using System;
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using System.Collections;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.HtmlControls;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Xml.Linq;
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using System.IO;
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namespace zjx.Web.Components.upload
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{
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public partial class Uploadimage : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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System.Drawing.Image thumbnail_image = null;
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System.Drawing.Image original_image = null;
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System.Drawing.Bitmap final_image = null;
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System.Drawing.Graphics graphic = null;
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MemoryStream ms = null;
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try
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{
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// Get the data
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HttpPostedFile jpeg_image_upload = Request.Files["Filedata"];
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// Retrieve the uploaded image
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original_image = System.Drawing.Image.FromStream(jpeg_image_upload.InputStream);
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// Calculate the new width and height
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int width = original_image.Width;
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int height = original_image.Height;
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int target_width = 100;
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int target_height = 100;
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int new_width, new_height;
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string val=Request.Form["oldfilename"];
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if (!string.IsNullOrEmpty(val) && val != "wu_photo.gif" && File.Exists(Server.MapPath("../../public/report/" + val)))
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{
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File.Delete(Server.MapPath("../../public/report/" + val));
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}
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float target_ratio = (float)target_width / (float)target_height;
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float image_ratio = (float)width / (float)height;
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if (target_ratio > image_ratio)
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{
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new_height = target_height;
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new_width = (int)Math.Floor(image_ratio * (float)target_height);
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}
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else
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{
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new_height = (int)Math.Floor((float)target_width / image_ratio);
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new_width = target_width;
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}
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new_width = new_width > target_width ? target_width : new_width;
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new_height = new_height > target_height ? target_height : new_height;
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// Create the thumbnail
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// Old way
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//thumbnail_image = original_image.GetThumbnailImage(new_width, new_height, null, System.IntPtr.Zero);
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// We don't have to create a Thumbnail since the DrawImage method will resize, but the GetThumbnailImage looks better
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// I've read about a problem with GetThumbnailImage. If a jpeg has an embedded thumbnail it will use and resize it which
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// can result in a tiny 40x40 thumbnail being stretch up to our target size
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final_image = new System.Drawing.Bitmap(target_width, target_height);
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graphic = System.Drawing.Graphics.FromImage(final_image);
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graphic.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.White), new System.Drawing.Rectangle(0, 0, target_width, target_height));
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int paste_x = (target_width - new_width) / 2;
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int paste_y = (target_height - new_height) / 2;
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graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; /* new way */
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//graphic.DrawImage(thumbnail_image, paste_x, paste_y, new_width, new_height);
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graphic.DrawImage(original_image, paste_x, paste_y, new_width, new_height);
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// Store the thumbnail in the session (Note: this is bad, it will take a lot of memory, but this is just a demo)
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ms = new MemoryStream();
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string thumbnail_id = DateTime.Now.ToString("yyyyMMddHHmmssfff")+".jpg";
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final_image.Save(Server.MapPath("../../public/report/") + thumbnail_id, System.Drawing.Imaging.ImageFormat.Jpeg);
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// Store the data in my custom Thumbnail object
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Response.StatusCode = 200;
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Response.Write(thumbnail_id);
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}
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catch(Exception x)
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{
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// If any kind of error occurs return a 500 Internal Server error
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Response.StatusCode = 500;
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Response.Write(x);
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Response.End();
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}
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finally
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{
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// Clean up
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if (final_image != null) final_image.Dispose();
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if (graphic != null) graphic.Dispose();
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if (original_image != null) original_image.Dispose();
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if (thumbnail_image != null) thumbnail_image.Dispose();
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if (ms != null) ms.Close();
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Response.End();
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}
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}
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}
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}
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