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Image manipulation
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Mattblack View Drop Down
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Joined: 21 January 2003
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Points: 139 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mattblack Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2004 at 11:17am

brilliant!  You're a genious!!!  :-)

Thank you.
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Mattblack View Drop Down
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Points: 139 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mattblack Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2004 at 11:19am
even makes it a smaller file size!  Im well chuffed now
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jchonparadise View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jchonparadise Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2006 at 10:26pm
I realize this is a really old thread, but I just came upon it.
 
I get the following error when i implement the code:
 

Parameter is not valid.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Parameter is not valid.

Source Error: 

Line 6:  Response.ContentType = "Image/Jpeg"
Line 7:  
Line 8:  Dim SourceImage As New Bitmap(Server.MapPath(Request.QueryString("source")))
Line 9:  
Line 10: Dim NewWidth As Integer = SourceImage.Width
 
Stack Trace: 

[ArgumentException: Parameter is not valid.]
   System.Drawing.Bitmap..ctor(String filename) +375381
   ASP.thumbnail_aspx.Page_Load() in [REMOVED because I'm paranoid]\thumbnail.aspx:8
   System.Web.Util.CalliHelper.ArglessFunctionCaller(IntPtr fp, Object o) +5
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +781855
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

Help?


Edited by jchonparadise - 21 June 2006 at 10:34pm
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Mart View Drop Down
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Points: 2304 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mart Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2006 at 7:04pm
Can you post the entire source to thumbnail.aspx, including any modifications?
As far as i can tell the original code that i posted should work fine, also what parameters are you providing the page with?
You have to remember that the source parameter should be a virtual path starting from the directory that the script is in, it's then translated to a physical path.
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jchonparadise View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jchonparadise Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2006 at 7:14pm
Thanks for the help - here's the source (nothing was changed from what you posted):

<%@ Page Language="vb" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<script runat="server">
Public Sub Page_Load
Response.ContentType = "Image/Jpeg"
Dim SourceImage As New Bitmap(Server.MapPath(Request.QueryString("source")))
Dim NewWidth As Integer = SourceImage.Width
Dim NewHeight As Integer = SourceImage.Height
Do Until NewWidth < 100 And NewHeight < 100
NewWidth = NewWidth / 2
NewHeight = NewHeight / 2
Loop
Dim Thumbnail As Bitmap = SourceImage.GetThumbnailImage(NewWidth, NewHeight, Nothing, IntPtr.Zero)
Thumbnail.Save(Response.OutputStream, ImageFormat.Jpeg)
Thumbnail.Dispose()
SourceImage.Dispose()
End Sub
</script>
 
And I did point the source to the virtual path (similar to your example: thumbnail.aspx?source=images/test.jpg)


Edited by jchonparadise - 26 June 2006 at 9:51pm
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