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?
View 2 RepliesI 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.
View 4 RepliesFor 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.
View 2 RepliesI 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...
Code:
Imports Microsoft.VisualBasic
Imports System.IO
Imports System
Imports System.Xml
Imports System.Xml.Xsl
[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?
[Code]....
My requirement is when ever user upload an image and want to resize an image and then save that image into the database
View 7 RepliesI'm using JCrop, by using Mikes great article at: http://www.mikesdotnetting.com/Article/95/Upload-and-Crop-Images-with-jQuery-JCrop-and-ASP.NET
There are two things I haven't been able to figure out how to do though:
(1) How do I check if the uploaded image is big enough? (i.e. how do I determine width of image is > 200px")
(2) How do I resize the cropped image to 200px in width.
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 want to resize image on fly in my Product Datalist. I am retrieving image from folder but it includes images with diffrent size.
Some images looks clear but some pixelet. How to resolve this.
Datalist aspx code:
<asp:DataList ID="ItemList" runat="server" RepeatColumns="4"
BorderWidth="0px" BorderStyle="None" onitemcommand="ItemList_ItemCommand" >
<ItemTemplate>
<div class="sectionHolder">
<div class="pinStick">
[Code] ....
I have a 40x1600 image that I use for bg and I do repeat-x in my CSS, like such:
body
I'm getting back into coding after a seven year absence. Loving it, but everything is taking me so long!Anyway, I'm trying to upload a file from the browser and then read it into an XmlDocument object on the server. Originally I cracked this by saving the file to disk, reading it into the XmlDocument object and then deleting the file. The only problem was that the delete action was trying to take place before the XmlDocument.Load action had completed
View 2 RepliesI 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.
I use these code for resizing image
behind code
public string img_resize(string picname, int maxHeight, int maxWidth)
{
System.Drawing.Image currentImage = System.Drawing.Image.FromFile(server.mappath("mypics") + picname);
double imgHeight = 0;
double imgWidth = 0;
imgHeight = currentImage.Height;
imgWidth = currentImage.Width;
[code].....
but in this line occur error
<ItemTemplate> <%#img_resize(Eval("my_img"),100, 80)%> </ItemTemplate>
error: Parser Error
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.
what should i do ?
i am using fileupload asp.net controll so how i create image preview before image uploaded
View 6 RepliesI have update panel on the page to avoid postback and placed a dropdownlist control within that update panel. DrodownList is filled with Category names and also it's autopostback set to True.
Now whenever dropdownlist index change's on select, untill page loads complete data it should show mesage as "Loading.... in center and middle of the page and background should become bit transparent". And when page load completely with data then that background and message should get disappear.
i have developed my asp.net application along wih crystal report .... i need to show loading image on ever client and server side request .... (i.e) like when ever IE progress bar get loading i want to show my gif loading ... after IE progress bar finish its loading, my gif loading image should disappear .
View 2 RepliesI 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)
[Code] .....
i did this code to upload file and displaying it in the image:
[Code]....
the code works good. the file is uploaded under my website here in the solution explorer: now after uploading the file,the newly uploaded file is shown in the image(since there were a few more images present in the same location but they were not shown by the image) i used this url to the imageurl:
ResolveUrl("~")
which returns me this:
WebSite1
now my question is why the newly uploaded image is shown in the image? there were several other images present at the same location and even i have not used something in my code that tells to show only the newly added image from my website into the image.
I've got to following function which is called to change the resolution of an image. I want to do this so uploaded image with for example 300dpi will be modified to 72dpi (for web). This question is related to another question here on SO where i'm working on.
I'm creation an extension method for this to be able to use this function on more places in my application, instead of only when uploading new files. (See above mentioned question)
public static byte[] SetDpiTo72(this byte[] imageToFit, string mimeType, Size newSize)
{
using (MemoryStream memoryStream = new MemoryStream(), newMemoryStream = new MemoryStream())
{
memoryStream.Write(imageToFit, 0, imageToFit.Length);
[Code]....
I have code that is successfully uploading images to a folder on my website with the code below.. what I would need to do next to actually display that image on the same .aspx just after the actual upload?
Private
Sub btnUpload_Click(ByVal sender
As
Object, _ByVal e
As System.EventArgs)
Handles btnUpload.Click
Dim destDir
As
String = Server.MapPath("./images/Upload")
Dim fName
As
String = Path.GetFileName(uplPicture.PostedFile.FileName)
Dim destPath
As
String = Path.Combine(destDir, fName)True
lblUploadSuccessful.Text = "Upload succeeded."
End
Sub
m using asp.net 3.5 and c# on my website.Here is myquestion:I have an upload button and asp:Image on a page. An user can upload an image from his computer and that image will be displayed in the asp:image. But before I display the image, I would like to check the width and height of the uploaded image. How do I do this?
View 3 RepliesI've got an ASP.NET upload form on one page, where the user can upload an image. heres the code for that one:
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<html>
<head>
[Code].....
EDIT: By the way, the image uploads perfectly, it just won't show up on the next page.
I have the following code that is allowing me to save an image uploaded from a user into a root folder
HTML Code:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Dim fileName As String = Path.GetFileName(FileUploadUserProfile.PostedFile.FileName)
FileUploadUserProfile.PostedFile.SaveAs((Server.MapPath("~/ImageStorage/") + fileName))
Response.Redirect(Request.Url.AbsoluteUri)
End Sub
Question one: Once i upload the file and i click on the ImageStorage folder, i don't see an image, but if i exit the entire applicxation and then i go back in i am able to see the image. How can i refresh the folder wothout having to exit the application?
I am trying to display the image once is uploaded. i have the following to display the image:
HTML Code:
<img src="string url = ResolveUrl("~/ImageStorage/" + filename)" />
Occe the page is uploaded i don't see an image, instead i see a little square with a red X
Display Images from SQL Server Database using ASP.Net only display previous images only. new images are not visible
View 1 Repliesis this possible? I only need the width and height, so loading the image into ram would be unnecessary.
View 4 Replies