【转】C# PrintDocument打印 多页 打印预览
PrintDocument实例所有的订阅事件如下：
1.创建一个PrintDocument的实例.如下：
System.Drawing.Printing.PrintDocument docToPrint =
new System.Drawing.Printing.PrintDocument();
2.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)
3.将事件处理函数添加到PrintDocument的PrintPage事件中。
docToPrint.PrintPage+=new PrintPageEventHandler(docToPrint_PrintPage);
4.设置PrintDocument的相关属性，如：
PrintDialog1.AllowSomePages = true;PrintDialog1.ShowHelp = true;
5.把PrintDialog的Document属性设为上面配置好的PrintDocument的实例：
PrintDialog1.Document = docToPrint;
6.调用PrintDialog的ShowDialog函数显示打印对话框：
DialogResult result = PrintDialog1.ShowDialog();
7.根据用户的选择，开始打印：
if (result==DialogResult.OK)
{
docToPrint.Print();
}
8.打印预览控件PrintPreviewDialog
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）；
public partial class PrintTxt |
{ |
private PrintPreviewDialog PrintPreview = new PrintPreviewDialog(); |
private string StreamType; |
private Image image = null; |
private Stream StreamToPrint = null; |
Font mainFont = new Font("宋体", 12);//打印的字体 |
public string Filename =null; |
|
|
//1、实例化打印文档 |
PrintDocument pdDocument = new PrintDocument(); |
private string[] lines; |
private int linesPrinted; |
public PrintTxt(string filepath,string filetype) |
{ |
|
Filename = Path.GetFileNameWithoutExtension(filepath); |
//订阅BeginPrint事件 |
pdDocument.BeginPrint += new PrintEventHandler(pdDocument_BeginPrint); |
//訂閱EndPrint事件，释放资源 |
|
|
pdDocument.PrintPage += new PrintPageEventHandler(OnPrintPage); |
//订阅Print打印事件,该方法必须放在订阅打印事件的最后 |
FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read); |
StartPrint(fs, filetype); |
//打印结束 |
pdDocument.EndPrint += new PrintEventHandler(pdDocument_EndPrint); |
} |
//2、启动Print打印方法 |
public void StartPrint(Stream streamToPrint, string streamType) |
{ |
//返回值的PageSettings A4\A5 |
PageSettings ps = new PageSettings(); |
//显示设置打印页对话框 |
PageSetupDialog Psdl = new PageSetupDialog(); |
//打印多份设置，注意，该方法需放在printpage方法后面。 |
PrintDialog pt = new PrintDialog(); |
pt.AllowCurrentPage = true; |
pt.AllowSomePages = true; |
pt.AllowPrintToFile = true; |
StreamToPrint = streamToPrint;//打印的字节流 |
StreamType = streamType; //打印的类型 |
pdDocument.DocumentName = Filename; //打印的文件名 |
Psdl.Document = pdDocument; |
PrintPreview.Document = pdDocument; |
pt.Document = pdDocument; |
Psdl.PageSettings = pdDocument.DefaultPageSettings; |
try |
{ |
//显示对话框 |
if (Psdl.ShowDialog() == DialogResult.OK) |
{ |
ps = Psdl.PageSettings; |
pdDocument.DefaultPageSettings = Psdl.PageSettings; |
} |
if (pt.ShowDialog() == DialogResult.OK) |
{ |
pdDocument.PrinterSettings.Copies = pt.PrinterSettings.Copies; |
pdDocument.Print(); |
} |
if(PrintPreview.ShowDialog()==DialogResult.OK ) |
//调用打印 |
pdDocument.Print(); |
|
* PrintDocument对象的Print()方法在PrintController类中执行PrintPage事件。 |
*/ |
} |
catch (InvalidPrinterException ex) |
{ |
MessageBox.Show(ex.Message, "Simple Editor", MessageBoxButtons.OK, MessageBoxIcon.Error); |
throw; |
} |
} |
/// <summary> |
/// 3、得到打印內容 |
/// 每个打印任务只调用OnBeginPrint()一次。 |
/// </summary> |
/// <param name="sender"></param> |
/// <param name="e"></param> |
void pdDocument_BeginPrint(object sender, PrintEventArgs e) |
{ |
char[] param = { '\n' }; |
char[] trimParam = { '\r' };//回车 |
switch (StreamType) |
{ |
case "txt": |
StringBuilder text = new StringBuilder(); |
System.IO.StreamReader streamReader = new StreamReader(StreamToPrint, Encoding.Default); |
while (streamReader.Peek() >= 0) |
{ |
lines = streamReader.ReadToEnd().Split(param); |
for (int i = 0; i < lines.Length; i++) |
{ |
lines[i] = lines[i].TrimEnd(trimParam); |
} |
} |
break; |
case "image": |
image = System.Drawing.Image.FromStream(StreamToPrint); |
break; |
default: |
break; |
} |
} |
/// <summary> |
/// 4、绘制多个打印界面 |
/// printDocument的PrintPage事件 |
/// </summary> |
/// <param name="sender"></param> |
/// <param name="e"></param> |
private void OnPrintPage(object sender, PrintPageEventArgs e) |
{ |
int leftMargin = Convert.ToInt32((e.MarginBounds.Left) * 3 / 4); //左边距 |
int topMargin = Convert.ToInt32(e.MarginBounds.Top * 2 / 3); //顶边距 |
switch (StreamType) |
{ |
case "txt": |
while (linesPrinted < lines.Length) |
{ |
//向画布中填写内容 |
e.Graphics.DrawString(lines[linesPrinted++], new Font("Arial", 10), Brushes.Black, leftMargin, topMargin, new StringFormat()); |
topMargin += 55;//行高为55，可调整 |
//走纸换页 |
if (topMargin >= e.PageBounds.Height - 60)//页面累加的高度大于页面高度。根据自己需要，可以适当调整 |
{ |
//如果大于设定的高 |
e.HasMorePages = true; |
/* |
* PrintPageEventArgs类的HaeMorePages属性为True时，通知控件器，必须再次調用OnPrintPage()方法，打印一个页面。 |
* PrintLoopI()有一个用於每个要打印的页面的序例。如果HasMorePages是False，PrintLoop()就会停止。 |
*/ |
return; |
} |
} |
break; |
case "image"://一下涉及剪切图片, |
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(topMargin, leftMargin, width, height); |
//向画布写入图片 |
for (int i = 0; i < Convert.ToInt32(Math.Floor((double)image.Height/ 820)) + 1; i++) |
{ |
|
e.Graphics.DrawImage(image, destRect, i*820,i*1170 , image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel); |
//走纸换页 |
if (i * 1170 >= e.PageBounds.Height - 60)//页面累加的高度大于页面高度。根据自己需要，可以适当调整 |
{ |
//如果大于设定的高 |
e.HasMorePages = true; |
/* |
* PrintPageEventArgs类的HaeMorePages属性为True时，通知控件器，必须再次調用OnPrintPage()方法，打印一个页面。 |
* PrintLoopI()有一个用於每个要打印的页面的序例。如果HasMorePages是False，PrintLoop()就会停止。 |
*/ |
return; |
} |
} |
|
break; |
} |
//打印完毕后，画线条，且注明打印日期 |
e.Graphics.DrawLine(new Pen(Color.Black), leftMargin, topMargin, e.MarginBounds.Right, topMargin); |
string strdatetime = DateTime.Now.ToLongDateString() + DateTime.Now.ToLongTimeString(); |
e.Graphics.DrawString(string.Format("打印时间：{0}", strdatetime), mainFont, Brushes.Black, e.MarginBounds.Right-240, topMargin+40, new StringFormat()); |
linesPrinted = 0; |
//绘制完成后，关闭多页打印功能 |
e.HasMorePages = false; |
} |
/// <summary> |
///5、EndPrint事件,释放资源 |
/// </summary> |
/// <param name="sender"></param> |
/// <param name="e"></param> |
void pdDocument_EndPrint(object sender, PrintEventArgs e) |
{ |
//变量Lines占用和引用的字符串数组，现在释放 |
lines = null; |
} |
|
} |
//PrintTxt simple = new PrintTxt("D:\\Mainsoft\\12.txt", "txt"); |
