

tbxFileName.ReadOnly = true;

tbxFileName.Anchor = (AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right);

Controls.AddRange(new Control[]{btnFileName, btnPrint, btnView, tbxFileName});

Text = "文本文件打印程序";

ClientSize = new Size(210, 80);

ResumeLayout(false);

}

void BtnFileName_Click(object sender, EventArgs e)

{

OpenFileDialog dlg = new OpenFileDialog();

if(dlg.ShowDialog() != DialogResult.OK) return;

tbxFileName.Text = dlg.FileName;

}

void BtnPrint_Click(object sender, EventArgs e)

{

TextFilePrinter p = new TextFilePrinter(tbxFileName.Text);

p.Print();

}

void BtnView_Click(object sender, EventArgs e)

{

TextFilePrinter p = new TextFilePrinter(tbxFileName.Text);

p.View();

}

static void Main()

{

Application.Run(new PrintFileForm());

}

这里是该类的源码:

using System;

using System.Drawing;

using System.Drawing.Printing;

using System.Windows.Forms;

using System.IO;

using System.Text;

namespace Skyiv.Util

{

sealed class TextFilePrinter

{

string fileName;

Encoding theEncode;

Font theFont;

StreamReader srToPrint;

int currPage;

public TextFilePrinter(string fileName)

: this(fileName, Encoding.GetEncoding("GB18030"), new Font("新宋体", 10))

{

}

public TextFilePrinter(string fileName, Encoding theEncode, Font theFont)

{

this.fileName = fileName;

this.theEncode = theEncode;

this.theFont = theFont;

}

public void Print()

{

using (srToPrint = new StreamReader(fileName, theEncode))

{

PrintDialog dlg = new PrintDialog();

dlg.Document = GetPrintDocument();

dlg.AllowSomePages = true;

dlg.AllowPrintToFile = false;

if (dlg.ShowDialog() == DialogResult.OK) dlg.Document.Print();

}

public void View()

{

using (srToPrint = new StreamReader(fileName, theEncode))

{

PrintPreviewDialog dlg = new PrintPreviewDialog();

dlg.Document = GetPrintDocument();

dlg.ShowDialog();

}

PrintDocument GetPrintDocument()

{

currPage = 1;

PrintDocument doc = new PrintDocument();

doc.DocumentName = fileName;

doc.PrintPage += new PrintPageEventHandler(PrintPageEvent);

return doc;

}

void PrintPageEvent(object sender, PrintPageEventArgs ev)

{

string line = null;

float linesPerPage = ev.MarginBounds.Height / theFont.GetHeight(ev.Graphics);

bool isSomePages = ev.PageSettings.PrinterSettings.PrintRange == PrintRange.SomePages;

if (isSomePages)

{

while (currPage < ev.PageSettings.PrinterSettings.FromPage)

{

for (int count = 0; count < linesPerPage; count++)

{

line = srToPrint.ReadLine();

if (line == null) break;

}

if (line == null) return;

currPage++;

}

if (currPage > ev.PageSettings.PrinterSettings.ToPage) return;

}

for (int count = 0; count < linesPerPage; count++)

{

line = srToPrint.ReadLine();

if (line == null) break;

ev.Graphics.DrawString(line, theFont, Brushes.Black, ev.MarginBounds.Left,

ev.MarginBounds.Top + (count * theFont.GetHeight(ev.Graphics)), new StringFormat());

}

currPage++;

if (isSomePages && currPage > ev.PageSettings.PrinterSettings.ToPage) return;

if (line != null) ev.HasMorePages = true;

}

这些程序都相当简当明了，这里就不再解释了。

这个类库有个缺点：当文本文件里的一行不能在打印纸的一行中打印完时，该行的后半部就丢失了。

巴特西

文本文件打印类库(C#)

最新文章

热门文章