C# Discussion Boards - CodeProject

Christian Graus5-Jul-07 3:55

5-Jul-07 3:55

StevenWalsh wrote:
and the exception message is: "Object reference not set to an instance of an object"

You're bound to get that when you chain together calls without first checking the return values. I'd assume that OpenSubKey is failing, but you should step through and check it yourself, and write more defensive code in future.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

NassosReyzidis5-Jul-07 3:56

NassosReyzidis

5-Jul-07 3:56

Hello Steven,
either the RemoteKey is null or
the "RemoteKey.OpenSubKey("SOFTWARE\\Twrap\\Packages\\Completed", RegistryKeyPermissionCheck.ReadSubTree)" is null

change your code from:

RegistryKey RemoteKey;<br />
string RemoteComputer = LabName + "isp0001";<br />
RemoteKey = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, RemoteComputer);<br />
string value = RemoteKey.OpenSubKey("SOFTWARE\\Twrap\\Packages\\Completed", RegistryKeyPermissionCheck.ReadSubTree).GetValue("1.3", 0).ToString();

to:

RegistryKey RemoteKey;<br />
RegistryKey RemoteSubKey;<br />
string value;<br />
string RemoteComputer = LabName + "isp0001";<br />
RemoteKey = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, RemoteComputer);<br />
if (RemoteKey != null)<br />
{<br />
     RemoteSubKey = RemoteKey.OpenSubKey("SOFTWARE\\Twrap\\Packages\\Completed",RegistryKeyPermissionCheck.ReadSubTree);<br />
     if (RemoteSubKey != null)<br />
     {<br />
          value = RemoteSubKey.GetValue("1.3", 0).ToString();<br />
     }<br />
}<br />
if (value != null && value.Length>0)<br />
{<br />
   //The SubKey exist do your staff with the value<br />
}

GanDad

StevenWalsh5-Jul-07 4:09

StevenWalsh

5-Jul-07 4:09

Hi, i've tried your code, and i'm still getting the exception here is where it is stopping

RemoteKey = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, RemoteComputer);

Christian Graus5-Jul-07 4:22

5-Jul-07 4:22

Breaking it down will just help you work out where the problem is. It won't change that you are making a call which is returning null, and not checking it.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

StevenWalsh5-Jul-07 4:42

StevenWalsh

5-Jul-07 4:42

Christian Graus wrote:
Breaking it down will just help you work out where the problem is. It won't change that you are making a call which is returning null, and not checking it.

i broke it down some more and narrowed to problem down to the string "value" i made value an object datatype and it now works.

user id,password.etcc..

myat_035-Jul-07 3:05

myat_03

5-Jul-07 3:05

this is the problem

Create a User class. This class should at least contain the following fields:
User ID
Password
First Name
Last Name
E-mail Address
Status - valid values are 'Inactive', 'Active', 'Deleted'
Define constructors that accept the following parameter lists:
All parameters: User ID, Password, First Name, Last Name, E-mail Address, Status
User ID, Password and E-mail Address
User ID and Password Only
** The status field should be initialized to 'Active' upon creation
** Constructors 2 and 3 should use a constructor initializer

Define read-only properties that return the following:
IsActive – whether or not the account's status is active
FullName – a concatenation of the account's first and last names
Define additional properties that behave as follows:
UserID
Set operation should ensure the user id does not start with a digit and should only update the user id field if the given value is valid
Get operation just returns the user id
Password

pls help me... Cry | :((

just notify me through my email...

......

originSH5-Jul-07 3:10

originSH

5-Jul-07 3:10

Thats a nice specific specification so just impliment it.

You need only the most basic knowledge of c# to achive this.

myat_035-Jul-07 3:25

myat_03

5-Jul-07 3:25

i am in a short period of time and i do have problem on my computer..i can't practice now..i find source of this project and i try this site that someone could help me to this problem..

......

originSH5-Jul-07 3:36

originSH

5-Jul-07 3:36

So because it's got to be handed in soon and you didn't do it in time you want someone else to do it for you?

Christian Graus5-Jul-07 3:56

5-Jul-07 3:56

every homework request comes with a sob story. This is really straight forward. If you try to do it yourself and you need help with specific things, that's different, but for you to just post your homework and hope someone will do it is, frankly, kind of rude.

So, I ask again, which specific bits are confusing you ? Do you want to ask some specific questions to help you in approaching this task ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Christian Graus5-Jul-07 3:19

5-Jul-07 3:19

Which part of your (pretty simple) homework is confusing you ? This is a basic exercise in OO. We never do homework, but this in particular, is pretty vital for you to understand, and really not hard.

I would guarentee that any text you've been assigned will cover all you need to know to do this.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Change column title in DataGrid

Paul Conrad5-Jul-07 6:02

Paul Conrad

5-Jul-07 6:02

This is very straightforward and do your own homework. People will help with a specific problem you may have, but not do your homework for you Big Grin | :-D

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

Muhammad Gouda5-Jul-07 2:20

Muhammad Gouda

5-Jul-07 2:20

My table contains fields like (empId, empName,...)
And when I load my table to a DataGrid, the columns' titles become the sames as fields names in my table.
I need to assign them new titles (e.g. Employee ID, Employee Name, ...)
Anybody can help?

Mohamed Gouda
Egypt

Re: Change column title in DataGrid

kubben5-Jul-07 2:28

kubben

5-Jul-07 2:28

I wrote an article that shows how to do this in .net 1.1
http://www.codeproject.com/useritems/DataGrid_TableStyles.asp[^]

Hope that helps.
Ben

Re: Change column title in DataGrid

Muhammad Gouda9-Jul-07 21:21

Muhammad Gouda

9-Jul-07 21:21

Many Thanks
I expected more effort is needed for this. But it was so easy Big Grin | :-D

Mohamed Gouda
Egypt

mp3 seek [modified]

tradakad5-Jul-07 2:09

tradakad

5-Jul-07 2:09

Hello ALL!

I have an xml file like this

<files>
<item>
<name>file1.mp3</name>
<seeks>
<seek>
<desc>First seek in first file</desc>
<pos>12</pos>
</seek>
<seek>
<desc>Second seek in first file</desc>
<pos>24</pos>
</seek>
<seek>
<desc>Third seek in first file</desc>
<pos>29</pos>
</seek>
</seeks>
</item>
<item>
<name>file2.mp3</name>
<seeks>
<seek>
<desc>First seek in second file</desc>
<pos>10</pos>
</seek>
<seek>
<desc>Second seek in second file</desc>
<pos>25</pos>
</seek>
</seeks>
</item>
</files>

and I have some mp3 files.

how can I play that files from 1st seek to 2nd seek ? information about seeks I will get from xml

thanx!

-- modified at 8:29 Thursday 5th July, 2007

--
"Success is simple. Do what's right, the right way, at the right time."

best regards,
tradakad

Christian Graus5-Jul-07 2:19

5-Jul-07 2:19

You need to check 'Ignore HTML tags in this message (good for code snippets)' for your XML to be properly rendered. The schema is irrelevant, however. You can use anything you like to play the mp3, be it DirectSound, the Windows Media Player control, etc. I don't believe any of those things offer the ability to play part of a track, but they all let you set the position in the track, so it's a case of setting a timer so you can stop it when the section ends.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

tradakad5-Jul-07 2:42

tradakad

5-Jul-07 2:42

Thanx! so I need set a posintion (firstPos) in the file, play it for (firstPos - secodPos) seconds?
but how can I explain for control to play only (firstPos - secodPos) seconds? is any property for this in the control?

--
"Success is simple. Do what's right, the right way, at the right time."

best regards,
tradakad

Christian Graus5-Jul-07 2:53

5-Jul-07 2:53

tradakad wrote:
but how can I explain for control to play only (firstPos - secodPos) seconds? is any property for this in the control?

As I said, no. You can set the position, but not the end position. So, you need to set a timer that goes off as you hit the end position, so you can move the position or stop it.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

tradakad5-Jul-07 3:25

tradakad

5-Jul-07 3:25

aha.. timer. i see.
thanx! I'll try!

--
"Success is simple. Do what's right, the right way, at the right time."

best regards,
tradakad

Process problems

SilvermanDK5-Jul-07 2:01

SilvermanDK

5-Jul-07 2:01

Hi,

I have some problems while using a Process to start an Microsoft Active Sync installation.
I am developing an Installer program(In .Net 1.1) to install some different programs in an certain order.

But when installing Microsoft Active Sync from the Installer program the user is promted to restart the computer after succesfull install(Default by Microsoft). If the user press "Yes",
I need to be sure that the Installer Program & the Process are closed because else there will occur an error.

I have tried to use Process.WaitForExit and then this.Close(), but that did not work

I Also need to do a "check" in the registry database, to see if the user has canceled the Install(Then he needs to be promted if he want's to install again), or the install was succesfull but the user did not want's to restart the computer

Regards
Mikkel Hansen

Online Radio

atulonweb@hotmail.com5-Jul-07 1:36

atulonweb@hotmail.com

5-Jul-07 1:36

Hi EveryBody

I am trying to make Online Radio untily in dot net.do anybody have any idea From where to start.
I am Cliking with any idea.

Thanks

Atul Kumar

Re: Online Radio

Christian Graus5-Jul-07 2:20