I got a variable of type System.Drawing.Image and need to convert it to a variable of type byte so I can store the image in the database. Can someone show me how to do that in VB.NET code.
View 2 Repliesif (Session["image"] != null)
{
ImageButton1.ImageUrl = "~/IMAGE/pic.jpg?" + DateTime.Now.Ticks.ToString();
}
The session key image is from another aspx page
{
string strPhoto = Request.Form["imageData"]; //Get the image from flash file
byte[] photo = Convert.FromBase64String(strPhoto);
FileStream fs = new FileStream(Server.MapPath("~/IMAGE/pic.jpg"), FileMode.OpenOrCreate,
[Code]....
The issue is
Operand type clash: nvarchar is incompatible with image.
I use to store image in bytes and able to convert it to system.drawing.image but not sure how to render it on page
View 2 RepliesI am importing data from Excel sheet to a database. The table in the database has a special column where I store Interior.ColorIndex of each row in Excel. Then I display the data in a GridView. I need its rows to have the same or close colors as corresponding rows in Excel. I cannot find how to convert the color information I store in my database into System.Drawing.Color (in other words, to RGB) to apply to my GridView.
View 2 RepliesUsing C# I was trying to develop the following two. The way I am doing it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same.
private static String HexConverter(System.Drawing.Color c)
{
String rtn = String.Empty;
try
{
rtn = "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
}
catch (Exception ex)
{
//doing nothing
}
return rtn;
}
private static String RGBConverter(System.Drawing.Color c)
{
String rtn = String.Empty;
try
{
rtn = "RGB(" + c.R.ToString() + "," + c.G.ToString() + "," + c.B.ToString() + ")";
}
catch (Exception ex)
{
//doing nothing
}
return rtn;
}
Not sure if this is the correct section to ask this but this is regarding storing datatype problem.im trying to convert an image file retrieve from a folder and convert it to Byte so that i can save into database
In below function i retrieve and convert the image from a folder to byte
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Then i set ImageUrl in PageLoad
[Code]....
My image datatype in database is image
I have a byteArray which I can only convert into an Image (Drawing.Image) I was wondering how I can display it a webpage. I used memoryStream as I dont want to user to have to download the image. Eventually I will use this to display images in google maps.. I can convert it into a graphic but once again not sure what I will do with it. The Error I have been getting lately is Cannot implicitly convert type 'System.Drawing.Image' to 'System.Web.UI.WebControls.ImageField'
[Code]....
I return array of images ( System.Drawing.Image[] ) from database and i want to show them in datagrid or datalist .. how to do that ?
View 2 Repliesi got an image display in my system, note that it is not an uploaded file, it is display in <asp:Image> form
My question is, how do i use that image and convert it to a byte data so that i can save into database?
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.
How to add System.Drawing.Image object to Asp:Image Control but I dint have imageId in my table.Image field is in another table..i retrieve image from database in Image object.i want to display it in asp:Image control or grid view.how to do it?
View 1 RepliesI created image from byte array
System.Drawing.Image newImage;
using (MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
{
ms.Write(imageBytes, 0, imageBytes.Length);
newImage = System.Drawing.Image.FromStream(ms, true);
}
and now I need to have this image as a source for asp:Image (System.Web.UI.WebControls.Image). Is this possible as I know that conversion is impossible?
I am developing an application that stores images as Base64 strings in xml files. I also want to allow the user to crop the image before saving it to the file, preferably all in memory without having to save a temp file, and then delete it afterwards. In order to display the newly uploaded image, I need to create a HTTP handler that I can bind the asp:Image to. The only examples for doing this online require passing the .ashx an ID and then pulling the image from a DB or other data store. Is it possible to somehow pass the raw data to the .ashx in order to get back the image?
View 3 RepliesI want to write a unit tetsing code for this function
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I'd like to cretae a stub for image As System.Drawing.Image, set expectation as image.Width=250, image.Height=200. Can anyone help me on how to create the image stub in Rhino Mocks?[Code]....
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I need to convert a string to http url.The way i have to do this is--I have to retriew a value from database and convert it into a sharable http url in Asp.net C#.
View 9 RepliesI have a column in a table within my SQL database that is specified as a time variable. Not DateTime or Date, but just Time. So, I need to know how to convert a text string into the format that would be accepted for entry in the Time column of a table in SQL. I know how to convert dates, but not time.
View 4 RepliesI have a task to send mail for updated values my code is below i cant able to set proper format for that
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I am develping an application that integrates with an RFID kit. The problem is, the kit comes with an .cs class that accepts data stored in a byte array however, each information stored in the array respresents an int. I wanted to store String information in each array but, my research suggest that a String itself can be converted to a byte array and not a byte....here the code from the .cs class:
byte BlockNo = 0;
byte[] BlockData = new byte[16];
byte ReturnCode = 0;
[code]....
Each t_b*.text respresents an int. Is there a way I can stored a String in a single byte block?
I have a DropDownList with a list of value.
I need in my code USE the value selected by the User in the DropDownList AS INT DataType (numeric).
At the moment I am using this code below (CONVERTING DATATYOES).
Script work just fine.
But I would like to know if exists an alternative way to do it.
[code]....
can we grab a global variable or Session or View State variable in the javascript or using jquery?
I have a web application which uses a session variable to store the logged in userid. If no user is logged in, of course this variable will be empty and the contents displayed on my website are meant for guests. If there is a user logged in, the user specific controls/access/links will then be a displayed.
I am now having issues with my hosting where on shared application pool, the worker recycle is triggered every 90 minutes, this will clear sessions causing all my users to be logged out. I opted for a dedicated application pool, which got worse because I am only allocated 50MB memory limit and if this is reached, the worker recycle is triggered and I lose my sessions again. I have tried as much as possible optimization techniques, e.g. dispose where possible, close connections, disable viewstate for static controls etc but my memory per instance keeps building up from page to page without any signs of improvement. I don't use loops nor store huge objects like bitmaps etc but my sessions are now gone even faster than 90 minutes in shared application pool before.
I have considered using SQL Session State but there isn't a simple guide on using this with MySQL. I am getting desperate and considering using a public variable, a string as a replacement to store logged in user id instead of in a session variable. I am pretty sure this will solve my issue with sessions being recycled but are there any negative consequences of doing this? One problem I can think of is if the user closes the browser, the system will never know that the user is now logged out and this public variable should be nothing. In this scenario, will the GC eventually clear this abandoned public variable.
I'm evaluating two options of accessing a server side data on client side. Little bit confused about the efficiency or may be you can call it as finding best approach to do it.
I need to access a server side data may be an integer value in javascript on client side. I know about two options to do it.Create a public variable or property on server side and set it to javascript variable on client side as below:
var value = eval(<% =value %>);
Create a asp hidden variable and set value in this hidden variable from server side and access it through javascript using document.getElementById().
Which is the best approach and what are the pros and cons?
Possible Duplicate: Use of var keyword in C# Hi, I am pretty new in C#,I would like to know the best practices in declaring variables.I know it is possible to use VAR (explicit declaration) or the DataType when declaring a variable (implicit).
View 3 RepliesI'm am not quite sure why I am getting this error.
Dim numUsers as Integer
Using myConnection as New System.Data.SqlClient.SqlConnection("Data Source=(local);InitialCatalog=dbtest;Integrated Security=True")
Dim queryString As String = "SELECT COUNT(*) AS Num_Of_User FROM tblusers WHERE username=@username AND password=@password"
Using myCommand as New System.Data.SqlClient.SqlCommand(queryString, myConnection)
myConnection.Open
myCommand.Parameters.AddWithValue("@username", requestName)
myCommand.Parameters.AddWithValue("@password", requestPass)
numUsers = myCommand.ExecuteScalar()
End Using
End Using
This error occurs on the first using statment.
I've got a variable that holds html for the body text in a cms I'm working on. I want to extract all image src tags from the variable so I can display these images.
View 2 Replies