Web Forms :: Checking For And Resizing An Image Before Downloading With VB.net?
Jul 17, 2010
In trying to upload images to a server, I often get the following error "Maximum request length exceeded.".
I have tried to check for the size in codebehind but it appears that the error comes from the service provider or something else because I never even get to debug it since the error appears even before the Page_Init Subroutine in codebehind.
What is the best method of checking for the image size and then resizing it dymamically to a maximum file size as well as length and width size.
I am developing an ASP.NET 3.5 web application in which I am allowing my users to upload either jpeg,gif,bmp or png images. If the uploaded image dimensions are greater then 103 x 32 the I want to resize the uploaded image to 103 x 32. I have read some blog posts and articles, and have also tried some of the code samples but nothing seems to work right.
I have a photo on my server image1.jpg in high resolution, and I need it to be resized everytime it is send to client depending with dimension I put but should not make extra file on disk.
I used aspjpeg for this in past but now I need something that can be used on servers that do not have aspjpeg instaled.
For simplicity lets say that I have a web page that needs to display thumbnails of images. The images locations are stored in a database(the images are stored on Amazon S3). Is it possible to have my web server scale down the large image before it is delivered to the client? This way I don't have to store thumbnails of every image and the client can download a smaller file.
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: The server tag is not well formed.
I have uploaded a .jpg image and resized as Small and Large thumbnail. The small image is (135 X 173) but after resizing the small thumbnail image file size is of 40.8 KB. And mostly all images (around 64) thumbnails having file size more than 40 KB. Due to which thumbnails taking lot of time to get display.
Is there a way through which we can reduce the image file size upto 8 to 12 kb, but without effecting image quaity??
Below is the source code that i am using for resizing an image:
If FileUpload1.HasFile Then Dim stream As Stream = FileUpload1.PostedFile.InputStream Dim x As String = IO.Path.GetExtension(FileUpload1.FileName).ToLower If x = ".jpg" Or x = ".jpeg" Then Dim image As New Bitmap(stream)
I found some code that resizes an uploaded image ( stream ) to a pre-determined size. Using this code, it works perfectly..
Code: ' make sure we have a file . If FileUpload3.HasFile Then Dim name As String = FileUpload3.PostedFile.FileName Dim Justname As String = Path.GetFileName(name) Dim length As Integer = FileUpload3.PostedFile.ContentLength
[Code] ....
What I'd like to do is move this code into a Class so I can call it from other pages, so I created a class and added this code...
As you can see, I'm trying to pass in a stream and defined width, and I want it to pass back the image ( if the size if greater than what I expected.
I'm trying to call the class like so.
Code: ' make sure we have a file and that we have an ID to set it to. If FileUpload3.HasFile Then Dim name As String = FileUpload3.PostedFile.FileName Dim Justname As String = Path.GetFileName(name) Dim length As Integer = FileUpload3.PostedFile.ContentLength
[Code] ....
Don't worry about the cc.imgStr this is just the path to my class which is defined futher up.
The Error I get is "Value of type system.io.stream, cannot be converted to ' 1 dimensional array of byte' "...
I have a script which resizes images, I did not write this script, nor do I know any ASP.NET, but I have been assigned the task of fixing an issue with it!
The problem is, the resulting image from the resize appears to be of less quality than the upload, even if the file uploaded is already set to the correct size.
Uploaded image - [URL] Resized image - [URL]
The script that is doing the resizing is as follows, how to correct the issue?
I have ASP.NET form with an upload control for users to post an image. On the server I load that image (using the Bitmap class) and resize it. Is there any danger in doing that when users upload malicious or affected files or will the code just throw an exception at some point and stop the whole process?
when i will click on the a.jpg that is an image, i will open a dialoguebox having yes & no, when i click on the yes, the image should be downloaded in my harddisk, and when i click on No, It will not perform any action
i use generic handler to store an image. When i use in my webpage to retrieve image from handler and download into PDF, it shows an error msg as "Illegal characters in path."
using vb.net 2005.I am reading an image using a FileStream object and wondering this: is there a way that I can check what the dimensions are of a file before I read it using the FileStream object? the code I have now is like this:
I am using if (document.getElementById('<%= MainImg.ClientID %>').complete) { hideLoadDiv(); }
to hide a div which indicates the image is not loaded yet,but it hides before the image has finished loading and is shown, while the browser is giving me a message that the page is still transferring data from the server :S
Is there another function I can use to make sure that the image is fully loaded?
I have an application with a FileUpload control. The code behind saves the uploaded file (which I've stipulated in the code must have a ".jpeg" extension) to the webserver's hard disk. Details about the image, such as its ID, Title, Description and Upload date are saved in an MS SQL Server database. Nothing difficult here.
What I'd like to do instead... is take the uploaded image (which will be a "large", high-quality image), save this as above but ALSO dynamically resize and resample a copy of this image and store a thumbnail of it on the webserver hard drive as well.
I can't find a post which explains how to do this in this forum group. Can anyone point me in the right direction for an answer. I am using Visual Studio 2008, ASP.NET 3.5 and Visual Basic.NET 2008.
I'm having a little problem with textboxes automatically resizing after postback.
I have a textbox on set with a width of 90%.
Now the text box works fine but if I have something in the textbox that is longer than what it can display, when I save and the page reloads with the string in there the textbox automatically makes itself larger and becomes bigger than the 90% that I set and goes off the page, a scroll bar appears.
Is there a way to turn this off? I have been searching and can't seem to find anything..
I realize that if I set it to a fixed with this problem goes away if I set a fixed width but I need it at 90%.
Also, I have some multi-line textboxes and they have the same issue, even though it's multi-line, it still becomes a little bigger wrap less times than it can.
As the first step, I designed a Master Page for my website. Everything seems to be in order. My master page has a table say "Mytable" with 2 rows.
In the first row, I've put up a banner for the website.
In the second row, I want to place the ContentPlaceHolder.
The thing is that I can't make the ContentPlaceHolder to occupy the whole cell. I tried finding the solution through search engines and could not find out a solution.
In my web page, I want to create a table by Javascript. I mean that I want to make this table to occupy the second row of "Mytable". There is still some gaps left at the top and bottom of the ContentPlaceHolder.
how to disable the resizing of a multiline textbox control. I'm trying to use the textarea to display rules for a contest, however I dont want them to be able to change the size of it by dragging it around from the bottom right corner.
dynamically resize a user control depending on the container it is currently in,or the other way around.and be able to resize a container based on the user controls size.Let me explain.Right now I have a page using the Ajax TabContainer and within one of the tabs I have my user control.My user control accepts a DataSet and simply lists the results in a GridView.
Right now when you go to the tab everything displays fine, except the results go all the way to the bottom of the page.What I would like to do,is to either resize the TabPanel to match the amount of data,or have a fixed height/width for the user control and make it scrollable.This user control can be on a number of different pages with different sized containers,so I am at a standstill.Has anyone done anything like this before or have an idea how it could be accomplished?
I need to take an uploaded image, resize it, and save it to the database. Simple enough, except I don't have access to save any temp files to the server. I'm taking the image, resizing it as a Bitmap, and need to save it to a database field as the original image type (JPG for example). How can I get the FileBytes() like this, so I can save it to the database?Before I was using ImageUpload.FileBytes() but now that I'm resizing I'm dealing with Images and Bitmaps instead of FileUploads and can't seem find anything that will give me the bytes.
I am using a resizable() event and I want to bound the max height and max width within another div element. Containment option does not work. So, I used the resize event. I am able to trap the condition where the resize goes beyond the container, but not able to stop the resize.
