C# Discussion Boards - CodeProject

Lapje7-Sep-05 5:19

7-Sep-05 5:19

Does someone have experience reading WM_INPUT info? I already know I need to use user32.dll, I only have no idea HOW. There are masses of tutorials in c or c++ on this subject, but just a few in C#. I'm a programmer newbe, so I like code with some explanation Big Grin | :-D

Thanks in advance.

Composite Key constraint logic

Anonymous7-Sep-05 3:36

Anonymous

7-Sep-05 3:36

Can somebody tell me the best way to implement the logic similar to SQL Composite Key Constraint.

Re: Composite Key constraint logic

Guffa7-Sep-05 4:09

Guffa

7-Sep-05 4:09

Where do you want to implement this?

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b { font-weight: normal; }

Re: Composite Key constraint logic

Anonymous7-Sep-05 6:36

Anonymous

7-Sep-05 6:36

I have an array of objects of a class having 10 fields. The first 5 fields should behave like composite keys of a sql table. So only objects conforming to the constraint can be added.

I know that this can be achieved using DataSets and DataRelations. I dont want to use it.
I just need a simple logic to implement this in an ArrayList.

Re: Composite Key constraint logic

Guffa8-Sep-05 11:35

Guffa

8-Sep-05 11:35

Slow method:

Loop through all the records and compare the values in the fields to the new values you want to add.

Fast method:

Create a hash value for the fields and store in the object. Create a hash value for the new values and loop through the records and look for the hash value.

Even faster method:

Use a hash table instead of an array, create a composite value of the fields and use as key in the hash table. Create a composite value of the new values and check if it exists in the hash table.

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b { font-weight: normal; }

Targeting a Framework version?

bosfan7-Sep-05 1:40

bosfan

7-Sep-05 1:40

Hi community,
i cteate an application on win xp prof. with frameworks 1.0,1.1 and 2.0 Beta, and there r no errors on machines with framework 2.0, but only if i try to install them to an machine with framework 1.1 or 1.0 i got an error that i need framework version 2.0! How can i target an framework version that is installed on the current machine??? is this posible??? i use VS .Net 2005! i try to change the version in the setup->lauch conditons->version = 1.1.4322 but they dont work?! Confused | :confused:

when i change all references from 2.0 to 1.1 i recive an error like this:
"System.BadImageFormatException: The format of the file 'Installer.exe' is invalid"

Any suggestions for me?
Thanx for help!

mirso

-- modified at 8:24 Wednesday 7th September, 2005

hours minutes seconds

PHDENG817-Sep-05 1:27

PHDENG81

7-Sep-05 1:27

I have a textbox that needs to accept the format: 00:00:00

I would like for the format to be "Locked." Therefore, forcing the user to keep the values in this format. For example, when the textbox shows up, it automatically displays 00:00:00. And the user MUST put values in each place or leave them "0." I took a look at the DateTime method. However, it doesn't seem to do what I am looking for. Also, all values entered can only be 0 - 9. Thanks in advance.

D

Re: hours minutes seconds

John Fisher7-Sep-05 7:06

John Fisher

7-Sep-05 7:06

What you are looking for is a "masked edit control". Searching here at CodeProject or on Google will list many of them!

John

"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.

Re: hours minutes seconds

machocr7-Sep-05 11:43

machocr

7-Sep-05 11:43

I can aso use rgular esxpressions whit the System.Text.RegularExpressions.RegEx.Ismatch method.
Here is one string pattern to use: "^(20|21|22|23|[01]\d|\d)(([:.][0-5]\d){1,2})$"
You can see more at: http://www.regexlib.com/DisplayPatterns.aspx[^]

Happy coding! Suspicious | :suss:

La realidad no es más que impulsos eléctricos del cerebro - Morpheus

How to install a snapin for MMC 2.0??

Socket_Layer7-Sep-05 0:34

Socket_Layer

7-Sep-05 0:34

Hello,

Is there a way to create a working installer for a snapin? I've created a snapin but I can't create a working installer Frown | :(

Has one of you guys ever delt with this problem? Is there a solution?
10x guys

Larry

--

Can FolderBrowserDialog be extended?

Socket_Layer7-Sep-05 0:29

Socket_Layer

7-Sep-05 0:29

Hello,

I have a question regarding the inheritance of a sealed class. I would really want to know if it is possible inherit from FolderBrowserDialog. I want to extend the FolderBrowserDialog to do some checkings of the selected folder and to enable/disable the OK button. How can I do that in C#?

Larry

Finding Excpetion Line Number

Tiger4567-Sep-05 0:27

Tiger456

7-Sep-05 0:27

Hai

Is there any way to find the line number & Source code that cause excpetion.

i mean in the code i need to get these things in seperate variables.

string linenumber = 'line number'
string expCode = ' code that leads to exception'

Thanks and Regards

Re: Finding Excpetion Line Number

Mohamad Al Husseiny7-Sep-05 7:03

Mohamad Al Husseiny

7-Sep-05 7:03

You can get this information from Exception.ToString()if you look to the end of the string you will see somthing like form1.cs:line 524 so to get line number you can write code in your exception handling code somthig like

catch(Exception ex)
{
	string strExc=ex.ToString();
	int pos=strExc.IndexOf(":line",0);
	if(pos != -1)
	{
		MessageBox.Show(strExc.Substring(pos+5,strExc.Length-(pos+5)));
	}
}

Note: in relase mode this inoformation will not generated to enable it in your project Build configration check Generate debugging information look at Printing Line Number with an exception in Release Mode[^] for more informaton

MCAD

-- modified at 13:04 Wednesday 7th September, 2005

Createprocewwwithlogonw & .NET 2.0

Ruchirdhar6-Sep-05 23:25

Ruchirdhar

6-Sep-05 23:25

Hi All,
I was just wondering how to invoke a process under different security context with the specified credentials over network only, I used P/Invoke to call CreatProcessWithLogonW but since I had to use it with ASP.NET application p/Invoke was failing though It was working fine with Desktop application (Probably due to some security problems of IIS), I came to know that in .net2.0 things are pretty simple and I need to call only Static member Start of Process class by passing credentials but this is not invoking process instead I am getting error logon failure, I suppose this problem is becuase I don't know how to set logon flags which we could set in createprocesswithlogonw function..Can anyone tell me how to start a process using the specified credentials on the network only in .net2.0.

Regards,
Ruchir Dhar Dwivedi
Software Engineer
5th floor Marisoft, Cybage Software Pvt. Ltd., Kalyani Nagar, PUNE - 4 1 1 0 0 6, I N D I A
Phone(O) : 91-20-56041700,91-20-56044700 Extn 830 | AIM : RuchirAIM | cell : 09890939702
mail to : ruchird@cybage.com | www.cybage.com

set the input for a text box from addition class.

cue_ball6-Sep-05 22:32

cue_ball

6-Sep-05 22:32

Sorry guy, im new in c#
Im using vs.net
Is there a way to update the input of a text box from a class that not in the main form1.cs? my additional class is suppose to update a status text box when a msg is sent.. any hint guys?
I suck at coding and only familar with C.. now trying out c#

string test=("listening:");
Form1.StatusText= test;//string.Copy("Listening..:");

Re: set the input for a text box from addition class.

Ashok Dhamija6-Sep-05 23:11

Ashok Dhamija

6-Sep-05 23:11

It is possible to update the text of a text box in the main form from another class in the application. Proceed something like this…

string test = "Listening:";

// Get the instance of the main form called "Form1"(presuming that it is the currently active form)
Form currentForm = Form.ActiveForm;

//Set the text of the textbox (named "StatusText") on the main form
((Form1)currentForm).StatusText.Text = test;

Regards,
Ashok Dhamija
_____________________________
Padam Technologies

-- modified at 5:12 Wednesday 7th September, 2005

Re: set the input for a text box from addition class.

cue_ball6-Sep-05 23:54

cue_ball

6-Sep-05 23:54

C:\Documents and Settings\Desktop\C# CLASS\ClientWithDialog\cApplication.cs(29): The name 'currentForm' does not exist in the class or namespace 'ClientWithDialog.cApplication'
C:\Documents and Settings\Desktop\C# CLASS\ClientWithDialog\cApplication.cs(28): The type or namespace name 'Form' could not be found (are you missing a using directive or an assembly reference?)

This are my error..

The situtation is this.. i got a console program. which im tryin to rewrite into a application base one.

it a simple tcp/ip program
where by the StatusText textbox is suppose to change according to what the class throw at..

example when connected..( procedure in class)
it suppose to update the status text box in the form i created.

hope for some hint

Re: set the input for a text box from addition class.

Ashok Dhamija7-Sep-05 0:11

Ashok Dhamija

7-Sep-05 0:11

As you had not mentioned that it is a console application and as you had referred to your main Form as Form1 in your sample code, I had presumed that you are using a Windows Forms application. In a forms application, the error mentioned by you is due to the missing "using" statement. Use the following "using" statement at the top of the class coding:

using System.Windows.Forms;

But, in the situation described by you, and to the extent I could understand your problem, you should have the reference to the instance of Form1 on which the "StatusText" textbox lies, and then may simply use code like this:

string test = "Listening:";
Form1.StatusText.Text = test;

Hope it works.

Regards,
Ashok Dhamija
_____________________________
Padam Technologies

Re: set the input for a text box from addition class.

cue_ball7-Sep-05 15:10

cue_ball

7-Sep-05 15:10

Thanks man.. i actually did try that and the error was

private System.Windows.Forms.TextBox StatusText;

there for i change the PRIVATE to PUBLIC..
and then the error was.

C:\Documents and Settings\Desktop\ClientWithDialog\cApplication.cs(28): An object reference is required for the nonstatic field, method, or property 'ClientWithDialog.Form1.StatusText'

Therefor i try
Form1.StatusText.Text = test;
and
ClientWithDialog.Form1.StatusText.Text = test;

sorry for all the trouble. hope for so advice..
thanks again

Get data from Com Port

quocbao6-Sep-05 20:36

quocbao

6-Sep-05 20:36

The present I'm making application so get data from com port which write by C#
But I don't know ! Help me
Everyone can send for me Example.
Thank you very much!

Re: Get data from Com Port

Russell Jones6-Sep-05 23:02

Russell Jones

6-Sep-05 23:02

http://www.codeproject.com/dotnet/DotNetComPorts.asp

has some info on this,

HTH

Russ

Updating data in Form A from form B?

Johan Glysing6-Sep-05 20:17

Johan Glysing

6-Sep-05 20:17

Hi, im pretty new to c# and have a data management question.
I have a windows application and 2 forms.
Form A is the main application form and form B is opened from form A and contains
a CheckedListBox with 5 selections.

Now my problem is that when ive checked my coices and close form B, i need to get the data from form B and update some events based on the choices in form A.

I opened an instance like this:

GetForm getForm = new GetForm();
getForm.Show();

But i guess i have to have a check like this:
if (getForm.ClickedOK() == true) { process data }

And some way to retrieve the checkedlists to read them in form A.
Also, how can i show form B in a modal way?

Thanks in advance
/Johan

Re: Updating data in Form A from form B?

Gavin Jeffrey6-Sep-05 22:21

Gavin Jeffrey

6-Sep-05 22:21

ok to show the form in a modal way use ShowDialog() instead of Show().
To get the values of B into A you could try something like -
//in FormA code
FormB fb = new FormB(this); //pass FormA object as a parameter to FormB
fb.ShowDialog();

//in FormB code
private void getForm_Ok_buttonClick(object o,eventArg e)
{
FormA.requiredValues = FormB.checkedValues;
}

Re: Updating data in Form A from form B?

Johan Glysing6-Sep-05 22:40

Johan Glysing

6-Sep-05 22:40

Thanks.

Although i tried to pass the main form before as an object the compiler wont allow it since its read-only (i must pass it as a ref).

I COULD pass form A´s items separately to be updated to form B,
but it involves over 40 textfields and it would get pretty ugly.

Any other ideas?

Re: Updating data in Form A from form B?

Ashok Dhamija6-Sep-05 23:26

Ashok Dhamija

6-Sep-05 23:26

I am putting a slightly modified form of the code submitted in another reply to your query, and I think it should solve your problem:

//Call FormB from the code in FormA like this
FormB fb = new FormB();
DialogResult result = fb.ShowDialog();

//Check if FormB is closed by using OK button on it
if(result == DialogResult.OK)
{
   FormA.requiredValues = FormB.checkedValues;
}

Regards,
Ashok Dhamija
_____________________________
Padam Technologies

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