Web Forms :: Display System.Drawing.Bitmap Object On Page?
May 14, 2010
I am trying to built a WebForm with module where the user can see himself in his webcam. I am using AForge.NET framework to control the webcam.
AForge returns every frame as Bitmap object (System.Drawing.Bitmap) and now i have to display it in my WebForm. In the Windows form I would achieve it by assigning Bitmap to the PictureBox control but how do i do it in WebForm? There is only Image control avilable (System.Web.UI.WebControls.Image) which doesn`t have any .Source propery apart form .Url. How do I display Bitmap object on the page ?
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Oct 5, 2010
How can I to use System.Drawing.Bitmap class into athoer class?
using System.Data;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
namespace University
{
public class Class1
{
System.Drawing.Bitmap BMP=new System.Drawing .Bitmap();
}
}
when I use System.Drawing.Bitmap gives error this class does not exists
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Mar 11, 2011
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.
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Apr 9, 2013
How do i import system.drawing into a page. I created a page called pie chart.aspx but instead of just using image of a pie chart i want to use the system.drawings to create a pie chart with atleast 3 distributions or more like, red, green and blue or something. how do i accomplish that. I tried youtubeing and google but nothing really worked. I know its suppose to be in code behind page but how??/
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Oct 19, 2010
I have a class (let's call it Car) that has a property of type System.Drawing.Color (Call it CarColor). I have a script service function that uses this Car class as a return value, which works just fine. I then have another script service function that takes a Car object as a parameter. I would like to change the color of the car in Javascript, but I am finding it difficult to do so without adding another parameter that takes in the color as a string and is then translated at the server. Are there any ideas on how to set the Color property of the Car object in Javascript and maintain it through to the server?
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May 28, 2010
I return array of images ( System.Drawing.Image[] ) from database and i want to show them in datagrid or datalist .. how to do that ?
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Jul 22, 2010
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?
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Mar 12, 2010
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]....
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Feb 10, 2011
i had drawed a graph by clicking a analyze button, however when i click it, it will go to a new screen. below is my coding:
[Code]....
below is the condition i want, when i click the button Analyze, the image (graph) is showed under the button with the header and template:
[Code]....
my current condition is when i click the button analyze, it will totaly display the graph only without the header and template as print screen below: how to change the coding to let the template and heaser showed together with the bar chart?
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Feb 9, 2010
I 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.
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May 5, 2010
I have a colorpicker.png file and track the pixel clicked in codebehind using GetPixel. Works like a charm, but I read that converting to a bitmap on the fly is rather heavy on the server. Therefore I saved my .png file as a .bmp as well, so that a converted file would already exist. However, I don't seem tobe able to just use the bitmap file, but need to create a new bitmap from the bitmap...
My question is: The code below works (I provide it here for those who might need it - simply add the code below to codebehind and this code in your aspx page <asp:ImageButton
ID="cpRubrik"
runat="server"
ImageUrl="~/img/colorpicker.png"
/> ;
also note that the image can be whatever you want - a photo or a screendump of a colorpicker from say Photoshop or VS; and note that it's wise to put everything you need in an updatepanel). Should I write something else in order to get smarter access to the bitmap?
Protected Sub cpRubrik_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles cpRubrik.Click
tbUtseenderub.ForeColor = BytFarg(e.X, e.Y)
End Sub
Protected Function BytFarg(ByVal x As Integer, ByVal y As Integer) As Color
Dim myBitmap As New Bitmap(Server.MapPath("~/img/colorpicker.bmp"))
Dim clr As Color = myBitmap.GetPixel(x, y)
Return clr
End Function
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Mar 7, 2010
Using 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;
}
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Jun 4, 2010
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?
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Mar 22, 2010
I want to write a unit tetsing code for this function
[Code]....
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]....
[Code]....
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Oct 11, 2010
Anyone have good example of how to write text onto a jpg image and resave it using System.Drawing in .NET?
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Oct 11, 2010
I am using the following code to draw text onto a jpg image but it requires x/y coordinate percision on where to place the text.
[code]....
How would I go about centering text onto an image? I am guessing it would have to do with defining some sort of container (rectangle maybe?) that is the width of the image and centering the text within that? Not sure what the best practice would be for this.
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Jan 4, 2010
Does anyone know if the following is possible and if so what the best way of doing it is for free? I am generating a PrintDocument in a project I am currently working on and displaying a print dialog box so a user can choose which printer they want to use etc. The is currently a windows form application and if a user wants to print to a PDF they can select to print to CutePDF or something similar. However I am now putting a ASP.Net web frontend on the application and want to use the same code to generate the PrintDocument but want to print it to a PDF on the fly and serve it up via the Response stream in the format of a PDF download. So my question is....How can I use the current PrintDocument and generate a PDF in memory from it?
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Aug 9, 2010
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
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Feb 11, 2011
i had draw a graph, however i want to display it. can display it to literal?
below is my coding:
' Create an in-memory bitmap where you will draw the image.
' The Bitmap is 300 pixels wide and 200 pixels high.
myImage = New Bitmap(1200, 1200, pixelFormat.Format48bppRgb)
' Get the graphics context for the bitmap.
g = Graphics.FromImage(myImage)
g.DrawString(I_fault_all2(i), New Font("Verdana", 12, FontStyle.Bold), Brushes.Black, xInterval * i + 50 + (width / 3), 500)
g.DrawString(I_total(i), New Font("Verdana", 12, FontStyle.Bold), Brushes.Black, xInterval * i + 50 + (width / 3), 500 - height - 25)
' Draw the axes
g.DrawLine(Pens.Blue, 30, 10, 30, 500)
' y-axis
g.DrawLine(Pens.Brown, 20, 500, 490, 500)
' x-axis
here is the coding i don't want as display as below, because it will go to a new screen without header and template.
[Code]....
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Nov 1, 2010
All of a sudden I started getting this nasty exception all over the place:
The type initializer for 'System.Drawing.ToolboxBitmapAttribute' threw an exception.
Some relevant observations: * The error started occuring a few hours after the last deployment to the live server, not immediately after. So it basically started occuring of its own accord.
* We have recently moved to a new host (a VPS). The error only occurs on that server, not our local server nor at the old host's (which was a shared environment).
* The problem is basically the same as this: [URL]
* I tried reinstalling Ajax extensions, then our website in IIS, then finally the .Net 2 framework. But the error still occurs after all this.
* The error occurs on line 1, which is just the page directive: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Test.WebForm1" %>
I'm finding it difficult to get a decent trace, but here is one that our CMS provided:
The type initializer for 'System.Drawing.ToolboxBitmapAttribute' threw an exception.
at System.Web.UI.TemplateParser.ProcessException(Exception ex)
at System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding)
at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding)
at System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath)
at System.Web.UI.TemplateParser.ParseInternal()
at System.Web.UI.TemplateParser.Parse()
at System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType()
at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider)
at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders()
at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath)
at System.Web.UI.TemplateControl.LoadControl(String virtualPath)
at umbraco.macro.loadUserControl(String fileName, Hashtable attributes, page umbPage)
My own code doesn't use the ToolboxBitmapAttribute, but third party products like Peter Blum's and Telerik's do.
Peter Blum replied with some useful hints:
* The "type initializer" concept probably needs some research, but I'm guessing that is an important clue. A quick web search of "type initializer" finds many situations it occurs for a variety of classes.
* The stack trace suggests that this is happening as ASP.NET is compiling your web form. The error is happening as the ASP.NET parser runs. Again this is external from my code (even creating or "type initializing" the attribute is not something my code does).
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Oct 7, 2010
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.
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Jan 17, 2010
<asp:TextBox
id="txtFromDate"
runat="server"
CssClass="TextBox"
MaxLength="10"
Width="100px"></asp:TextBox>
I have an asp.net web page and i would like to display the system date, on the first time page display?
Can this be done in asp.net or must it be passed from C# or is it a Javascript type thing.
Also can you 'Set InitalValue = "2010-01-01" in the above statement?
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Aug 27, 2010
I got a hard time with the Image.FromStream method in my website. The code below works perfect on my computer. But when I uploaded it to the test server, it always gives me "Parameter not valid" exception.
if (!afuImageFile.IsUploading && afuImageFile.HasFile)
{
System.Drawing.Image imgFile = System.Drawing.Image.FromStream(afuImageFile.FileContent);
}
the afuImageFile is an AsynFileUploader control in Ajax Tool Kits. afuImageFile.FileContent is a HttpInputStream.
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May 12, 2010
I 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?
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Jan 5, 2010
Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.TextBox'.
[code]....
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