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Certainly willing to try 
If the images will be obtained from a scanner, I'd suggest that you first implement code that will detect the skew angle and correct it. I seem to remember adapting some code with a name of gmeDeskew or something like that.
Next, you'll want to define the areas of interest. That is, the areas that will contain check-boxes that should be examined. Since different skew angles will result in images of slightly different sizes when deskewed, I'd suggest that these areas are defined using percentage of document width/height, as opposed to being defined in terms of number of pixels.
Once you have correctly deskewed the image and identified the areas of interest, you'll want to scan the image line-by-line, row by row to determine areas likely to contain check-boxes within your area of interest. Once done, examine the heck-boxes by simply counting the number of percentage of pixels that are below a certain brightness (you'll have to determine this threshold)
I coded an app once that would take scanned images of (college) attendance sheets, identifying the class name/week from a barcode, the student IDs from barcodes, then finally - the student attendance from manually colored 'radio buttons'
With this method, I was able to take an example image (at 1/4 scale as it happened) then deskew it and draw rectangles around each of the 18 barcodes for student ID, the 18 attendance scores for the students, the class name barcode and the class date barcode.
Then when I used full size images all of my areas of interest remained aligned correctly. (Using percentages of image size GREATLY improved the accuracy of the placement of the areas of interest onto each successive image. Prior to that idea, it was very difficult to be sure that I was going to examine the pixels that made up the parts of the image I was interested in)
Something else to consider is "pattern matching", or put simply - the comparing of pre-existing images with portions of the scanned document. You could simply use two images - one of an empty square and another of a check-box with a cross/dot/dash inside it. This should be effective because regardless of the style of marking, an empty box is always going to more closely resemble the saved image you have of an empty box (rather than the checked-box).
It's an interesting topic, OMR. (optical mark recognition) Enjoy!
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The image is scanned from the scanner, and i want to get the marked check-boxes.
Please provide me a sample code if you can .
Thanks
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I'd throw you the C# version, but I don't have one - I converted this code to c++
You can then find an algorithm to rotate by -skewAngle. (I'll leave that to you)
I might add, I spent many 10s of hours on this project. For your own sanity, I suggest patience!
Imports Microsoft.VisualBasic
Public Class deskew
Public Class HougLine
Public Count As Integer
Public Index As Integer
Public Alpha As Double
Public d As Double
End Class
Dim cBmp As Bitmap
Const stepsPerDeg = 5
Const minAngle = -13
Const maxAngle = 13
Dim cAlphaStart As Double = minAngle
Dim cAlphaStep As Double = 1 / stepsPerDeg
Dim cSteps As Integer = (maxAngle - minAngle) * stepsPerDeg
Dim cSinA() As Double
Dim cCosA() As Double
Dim cDMin As Double
Dim cDStep As Double = 1
Dim cDCount As Integer
Dim cHMatrix() As Integer
Public getPixelCalls As Long
Public Sub setAngleRange(ByVal minAngle As Long, ByVal maxAngle As Long)
cAlphaStart = minAngle
cSteps = (maxAngle - minAngle) / cAlphaStep
End Sub
Public Function GetSkewAngle() As Double
Dim hl() As deskew.HougLine
Dim i As Integer
Dim sum As Double
Dim count As Integer
Calc()
hl = GetTop(20)
For i = 0 To 19
sum += hl(i).Alpha
count += 1
Next
Return sum / count
End Function
Private Function GetTop(ByVal Count As Integer) As HougLine()
Dim hl() As HougLine
Dim i As Integer
Dim j As Integer
Dim tmp As HougLine
Dim AlphaIndex As Integer
Dim dIndex As Integer
ReDim hl(Count)
For i = 0 To Count - 1
hl(i) = New HougLine
Next
For i = 0 To cHMatrix.Length - 1
If cHMatrix(i) > hl(Count - 1).Count Then
hl(Count - 1).Count = cHMatrix(i)
hl(Count - 1).Index = i
j = Count - 1
While j > 0 AndAlso hl(j).Count > hl(j - 1).Count
tmp = hl(j)
hl(j) = hl(j - 1)
hl(j - 1) = tmp
j -= 1
End While
End If
Next
For i = 0 To Count - 1
dIndex = hl(i).Index \ cSteps
AlphaIndex = hl(i).Index - dIndex * cSteps
hl(i).Alpha = GetAlpha(AlphaIndex)
hl(i).d = dIndex + cDMin
Next
Return hl
End Function
Public Sub New(ByVal bmp As Bitmap)
cBmp = bmp
End Sub
Private Sub Calc()
Dim x As Integer
Dim y As Integer
Dim hMin As Integer = cBmp.Height / 4
Dim hMax As Integer = cBmp.Height * 3 / 4
Init()
For y = hMin To hMax
For x = 1 To cBmp.Width - 2
If IsBlack(x, y) Then
If Not IsBlack(x, y + 1) Then
Calc(x, y)
End If
End If
Next
Next
End Sub
Private Sub Calc(ByVal x As Integer, ByVal y As Integer)
Dim alpha As Integer
Dim d As Double
Dim dIndex As Integer
Dim Index As Integer
For alpha = 0 To cSteps - 1
d = y * cCosA(alpha) - x * cSinA(alpha)
dIndex = CalcDIndex(d)
Index = dIndex * cSteps + alpha
Try
cHMatrix(Index) += 1
Catch ex As Exception
Debug.WriteLine(ex.ToString)
End Try
Next
End Sub
Private Function CalcDIndex(ByVal d As Double) As Double
Return Convert.ToInt32(d - cDMin)
End Function
Private Function IsBlack(ByVal x As Integer, ByVal y As Integer) As Boolean
Dim c As Color
Dim luminance As Double
getPixelCalls += 1
c = cBmp.GetPixel(x, y)
luminance = (c.R * 0.299) + (c.G * 0.587) + (c.B * 0.114)
Return luminance < 140
End Function
Private Sub Init()
Dim i As Integer
Dim angle As Double
getPixelCalls = 0
ReDim cSinA(cSteps - 1)
ReDim cCosA(cSteps - 1)
For i = 0 To cSteps - 1
angle = GetAlpha(i) * Math.PI / 180.0#
cSinA(i) = Math.Sin(angle)
cCosA(i) = Math.Cos(angle)
Next
cDMin = -cBmp.Width
cDCount = 2 * (cBmp.Width + cBmp.Height) / cDStep
ReDim cHMatrix(cDCount * cSteps)
End Sub
Public Function GetAlpha(ByVal Index As Integer) As Double
Return cAlphaStart + Index * cAlphaStep
End Function
End Class
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Hello guys!
I am trying to use the following code to send an email to a mail server over a tcp connection. The code works great, however, when I try to send an email to someone, the receipt of my Email alwyes gets unknown sender(From). Am I missing something?
TcpClient SmtpServ = new TcpClient("smtp.my.com", 25);
string Data;
byte[] szData;
string CRLF = "\r\n";
try
{
NetworkStream NetStrm = SmtpServ.GetStream();
StreamReader RdStrm = new StreamReader(SmtpServ.GetStream());
Console.WriteLine(RdStrm.ReadLine());
Data = "HELO server" + CRLF;
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
Data = "MAIL From:" + " me@test.com" + CRLF;
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
Data = "RCPT TO: " + "me@my.net" + CRLF;
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
Data = "DATA" + CRLF;
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
Data = "SUBJECT: my subject\r\n\r\n";
Data += "Hello there!\r\n";
Data += ".\r\n";
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
Data = "QUIT" + CRLF;
szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
NetStrm.Write(szData, 0, szData.Length);
Console.WriteLine(RdStrm.ReadLine());
NetStrm.Close();
RdStrm.Close();
Console.WriteLine("Close connection");
Console.WriteLine("Send mail successly..");
}
catch (InvalidOperationException err)
{
Console.WriteLine("Error: " + err.ToString());
}
Thanks,
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The email address in the MAIL FROM: and RCPT TO: lines should be bounded with < and > characters like this:
"MAIL From:" + " <me@test.com>" + CRLF;
I also notice that you are ignoring all server responses so you cannot be sure your message is being accepted correctly. You may also like to consider using the SmtpClient()[^] class to process your mail.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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Hello Guys,
We are developing an antispyware program in .net and i want to register my product for listing it into windows security center. I Searched a lot about it and got some idea that it can be done through WMI by \\root\SecurityCenter2 namespace and antispywareproduct class. But all i found was to get the information for antispywareproduct class.
Can any one tell me how to add my product to this table.
any ideas will be a great help.
Regards
abhinav
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Hello all,
I found this link .NET TWAIN image scanner[^] on code project, but When I press acuqire it opens a window from my scanner
when I press cancel on it, the whole application get freezed. How to solve this???
plzz
Thx
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The best place to ask that is in the forum at the bottom of the mentioned article.
If you post there, the author will be notified. He is the person that more likely than others can help you.
Ciao,
luker
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Hi all.
I'm now developing a website that connect to Postgre SQL database. I used NpgSQL.DLL to connect from C# to database. I also finished testing this project in my local pc, it worked well. But unfortunately it did not work well in server. Some errors in connecting to server happened.
These errors happened when website had much people logged in and began using database query functions ( select, update, delete .. ). I think errors begin from codes in connect database functions. but i still can not fix it. this is my connecting database codes.
------ codes connects database ---------
-- Connect.cs file.
public static void connectDB()
{
try
{
conn.ConnectionString = connection;
conn.Open();
}
catch
{
}
}
public static void closeConnectDB()
{
conn.Close();
}
public static int ExecuteQuery(string SQL)
{
try
{
connectDB();
NpgsqlCommand cmd = new NpgsqlCommand(SQL, conn);
return cmd.ExecuteNonQuery();
}
catch
{
closeConnectDB();
return 0;
}
}
public static DataSet SelectQuery(string SQL)
{
DataSet ds = new DataSet();
try
{
connectDB();
NpgsqlDataAdapter nDa = new NpgsqlDataAdapter(SQL, conn);
nDa.Fill(ds);
return ds;
}
catch
{
closeConnectDB();
return ds;
}
}
----------------- use to execute these codes --------
....
--- calling functions files.
try
{
string strTest = "Select * from abc where .. ";
DataSet ds1 = new DataSet();
ds1 = Connect.SelectQuery(strTest);
if (ds1.Tables[0].Rows.Count > 0)
{
}
else
{
int kq = Connect.ExecuteQuery(strInsert);
if (kq > 0)
{
int kk = Connect.ExecuteQuery(strUpdate);
kk = Connect.ExecuteQuery(strUpdate2);
strHTML = "OK";
}
}
}
catch
{
strHTML = "errors.";
}
finally
{
int kk = Connect.ExecuteQuery(strUpdate);
kk = Connect.ExecuteQuery(strUpdate2);
strHTML += "-- Sub Finally";
}
-----------------End calling function---------------
Here sometimes it worked well but sometimes catched errors.
Can you help me? thanks and regards.
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Don't just swallow exceptions, at the very least you should log them to console or a log file so you can look at the stack trace and exception message. Those error messages will almost certainly give you a big clue as to the problem.
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Hi everyone,
I want to integrate a C# application for paperless billing with a retail billing machine (those which are used in shopping malls for generating bills). Is there any way it can be done? Did not get any information about it on Google.
-Please help.
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tahernd wrote: I want to integrate a C# application for paperless billing with a retail billing machine
What software exists in this machine and what interface(s) does it provide (both software and hardware) for connection with other applications?
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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tahernd wrote: retail billing machine
Probably because you need to give it another name, cash register, and they run Point Of Sale (POS) software.
As Richard said find out the the POS being used and see if it has an API/Interface you can hook into.
Never underestimate the power of human stupidity
RAH
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Thanks
Got some reference C# API for POS.
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I am using an HTTP-based API to a 3rd-party service. Its usage involves two steps: POSTing a login command (which saves the session in a cookie), then issuing another command. I have tested this successfully in a console app, but when I try to use it in a (production) Windows service I am getting a 407 Proxy error back.
Is there some difference between them regarding HttpWebRequests? I don't believe so but I'm scratching my head here.
private WebResponse webPOST(string URLextension, string Parameters)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(BASE_URL + URLextension);
request.ContentType = "application/x-www-form-urlencoded";
request.Method = "POST";
request.Headers.Add("X-Requested-With: C# Interface");
request.CookieContainer = _cookieJar;
request.Timeout = 3600000;
if (_proxy != string.Empty)
{
request.Proxy = new System.Net.WebProxy(_proxy, false);
request.Proxy.Credentials = new
NetworkCredential(_proxyUser.ConvertToUnsecureString(), _proxyPass.ConvertToUnsecureString());
}
byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes(Parameters);
Stream reqstr = request.GetRequestStream();
reqstr.Write(buffer, 0, buffer.Length);
reqstr.Close();
return request.GetResponse();
}
The _cookieJar is a private property used to store the cookie generated by login. Both the login command and the "objective" command are issued via this private method, and the entire thing works with no errors in a console app.
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The windows service is running under a user. Did you test the console app while logged in as that user?
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A good idea, and I tried running the console app under the same account as the service and it worked, so no change there. It always seems to run as a console app but never under the Windows service.
I had previously done the reverse (run the service under the same credentials as I was using for the console app), but it did not work.
Thanks...
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The window service is running, by default, under the Local System account, which probably does not have access to your proxy server. The 407 error is Authentication Required, which is why your code works when running from a Console app, which is run by you and runs AS you and it doesn't work as a service.
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I understand what you are saying, but that is not the case here. The sevice is running under the same credentials used for proxy authentication; I changed it after I first installed the service by running services.msc and changing it on the "Log On" tab on the service's properties. I have run the console app under that account though, and it worked (unlike the service).
What you're saying is valid, but it was already covered...
But I'm still scratching my head on this. 
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I have solved the mystery...
The problem was not in the code above, but in what was done with the response stream, which is in XML. Unfortunately, that XML contains a DTD that was causing the problem, when the XmlDocument class tried to retrieve it and failed (because it's not using the proxy credentials properly).
And, of course, the "difference" was that in my console app I was just spitting the XML onto the screen, not loading an XmlDocument class.
Thanks for the help for those who looked, though... 
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Timothy CIAN wrote: And, of course, the "difference" was that in my console app I was just spitting
the XML onto the screen, not loading an XmlDocument class.
Ahh...
When I deliver a windows service I deliver it with a corresponding console app.
The service code and the console code do nothing except call to the real functionality of the system.
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Hopefully no one minds if I put this here and hopefully someone knows the answer. I'm trying to do it in C#. I put it on Technet, but no replys yet. There does not seem to be any reference to this on the web.
I have a real problem. I have Visual Studio 2010 Professional (on Windows 7 Proefessional). If I try to open a .CS file of a project from the Solution Explorer, I get the message (that can't be copied and pasted). The same thing happens if I try to start a new project.
Could not load file or assembly 'Microsoft MSXML, Version=8.0.0.0, Culture=neutral, PublicKey Token=b03f5f7f11d50a3a' or one of its dependencies. The module was expected to contain an assembly manifest.
I researched this on the web and it's about the MS XML parser (web messages about that are complicated with 4 versions of the dll). c:\windows\assembly\Microsoft.MSXML. I cannot find anything about this error message. I reloaded SP1 for luck... That got me a new message about some editor software not loading correctly, but did not fix the problem.
It used to work right. I made no environment changes that I know of. This is a simple Windows application, but it has the same failure when trying to open a *.aspx.cs file. When trying to open a .ASPX file, the error message is: Visual Studio has encountered an unexpected error. Helpful, that one.
I don't really want to re-install Visual Studio (wherever the disk is right now).
Notice that it says the problem is the assembly manifest.
Anyway, any thoughts would be really appreciated.
Thanks, Mike
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Try this[^] one.
Member 7980583 wrote: I don't really want to re-install Visual Studio (wherever the disk is right now).
One install per license. If the disc is lost, the installation is lost.
Seen one too many software-shop that does "everything" to prevent pirating their product while using illegal version of Windows/Visual Studio/Sql Server..
Bastard Programmer from Hell 
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I think I tried that, but it didn't fix it. I did reboot to make sure.
Can't believe no one has see this before.
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Aw, many have seen this before, and most of the time it's fixed with updating the MS XML libraries. If doesn't, chances are that your program requires a specific version.
Bastard Programmer from Hell
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