Re: Reading registry keys - C# Discussion Boards

Is there any method for detection of facila feature points in openCV??

Have a look here:

Face and Eyes Detection Using OpenCV[^]

and here (it's c++ but might be helpfull to read though):

http://opencv.willowgarage.com/wiki/FaceDetection[^]

You could also google for "face detection opencv c#" and you will get lots of results.

Hi all,

I have a prob ,how we can read the registry keys in c# and display or write it into a text file

Please help

Thanks in advance

Rakesh

Do a search on the internet - you will get tons of answers.
See here[^] for the first link my search returned.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Navigate the Given Link to open Google Search Engine for tons of Answer for your question
How to Read Registry Key[^]

Hope it Will works for you. Big Grin | :-D

Include the required Header Files and then open ur required key

RegistryKey Key = Registry.CurrentUser;

Once Opening the key open ur sub key as needed..

RegistryKey SubKey = Key.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders");

Read the values of sub keys into string (if it is a string else required data type)

string str = SubKey.GetValue("AppData").ToString();

Then ur almost done write this str value into file stream, so that ur task is acheived....

If u like my answer.... rate it Smile | :)

Thanks

Pardhu2 wrote:
Include the required Header Files

This is the C# forum.

Here ya go. Paste this code into a class and you're all set:

using System;
using System.Linq;
using Microsoft.Win32;
using System.Collections.Generic;

namespace Marois.Common.RegistryProcedures
{
    public static class RegistryProcedures
    {
        #region enum BaseKeys
        public enum BaseKey
        { 
            HKEY_CLASSES_ROOT,
            HKEY_CURRENT_CONFIG,
            HKEY_CURRENT_USER,
            HKEY_DYN_DATA,
            HKEY_LOCAL_MACHINE,
            HKEY_PERFORMANCE_DATA
        }
        #endregion

        #region Method CreateSubkey
        public static void CreateSubkey(BaseKey BaseKey, string KeyToAdd)
        {
            CreateSubkey(BaseKey, "", KeyToAdd);
        }
        public static void CreateSubkey(BaseKey BaseKey, string SubKey, string KeyToAdd)
        {
            RegistryKey baseKey;

            if (SubKey != "")
                baseKey = _GetRegistryBaseKey(BaseKey).OpenSubKey(SubKey, true);
            else
                baseKey = _GetRegistryBaseKey(BaseKey);


            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                baseKey.CreateSubKey(KeyToAdd);
            }
        }
        #endregion

        #region Method DeleteSubkey
        public static void DeleteSubkey(BaseKey BaseKey, string SubKey)
        {
            RegistryKey baseKey = _GetRegistryBaseKey(BaseKey);
            baseKey.DeleteSubKey(SubKey);
        }
        #endregion

        #region Method DeleteSubkeyTree
        public static void DeleteSubKeyTree(BaseKey BaseKey, string sSubKey)
        {
            RegistryKey baseKey = _GetRegistryBaseKey(BaseKey);
            baseKey.DeleteSubKeyTree(sSubKey);
        }
        #endregion

        #region Method DeleteSubkeyTreeValues
        public static void DeleteSubkeyTreeValues(BaseKey BaseKey, string sSubKey)
        {
            List<string> nodeNames = GetSubKeyNodeNames(BaseKey, sSubKey);

            if(nodeNames.Count > 0)
            {
                RegistryKey baseKey = _GetRegistryBaseKey(BaseKey);
                baseKey = baseKey.OpenSubKey(sSubKey, true);

                foreach(string nodeName in nodeNames)
                {
                    baseKey.DeleteValue(nodeName);                   
                }
            }
        }
        #endregion

        #region Method DeleteValue
        private static void DeleteValue(BaseKey BaseKey, string SubKey, string ValueToDelete)
        {
            RegistryKey baseKey;

            if (SubKey != "")
                baseKey = _GetRegistryBaseKey(BaseKey).OpenSubKey(SubKey, true);
            else
                baseKey = _GetRegistryBaseKey(BaseKey);

            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                baseKey.DeleteValue(ValueToDelete);
            }
        }
        #endregion Method DeleteValue

        #region Method GetSubkeyNames
        public static List<string> GetSubkeyNames(BaseKey BaseKey, string SubKey)
        {
            List<string> retVal = null;

            RegistryKey baseKey;

            if (SubKey != "")
                baseKey = _GetRegistryBaseKey(BaseKey).OpenSubKey(SubKey);
            else
                baseKey = _GetRegistryBaseKey(BaseKey);


            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                string[] names = baseKey.GetSubKeyNames();

                retVal = (from n in names
                          select n).ToList();
            }

            return retVal;
        }
        #endregion

        #region Method GetSubKeyNodeNames
        public static List<string> GetSubKeyNodeNames(BaseKey BaseKey, string SubKey)
        {
            List<string> retVal = null;

            RegistryKey baseKey;

            if (SubKey != "")
                baseKey = _GetRegistryBaseKey(BaseKey).OpenSubKey(SubKey);
            else
                baseKey = _GetRegistryBaseKey(BaseKey);


            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                string[] names = baseKey.GetValueNames();

                retVal = (from n in names
                          select n).ToList();
            }

            return retVal;
        }
        #endregion

        #region Method GetSubKeyValue
        public static object GetSubKeyValue(BaseKey BaseKey, string SubKey, string Node)
        {
            object retVal = null;
            RegistryKey baseKey;

            if (SubKey != "")
                baseKey = _GetRegistryBaseKey(BaseKey).OpenSubKey(SubKey);
            else
                baseKey = _GetRegistryBaseKey(BaseKey);


            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                retVal = baseKey.GetValue(Node);
            }

            return retVal;
        }
        #endregion

        #region Method SetKeyValue
        public static void SetKeyValue(BaseKey BaseKey, string SubKey, string NodeName, string Value)
        {
            RegistryKey baseKey = _GetRegistryBaseKey(BaseKey);
            baseKey = baseKey.OpenSubKey(SubKey, true);

            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                baseKey.SetValue(NodeName, Value);
            }
        }
        public static void SetKeyValue(BaseKey BaseKey, string SubKey, string NodeName, int Value)
        {
            RegistryKey baseKey = _GetRegistryBaseKey(BaseKey);
            baseKey = baseKey.OpenSubKey(SubKey, true);


            if (baseKey == null && SubKey != "")
            {
                throw new Exception("Registry subkey not found");
            }
            else
            {
                baseKey.SetValue(NodeName, Value);
            }
        }
        #endregion

        #region Method _GetRegistryBaseKey
        private static RegistryKey _GetRegistryBaseKey(BaseKey BaseKey)
        {
            RegistryKey key = null; ;

            switch (BaseKey)
            {
                case BaseKey.HKEY_CLASSES_ROOT:
                    key = Registry.ClassesRoot;
                    break;

                case BaseKey.HKEY_CURRENT_CONFIG:
                    key = Registry.CurrentConfig;
                    break;

                case BaseKey.HKEY_CURRENT_USER:
                    key = Registry.CurrentUser;
                    break;

                case BaseKey.HKEY_DYN_DATA:
                    key = Registry.DynData;
                    break;

                case BaseKey.HKEY_LOCAL_MACHINE:
                    key = Registry.LocalMachine;
                    break;

                case BaseKey.HKEY_PERFORMANCE_DATA:
                    key = Registry.PerformanceData;
                    break;
            }

            return key;
        }
        #endregion
    }
}

Everything makes sense in someone's mind

I have a ListView control with 4 columns set to details view. I have implemented a column sort so the user can click a column header and resort the ListView on the desired column. The default sort is column 0.

When the default view is displayed, the user can give the ListView focus, start typing, and ListView will automatically scroll the list finding matches to what is typed. Perfect!

My problem is, when they change the sort column to some other column other than the first. Typing always searches the first column only.

Does anybody know if I can change what column is searched when the keyboard is typed on a ListView control? If so, how?

Hi, guys

.
I write a simple application for drawing a vector primitives such a ellipse, line, rectangle, polygon, etc. I want to add a class for a new shape - ellipse with two lines in it, but I'm stuck on this Frown | :(

. Can you give me some help?

This is the code of my Ellipse class:

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;


namespace _2D_Vector_Graphics
{
    [Serializable]
    class EllipseShape : Shape
    {
        public RectangleF SetLocation
        {
            set
            {
                this.Location = value.Location;
                this.ModelSize = value.Size;
            }
        }

        public EllipseShape()
        {
            this.ModelSize = new SizeF(0, 0); 
            this.Location = new PointF(-10, -10);
            this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
        }

        public EllipseShape(Color newFillColor, Color newBorderColor, int newBorderWidth, SizeF newModelSize, PointF newlocation)
        {
            this.FillColor = newFillColor; 
            this.BorderColor = newBorderColor; 
            this.BorderWidth = newBorderWidth; 
            this.ModelSize = newModelSize; 
            this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
        }
        public override void DrawYourSelf(Graphics graphics)
        {
           
            GraphicsPath path=new GraphicsPath();
            path.AddEllipse(new RectangleF(Location, ModelSize));
            path.Transform(this.TMatrix.TransformationMatrix);
         
            Pen pen = new Pen(this.BorderColor, this.BorderWidth);
            
            if (IS_FILLED)
            {
                SolidBrush brush = new SolidBrush(this.FillColor);
                graphics.FillPath(brush, path);
            }
            graphics.DrawPath(pen,path);
            if (this.Selected)
            {
                this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
                this.selectionUnit.DrawYourSelf(graphics);
            }
        }
        
        public override RectangleF ReturnBounds()
        {
            GraphicsPath path = new GraphicsPath();
            path.AddEllipse(new RectangleF(Location, ModelSize));
            path.Transform(this.TMatrix.TransformationMatrix);
            return  path.GetBounds();
        }
    }
}

And this is the code of my Line class:

using System;
using System.Collections.Generic;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace _2D_Vector_Graphics
{
    [Serializable]
    class LineShape : Shape
    {
        protected Point begin,end;
        public Point SetBegin
        {
            set
            {
               begin= value  ;
            }
        }
        public Point SetEnd
        {
            set
            {
                end = value;
            }
        }
        public LineShape()
        {
            this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
        }
        public LineShape(Point begin, Point end)
        {
           
            this.begin = begin;
            this.end = end;
            this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
        }
        public LineShape(Point begin, Point end, Color newBorderColor, int newBorderWidth)
        {
            this.begin = begin;
            this.end = end;
            this.BorderColor = newBorderColor;
            this.BorderWidth = newBorderWidth;
            this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
        }

        public override void DrawYourSelf(Graphics graphics)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddLine(begin,end);
            path.Transform(this.TMatrix.TransformationMatrix);
            Pen pen = new Pen(this.BorderColor, this.BorderWidth);
            graphics.DrawPath(pen, path);
            if (this.Selected)
            {
                this.selectionUnit = new CoveringRectangle(Rectangle.Round(ReturnBounds()));
                this.selectionUnit.DrawYourSelf(graphics);
            }
        }

        public override RectangleF ReturnBounds()
        {
            GraphicsPath path = new GraphicsPath();
            path.AddLine(begin, end);
            path.Transform(this.TMatrix.TransformationMatrix);
            return  path.GetBounds();
        }
    }
}

You have an ellipse class and a line class, so you have everything you need to work with.
If you want an ellipse with two lines in it as a separate object, simply create a new third class that has an ellipse and 2 line objects as members and simply iterate over the 3 objects in the DrawYourself method.
You'll have to do some min/max calculations to do the ReturnBounds method, but that would be how I would approach it.

I wasn't, now I am, then I won't be anymore.

Can you show me with some code how to do because I could not do it.

Did you write the code above? Because if you did, you would know very easily how to do this.
If this is a homework assignment of some kind, then you need to make an honest attempt.
Try writing a new class as I described above and then ask questions based on that. You'll get loads of support here if you approach it that way. Asking us to simply give you the answer teaches you nothing and at some point, some senior dev out there who will mentor you in the workforce later on will curse us for doing so if we did.

I wasn't, now I am, then I won't be anymore.

Hi,

I am building a simple windows phone 7 app. I need to pass more that one data item between pages. I know you need to make a small change to sending one data item across but im not sure what this change is. Currently I send one item across like this:

phoneApplicationPage.NavigationService.Navigate(new Uri("/Pages/View_Stickies.xaml?string=" + info, UriKind.RelativeOrAbsolute));

Where in this case info is the string sent.

I unpack it on page 2 like this:

protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
    if (this.NavigationContext.QueryString.ContainsKey("string"))
    {
       string GPS = this.NavigationContext.QueryString["string"];
       MessageBox.Show(GPS);
    }

    base.OnNavigatedTo(e);
}

Im sure there is a very simple answer to the question and any help would be great.

Thanks

As you are passing a query string across, all you need to do is add the second key value pair after a &, so your example could become:

C#

string.Format("/Pages/View_Stickies.xaml?string={0}&id={1}", info, id)

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

Thank you very much.

You're welcome.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

Hi ,

I have array and I am try to read as a block where block start from 55 55 and end with 204 204 and within the start and the end I am read message where each message should start with 99 and end with 13 (all as a Hex) and if the message length is 30 I will do operation and if it is 6 I will do another operation.

but I am receive some exceptions when I read different bytes from different bytes.

Here's a sample from different blocks ( Which Stored In arraylist called :VopMessageDetails)

55  55  1C  09  0A  0B 
 
99  1E  3F  41  56  42  30  31  31  30  31  31  4E  4E  20  20  30  31  30  20  20  20  20  01  08  42  0B  59  CF  0D

99  1E  3F  41  56  42  30  32  31  30  31  32  4E  4E  20  20  30  32  30  20  20  20  31  02  08  93  0D  D3  CE  0D

99  0A  41  2F  01  08  E7  03  00  0D

99  1E  3F  41  56  43  30  33  31  30  31  32  4E  4E  20  20  30  33  30  20  20  20  20  03  08  58  0F  98  CE  0D

99  1E  3F  41  56  41  31  35  31  30  31  32  4E  4E  20  20  31  35  30  20  20  20  20  04  08  00  00  00  00  0D

CC  CC  

==============================================

55  55  1C  09  0A  0C  
  

CC  CC  

============================================
55  55  1C  09  0A  0D


55 55 1B 0B 0A 17 99 1E 3F 48 56 41 30 35 31 30 
32 36 4E 4E 20 20 30 35 30 20 20 20 20 01 00 32 
1E F4 D5 0D CC CC 55 55 1B 0B 0B 04 CC CC   

99  0A  41  2F  02  08  78  03  00  0D 

CC  CC  

===========================================

55  55  1C  09  0A  0E  

99  1E  3F  41  56  41  31  33  31  30  31  35  4E  4E  20  20  31  33  30  20  20  20  20  01  08  A0  0B  F7  DB  0D

99  0A  41  2F  01  08  E7  03  00  0D

99  1E  3F  41  56  42  30  31  31  30  31  35  4E  4E  20  20  30  31  30  20  20  20  20  02  08  42  0B  59  CF  0D

99  0A  41  2F  02  08  E7  03  00  0D

99  1E  3F  41  56  43  30  33  31  30  31  35  4E  4E  20  20  30  33  30  20  20  20  20  03  08  58  0F  98  CE  0D

99  0A  41  2F  03  08  E7  03  00  0D

99  1E  3F  41  56  41  30  34  31  30  31  35  4E  4E  20  20  30  34  30  20  20  20  20  04  08  DB  10  C5  CE  0D

99  0A  41  2F  04  08  E7  03  00  0D

CC  CC
================================
55 55 16 0C 0D 2B 99 1E 3F 41 56 41 30 36 31 33 
34 33 4E 4E 20 20 30 36 30 20 20 20 20 01 08 C8 
11 4E D2 0D 99 1E 3F 48 56 41 30 31 31 33 34 34 
59 59 53 34 30 34 30 43 4C 59 36 01 00 0E 1F 2C 
DA 0D 99 1E 3F 42 56 41 31 33 31 33 34 35 4E 4E 
20 20 31 33 30 20 20 20 20 01 0A D4 0E 48 DE 0D 
CC CC 55 55 16 0C 0E 13 99 1E 3F 41 56 41 30 33 
31 34 31 39 4E 4E 20 20 31 33 30 20 20 4E 20 01 
08 92 0C 64 D4 0D 99 1E 3F 41 56 41 30 38 31 34 
31 39 4E 4E 20 20 30 38 30 20 20 20 20 02 08 90 
11 EA D6 0D CC CC

and here's My code

<br />
     #region 1: Count Numbers of blocks.<br />
                int blockCounter = 0;<br />
                int countNumberOfBytes = 0;<br />
                for (int i = 0; i < VopMessageDetails.Count; i++)<br />
                {<br />
                    if (VopMessageDetails[countNumberOfBytes].ToString() == "85")<br />
                    {<br />
                        /* <br />
                         * I am use this loop becasuse the first byte is not 204<br />
                         * so it will through expection so I make it go to first condition<br />
                         * till it reach to the require condition which is else if condition.<br />
                        */<br />
                    }<br />
                    else if (VopMessageDetails[countNumberOfBytes].ToString() == "204" & VopMessageDetails[countNumberOfBytes - 1].ToString() == "204")<br />
                    {<br />
                        blockCounter++;<br />
                    }<br />
                    countNumberOfBytes++;<br />
<br />
                }<br />
                Console.WriteLine(blockCounter);<br />
                #endregion<br />
<br />
                // 2 : Read Each Block As Alone.<br />
<br />
<br />
<br />
<br />
                // To Store Each block in catchBlockBytes Array where each Index represent a block.<br />
                List<string>[] catchBlockBytes = new List<string>[blockCounter];<br />
                //After we Determine Number of Block to catchBlockBytes , Reassignment blockCounter to Zero to set index of each object step by step.<br />
                blockCounter = 0;<br />
                catchBlockBytes[blockCounter] = new List<string>();<br />
<br />
                // To Get the Number of Previous Bytes.<br />
                int PrevBlockCounter = 0;<br />
<br />
                // Catch Each Block.<br />
                for (int k = 0; k < VopMessageDetails.Count; k++)<br />
                {<br />
                    if (VopMessageDetails[0 + PrevBlockCounter].ToString() == "85" & VopMessageDetails[1 + PrevBlockCounter].ToString() == "85")<br />
                    {<br />
                        if (VopMessageDetails[k].ToString() != "204")<br />
                        {<br />
                            catchBlockBytes[blockCounter].Add(VopMessageDetails[k].ToString());<br />
                        }<br />
                        else<br />
                        {<br />
                            // I am 2 to K because the previous if condtion will not add the last 2 bytes ( 204 and 204)<br />
                            // So I am add 2 to start again from 85 and continue with condition.<br />
                            PrevBlockCounter = k + 2;<br />
                            // blockCounter++;<br />
                            k++;<br />
<br />
                            if (VopMessageDetails[PrevBlockCounter - 1].ToString() == "204" & VopMessageDetails[PrevBlockCounter - 2].ToString() == "204")<br />
                            {<br />
                                blockCounter++;<br />
                            }<br />
<br />
<br />
                            // Condition Target : to stop add new object as a item if there is no bytes. <br />
                            if (k != VopMessageDetails.Count - 1)<br />
                            {<br />
                              catchBlockBytes[blockCounter] = new List<string>();   <br />
                            }<br />
<br />
                        }<br />
                    }<br />
<br />
<br />

Why are you converting byte values to strings to test for numeric equality? Just test against the decimal or hex value.

And please use <pre></pre> tags not <code></code> to surround your code blocks; that is why the button is called "code block".

Just say 'NO' to evaluated arguments for diadic functions! Ash

Hi,

your code is hard to read, you should use PRE tags instead of CODE tags, as that would preserve formatting and indentation.
You also should HTML-escape the < and > and & signs, possibly using the widgets the edit page offers. That way the generic lists would show properly. You could still edit and improve the existing message.

Here are some comments:

1.
When the data is numeric, it is just silly to convert it to string for comparison purposes. You really should be using something like

if (myIntOrMyByte==0x55)...

and not mix decimal and hexadecimal all the time. C# knows about hex literals!

2.
Is this an official standard you're implementing? I'm not familiar with double 0x55 and double 0xCC as special markers. And what makes one so sure they will never appear in the data?

3.
If you're getting exceptions, you should watch the stack traceback; for a debug build it holds class names, file names *and* line numbers, pointing to the exact line that bombs. And if you can't figure it out, show the exact exception message and indicate the line where it happens.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Season's Greetings to all CPians.

What exceptions are you receiving? If you could elaborate it may help get the root of the problem.

"Simplicity carried to the extreme becomes elegance."
-Jon Franklin

when I have block start with 55 55 but not content any message and end with with 204 204

like this
55 55 1C 09 0A 0C

CC CC

and like those

55 55 1B 0B 0A 17 99 1E 3F 48 56 41 30 35 31 30
32 36 4E 4E 20 20 30 35 30 20 20 20 20 01 00 32
1E F4 D5 0D CC CC 55 55 1B 0B 0B 04 CC CC

99 0A 41 2F 02 08 78 03 00 0D

CC CC

Yes that's fine.
But what error message or exception do you get?
Or do you not get an error where you expected one?

If you won't help us, we can't help you.

What is the error?

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Let me get this straight, because I think there are language barriers here. In reference to your example data... a 'BLOCK' is considered everything between 0x55 and 0xCC right? If this is the case, then a couple of your example data sets have multiple blocks. Luc is right in his previous post that data has to escape the fencepost identifiers if they appear inside the payload. And the issue is that your dividing into BLOCKS is not working as expected? No exceptions, just not valid results, ya?

"Simplicity carried to the extreme becomes elegance."
-Jon Franklin