求助,img显示图像限制问题?
我用img装载显示图像时,为了让图像一目了然,我将尺寸太大图像按页面大小等比缩小,但现在出现一个问题就是当图像大小超过13M时加载的图像就不显示,但图像在,右击可以保存图像,是不是img显示图像有限制?哪位能帮忙解决一下!谢谢!
<img alt="缩略图" id="Img1" src="" style="cursor: move;" onload="showImage()"/> <script language="javascript" type="text/javascript"> function showImage() { var Wmax=document.body.scrollWidth; var ImgD=document.getElementById("Img1"); ImgD.src="<%=ScaleGrid_Load()%>"; if(typeof(ImgD)== "object") { //判断ImgD装载过后是否为对象,防止异常操作 var widthL=0; var heightL=0; var W=ImgD.width; var H=ImgD.height; if(W>Wmax) { widthL=Wmax; heightL=(H+20)/((W+20)/Wmax); //+20是因为IE方式的默认边距 } else { return ; } if(widthL!=0&&heightL!=0) { ImgD.style.width=widthL+"px"; ImgD.style.height=heightL+"px"; } else { setTimeout( "showImage()", 100); // 判断图片是否装载完成,只有在装载完成后才能取到宽高值 } } else { return; //alert( "系统错误 "); } } </script>用上面的方法可以实现图像比较小的图像显示,但超过了13M就不显示了!!
现在有几种方法实现 1> Image imge = Image.FromFile(file.FullName); this.imageList1.Images.Add(imge.GetThumbnailImage(32,32,null,IntPtr.Zero)) item.ImageIndex = this.imageList1.Images.Count - 1; 2>public Image MakeThumbnail(string originalImagePath, int width, int height, string mode) { System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath); int towidth = width; int toheight = height; int x = 0; int y = 0; int ow = originalImage.Width; int oh = originalImage.Height; switch (mode) { case "HW"://指定高宽缩放(可能变形) break; case "W"://指定宽,高按比例 toheight = originalImage.Height * width / originalImage.Width; break; case "H"://指定高,宽按比例 towidth = originalImage.Width * height / originalImage.Height; break; case "Cut"://指定高宽裁减(不变形) if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) { oh = originalImage.Height; ow = originalImage.Height * towidth / toheight; y = 0; x = (originalImage.Width - ow) / 2; } else { ow = originalImage.Width; oh = originalImage.Width * height / towidth; x = 0; y = (originalImage.Height - oh) / 2; } break; default: break; } //新建一个bmp图片 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); //新建一个画板 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(System.Drawing.Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel); try { return (Image)bitmap.Clone(); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } } 3> [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdiplusStartup(long token, string lpWindowName, GdiplusStartupInput inputbuf, ref long outputbuf); [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdiplusShutdown(long token); [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdipDrawImageRect(long graphics, long image, int X, int Y, int Width, int Height); [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdipCreateFromHDC(long hDC, long graphics); [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdipDeleteGraphics(long graphics); [DllImport("gdi32.dll", EntryPoint = "FindWindow")] private static extern GpStatus GdipLoadImageFromFile(string filename, long image); [DllImport("gdi32.dll", EntryPoint = "FindWindow")]
1、在aspx文件加上aspcompat=true <%@ Page language="c#" Codebehind="AddProduct.aspx.cs" AutoEventWireup="false" Inherits="Techsun.XYD.AdminOfXYD.AddProduct" aspcompat=true%> 2、在vs里引用com组件wsImage.dll 3、生成缩略图 wsImage.Resize obj = (wsImage.Resize)Server.CreateObject("wsImage.Resize"); string FilePath = Server.MapPath("25.jpg"); string strOutputPic = Server.MapPath("25_s.jpg"); int w = 125; int h = 125; int lngType = 0; obj.LoadSoucePic(FilePath); obj.Quality = 100; obj.OutputSpic(strOutputPic,w,h,lngType); obj.Free();