ASP.NET

Create text image using handler

2-Jan-08 23:14

Christian Graus wrote:
I know I've told you this at least 15 times,

haha.

maybe.. he wants to hear more and more.. Smile | :)

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Imran Khan Pathan2-Jan-08 20:05

Imran Khan Pathan

2-Jan-08 20:05

Hi friends.

I have coded to create text image using handler.But i can not get clarity of the image.

please visit these links.

BuildAsign[^] and Mysite[^]

My handler code here

public class getImage : IHttpHandler
{
MemoryStream PlotText(string text)
{

try
{
string fontFamily = GetArg("family", "Verdana");
float fontSize = float.Parse(GetArg("size", "12")); // assumed to be pixels
bool fontBold = bool.Parse(GetArg("bold", "false"));
bool fontItalic = bool.Parse(GetArg("italic", "false"));
bool fontUnderline = bool.Parse(GetArg("underline", "false"));
int iWidth = int.Parse(GetArg("width", "100"));
int iHeight = int.Parse(GetArg("height", "100"));
//int action = int.Parse(GetArg("action", "0"));
iHeight = int.Parse(fontSize.ToString()) + 10;
string isImage = GetArg("isImage", "true");
Color fontColor = GetColor(GetArg("color", "Black"));

//this is namespace for true virtual catch

if (text.Length > 100)
text = text.Substring(0, 100);
if (fontSize > 400)
fontSize = 400;

iWidth = text.Length * int.Parse(fontSize.ToString());
SizeF size = new SizeF(1, 1);
Font font = null;

try
{
Bitmap bitmap = new Bitmap(1, 1);

Graphics g = Graphics.FromImage(bitmap);

g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.TextRenderingHint =TextRenderingHint.AntiAlias;
g.SmoothingMode = SmoothingMode.HighQuality;

FontStyle fontStyle = FontStyle.Regular;
if (fontBold) fontStyle |= FontStyle.Bold;
if (fontItalic) fontStyle |= FontStyle.Italic;
if (fontUnderline) fontStyle |= FontStyle.Underline;
//fontSize = ((float)(iWidth / iHeight)) + iWidth;
font = new Font(fontFamily, fontSize, fontStyle, GraphicsUnit.World);
// could get fancy here with StringFormat options
size = g.MeasureString(text, font);

int mW = int.Parse(fontSize.ToString()) / 2;

int w = mW / 2;

//if (isImage == "true")
// bitmap = new Bitmap((int)size.Width+w - mW, (int)size.Height - mW, PixelFormat.Format64bppPArgb);
//else
bitmap = new Bitmap((int)size.Width, (int)size.Height, PixelFormat.Format64bppPArgb);

g = Graphics.FromImage(bitmap);

SolidBrush br = new SolidBrush(Color.White);

g.FillRectangle(br, 0, 0, bitmap.Width, bitmap.Height);

br = new SolidBrush(fontColor);

//StringFormat sf = new StringFormat();
//sf.Alignment = StringAlignment.Center;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//g.TextRenderingHint = TextRenderingHint.AntiAlias;
//if (isImage == "true")
// g.DrawString(text, font, br, new PointF(-w + 5, -w + 2));
//else
g.DrawString(text, font, br, new PointF(0,0));

MemoryStream m = new MemoryStream();
bitmap.Save(m, ImageFormat.Gif);

return MakeTransparent(m);
}

finally
{
if (font != null) font.Dispose();
}

}
catch
{
return PlotError();
}
}

MemoryStream PlotError()
{

MemoryStream m = new MemoryStream();

using (Bitmap bitmap = new Bitmap(40, 15, PixelFormat.Format32bppArgb))
{
using (Graphics g = Graphics.FromImage(bitmap))
{
using (SolidBrush br = new SolidBrush(Color.White))
{
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.FillRectangle(br, 0, 0, bitmap.Width, bitmap.Height);
}
using (Pen p = new Pen(Color.Red))
{
g.DrawLine(p, 0, 0, bitmap.Width, bitmap.Height);
g.DrawLine(p, 0, bitmap.Height, bitmap.Width, 0);
}
bitmap.Save(m, ImageFormat.Gif);
}
}
return MakeTransparent(m);
}

void ok()
{
SetResponse(HttpStatusCode.OK, "Ok");
}

void error()
{
error(HttpStatusCode.BadRequest, "Bad Request");
}
void error(HttpStatusCode statusCode, string statusDescription)
{
SetResponse(statusCode, statusDescription);
_response.BinaryWrite(PlotError().ToArray());
_response.End();
}

#region ---- Process Request -----
HttpRequest _request;
HttpResponse _response;

public void ProcessRequest(HttpContext context)
{

_request = context.Request;
_response = context.Response;

if (!(("GET" == _request.RequestType) || ("HEAD" == _request.RequestType)))
error(HttpStatusCode.MethodNotAllowed, "Method Not Allowed");

string text = GetArg("text", "");
if (text.Length == 0)
error();

ok();

_response.BinaryWrite(PlotText(text).ToArray());

}
#endregion

public bool IsReusable
{
get { return false; }
}

// --------------------------------------------------------------------

string GetArg(string argName, string argDefault)
{
string arg = _request.QueryString[argName];
if ((null == arg) || (arg.Length == 0)) return argDefault;
return arg;
}

void SetResponse(HttpStatusCode statusCode, string statusDescription)
{
_response.ContentType = "image/gif";
_response.StatusCode = (int)statusCode;
_response.StatusDescription = statusDescription;
_response.Flush();
}

Array Redim(Array origArray, int newSize)
{
Type t = origArray.GetType().GetElementType();
Array newArray = Array.CreateInstance(t, newSize);
Array.Copy(origArray, 0, newArray, 0, Math.Min(origArray.Length, newSize));
return newArray;
}

Color GetColor(string color)
{
if (color.StartsWith("#"))
{
return Color.FromArgb(IntFromHexRgbPart(color, RgbPart.RgbPartRed),
IntFromHexRgbPart(color, RgbPart.RgbPathGreen),
IntFromHexRgbPart(color, RgbPart.RgbPartBlue)
);
}
return Color.FromName(color);
}

enum RgbPart { RgbPartRed, RgbPathGreen, RgbPartBlue };

int IntFromHexRgbPart(string hexRgb, RgbPart part)
{
if ((null == hexRgb) || (hexRgb.Length == 0) || (!(hexRgb.StartsWith("#"))))
return 0;
try
{
switch (part)
{
case RgbPart.RgbPartRed:
if (hexRgb.Length < 3) return 0;
return IntFromHex(hexRgb.Substring(1, 2));
case RgbPart.RgbPathGreen:
if (hexRgb.Length < 5) return 0;
return IntFromHex(hexRgb.Substring(3, 2));
case RgbPart.RgbPartBlue:
if (hexRgb.Length < 7) return 0;
return IntFromHex(hexRgb.Substring(5, 2));
default:
return 0;
}
}
catch { return 0; }
}

int IntFromHex(string hex)
{
return (int)byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);
}

MemoryStream MakeTransparent(MemoryStream origBitmapMemoryStream)
{

Color transparentColor = GetColor("White");
int transparentArgb = transparentColor.ToArgb();

using (Bitmap origBitmap = new Bitmap(origBitmapMemoryStream))
{
using (Bitmap newBitmap = new Bitmap(origBitmap.Width, origBitmap.Height, origBitmap.PixelFormat))
{

ColorPalette origPalette = origBitmap.Palette;
ColorPalette newPalette = newBitmap.Palette;

int index = 0;
int transparentIndex = -1;

foreach (Color origColor in origPalette.Entries)
{
newPalette.Entries[index] = Color.FromArgb(255, origColor);
if (origColor.ToArgb() == transparentArgb) transparentIndex = index;
index += 1;
}

if (-1 == transparentIndex)
{
return origBitmapMemoryStream;
}

newPalette.Entries[transparentIndex] = Color.FromArgb(0, transparentColor);
newBitmap.Palette = newPalette;

Rectangle rect = new Rectangle(0, 0, origBitmap.Width, origBitmap.Height);

BitmapData origBitmapData = origBitmap.LockBits(rect, ImageLockMode.ReadOnly, origBitmap.PixelFormat);
BitmapData newBitmapData = newBitmap.LockBits(rect, ImageLockMode.WriteOnly, newBitmap.PixelFormat);

for (int y = 0; y < origBitmap.Height; y++)
{
for (int x = 0; x < origBitmap.Width; x++)
{
byte origBitmapByte = Marshal.ReadByte(origBitmapData.Scan0, origBitmapData.Stride * y + x);
Marshal.WriteByte(newBitmapData.Scan0, newBitmapData.Stride * y + x, origBitmapByte);
}
}

newBitmap.UnlockBits(newBitmapData);
origBitmap.UnlockBits(origBitmapData);

MemoryStream m = new MemoryStream();

newBitmap.Save(m, ImageFormat.Gif);
return m;

}
}

}

}

please don't forget to vote on the post that helped you.

OWC webchart issue

uglyeyes2-Jan-08 20:01

uglyeyes

2-Jan-08 20:01

Hi I am trying use OWC chart component to draw a comparative graph that will show

list of years and sales actual and sales budgeted. so i have three columsn

year actual budgeted
2004 20 30
2005 21 32

now i am trying to show year in x axis and have seperate graphs for 20 and 30 in year 2004 and 2005. I am not getting able to show both i can only show one can any please help me with it i have attached the code for easy understanding

------
Dim dsPropertyCapex As DataSet = myDAL.getBudgetVsActual(domainid, locationid, buildingcomponentid, PortfolioId, userId)
If Not dsPropertyCapex Is Nothing Then
gvPropertyHisex.DataSource = dsPropertyCapex
gvPropertyHisex.DataBind()
'Now Build a graph from the dataset

Dim oChartSpace As New Owc11.ChartSpaceClass()
Dim objChart As Owc11.ChChart = oChartSpace.Charts.Add(0)
objChart.HasTitle = True
objChart.Title.Caption = "Capital Expenditure Graph"
objChart.HasLegend = True
objChart.Legend.Border.DashStyle = Owc11.ChartLineDashStyleEnum.chLineDash
objChart.Legend.Position = Owc11.ChartLegendPositionEnum.chLegendPositionRight

Dim sw As New System.IO.StringWriter()
Dim xDoc As New XmlDocument()
dsPropertyCapex.WriteXml(sw)
' clean up

xDoc.LoadXml(sw.ToString())
sw.Close()
Dim nodes As System.Xml.XmlNodeList
nodes = xDoc.ChildNodes.Item(0).ChildNodes
Dim nCount As Integer = nodes.Count
Dim aActual As String() = New String(nCount - 1) {}
Dim aBudgeted As String() = New String(nCount - 1) {}
Dim aEOY As String() = New String(nCount - 1) {}
Dim Actual As String = [String].Empty
Dim Budgeted As String = [String].Empty
Dim EOY As String = [String].Empty
Dim i As Integer = 0
For i = 1 To nCount
aActual(i - 1) = nodes.Item(i - 1).ChildNodes.Item(0).InnerText
aBudgeted(i - 1) = nodes.Item(i - 1).ChildNodes.Item(1).InnerText
aEOY(i - 1) = nodes.Item(i - 1).ChildNodes.Item(2).InnerText

Next

Actual = [String].Join("" & Chr(9) & "", aActual)
Budgeted = [String].Join("" & Chr(9) & "", aBudgeted)
'Chart control accepts tab-delimited string of values
EOY = [String].Join("" & Chr(9) & "", aEOY)

'oChartSpace.Charts.Add(0)
objChart.SeriesCollection.Add(0)
objChart.SeriesCollection(0).SetData(Owc11.ChartDimensionsEnum.chDimValues, Convert.ToInt32(Owc11.ChartSpecialDataSourcesEnum.chDataLiteral), Actual)
objChart.SeriesCollection(0).SetData(Owc11.ChartDimensionsEnum.chDimCategories, Convert.ToInt32(Owc11.ChartSpecialDataSourcesEnum.chDataLiteral), EOY)
'objChart.SeriesCollection(0).SetData(Owc11.ChartDimensionsEnum.chDimCategories, Convert.ToInt32(Owc11.ChartSpecialDataSourcesEnum.chDataLiteral), Actual)
'objChart.SeriesCollection(0).SetData(Owc11.ChartDimensionsEnum.chDimCategories, Convert.ToInt32(Owc11.ChartSpecialDataSourcesEnum.chDataLiteral), Budgeted)

objChart.SeriesCollection.Add(1)
objChart.SeriesCollection(1).SetData(Owc11.ChartDimensionsEnum.chDimValues, Convert.ToInt32(Owc11.ChartSpecialDataSourcesEnum.chDataLiteral), Budgeted)

Dim strFullPathAndName As String = Server.MapPath(System.DateTime.Now.Ticks.ToString() + ".gif")
oChartSpace.ExportPicture(strFullPathAndName, "gif", 600, 400)
imgCapexGraph.ImageUrl = Server.UrlEncode(Path.GetFileName(strFullPathAndName))
imgCapexGraph.Visible = True
RemoveFiles(Server.MapPath("."))

faster execution in case of anchor tags , link buttons

Sonia Gupta2-Jan-08 19:58

Sonia Gupta

2-Jan-08 19:58

in the code project , the moment I click the thread to view the question , it instantly gets appeared (i have selected the normal option in the page (code project site)) . When i select the no java script , it takes time .In both the case , the request definitely goes to the server
Now my question is
1. what should I do In order to perform the same task?

What I thought so far is the jaa script, and java script database connectivity

2.Is this the right way to perform the task?

Yesterday is a canceled check. Tomorrow is a promissory note. Today is the ready cash. USE IT.

Re: faster execution in case of anchor tags , link buttons

N a v a n e e t h2-Jan-08 20:00

Re: faster execution in case of anchor tags , link buttons

2-Jan-08 20:00

Sonia Gupta wrote:
In both the case , the request definitely goes to the server

No in the normal case, all answers will be pre-loaded and request won't go to the server.

Sonia Gupta wrote:
what should I do In order to perform the same task?

It's just javascript and styles. You can find it looking into this page source.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

Sonia Gupta2-Jan-08 20:09

Sonia Gupta

2-Jan-08 20:09

ok Navaneeth , i am trying.

Yesterday is a canceled check. Tomorrow is a promissory note. Today is the ready cash. USE IT.

Re: faster execution in case of anchor tags , link buttons

Christian Graus2-Jan-08 22:10

Christian Graus

2-Jan-08 22:10

Sonia Gupta wrote:
In both the case , the request definitely goes to the server

What on earth made you thin that ? Turn on javascrpt. Browse to the lounge. Disconnect from the web and click on a post. You will find you can see it. There is no request to the server.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Creating a directory or folder `

.NET- India 2-Jan-08 19:57

.NET- India

2-Jan-08 19:57

Hello Everyone,

I'm creating directory in my project....but it's throwing an error
"Access to the path "c:\inetpub\wwwroot\KiritBhai\Gallery\Manoj" is denied"

My code is here as given below......
string add=Server.MapPath("../Gallery/")+"Manoj";
DirectoryInfo dir=new DirectoryInfo(add);
dir.Create();

but whenever i'm creating this folder in a drive like c,d and etc.
Then it's rocking..............

Re: Creating a directory or folder `

N a v a n e e t h2-Jan-08 19:59

Re: Creating a directory or folder `

2-Jan-08 19:59

The Knowledge wrote:
I'm creating directory in my project....but it's throwing an error
"Access to the path "c:\inetpub\wwwroot\KiritBhai\Gallery\Manoj" is denied"

Give write permission to your ASP.NET account. Or use impersonation.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

.NET- India 2-Jan-08 20:23

.NET- India

2-Jan-08 20:23

where to put the mpersonation in my code plz explain

Re: Creating a directory or folder `

N a v a n e e t h2-Jan-08 20:27

Dropdown Textbox in asp.net

2-Jan-08 20:27

The Knowledge wrote:
where to put the mpersonation in my code

You will get many results from google[^]. You should impersonate user before creating directory and remove impersonation after it's done.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

anujose2-Jan-08 19:51

anujose

2-Jan-08 19:51

Hi,

i want to Filter Items in a dropdown box when i type data in textbox.ie,if i will type A i want to display items from database based on A and when i press enter from the box i want to display that specified name in Textbox.based on that name i want to display value also.i want to scroll the items in that box also.if any one knows about this please let me know at the earliest

with regards,
Anu

N a v a n e e t h2-Jan-08 19:55

2-Jan-08 19:55

I think AJAX toolkit has such a control. Have you checked ?

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

anujose2-Jan-08 20:21

anujose

2-Jan-08 20:21

Michael Sync2-Jan-08 21:09

2-Jan-08 21:09

anujose wrote:
No

Why? Have you tried this link? ASP.NET Ajax - Autocomplete Example[^]

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Vasudevan Deepak Kumar2-Jan-08 19:58

Vasudevan Deepak Kumar

2-Jan-08 19:58

Check this out

http://www.codeproject.com/KB/ajax/AJAXAutoSuggest.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

A pessimist sees only the dark side of the clouds, and mopes; a philosopher sees both sides, and shrugs; an optimist doesn't see the clouds at all - he's walking on them. --Leonard Louis Levinson

problems in using servlets and applets in asp

rahul.net112-Jan-08 20:04

rahul.net11

2-Jan-08 20:04

Hi If u want to do it asynchronously then u can use AJAX and if u dont
mine if page get post back then on textchanged event use ilke query
and retrieve data from database using text in text box.

Regards.
Rahul.

People Laugh on me Because i am Different but i Laugh on them Because they all are same.

chanzeb2-Jan-08 19:50

chanzeb

2-Jan-08 19:50

Hi all,
I am new in Asp.Net.I want to use Servlets, Applets, Xml, XHTML and JavaScript in my website.
But I am not sure about Applets and Servlets, Whether these can be used in asp.Net or not.Urgent Response will be appritiated.

Regrds,
chanzeb chaudhary.

Vasudevan Deepak Kumar2-Jan-08 19:57

Vasudevan Deepak Kumar

2-Jan-08 19:57

chanzeb wrote:
Servlets

They are basically J2EE server side elements and need JSP/EJB programming.

chanzeb wrote:
Applets

Very much. You can either use APPLET or OBJECT tag to embed applets.

chanzeb wrote:
Xml

System.XML namespace

chanzeb wrote:
XHTML

It is the mainstream dialect of your website.

chanzeb wrote:
JavaScript

JavaScript for a webpage is like a sugar in coffee.

N a v a n e e t h2-Jan-08 19:57

2-Jan-08 19:57

chanzeb wrote:
about Applets and Servlets, Whether these can be used in asp.Net

Servlet can't be used. Because both works on different architecture. But ASP.NET can call a webservice where servlet might function internally. Applet you can use, because it works on client side.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

Michael Sync2-Jan-08 20:01

2-Jan-08 20:01

chanzeb wrote:
I am not sure about Applets and Servlets,

I'm also not sure why you want to use them. Can you tell me why? You are using ASP.NET, right? so, forget about those Java things.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Vasudevan Deepak Kumar2-Jan-08 20:26

Vasudevan Deepak Kumar

2-Jan-08 20:26

How about applets? At the moment, I don't think we have a competing equivalent from the Microsoft Camp.

1) Argue as 'ActiveX' but you are confronted with security issues, DLL Hell and all those stuff.
2) Argue as Winforms .NET Control and you force your users with downloading of a 23 mega bytes runtime vis-a-vis a Java Runtime that is just about 12 mega bytes.
3) Applets do have a good cross browser and cross platform reach. And you have a good chunk of users using FF, who you can forget.

N a v a n e e t h2-Jan-08 20:29

2-Jan-08 20:29

Vasudevan Deepak K wrote:
I don't think we have a competing equivalent from the Microsoft Camp.

I think Silverlight can do whatever applet can or a bit more. I do agree that applets are good, but I have seen very less websites which uses this.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

My Website | Ask smart questions

Michael Sync2-Jan-08 21:08