Asp.net İle Dinamik Thumbnail Oluşturma

Anasayfa / Asp.net / 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

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;
    }

}

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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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