Asp.net İle Dinamik Thumbnail Oluşturma

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Merhaba arkadaşlar, bugünkü kod kırıntılarında sizlere dinamik olarak thumbnail oluşturma kod pıtırcıklarını paylaşıcam.

Yok illa ben kodları görücem diyorsanız kaputun altı aşağıdaki gibidir.

Dosya isminin thumbnail.aspx olduğunu varsayarsak

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;
using System.Web;
using System.Web.UI;

public partial class thumbnail : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string image = Request.QueryString["Image"];
        if (string.IsNullOrEmpty(image))
        {
            this.ErrorResult();
            return;
        }

        string sSize = Request.QueryString["Size"];
        int size = 313;
        if (!string.IsNullOrEmpty(sSize) && !int.TryParse(sSize, out size))
        {
            this.ErrorResult();
            return;
        }

        string path;
        if (image.IndexOf("sliders", StringComparison.OrdinalIgnoreCase) == -1)
        {
            path = Server.MapPath("/uploads/eticaret/" + image);
        }
        else
        {
            path = Server.MapPath("/uploads/slider/" + image.Split('_')[1]);
        }

        if (!File.Exists(path))
        {
            this.ErrorResult();
            return;
        }

        Bitmap bmp;
        try
        {
            bmp = CreateThumbnails(path, size);
        }
        catch
        {
            this.ErrorResult();
            return;
        }

        if (bmp == null)
        {
            this.ErrorResult();
            return;
        }

        string imagePath = Server.MapPath("/uploads/" + size + "_" + image);
        Response.ContentType = "image/jpeg";
        try
        {
            if (File.Exists(imagePath))
            {
                Response.WriteFile(imagePath);
            }
            else
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    bmp.Save(ms, ImageFormat.Jpeg);
                    ms.WriteTo(Response.OutputStream);
                    bmp.Save(imagePath, ImageFormat.Jpeg);
                }
            }
        }
        catch
        {
            this.ErrorResult();
        }
        finally
        {
            bmp.Dispose();
        }
    }

    private void ErrorResult()
    {
        Response.Clear();
        Response.StatusCode = 404;
        Response.End();
    }

    public static Bitmap CreateThumbnails(string lcFilename, int targetSize)
    {
        Bitmap bmpOut = new Bitmap(targetSize, targetSize);
        try
        {
            using (Bitmap originalBmp = new Bitmap(lcFilename))
            {
                float ratio = Math.Min((float)targetSize / originalBmp.Width, (float)targetSize / originalBmp.Height);
                int newWidth = (int)(originalBmp.Width * ratio);
                int newHeight = (int)(originalBmp.Height * ratio);

                using (Graphics g = Graphics.FromImage(bmpOut))
                {
                    g.CompositingQuality = CompositingQuality.HighQuality;
                    g.SmoothingMode = SmoothingMode.HighQuality;
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    g.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    g.Clear(Color.White);

                    int posX = (targetSize - newWidth) / 2;
                    int posY = (targetSize - newHeight) / 2;
                    g.DrawImage(originalBmp, posX, posY, newWidth, newHeight);
                }
            }
        }
        catch
        {
            bmpOut.Dispose();
            return null;
        }

        return bmpOut;
    }
}

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using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Drawing.Drawing2D;

using System.IO;

using System.Web;

using System.Web.UI;

public partial class thumbnail : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

string image = Request.QueryString["Image"];

if (string.IsNullOrEmpty(image))

{

this.ErrorResult();

return;

}

string sSize = Request.QueryString["Size"];

int size = 313;

if (!string.IsNullOrEmpty(sSize) && !int.TryParse(sSize, out size))

{

this.ErrorResult();

return;

}

string path;

if (image.IndexOf("sliders", StringComparison.OrdinalIgnoreCase) == -1)

{

path = Server.MapPath("/uploads/eticaret/" + image);

}

else

{

path = Server.MapPath("/uploads/slider/" + image.Split('_')[1]);

}

if (!File.Exists(path))

{

this.ErrorResult();

return;

}

Bitmap bmp;

try

{

bmp = CreateThumbnails(path, size);

}

catch

{

this.ErrorResult();

return;

}

if (bmp == null)

{

this.ErrorResult();

return;

}

string imagePath = Server.MapPath("/uploads/" + size + "_" + image);

Response.ContentType = "image/jpeg";

try

{

if (File.Exists(imagePath))

{

Response.WriteFile(imagePath);

}

else

{

using (MemoryStream ms = new MemoryStream())

{

bmp.Save(ms, ImageFormat.Jpeg);

ms.WriteTo(Response.OutputStream);

bmp.Save(imagePath, ImageFormat.Jpeg);

}

catch

{

this.ErrorResult();

}

finally

{

bmp.Dispose();

}

private void ErrorResult()

{

Response.Clear();

Response.StatusCode = 404;

Response.End();

}

public static Bitmap CreateThumbnails(string lcFilename, int targetSize)

{

Bitmap bmpOut = new Bitmap(targetSize, targetSize);

try

{

using (Bitmap originalBmp = new Bitmap(lcFilename))

{

float ratio = Math.Min((float)targetSize / originalBmp.Width, (float)targetSize / originalBmp.Height);

int newWidth = (int)(originalBmp.Width * ratio);

int newHeight = (int)(originalBmp.Height * ratio);

using (Graphics g = Graphics.FromImage(bmpOut))

{

g.CompositingQuality = CompositingQuality.HighQuality;

g.SmoothingMode = SmoothingMode.HighQuality;

g.InterpolationMode = InterpolationMode.HighQualityBicubic;

g.PixelOffsetMode = PixelOffsetMode.HighQuality;

g.Clear(Color.White);

int posX = (targetSize - newWidth) / 2;

int posY = (targetSize - newHeight) / 2;

g.DrawImage(originalBmp, posX, posY, newWidth, newHeight);

}

catch

{

bmpOut.Dispose();

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 🙂

Yazar

Harun Kılıçlar

Kurucu / Teknoloji Editörü

Harun, yazılım geliştirme, web teknolojileri, mobil uygulamalar, veritabanı sistemleri ve yapay zekâ üzerine çalışan bir teknoloji editörüdür. SanalData’nın kurucusu olarak yazılım, yapay zekâ, mobil teknolojiler ve teknoloji sektöründeki gelişmeleri izler ve değerlendirir.

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