How to retrieve saved image as thumbnail from select query ?

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DataTable dt3 = dbo.GetRecordsWithQuery("select id,'' as url,image,'' as thumb from Image order by id desc");

for (int i = 0; i < dt3.Rows.Count; i++)
{
byte[] val = (byte[])dt3.Rows[i][2];
MemoryStream ms = new MemoryStream(val);

System.Drawing.Image newImage = System.Drawing.Image.FromStream(ms);
newImage.Save(Server.MapPath("~/Images/temp/img" + i.ToString() + ".jpg"));
dt3.Rows[i][1] = "Images/temp/img" + i.ToString() + ".jpg";

}

Here i retrieve saved image as image url. But i didnt know how to retrieve as thumbnail.. Can anyone help me ?

Thanks in advance :)

Posted 18-Jan-13 18:26pm

Sasikala Gurusamy

Updated 18-Jan-13 20:07pm

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lewax00 · Answer 1 · 2013-01-18T18:43:00

As far as I'm aware, you can't convert it to a thumbnail via SQL query, you have to convert it your application code either when you save it (e.g. save it with a thumbnail version in addition to the full size) or after you retrieve it from the database. For these sorts of tasks I find ImageMagick[^] to be useful. And specifically, here's a page on generating thumbails[^].

Valery Possoz · Answer 2 · 2013-01-18T23:00:00

Hello.

you can use

Image.GetThumbnailImage Method

to perform this task.
see MSDN here:
http://msdn.microsoft.com/en-us/library/system.drawing.image.getthumbnailimage.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2[^]

that's a code example of what you could do:

public bool ThumbnailCallback()
{
    return false;
}

//your code below...

DataTable dt3 = dbo.GetRecordsWithQuery("select id,'' as url,image,'' as thumb from Image order by id desc");
 
for (int i = 0; i < dt3.Rows.Count; i++)
{
    byte[] val = (byte[])dt3.Rows[i][2];
    MemoryStream ms = new MemoryStream(val);
 
    System.Drawing.Image newImage = System.Drawing.Image.FromStream(ms);

    newImage.Save(Server.MapPath("~/Images/temp/img" + i.ToString() + ".jpg"));
    dt3.Rows[i][1] = "Images/temp/img" + i.ToString() + ".jpg";

    // get thumbnail
    Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);
    Image myThumbnail = newImage.GetThumbnailImage(40, 40, myCallback, IntPtr.Zero);
    e.Graphics.DrawImage(myThumbnail, 150, 75);

    // save thumbnail
    myThumbnail .Save(Server.MapPath("~/Images/temp/thumb" + i.ToString() + ".jpg"));
}

Valery.

How to retrieve saved image as thumbnail from select query ?

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