如何:打印 Windows 窗体中的多页文本文件
更新:2007 年 11 月
对基于 Windows 的应用程序来说,打印文本非常常见。Graphics 类提供将对象(图形或文本)绘制到设备(如屏幕或打印机)的方法。
说明: |
---|
TextRenderer 的 DrawText 方法不支持打印。您应当始终使用 Graphics 的 DrawString 方法出于打印目的而绘制文本,如下面的代码示例所示。 |
打印文本
向窗体添加一个 PrintDocument 组件和一个字符串。
Private printDocument1 As New PrintDocument() Private stringToPrint As String
private PrintDocument printDocument1 = new PrintDocument(); private string stringToPrint;
如果打印文档,请将 DocumentName 属性设置为要打印的文档,然后打开并读取文档内容到以前添加的字符串。
Dim docName As String = "testPage.txt" Dim docPath As String = "c:\" printDocument1.DocumentName = docName Dim stream As New FileStream(docPath + docName, FileMode.Open) Try Dim reader As New StreamReader(stream) Try stringToPrint = reader.ReadToEnd() Finally reader.Dispose() End Try Finally stream.Dispose() End Try
string docName = "testPage.txt"; string docPath = @"c:\"; printDocument1.DocumentName = docName; using (FileStream stream = new FileStream(docPath + docName, FileMode.Open)) using (StreamReader reader = new StreamReader(stream)) { stringToPrint = reader.ReadToEnd(); }
在 PrintPage 事件处理程序中,使用 PrintPageEventArgs 类的 Graphics 属性以及文档内容来计算行长度和每页行数。每一页绘制后,检查该页是否是最后一页,并相应设置 PrintPageEventArgs 的 HasMorePages 属性。引发 PrintPage 事件,直到 HasMorePages 为 false。此外,确保 PrintPage 事件与其事件处理方法关联。
在下面的代码示例中,事件处理程序用于以窗体上所用的相同字体打印“testPage.txt”文件的内容。
Private Sub printDocument1_PrintPage(ByVal sender As Object, _ ByVal e As PrintPageEventArgs) Dim charactersOnPage As Integer = 0 Dim linesPerPage As Integer = 0 ' Sets the value of charactersOnPage to the number of characters ' of stringToPrint that will fit within the bounds of the page. e.Graphics.MeasureString(stringToPrint, Me.Font, e.MarginBounds.Size, _ StringFormat.GenericTypographic, charactersOnPage, linesPerPage) ' Draws the string within the bounds of the page e.Graphics.DrawString(stringToPrint, Me.Font, Brushes.Black, _ e.MarginBounds, StringFormat.GenericTypographic) ' Remove the portion of the string that has been printed. stringToPrint = stringToPrint.Substring(charactersOnPage) ' Check to see if more pages are to be printed. e.HasMorePages = stringToPrint.Length > 0 End Sub
private void printDocument1_PrintPage(object sender, PrintPageEventArgs e) { int charactersOnPage = 0; int linesPerPage = 0; // Sets the value of charactersOnPage to the number of characters // of stringToPrint that will fit within the bounds of the page. e.Graphics.MeasureString(stringToPrint, this.Font, e.MarginBounds.Size, StringFormat.GenericTypographic, out charactersOnPage, out linesPerPage); // Draws the string within the bounds of the page e.Graphics.DrawString(stringToPrint, this.Font, Brushes.Black, e.MarginBounds, StringFormat.GenericTypographic); // Remove the portion of the string that has been printed. stringToPrint = stringToPrint.Substring(charactersOnPage); // Check to see if more pages are to be printed. e.HasMorePages = (stringToPrint.Length > 0); }
-
printDocument1.Print()
printDocument1.Print();
示例
Imports System
Imports System.Drawing
Imports System.IO
Imports System.Drawing.Printing
Imports System.Windows.Forms
Public Class Form1
Inherits Form
Private printButton As Button
Private printDocument1 As New PrintDocument()
Private stringToPrint As String
Public Sub New()
Me.printButton = New System.Windows.Forms.Button()
Me.printButton.Location = New System.Drawing.Point(12, 51)
Me.printButton.Size = New System.Drawing.Size(75, 23)
Me.printButton.Text = "Print"
Me.ClientSize = New System.Drawing.Size(292, 266)
End Sub
Private Sub ReadFile()
Dim docName As String = "testPage.txt"
Dim docPath As String = "c:\"
printDocument1.DocumentName = docName
Dim stream As New FileStream(docPath + docName, FileMode.Open)
Try
Dim reader As New StreamReader(stream)
Try
stringToPrint = reader.ReadToEnd()
Finally
reader.Dispose()
End Try
Finally
stream.Dispose()
End Try
End Sub
Private Sub printDocument1_PrintPage(ByVal sender As Object, _
ByVal e As PrintPageEventArgs)
Dim charactersOnPage As Integer = 0
Dim linesPerPage As Integer = 0
' Sets the value of charactersOnPage to the number of characters
' of stringToPrint that will fit within the bounds of the page.
e.Graphics.MeasureString(stringToPrint, Me.Font, e.MarginBounds.Size, _
StringFormat.GenericTypographic, charactersOnPage, linesPerPage)
' Draws the string within the bounds of the page
e.Graphics.DrawString(stringToPrint, Me.Font, Brushes.Black, _
e.MarginBounds, StringFormat.GenericTypographic)
' Remove the portion of the string that has been printed.
stringToPrint = stringToPrint.Substring(charactersOnPage)
' Check to see if more pages are to be printed.
e.HasMorePages = stringToPrint.Length > 0
End Sub
Private Sub printButton_Click(ByVal sender As Object, ByVal e As EventArgs)
ReadFile()
printDocument1.Print()
End Sub
<STAThread()> _
Shared Sub Main()
Application.EnableVisualStyles()
Application.SetCompatibleTextRenderingDefault(False)
Application.Run(New Form1())
End Sub
End Class
using System;
using System.Drawing;
using System.IO;
using System.Drawing.Printing;
using System.Windows.Forms;
namespace PrintApp
{
public class Form1 : Form
{
private Button printButton;
private PrintDocument printDocument1 = new PrintDocument();
private string stringToPrint;
public Form1()
{
this.printButton = new System.Windows.Forms.Button();
this.printButton.Location = new System.Drawing.Point(12, 51);
this.printButton.Size = new System.Drawing.Size(75, 23);
this.printButton.Text = "Print";
this.printButton.Click += new System.EventHandler(this.printButton_Click);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.printButton);
// Associate the PrintPage event handler with the PrintPage event.
printDocument1.PrintPage +=
new PrintPageEventHandler(printDocument1_PrintPage);
}
private void ReadFile()
{
string docName = "testPage.txt";
string docPath = @"c:\";
printDocument1.DocumentName = docName;
using (FileStream stream = new FileStream(docPath + docName, FileMode.Open))
using (StreamReader reader = new StreamReader(stream))
{
stringToPrint = reader.ReadToEnd();
}
}
private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
{
int charactersOnPage = 0;
int linesPerPage = 0;
// Sets the value of charactersOnPage to the number of characters
// of stringToPrint that will fit within the bounds of the page.
e.Graphics.MeasureString(stringToPrint, this.Font,
e.MarginBounds.Size, StringFormat.GenericTypographic,
out charactersOnPage, out linesPerPage);
// Draws the string within the bounds of the page
e.Graphics.DrawString(stringToPrint, this.Font, Brushes.Black,
e.MarginBounds, StringFormat.GenericTypographic);
// Remove the portion of the string that has been printed.
stringToPrint = stringToPrint.Substring(charactersOnPage);
// Check to see if more pages are to be printed.
e.HasMorePages = (stringToPrint.Length > 0);
}
private void printButton_Click(object sender, EventArgs e)
{
ReadFile();
printDocument1.Print();
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
编译代码
此示例要求:
对 System、System.Windows.Forms、System.Drawing 程序集的引用。
有关从 Visual Basic 或 Visual C# 的命令行生成此示例的信息,请参见从命令行生成 (Visual Basic) 或在命令行上使用 csc.exe 生成。也可以通过将代码粘贴到新项目,在 Visual Studio 中生成此示例。 有关更多信息,请参见如何:使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和如何:使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和如何:使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和如何:使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和如何:使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例.