using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Printing;using System.Linq;using System.Text;namespace BIPS.Print{ public class PrintDocumentImage { public event Action EndPrint; List
listimage; ///
/// /// ///
img, int Copies) { PrintDocument printdoc = new PrintDocument();//Duplex printdoc.DocumentName = documentNo; printdoc.PrinterSettings.PrinterName = PrintName; printdoc.PrinterSettings.Copies = (short)Copies; printdoc.DefaultPageSettings.Color = color;//参数设置 printdoc.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0); if (img.Count >= 2) { //printdoc.PrinterSettings.Duplex = Duplex.Horizontal; printdoc.PrinterSettings.Duplex = Duplex.Default; } foreach (PaperSize ps in printdoc.PrinterSettings.PaperSizes) { if (ps.Kind.ToString().Equals(PageSize)) { printdoc.PrinterSettings.DefaultPageSettings.PaperSize = ps; printdoc.DefaultPageSettings.PaperSize = ps; } } this.listimage = img; printdoc.PrintPage += new PrintPageEventHandler(printdoc_PrintPage); printdoc.EndPrint += new PrintEventHandler(printdoc_EndPrint); this.listimage = img; printdoc.Print(); } void printdoc_EndPrint(object sender, PrintEventArgs e) { if (EndPrint != null) { EndPrint("打印完成"); } } private void printdoc_PrintPage(object sender, PrintPageEventArgs e) { if (listimage.Count > 0) { //如果是base64字符串则将base64转成图片 Image inBitmap; if (listimage[0].Length > 500) { //字符串过程认为是base64string byte[] buffer = System.Convert.FromBase64String(listimage[0]); using (System.IO.MemoryStream ms = new System.IO.MemoryStream(buffer)) { inBitmap = Image.FromStream(ms); } } else { inBitmap = Image.FromFile(listimage[0]); } using (inBitmap) { //打印机绘图宽高 int stdBitmapWidth = e.PageBounds.Width; int stdBitmapHeight = e.PageBounds.Height; //如果宽度比高度大，则进行旋转 if (inBitmap.Width > inBitmap.Height) { inBitmap.RotateFlip(RotateFlipType.Rotate90FlipNone); } //计算 打印机绘图区域宽高比 double width_Height = stdBitmapWidth * 1.0 / stdBitmapHeight; //计算 原图宽高比 double sWidth_Height = inBitmap.Width * 1.0 / inBitmap.Height; //打印机绘制区域的 区域 int heigth = stdBitmapHeight; int width = stdBitmapWidth; int x = 0; int y = 0; //如果图片区域比 打印机绘图区域大则需要缩放 if (stdBitmapHeight < inBitmap.Height || stdBitmapWidth < inBitmap.Width) { //如果是高度很高的图片，则按图片比例调整绘制宽度 if (width_Height > sWidth_Height) { width = (int)(sWidth_Height * heigth); //调整到左右的中间。 x = (stdBitmapWidth - width) / 2; } //如果是宽度比较宽的图片，则按图片比例调整绘制高度 else if (width_Height < sWidth_Height) { heigth = (int)(width / sWidth_Height); //t调整到上下的中间。 y = (stdBitmapHeight - heigth) / 2; } } //如果图片宽高都比绘图区域小，则不需要进行缩放。直接绘制在打印机绘图区域中央。 else { width = inBitmap.Width; heigth = inBitmap.Height; x = (stdBitmapWidth - inBitmap.Width) / 2; y = (stdBitmapHeight - inBitmap.Height) / 2; } //绘制区域 Rectangle stdRec = new Rectangle(x, y, width, heigth); //将图片绘制到打印机，绘图区域。 e.Graphics.DrawImage(inBitmap, stdRec, new Rectangle(0, 0, inBitmap.Width, inBitmap.Height), GraphicsUnit.Pixel); listimage.RemoveAt(0); if (listimage.Count > 0) { e.HasMorePages = true; } else { e.HasMorePages = false; } } } } }}