C#實(shí)現(xiàn)打印功能實(shí)例詳解
C#實(shí)現(xiàn)打印功能是通過(guò)使用PrintDialog控件來(lái)實(shí)現(xiàn)的。任何物有所值的應(yīng)用程序都會(huì)擁有某種打印功能,不管是基本的打印功能還是更為復(fù)雜的打印功能,比如允許用戶只打印所選的文本或某個(gè)范圍內(nèi)的頁(yè)面。本節(jié)將探討一下實(shí)現(xiàn)基本的C#打印功能,看看哪些類(lèi)有助于打印文件中的文本。C#實(shí)現(xiàn)打印功能的過(guò)程是:在調(diào)用PrintDialog控件的ShowDialog方法之前,必須先設(shè)置PrintDialog類(lèi)的Document屬性。該屬性接受一個(gè)PrintDocument類(lèi),以獲得打印機(jī)設(shè)置并將輸出內(nèi)容發(fā)送給打印機(jī)。PrintDocument類(lèi)需要System.Drawing.Printing名稱空間,因此,在定義使用PrintDocument類(lèi)的對(duì)象前,必須包含這個(gè)名稱空間。
C#實(shí)現(xiàn)打印功能具體的操作步驟如下:
創(chuàng)建一個(gè)PrintDialog的實(shí)例。如下:
- System.Windows.Forms.PrintDialog PrintDialog1=new PrintDialog ();
創(chuàng)建一個(gè)PrintDocument的實(shí)例.如下:
- System.Drawing.Printing.PrintDocument docToPrint =
- new System.Drawing.Printing.PrintDocument();
設(shè)置打印機(jī)開(kāi)始打印的事件處理函數(shù).函數(shù)原形如下:
- void docToPrint_PrintPage(object sender,
- System.Drawing.Printing.PrintPageEventArgs e)
將事件處理函數(shù)添加到PrintDocument的PrintPage事件中。
- docToPrint.PrintPage+=
- new PrintPageEventHandler(docToPrint_PrintPage);
設(shè)置PrintDocument的相關(guān)屬性,如:
- PrintDialog1.AllowSomePages =
- true;PrintDialog1.ShowHelp = true;
把PrintDialog的Document屬性設(shè)為上面配置好的PrintDocument的實(shí)例:
- PrintDialog1.Document = docToPrint;
調(diào)用PrintDialog的ShowDialog函數(shù)顯示打印對(duì)話框:
- DialogResult result = PrintDialog1.ShowDialog();
根據(jù)用戶的選擇,開(kāi)始打印:
- if (result==DialogResult.OK)
- {
- docToPrint.Print();
- }
C#實(shí)現(xiàn)打印功能的實(shí)例如下:
使用時(shí)先創(chuàng)建PrintService類(lèi)的實(shí)例,然后調(diào)用void StartPrint(Stream streamToPrint,string streamType)函數(shù)開(kāi)始打印。其中streamToPrint是要打印的內(nèi)容(字節(jié)流),streamType是流的類(lèi)型(txt表示普通文本,image表示圖像);
- using System;
- using System.Drawing.Printing;
- using System.Windows.Forms;
- using System.IO;
- namespace EDImageSystem
- {
- /// <summary>
- /// PrintService 的摘要說(shuō)明。
- /// </summary>
- public class PrintService
- {
- public PrintService()
- {
- //
- // TODO: 在此處添加構(gòu)造函數(shù)邏輯
- //
- this.docToPrint.PrintPage+=
- new PrintPageEventHandler(docToPrint_PrintPage);
- }//將事件處理函數(shù)添加到PrintDocument的PrintPage中
- // Declare the PrintDocument object.
- private System.Drawing.Printing.PrintDocument docToPrint =
- new System.Drawing.Printing.PrintDocument();
- //創(chuàng)建一個(gè)PrintDocument的實(shí)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 ();//實(shí)現(xiàn)C#打印之創(chuàng)建一個(gè)PrintDialog的實(shí)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屬性設(shè)為上面配置好的PrintDocument的實(shí)例
- DialogResult result = PrintDialog1.ShowDialog();
- //調(diào)用PrintDialog的ShowDialog函數(shù)顯示打印對(duì)話框
- // If the result is OK then print the document.
- if (result==DialogResult.OK)
- {
- docToPrint.Print();//實(shí)現(xiàn)C#打印之開(kāi)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)
- //設(shè)置打印機(jī)開(kāi)始打印的事件處理函數(shù)
- {
- // 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;
- }
- }
- }
- }
實(shí)現(xiàn)C#打印的具體實(shí)現(xiàn)步驟和具體的實(shí)例演示就向你介紹到這里,希望對(duì)你了解實(shí)現(xiàn)C#打印以及學(xué)習(xí)C#有所幫助。
【編輯推薦】