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

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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)

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 { /// <summary> /// PrintService 的摘要说明。 /// </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.Height*e.MarginBounds.Width/image.Width; } else { height=e.MarginBounds.Height; width=image.Width*e.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; } } } }