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?
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How to upload images with some conditions
Like
size not gretr than 50 kb
with = 110px, height 140 px
etc..
I need to know, how to add a validator in Ajax AsynFileUploader which will validate the image dimensions.
View 8 RepliesI use fileupload control to upload image below is code:
protected void BtnUpload3Img_Click(object sender, EventArgs e)
{
uploadImageError.Visible = true;
if (fup3.HasFile && fup3.PostedFile.ContentLength < 102400)
[Code]....
in above code I define format of image that user can upload .png or .jpg image and size of image should be lessthan 100KB now I want define that users just can upload images with dimension 1007*143 how I can do it?
I want to show image with size.when the cursor will hover to image it will show size like google image.
View 1 RepliesGiven a URL to an image (and not the image itself), what's the most efficient of getting it's dimensions? I would like to change the height and width attributes in the image tag (<img>) if it is greater than 200x200. However, if it's smaller than that, then I'd like to keep the size as it is. (I'm using ASP.NET/C#)
View 4 Repliesusing 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:
[Code]....
Im getting some images from a webpage at a specified url, i want to get their heights and widths. I'm using something like this:
Stream str = null;
HttpWebRequest wReq = (HttpWebRequest)WebRequest.Create(ImageUrl);
HttpWebResponse wRes = (HttpWebResponse)(wReq).GetResponse();
str = wRes.GetResponseStream();
var imageOrig = System.Drawing.Image.FromStream(str);
int height = imageOrig.Height;
int width = imageOrig.Width;
My main concern with this is that that the image file may actually be very large,Is there anything I can do? ie specify to only get images if they are less than 1mb?or is there a better alternative approach to getting the dimension of an image from a webpage?
I have file upload UI element in which the user will upload images. Here I have to validate the height and width of the image in client side. Is it possible to find the size of the image having only the file path in JS?Note: If No, is there any other way to find the dimensions in Client side?
View 4 RepliesI have many image in my page my images size are between 100 -200kb I want redeuce my images size to 4-5Kb ... How I can do it? is there any control to do it?
View 1 Repliesi am using fileupload asp.net controll so how i create image preview before image uploaded
View 6 Repliesi 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 have a web site where i can upload videos. Here i have a requirement that while uploading i should validate that user should not upload video with more than 1 minute duration.
So i doubts how we can implement this validation.
I should upload only the PDF files.How to validate?...
View 11 Repliesi have a file upload control in my form.
How do i check if the user has chosen a file to be uploaded or not.
At present the selected file uploads however if no file is selected the script crashes...
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
I'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 RepliesI am working my way through image upload tutorial and have a question. Is it possible to preview an image that is being uploaded without using javascript and using only razor and html? If so,
View 2 RepliesHow would I go about having a thumbnail preview of an image that has been uploaded through AsyncFileUpload?
View 2 RepliesDoes anyone know how to display the uploaded image onto the webpage after the image has been uploaded via the asyncfileupload control?
I tried setting the value of an imageurl property of an image control within the OnUploadComplete event however it seems the code 1st refreshes the page, runs through the Page_Load event, then finally the OnUploadComplete, so I'm assuming since it's run last, this is why it doesn't display the imageurl.
I have an asyncfileupload control. AFTER the file has been successfully saved to disk I want to assign the uploaded image to a HTML element. To show it to the user.
Important: in the afuFlyer_UploadedComplete method I'm renaming the image, so the image saved to disk does NOT have the same name as the file the user initially uploaded.
I have this:
<cc1:AsyncFileUpload ID="afuFlyer" OnClientUploadComplete="Async_UploadComplete" OnUploadedComplete="afuFlyer_UploadedComplete" UploaderStyle="Modern" runat="server" />
and a javascript function:
function Async_UploadComplete(sender, args) {
var filename = args.get_fileName();
var contentType = args.get_contentType();
var text = "Size of " + filename + " is " + args.get_length() + " bytes";
document.getElementById('lblStatus').innerText = text;
}
But the args.get_fileName(); is useless since the filename has been changed. So I need to pass the new filename to this method somehow?
Also, is the image actually already saved to disk when the Async_UploadComplete function is called? Or has the upload to the server just been completed and not the saving to server disk?
Ive also tried working with ScriptManager.RegisterClientScriptBlock and ScriptManager.RegisterStartupScript in afuFlyer_UploadedComplete method without success:
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?
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