Asp.net - Return Re-sized Image From Database Through .ashx
Aug 8, 2011
I'm looking to return a thumbnail image from a full size image stored as varbinary(max) in the database. I'll be using the thumbnails in a gallery-style view, so small size / efficient loading is crucial. I've been using an .ashx to return the full size image into a bound asp.net Image control, with the following code:
Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim conn As New SqlConnection()
[Code]....
I realize it's probably best to address the re-size at the upload, and stored the smaller image as a discrete column. But in the meantime, is it possible to program the handler to re-size the image on the fly? Ideally, I'd be able to pass an additional query string parameter, something like isResized from the image binding, allowing the same handler to be used for both full size and re-sized images.
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Mar 2, 2012
I have a vb.net web handler which builds two strings The strings basically looks like this:
["filename", "filepath"],["filename", filepath"],...,["filename", filepath"]
I need to return it in a way that the strings are sent with the name of the list, followed by the list
["listname": {["filename", "filepath"],["filename", filepath"],...,["filename", filepath"]}
I know that the web handler will automatically json encode the data, and that the way I have built my list should be reworked (the way we previously used this it was exactly what we needed).What might be a better way for me to house my data and return it to the browser in a way that is understood correctly?
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Jun 22, 2010
I am working on a personal vb.net project that will allow me to capture a full-sized image of a given web page. I've been working on this for a few of days and have not found a method that is 100% reliable. Here's what i have tried so far...
METHOD #1 - Using WebBrowser Control and CopyFromScreen
Problem: Fails to capture the entire content of the page if part of it is off screen, obscured, or requires scrolling.
[code].....
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Aug 11, 2011
<asp:TemplateField
HeaderText="Image">
<ItemTemplate>
[CODE]...
When i run my form then it will show this.......and using vb.net. onversion from string "Handler.ashx?ID=" to type 'Double' is not valid.
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Feb 20, 2012
I am having trouble getting my .ASPX page to call my .ASHX file. Does anyone know what I might be leaving out? I have posted my entire .ASHX file below along with a little .aspx.
Imports System.Web
Imports System.Web.Services
Imports System.Data.SqlClient
[Code]....
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Mar 14, 2011
i am creating a httpRequest handler to download files my question is which better to use aspx or ashx ?
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Jan 11, 2012
This question is a following from another question I asked - Passing client data to server to create Excel or CSV File. I have a client page which builds a JSON object to send to the server, and I have server code which can parse that JSON object into an SQL command and end up with a dataset of required data.
I had originally been passing the JSON object to an .asmx web service which would return a JSON object containing my data. Now I want to go in a different direction and have the data returned as a .csv file.
I understand I can try to put my JSON object into a query string and call my .ashx page, but the JSON object could get large, so I'm trying to use the Request.Form of a POST.
My question, and lack of understanding, is in how to use jQuery to post to the .ashx page and have it return the .csv file to the client. If I navigate to the .ashx page directly (and modify the page to hard code the passed data), I get the .csv file returned to me no problem (i.e I get the prompt to open/save the file). If I make a POST to the .ashx file from jQuery and send my JSON object through, I get a response which contains the data in a string, rather than getting a .csv.
So, is there something I am missing, or am I just trying to achieve something that I can't or shouldn't be doing? I'd thought about passing my JSON object to a .asmx web service which would store the JSON object into a database and return an ID, and then use window.location to browse to the .ashx with the ID as a query string parameter to then generate the .csv file, but I thought there might be a way to avoid that middle step and do it with the POST.
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Feb 24, 2009
I need to get a value from an API I made with ASHX and normally it is called from javascript but I need to call it right in ASP.NET I figured this shouldn't be a problem but I'm not sure the syntax.
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Jan 31, 2012
I have a context.Request.QueryString item that is returning the wrong value in the ProcessRequest method of a .ashx handler.
The code is like so:
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim strOrderItems As String = Convert.ToString(context.Request.QueryString("OrderItems"))
End Sub
One of the values returned by "OrderItems" is wrong. How can I find out what process has called this method to fix the incorrect data?
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Nov 23, 2010
I need to return the name of an image that is in a pictutrebox in VB.NET 2008.
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Jan 7, 2009
I have a list of images in the resource file of a VB project and a particular picture box on my form gets populated with an image depending on certain conditions: picNotify.Image = My.Resources.[ImageName]
Later on in my program I want to query the name of the image in the picturebox. Technically I could create a variable and pass the name of the image in the same piece of code above but I dont like creating unnecessary variables if I am able to extract the information via code.
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Jan 23, 2012
What values do I use for a Legal sized bondpaper? PrintDocument1.DefaultPageSettings.PaperSize
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Oct 22, 2009
Several years ago I developed a VB.Net 2003 WinForm application using SQL and the DataGrid control. The Datagrid is bound to a SQL dataset in the form load event. Everything work fine.
With the form opened, the user has the ability to size the datagrid control's column width and row height. I want to be able to capture the new row height as sized by the use?
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Apr 3, 2009
I have a situation where I have several listbox controls on the same asp.net page. They are currently autosized to keep data from truncating. However, I would like to be able to determine the width of the largest listbox and then alter the size of the other listboxes to be the same.
How can I access the size of the listboxes?
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May 11, 2009
I have a request for a util to create a binary file of finite size. For example, the user might want to create a 10KB or 1GB or 400GB file for testing network transfers. I would also like the ability to create multiple files, for example, create 10x 10KB or 5x 1GB or 2x 400GB (so my user would enter qty=5 and size=1GB and have 5x 1GB files in a specific folder).
[code]...
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May 26, 2011
I am using VS2010 VB.net and I am having issues with what would normally apear to be straight forward in VB6... I am looking at a control that will alternate its backgroundimage between two images, I wish to check which image is currently loaded to the control and change it to the alternative image.
If A1RectangleShape.BackgroundImage = my.resource.Image1 then
A1RectangleShape.BackgroundImage = my.resource.Image2
else[code]....
This only yields the type of image thats assigned to the control "System.Drawing.Bitmap" how to return the backgroundimage file name thats been assigned to the control at runtime, IE Image1 or Image2.
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Apr 25, 2012
I have coded very simple asp pages to return an image when requested. But I need to do this from a vb.net application. So I assume I need to create a mini http web server. I have code for some that does not support asp or anything like that. Is there another method to return an image? Anyone have an example of this? Or again, do I need to find a web server control or app to use?
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Jan 20, 2012
I am new to WPF but what i am trying to to do is i have a parentGrid with 3 rows, the first two are a menu strip and a toolbar, the third row is a child grid that is populated with the choices that are selected from the tool bar. the problem is that i want the forms that load in the child grid to not have their height surpass what i have set that row equal to in the parentGrid.[code]
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Jan 20, 2012
I dont know if this has been answered but what i am trying to to do is i have a parentGrid with 3 rows, the first two are a menu strip and a toolbar, the third row is a child grid that is populated with the choices that are selected from the tool bar. the problem is that i want the forms that load in the child grid to not have their height surpass what i have set that row equal to in the parentGrid.is there an effective way to do this?
here is basically what i have for code
<Grid x:Name="ParentGrid" Margin="0" >
<Grid.RowDefinitions>
[code]....
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Mar 3, 2011
What i am doing is inserting the first element in array3 into the first index of array4
then im checking second index of array3 and if this is the same as the 1st array then dont insert into array4 as this will be a duplicate.[code]...
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Aug 27, 2010
How could one create a form that would give a handle to direct the mouse at that when the mouse clicked would result in focus of external process form directly bollow layer thereby giving focus to text box on said form?
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Jan 6, 2010
I have previously used the arguments of a contentsResized event on a Winforms richtextbox to get the new size of my RTB. I am now developing a WinForms app with a custom WPF RichTextBox. My whole reason for doing this is to use the out-of-the-box spellchecker. I need my RichTextBox to expand and collapse vertically as the text is changed. The elementhost will also have to resize to allow the whole RTB to display on-screen.
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Sep 25, 2009
How can i draw a random sized + shaped triangle, centered in my picturebox?
heres the code i wrote, but it draws them too big + off the screen or too small. how can i draw medium sized triangles centred in my picturebox?[code]...
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Oct 29, 2011
Out of Memory displaying Thumbnails in Windows 7 64-Bit with 12GB installed
See more: .NET4
'My VB Code:
Private Sub Thumb()
Dim img As Image
[Code]...
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Aug 28, 2010
i want to save image in ms access 2000 database & i want retrive it in a crystal report in vb.net 2005
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Sep 3, 2011
How to retrieve a binary image from a database using vb.net and insert the image into a GridView.
This is my DB
image (id as integer , img as varbinary(max))
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Jan 17, 2010
I hoping to find a current and simple way to do this. I'm using VWD Express 2008 and SQL Express 2008.I'm able to get the client's path to the image file using an asp:FileUpload control on the web form.
How do I upload the client's image file and display it in the web form's image control?How do I save it to the sqlserver? The image table is already set up with a "Image" data type column. Can the image be saved to the database as simply as other data types?
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Sep 24, 2008
how I could search a given bitmap, say "test.bmp" or a printscreen, for two pixels that are next to each other and that have specified color values? The colors are: &H486596 and &H213D66. I then want to return the pixel positions in the image at which they are first located adjacent to one another. I'm only after the first instance of the occurrence. I wish to use GetDIBits as I hear that it's quicker. So I want to find the first instance where the color value for pixel (x,y) = &H486596 and (x+1, y) = &H213D66.
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Jan 17, 2012
I am working on a project related to saving an image captured from a scannner in a folder and in the database. The scan performs ok but when I save the image on disk and the path in the database I get the following error
[Code]...
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Aug 21, 2009
1) Add a new record - I can currently add records text to access database, but not images.
2) Get the ID [URL]I'm not sure how to integrate this code into my code. I am stuck here.
3) Save the image in the filesystem using the ID as a filename - I can save the upload an image and save the image to a directory on my computer, but I am unable to name the image that of the ID of the access database.
4) Update the database to put the filename in the record you just created. - I am unable to do this as well (obviously).
Protected Sub SUBMIT_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SUBMIT.Click
Dim custDb As Data.OleDb.OleDbConnection
Dim cmdInsertCustomers As Data.OleDb.OleDbCommand
[code]....
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