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aspx thread: Re: Image Upload and Resizing Question Answered
Message #1 by "Joshua Forman" <joshuajohn03@h...> on Wed, 25 Jul 2001 07:43:20
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Hey Scott,
I'm running into an error when I cut and paste your code:
Compiler Error Message: BC30311: A value of type 'Integer' cannot be
converted to 'System.IntPtr'.
in this line:
Line 25: resizedImage = uploadImage.GetThumbnailImage(width, height,
Nothing, 0)
So the error's somewhere in the function call cause I tried dimming
resizedImage just as an object and I got the same error. Any ideas? I
will _love_ this script if it works.
And btw, is there any way that us normal folks can access a portion of the
ASP.NET API? It's frustrating that there isn't a shred of documentation
online about a ton of these objects, etc.
Thanks!
Josh Forman
> Origional Question:
> -----------------------------------------
>
> I need to resize image which was just uploaded to the server. Image can
> be
> any format and I need to save it as JPG. I have been using ASPImage
> before.
> Is it possible to do this using .NET.
> Please Help
>
>
> ScottGu Answer:
> -----------------------------------
>
> Hi Tom,
>
> Its actually really easy to do this with .NET -- both the file upload
> part as well as the image resizing and save as JPG part. The below
> sample I've put together demonstrates how to do this (just copy/save it
> into a file called "ImageResizer.aspx" and hit it with a browser. It
> allows you to select an image on the client, upload it to the server,
> load it into an image object (without having to save it to disk), resize
> it, and then persist it to disk as a JPG.
>
> The file upload part of the solution is accomplished simply using the
> new file upload support within ASP.NET. The Image manipulation is done
> using the System.Drawing namespace -- which provides all of our graphic
> manipulation APIs.
>
> Hope this helps,
>
> Scott
>
> ------------------------------------------------------------------------
> ---------------
>
> <%@ Import Namespace=3D"System.Drawing" %>
> <%@ Import Namespace=3D"System.Drawing.Imaging" %>
>
> <html>
>
> <script language=3D"VB" runat=3Dserver>
>
> Sub UploadBtn_Click(Sender as Object, E as EventArgs)
>
> ' Obtain Image Object Reference from Uploaded Filestream
> Dim uploadImage as System.Drawing.Image
> uploadImage =3D
> System.Drawing.Image.FromStream(ImageUpload.PostedFile.InputStream)
>
> ' Calculate new Image Dimensions
> Dim width as Integer
> Dim height as Integer
>
> width =3D Integer.Parse(WidthTxt.Value)
> height =3D Integer.Parse(HeightTxt.Value)
>
> ' Obtain Resized Image Object From Uploaded Image
> Dim resizedImage as System.Drawing.Image
> resizedImage =3D uploadImage.GetThumbnailImage(width, height,
> Nothing, 0)
>
> ' Save Image to disk as a JPG
> resizedImage.Save(Server.MapPath("test.jpg"),
> ImageFormat.JPEG)
>
> ' Redirect browser to Image
> Response.Redirect("test.jpg")
>
> End Sub
>
> </script>
>
> <body>
>
> <form enctype=3D"multipart/form-data" runat=3Dserver>
>
> <h1>Welcome to ScottGu's Image Resizer</h1>
>
> Image to Upload: <input id=3D"ImageUpload" type=3D"file"
> runat=3Dserver>
>
> <br><br>
>
> New Horizontal Size: <input id=3D"WidthTxt" type=3D"text"
> value=3D"200" runat=3Dserver> <br>
> New Veritical Size: <input id=3D"HeightTxt" type=3D"text"
> value=3D"400" runat=3Dserver>
>
> <input text=3D"Upload and Resize" type=3D"submit"
> OnServerClick=3D"UploadBtn_Click" runat=3Dserver>
>
> </form>
>
> </body>
> </html>
Message #2 by Wim Hollebrandse <Wim.Hollebrandse@c...> on Wed, 25 Jul 2001 10:49:27 +0100
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Change the last argument in the GetThumbnailImage method from 0 into New
IntPtr() (a pointer to callback data), so the whole thing looks like this:
resizedImage = uploadImage.GetThumbnailImage(width, height, Nothing, New
IntPtr())
As for documentation, the .NET framework object reference etc., comes with
the complete .NET Framework (Beta 2) download. Online this can be accessed
at: http://msdn.microsoft.com/library/en-us/cpref/html/cpref_start.asp
Hope this helps,
Wim
-----Original Message-----
From: Joshua Forman [mailto:joshuajohn03@h...]
Sent: 25 July 2001 08:43
To: ASP+
Subject: [aspx] Re: Image Upload and Resizing Question Answered
Hey Scott,
I'm running into an error when I cut and paste your code:
Compiler Error Message: BC30311: A value of type 'Integer' cannot be
converted to 'System.IntPtr'.
in this line:
Line 25: resizedImage = uploadImage.GetThumbnailImage(width, height,
Nothing, 0)
So the error's somewhere in the function call cause I tried dimming
resizedImage just as an object and I got the same error. Any ideas? I
will _love_ this script if it works.
And btw, is there any way that us normal folks can access a portion of the
ASP.NET API? It's frustrating that there isn't a shred of documentation
online about a ton of these objects, etc.
Thanks!
Josh Forman
> Origional Question:
> -----------------------------------------
>
> I need to resize image which was just uploaded to the server. Image can
> be
> any format and I need to save it as JPG. I have been using ASPImage
> before.
> Is it possible to do this using .NET.
> Please Help
>
>
> ScottGu Answer:
> -----------------------------------
>
> Hi Tom,
>
> Its actually really easy to do this with .NET -- both the file upload
> part as well as the image resizing and save as JPG part. The below
> sample I've put together demonstrates how to do this (just copy/save it
> into a file called "ImageResizer.aspx" and hit it with a browser. It
> allows you to select an image on the client, upload it to the server,
> load it into an image object (without having to save it to disk), resize
> it, and then persist it to disk as a JPG.
>
> The file upload part of the solution is accomplished simply using the
> new file upload support within ASP.NET. The Image manipulation is done
> using the System.Drawing namespace -- which provides all of our graphic
> manipulation APIs.
>
> Hope this helps,
>
> Scott
>
> ------------------------------------------------------------------------
> ---------------
>
> <%@ Import Namespace=3D"System.Drawing" %>
> <%@ Import Namespace=3D"System.Drawing.Imaging" %>
>
> <html>
>
> <script language=3D"VB" runat=3Dserver>
>
> Sub UploadBtn_Click(Sender as Object, E as EventArgs)
>
> ' Obtain Image Object Reference from Uploaded Filestream
> Dim uploadImage as System.Drawing.Image
> uploadImage =3D
> System.Drawing.Image.FromStream(ImageUpload.PostedFile.InputStream)
>
> ' Calculate new Image Dimensions
> Dim width as Integer
> Dim height as Integer
>
> width =3D Integer.Parse(WidthTxt.Value)
> height =3D Integer.Parse(HeightTxt.Value)
>
> ' Obtain Resized Image Object From Uploaded Image
> Dim resizedImage as System.Drawing.Image
> resizedImage =3D uploadImage.GetThumbnailImage(width, height,
> Nothing, 0)
>
> ' Save Image to disk as a JPG
> resizedImage.Save(Server.MapPath("test.jpg"),
> ImageFormat.JPEG)
>
> ' Redirect browser to Image
> Response.Redirect("test.jpg")
>
> End Sub
>
> </script>
>
> <body>
>
> <form enctype=3D"multipart/form-data" runat=3Dserver>
>
> <h1>Welcome to ScottGu's Image Resizer</h1>
>
> Image to Upload: <input id=3D"ImageUpload" type=3D"file"
> runat=3Dserver>
>
> <br><br>
>
> New Horizontal Size: <input id=3D"WidthTxt" type=3D"text"
> value=3D"200" runat=3Dserver> <br>
> New Veritical Size: <input id=3D"HeightTxt" type=3D"text"
> value=3D"400" runat=3Dserver>
>
> <input text=3D"Upload and Resize" type=3D"submit"
> OnServerClick=3D"UploadBtn_Click" runat=3Dserver>
>
> </form>
>
> </body>
> </html>
Message #3 by "Tom Brzeski" <tom.brzeski@o...> on Wed, 25 Jul 2001 16:23:52
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In Beta 2 you need to do following.
Dim IntX As IntPtr = New IntPtr()
resizedImage = uploadImage.GetThumbnailImage(width, height, Nothing, IntX)
I hope this help
> Hey Scott,
>
> I'm running into an error when I cut and paste your code:
>
> Compiler Error Message: BC30311: A value of type 'Integer' cannot be
> converted to 'System.IntPtr'.
>
> in this line:
>
> Line 25: resizedImage = uploadImage.GetThumbnailImage(width, height,
> Nothing, 0)
>
> So the error's somewhere in the function call cause I tried dimming
> resizedImage just as an object and I got the same error. Any ideas? I
> will _love_ this script if it works.
>
> And btw, is there any way that us normal folks can access a portion of
the
> ASP.NET API? It's frustrating that there isn't a shred of documentation
> online about a ton of these objects, etc.
>
> Thanks!
>
> Josh Forman
>
>
>
> > Origional Question:
> > -----------------------------------------
> >
> > I need to resize image which was just uploaded to the server. Image can
> > be
> > any format and I need to save it as JPG. I have been using ASPImage
> > before.
> > Is it possible to do this using .NET.
> > Please Help
> >
> >
> > ScottGu Answer:
> > -----------------------------------
> >
> > Hi Tom,
> >
> > Its actually really easy to do this with .NET -- both the file upload
> > part as well as the image resizing and save as JPG part. The below
> > sample I've put together demonstrates how to do this (just copy/save it
> > into a file called "ImageResizer.aspx" and hit it with a browser. It
> > allows you to select an image on the client, upload it to the server,
> > load it into an image object (without having to save it to disk),
resize
> > it, and then persist it to disk as a JPG.
> >
> > The file upload part of the solution is accomplished simply using the
> > new file upload support within ASP.NET. The Image manipulation is done
> > using the System.Drawing namespace -- which provides all of our graphic
> > manipulation APIs.
> >
> > Hope this helps,
> >
> > Scott
> >
> > -----------------------------------------------------------------------
-
> > ---------------
> >
> > <%@ Import Namespace=3D"System.Drawing" %>
> > <%@ Import Namespace=3D"System.Drawing.Imaging" %>
> >
> > <html>
> >
> > <script language=3D"VB" runat=3Dserver>
> >
> > Sub UploadBtn_Click(Sender as Object, E as EventArgs)
> >
> > ' Obtain Image Object Reference from Uploaded Filestream
> > Dim uploadImage as System.Drawing.Image
> > uploadImage =3D
> > System.Drawing.Image.FromStream(ImageUpload.PostedFile.InputStream)
> >
> > ' Calculate new Image Dimensions
> > Dim width as Integer
> > Dim height as Integer
> >
> > width =3D Integer.Parse(WidthTxt.Value)
> > height =3D Integer.Parse(HeightTxt.Value)
> >
> > ' Obtain Resized Image Object From Uploaded Image
> > Dim resizedImage as System.Drawing.Image
> > resizedImage =3D uploadImage.GetThumbnailImage(width,
height,
> > Nothing, 0)
> >
> > ' Save Image to disk as a JPG
> > resizedImage.Save(Server.MapPath("test.jpg"),
> > ImageFormat.JPEG)
> >
> > ' Redirect browser to Image
> > Response.Redirect("test.jpg")
> >
> > End Sub
> >
> > </script>
> >
> > <body>
> >
> > <form enctype=3D"multipart/form-data" runat=3Dserver>
> >
> > <h1>Welcome to ScottGu's Image Resizer</h1>
> >
> > Image to Upload: <input id=3D"ImageUpload" type=3D"file"
> > runat=3Dserver>
> >
> > <br><br>
> >
> > New Horizontal Size: <input id=3D"WidthTxt" type=3D"text"
> > value=3D"200" runat=3Dserver> <br>
> > New Veritical Size: <input id=3D"HeightTxt" type=3D"text"
> > value=3D"400" runat=3Dserver>
> >
> > <input text=3D"Upload and Resize" type=3D"submit"
> > OnServerClick=3D"UploadBtn_Click" runat=3Dserver>
> >
> > </form>
> >
> > </body>
> > </html>
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