C# 文本文件打印类库(C#)
我写了一个打印文本文件的类库,功能包括:打印预览、打印。打印时可以选择打印机,可以指定页码范围。调用方法非常简单:
TextFilePrinter p = new TextFilePrinter(tbxFileName.Text);
p.View(); // 打印预览
p.Print(); // 打印文件
使用 TextFilePrinter 类的以下构造函数可以指定打印时使用的字体:
TextFilePrinter(string fileName, Encoding theEncode, Font theFont)
下面测试程序运行时的截图:
点击“预览”按钮后:
点击“打印”按钮后:
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,用来调试打印程序非常方便(使用“打印预览”也可以调试打印程序,但“打印预览”只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),可以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,可以节省不少打印纸。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。
这里是测试程序的源代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
// 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"; 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()); } } }
这里是该类的源代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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:当文本文件中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。