Asp.net İle Dinamik Thumbnail Oluşturma
18 Mayıs 2017 / 11:52
Burak
Merhaba arkadaşlar, bugünkü kod kırıntılarında sizlere dinamik olarak thumbnail oluşturma kod pıtırcıklarını paylaşıcam.Kodlarla uğraşmak istemeyen direk burdan çekebilir kodlar ( hadi gene iyisiniz millet gibi uğraştırmıyorum sizi 🙂 )
Yok illa ben kodları görücem diyorsanız kaputun altı aşağıdaki gibidir.
Dosya isminin thumbnail.aspx olduğunu varsayarsak
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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Drawing; using System.Drawing.Imaging; public partial class thumbnail : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string Image = Request.QueryString["Image"]; if (Image == null) { this.ErrorResult(); return; } string sSize = Request["Size"]; int Size = 120; if (sSize != null) Size = Int32.Parse(sSize); string Path = Server.MapPath(Request.ApplicationPath) + "\\" + Image; Bitmap bmp = CreateThumbnails(Path, Size, Size); if (bmp == null) { this.ErrorResult(); return; } string OutputFilename = null; OutputFilename = Request.QueryString["OutputFilename"]; if (OutputFilename != null) { if (this.User.Identity.Name == "") { // *** Custom error display here bmp.Dispose(); this.ErrorResult(); } try { bmp.Save(OutputFilename); } catch (Exception ex) { bmp.Dispose(); this.ErrorResult(); return; } } // Put user code to initialize the page here Response.ContentType = "image/jpeg"; bmp.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); bmp.Dispose(); } private void ErrorResult() { Response.Clear(); Response.StatusCode = 404; Response.End(); } /// /// Creates a resized bitmap from an existing image on disk. /// Call Dispose on the returned Bitmap object /// /// /// /// /// Bitmap or null public static Bitmap CreateThumbnails(string lcFilename, int lnWidth, int lnHeight) { System.Drawing.Bitmap bmpOut = null; try { Bitmap loBMP = new Bitmap(lcFilename); ImageFormat loFormat = loBMP.RawFormat; decimal lnRatio; int lnNewWidth = 0; int lnNewHeight = 0; //*** If the image is smaller than a thumbnail just return it if (loBMP.Width < lnWidth && loBMP.Height < lnHeight) return loBMP; if (loBMP.Width > loBMP.Height) { lnRatio = (decimal)lnWidth / loBMP.Width; lnNewWidth = lnWidth; decimal lnTemp = loBMP.Height * lnRatio; lnNewHeight = (int)lnTemp; } else { lnRatio = (decimal)lnHeight / loBMP.Height; lnNewHeight = lnHeight; decimal lnTemp = loBMP.Width * lnRatio; lnNewWidth = (int)lnTemp; } // System.Drawing.Image imgOut = // loBMP.GetThumbnailImage(lnNewWidth,lnNewHeight, // null,IntPtr.Zero); // *** This code creates cleaner (though bigger) thumbnails and properly // *** and handles GIF files better by generating a white background for // *** transparent images (as opposed to black) bmpOut = new Bitmap(lnNewWidth, lnNewHeight); Graphics g = Graphics.FromImage(bmpOut); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight); g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight); loBMP.Dispose(); } catch { return null; } return bmpOut; } } |
Kullanımı ise aşağıdaki gibidir
http://www.domain.com/thumbnail.aspx?image=resim_yolu.jpg&size=resim_boyut
Herkese bol debuglu bol queryli günler 🙂
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