Re: Socket Programming - C# Discussion Boards

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Re: Binary Validation File

Mycroft Holmes2-Jun-13 11:53

Mycroft Holmes

2-Jun-13 11:53

This is an age old issue and there are entire libraries written about it, only you can define the requirements but you need to manage all the scenarios of your clients. What happens when they want to install a new machine? What happens if a system goes tits up and needs to be replaced? No internet?

Asking a question in forum does not represent research and you will need to do some o this subject.

Never underestimate the power of human stupidity
RAH

Re: Binary Validation File

BobJanova3-Jun-13 4:08

BobJanova

3-Jun-13 4:08

In principle it's simple, hash a few machine specific things (MAC address, hard drive serial number etc) which you can get with P/Invoke calls, and park it in a known location.

Your problem will come in trying to protect the known location and hash algorithm, if you want something that's even vaguely crack proof.

The best implementation of this for most applications is 'ask your users nicely to respect the licence agreement', frankly.

Socket Programming

itprs2-Jun-13 4:58

itprs

2-Jun-13 4:58

Hi.what Is Best Book For Socket Programming With C#?

Re: Socket Programming

Dave Kreskowiak2-Jun-13 7:45

Dave Kreskowiak

2-Jun-13 7:45

The one YOU can read and understand. What I consider the "best" book and what you consider the best book will be two very different things.

Start browsing Amazon[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Socket Programming

Septimus Hedgehog3-Jun-13 2:01

Septimus Hedgehog

3-Jun-13 2:01

itprs,

Adding to Dave K's comments there's one book I've found to be a good introduction. Om Amazon:

Tcp/ip sockets in c# by makofske, donahoo, calvert

Isbn-13: 978-0-12-466051-9
Isbn-10: 0-12-466051-7

It's a good book. As they say, YMMV. Smile | :)

If there is one thing more dangerous than getting between a bear and her cubs it's getting between my wife and her chocolate.

Re: Socket Programming

Pete O'Hanlon3-Jun-13 2:27

Pete O'Hanlon

3-Jun-13 2:27

By replying to Dave, itprs doesn't get notified that you've added a message.

I was brought up to respect my elders. I don't respect many people nowadays.

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Re: Socket Programming

Septimus Hedgehog3-Jun-13 3:20

Septimus Hedgehog

3-Jun-13 3:20

Quite correct, Pete. I overlooked that... Smile | :)

If there is one thing more dangerous than getting between a bear and her cubs it's getting between my wife and her chocolate.

Re: Socket Programming

Septimus Hedgehog3-Jun-13 3:22

Septimus Hedgehog

3-Jun-13 3:22

Repost of my reply below for your attention:

itprs,

Adding to Dave K's comments (below) there's one book I've found to be a good introduction. Om Amazon:

Tcp/ip sockets in c# by makofske, donahoo, calvert

Isbn-13: 978-0-12-466051-9
Isbn-10: 0-12-466051-7

If there is one thing more dangerous than getting between a bear and her cubs it's getting between my wife and her chocolate.

C# Fill comboBox with DB content

tizziCerutti2-Jun-13 1:45

tizziCerutti

2-Jun-13 1:45

I want to Bind two Columns and populate a ComboBox with it in C#..My code is printing just one. the FirstName. Have tried concatenating the LastName with it but its not working. Can anyone show me how to go about it. Here is my code. Thanks

OleDbCommand cmd = new OleDbCommand("SELECT * FROM ADb", myCon);
           OleDbDataAdapter d = new OleDbDataAdapter(cmd);
           d.SelectCommand.CommandText = cmd.CommandText.ToString();

           DataTable dt = new DataTable();
           d.Fill(dt);
           cmbNames.DataSource = dt;
           cmbNames.DisplayMember = "FirstName";

Re: C# Fill comboBox with DB content

Boipelo2-Jun-13 2:20

Boipelo

2-Jun-13 2:20

You meant two rows? Whats the other value you want to bind or data in your table? If it the ID add it as Value Member

cmbNames.ValueMember = "id";

Bombo box will bind row by row from your table.

I remain joe!

Re: C# Fill comboBox with DB content

Anna King3-Jun-13 2:47

Anna King

3-Jun-13 2:47

You have just provided the code and query for the Firstname, please provide the same code for Lastname too.

Re: C# Fill comboBox with DB content

BobJanova3-Jun-13 4:12

BobJanova

3-Jun-13 4:12

One approach is to retrieve the data in the format you want:

OleDbCommand cmd = new OleDbCommand("SELECT id, FirstName + ' ' + LastName as Name FROM ADb", myCon);
OleDbDataAdapter d = new OleDbDataAdapter(cmd);
d.SelectCommand.CommandText = cmd.CommandText.ToString();
 
DataTable dt = new DataTable();
d.Fill(dt);
cmbNames.DataSource = dt;
cmbNames.DisplayMember = "Name";

I took a guess at the name of your ID column. You still need to select that if you use the combo for selecting things elsewhere.

Re: C# Fill comboBox with DB content

tizziCerutti10-Jun-13 21:55

tizziCerutti

10-Jun-13 21:55

Thanks BobJanova. Thanks Everyone...

Re: C# Fill comboBox with DB content

Amol_B4-Jun-13 19:41

Amol_B

4-Jun-13 19:41

You can append two columns in SQL query and use that column as display Member

SQL

SELECT Firstname + ' ' + Lastname,* FROM ADb

[Solved] Binding to data that will be resloved asyncronously

AlphaDeltaTheta1-Jun-13 3:18

AlphaDeltaTheta

1-Jun-13 3:18

Hi all,
Just got a view and a viewmodel to wire-up. The view needs to be bound to some properties that will be resolved asyncly after the execution of a certain command.

Ok, I wrote all the stuff but now i'm confused with how to declare the binding???
Any ideas????

Here's just a skeleton
View -
initially just a textbox and a ok button. On clicking the ok button, the results are displayed and the command to resolve values are sent to the viewmodel.

In viewmodel,

public class MainViewModel : ViewModelBase<MainViewModel>
{

	//properties that are to be resolved

	private string _data;
	private int _time;

	public string Data
	{
		get
		{
			return _data;
		}
			set
		{
			_data = value;
			NotifyPropertyChange("Data");
		}
	}

	//and so on...
}

I need the value of a Textblock to be bound with "Data". But that will be resolved after a while...
Out of ideas! Confused | :confused:

Please help.

modified 4-Jun-13 12:51pm.

Re: Binding to data that will be resloved asyncronously

Abhinav S1-Jun-13 7:35

Abhinav S

1-Jun-13 7:35

Try <textblock text="{Binding" data}=""> from within the view.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Binding to data that will be resloved asyncronously

AlphaDeltaTheta1-Jun-13 15:22

AlphaDeltaTheta

1-Jun-13 15:22

XML

<Textblock Text="{Binding Data}" />

This will be enough? D'Oh! | :doh:

so simple!

Ofcourse, the confusion was that it was to be resolved asyncly.

Re: Binding to data that will be resloved asyncronously

Anna King3-Jun-13 2:55

Anna King

3-Jun-13 2:55

I am still not getting it, how exactly do you want to bind your data with the ViewModel.

Re: Binding to data that will be resloved asyncronously

BobJanova3-Jun-13 4:14

BobJanova

3-Jun-13 4:14

Binding to that property in the normal way should work fine. Data binding is essentially asynchronous all the time, in that the view's updated by notification events and not directly by code, so it should work just the same.

Make sure that the VM sends a value that the view can deal with before the asynchronous call returns, though (this might mean making the view accept null).

Re: Binding to data that will be resloved asyncronously

AlphaDeltaTheta3-Jun-13 17:15

AlphaDeltaTheta

3-Jun-13 17:15

Thank you,

Here's my solution,

XML

<Textblock x:Name="result" Text="{Binding Data, TargetNullValue=Loading..." />

C# Project On Image Processing

Bishwajit Nepali31-May-13 23:47

Bishwajit Nepali

31-May-13 23:47

My final year project is to find the distance and height of image from camera(webcam). Is there some way in C# to find the angle of pointing image from the camera ? Please help me I have few time only

bishwazeet

Re: C# Project On Image Processing

Eddy Vluggen1-Jun-13 11:05

Eddy Vluggen

1-Jun-13 11:05

Bishwajit Nepali wrote:
Please help me I have few time only

One can't build a castle in a day. You're lucky though; we have an article[^] on images and distances.

For an angle, one would need a reference-point.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: C# Project On Image Processing

Bishwajit Nepali24-Sep-13 8:29

Bishwajit Nepali

24-Sep-13 8:29

Thnx but I did using the reference point .Thanks for ur suppoort

Re: C# Project On Image Processing

Anna King3-Jun-13 3:00

Anna King

3-Jun-13 3:00

The concept that you are talking about is like a program that can't be developed within a day.

Re: C# Project On Image Processing

Pete O'Hanlon3-Jun-13 3:23

Pete O'Hanlon

3-Jun-13 3:23

The way to solve this is to use some maths, and it requires you knowing how high off the ground the web camera is. Once you know this, you need to measure the angle to the base of the object to work out the distance. From this, it's a fairly simple set of calculations to work out the height (as long as you know the angle to the top of the object).

I was brought up to respect my elders. I don't respect many people nowadays.

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Last Visit: 31-Dec-99 18:00 Last Update: 23-Apr-24 3:40

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