在C#中实现打印功能(C#中PrintDialog,PrintDocument的使用）

作者：邵令 2004-8-24 17:04:01
博客中国(Blogchina.com) b41830c

** 在C#中使用PrintDialog可以很方便的实现程序的打印功能。 **

其步骤如下：

** 创建一个PrintDialog的实例。如下：
System.Windows.Forms.PrintDialog PrintDialog1=new PrintDialog (); **
** 创建一个PrintDocument的实例. 如下：
System.Drawing.Printing.PrintDocument docToPrint =
new System.Drawing.Printing.PrintDocument(); **
** 设置打印机开始打印的事件处理函数.函数原形如下：
void docToPrint_PrintPage(object sender,
System.Drawing.Printing.PrintPageEventArgs e) **
** 将事件处理函数添加到PrintDocument的PrintPage事件中。
docToPrint.PrintPage+=new PrintPageEventHandler(docToPrint_PrintPage); **
** 设置PrintDocument的相关属性，如：
PrintDialog1.AllowSomePages = true;PrintDialog1.ShowHelp = true; **
** 把PrintDialog的Document属性设为上面配置好的PrintDocument的实例：
PrintDialog1.Document = docToPrint; **
** 调用PrintDialog的ShowDialog函数显示打印对话框：
DialogResult result = PrintDialog1.ShowDialog(); **
** 根据用户的选择，开始打印：
if (result==DialogResult.OK)
{
docToPrint.Print();
} ** ****

例子如下：

使用时先创建PrintService类的实例，然后调用void StartPrint(Stream streamToPrint,string streamType)函数开始打印。其中streamToPrint是要打印的内容（字节流），streamType是流的类型（txt表示普通文本，image表示图像）；

**using System;
using System.Drawing.Printing;
using System.Windows.Forms;
using System.IO; **

**namespace EDImageSystem
{
///

1<summary>   
2/// PrintService 的摘要说明。   
3/// </summary>

public class PrintService
{
public PrintService()
{
//
// TODO: 在此处添加构造函数逻辑
//
this.docToPrint.PrintPage+=new PrintPageEventHandler(docToPrint_PrintPage);
}// 将事件处理函数添加到PrintDocument的PrintPage中 **

**// Declare the PrintDocument object.
private System.Drawing.Printing.PrintDocument docToPrint =
new System.Drawing.Printing.PrintDocument();// 创建一个PrintDocument的实例 **

**private System.IO.Stream streamToPrint;
string streamType; **

**// This method will set properties on the PrintDialog object and
// then display the dialog.
public void StartPrint(Stream streamToPrint,string streamType)
{ **

**this.streamToPrint=streamToPrint;
this.streamType=streamType;
// Allow the user to choose the page range he or she would
// like to print.
System.Windows.Forms.PrintDialog PrintDialog1=new PrintDialog () ;//创建一个PrintDialog的实例。
PrintDialog1.AllowSomePages = true; **

**// Show the help button.
PrintDialog1.ShowHelp = true; **

**// Set the Document property to the PrintDocument for
// which the PrintPage Event has been handled. To display the
// dialog, either this property or the PrinterSettings property
// must be set
PrintDialog1.Document = docToPrint;// 把PrintDialog的Document属性设为上面配置好的PrintDocument的实例 **

**DialogResult result = PrintDialog1.ShowDialog();// 调用PrintDialog的ShowDialog函数显示打印对话框 **

**// If the result is OK then print the document.
if (result==DialogResult.OK)
{
docToPrint.Print();// 开始打印
} **

}

**// The PrintDialog will print the document
// by handling the document’s PrintPage event.
private void docToPrint_PrintPage(object sender,
System.Drawing.Printing.PrintPageEventArgs e)// 设置打印机开始打印的事件处理函数
{ **

**// Insert code to render the page here.
// This code will be called when the control is drawn. **

**// The following code will render a simple
// message on the printed document
switch(this.streamType)
{
case "txt":
string text = null;
System.Drawing.Font printFont = new System.Drawing.Font
("Arial", 35, System.Drawing.FontStyle.Regular); **

**// Draw the content.
System.IO.StreamReader streamReader=new StreamReader(this.streamToPrint);
text=streamReader.ReadToEnd();
e.Graphics.DrawString(text,printFont,System.Drawing.Brushes.Black,e.MarginBounds.X,e.MarginBounds.Y);
break;
case "image":
System.Drawing.Image image=System.Drawing.Image.FromStream(this.streamToPrint);
int x=e.MarginBounds.X;
int y=e.MarginBounds.Y;
int width=image.Width;
int height=image.Height;
if((width/e.MarginBounds.Width)>(height/e.MarginBounds.Height))
{
width=e.MarginBounds.Width;
height=image.Heighte.MarginBounds.Width/image.Width;
}
else
{
height=e.MarginBounds.Height;
width=image.Widthe.MarginBounds.Height/image.Height;
}
System.Drawing.Rectangle destRect=new System.Drawing.Rectangle(x,y,width,height);
e.Graphics.DrawImage(image,destRect,0,0,image.Width,image.Height,System.Drawing.GraphicsUnit.Pixel);
break;
default:
break;
}

} **

**}
} **

在C#中实现打印功能(C#中PrintDialog,PrintDocument的使用）

** 在C#中实现打印功能(C#中PrintDialog,PrintDocument的使用） **

在C#中实现打印功能(C#中PrintDialog,PrintDocument的使用）