Re: user's current wallpaper - C# Discussion Boards

Yes, you can use a calculated column. For example:

DataTable table;
table = .... // Get from the database however you do it (data adapter)?

table.Columns.Add("TextStatus", typeof(string), "IIF(Status = 1, 'Administrator', 'User')");

For more things you can do with calculated columns, check DataTable.Expression[^]

I hope this helps! Smile | :)

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

My Blog!

Can you try this in your SQL statement when retrive the data:

SELECT
....
StatusValue = CASE WHEN Status = 1 THEN 'Administrator' ELSE 'User' END
FROM
...

Not sure this answer your question?

Eliz.K

Hi All,

This is Windows Forms, not web.

I've got a class, who's properties are normally exposed to my users in a PropertyGrid control.

Some of the properties have attributes from the System.ComponentModel namespace to hide, force read only, or rename attributes (DisplayName, ReadOnly, Browsable etc).

Now, for some users (those with a superuser access), I need to expose some of the hidden properties, in a DataGridView.

But the attributes are causing problems... When I bind a DataGridView to a List<t> of my objects, only the columns shown in the PropertyGrid are shown.

Even if I disable automatic column generation, and try to manually create columns, like this:-

dataGridView1.AutoGenerateColumns = false;
dataGridView1.DataSource = my List<T>;

DataGridViewColumn column = new DataGridViewTextBoxColumn();
column.Name = "Column Name";
column.DataPropertyName = "HiddenProperty";
dataGridView1.Columns.Add(column);

The created column simply comes out blank.

Does anyone know a way round this? Other than (of course) losing the databinding functionality and filling the DataGridView manually?

Thanks

Jon

using System.Beer;

Hi Jon

This is just a shot in the dark, but have you looked into AttributeProvider[^]?

Tech, life, family, faith: Give me a visit.
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Judah Himango

Guys,
How can I access a shared secured folder from code (VB/C#) that will not show the UserName/Password dialogue box?

Thank you

ThaScorpion

ThaScorpion

If the account your code is running under isn't recognized by the server, you MUST supply a username and password to it in order for it to let you into the Share. You simply have no way around this.

You can find an example of logging into a remote server here[^].

If you don't have appropriate credentials recognized by the remote server, you're outta luck until you get an account that IS recognized.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

How do I get the user's current wallpaper bitmap? (keeping in mind that the user might have set the wallpaper with either the desktop properties control panel applet, or with the SetParametersInfo method in user32.dll) Is there an API call that returns a bitmap or a handle that I can use to create a Bitmap object?

I'm not wanting to change or alter the wallpaper, I'm wanting to display it as a Bitmap object on a Form.

-Daniel
Typing too fast fro my owngood

Microsoft.Win32 is used for accessing the registry, while System.Runtime.InteropServices is used for accessing the unmanaged user32.dll.

Next comes the preparation of the unmanaged function SystemParametersInfo() - this should be located at the top of the Smile | :)

class definition:

[DllImport("user32.dll", CharSet = CharSet.Auto)]<br />
<br />
static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

First thing is to retrieve the current desktop wallpaper, and to do that we don't need to use a function, but simply read a value in the Windows registry. Let's create the method for that:

private string GetCurrentWallpaper()<br />
<br />
{<br />
<br />
    // The current wallpaper path is stored in the registry at HKEY_CURRENT_USER\\Control Panel\\Desktop\\WallPaper<br />
<br />
    RegistryKey rkWallPaper = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", false);<br />
<br />
    string WallpaperPath = rkWallPaper.GetValue("WallPaper").ToString();<br />
<br />
    rkWallPaper.Close();<br />
<br />
    // Return the current wallpaper path<br />
<br />
    return WallpaperPath;<br />
<br />
}

Next comes the definition of the method that actually sets the wallpaper, Additional for you . And it's only a few lines of code:

private void SetWallpaper(string WallpaperLocation, int WallpaperStyle, int TileWallpaper)

{

// Sets the actual wallpaper

SystemParametersInfo(20, 0, WallpaperLocation, 0x01 | 0x02);

// Set the wallpaper style to streched (can be changed to tile, center, maintain aspect ratio, etc.

RegistryKey rkWallPaper = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true);

// Sets the wallpaper style

rkWallPaper.SetValue("WallpaperStyle", WallpaperStyle);

// Whether or not this wallpaper will be displayed as a tile

rkWallPaper.SetValue("TileWallpaper", TileWallpaper);

rkWallPaper.Close();

}

Smile | :)

I only needed to get the wallpaper. I didn't know that the registry's value was updated that well (I just looked on mine and it's correct, despite me circumventing the control panel applet), so I'm good to go. I already know how to set the wallpaper (and I have a handy app available for free download from my blog). Thank you for the info! It helps me greatly!

-Daniel
Typing too fast fro my owngood

Hi!
I developed a Pocket PC application in VS2005 and i want to deploy it on Pocket PC so how do i make setup and deploy to it. Any suggestion will be appreciated.
Thanks in advance.

Its the same as a windows application,

In new project, select Other Project Types, Setup and Deployment and select
Smart Device Cab Project

Check this link out...
It might help..

http://www.devx.com/wireless/Article/31198/1954

Thanks Jalpesh B. Patel.
Dear Patel i found Add Project output Group empty after so how do i achieve this; "In the File System pane, right-click Application Folder and select Add—>Project Output…. Add Project Output Group window, select Primary output set Primary output."
Thanks again
waiting for your response.

i am working with a project likely to be a media player.
can sum one tell me how to play video files in c#?
which namespace to be included?
which class to be used?

with thanks...

Namespace: System.Media

http://msdn2.microsoft.com/en-us/library/system.media.aspx

Smile | :)

System.Media just contain classes for Sound Player but not 4 vido files. If u know how to play video files , can u give me a short codes

You should look into WPF it has some fantastic ability to handle media files. Try this article
http://msdn.microsoft.com/msdnmag/issues/07/03/DigitalMedia/default.aspx

Greetings
I am trying to make threads that run loops to be at the exact same step as the other threads. For example an output to the application could be the following:

Thread 1 = iteration 1
Thread 2 = iteration 1
Thread 3 = iteration 1
Thread 4 = iteration 1
Thread 1 = iteration 2
Thread 2 = iteration 2
Thread 3 = iteration 2
Thread 4 = iteration 2
and not
Thread 1 = iteration 3
Thread 2 = iteration 2
Thread 3 = iteration 1
Thread 4 = iteration 1
Thread 1 = iteration 4
Thread 2 = iteration 3
Thread 3 = iteration 2
Thread 4 = iteration 1

I am thinking of an implementation such as:
the first thread runs the iteration and waits
the second thread runs the iteration and waits...
the last thread runs the iteration and notifies all the other threads to wake (and go to the next step)
I have tried the following but it doesnt work:

<br />
CommonClass commonObject = (CommonClass)o;//a public object created in Main for all the threads to acquire lock to<br />
        for (int i = 0; i < 4; i++)<br />
        {<br />
            Console.WriteLine("Thread " + Thread.CurrentThread.Name + " is in iteration " + i);<br />
            lock (commonObject)<br />
            {<br />
                if (Interlocked.Decrement(ref threadCounter) == 1)//last thread <br />
                {<br />
                    threadCounter = 4;//reset the counter<br />
                    Monitor.PulseAll(commonObject);//notify all the other threads to wake<br />
                }<br />
                else { Monitor.Wait(commonObject); }//or wait until notified<br />
            }            <br />
        }<br />

Do you find this approach correct?
Can you please suggest feasible solution?

Thanks in advance

Disclaimer: although I have studied threading, I am no guru, so take my suggestion with a grain of salt.

Also I'm not sure of .NET threading syntax, so everything will be in pseudocode.
---

Have one thread act as a scheduler for the rest of the threads, telling them when they are allowed to run.

1. Start running each thread.
2. When a thread completes an iteration, tell it to Wait on some condition variable that is regulated by the scheduler thread.
3. The scheduler thread will do nothing until the wait queue is "full" IE all available thread are waiting, or the "running" queue is empty.
4. The scheduler broadcasts to all waiting threads, telling them to wake up and start running.

To do what you want you can use a locking mechanism on a data object and start the threads in order. Essentially the locking mechanism causes a side effect of putting the threads in the order that they are received at the lock.

HOWEVER, the order that the threads arrive at the lock is not guaranteed and thus your program may not run the order that you want.

I don't understand why you would use separate threads if the order that these operations be done is critical. If the order is critical, then you should use a single thread to process the operations in order to guarantee the order.

Phil

hello C# community,

I have a windows form with a tab control in it, that acts as the container for 6 or 7 tabs. I would like to add shortcut functionality, so that when a user presses the F3 key on the key board it will go to tab1 of the tab control, F4 to tab2 of the tab control.....and so on.

I know I read how to do this somewhere, I have been having trouble locating where that was. Is it a property on the individual tab page or is it in the tabcontrol?

perhaps someone knows off the top of their head.

thanks in advance,
FG

-- modified at 10:38 Wednesday 25th July, 2007

I am who I am because of who everyone around me is.

[Message Deleted]

Impatient, aren't you?

This board is supported by volunteers who do this on their own time, not yours. You're not paying for support, so why are you bitching that you're not getting it fast enough??

Enable the KeyPreview property of your form, then handle the form's KeyDown event. Check for the hot keys you want and show the appropriate tab depending on which key was hit.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Dave Kreskowiak wrote:
You're not paying for support, so why are you bitching that you're not getting it fast enough??

I could give him a rather drawn out solution, but he'd have to pay up to me through PayPal first. Oh and by the way, my solutions are As-is, no refunds Poke tongue | ;-P

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

relax...I just thought it was not such a hard question for this tremendous community.... In any case, I did not think that my post was particularly "rude", if I offended you or anyone else here at Code Project, my sincerest apologies.
Why does everything have to boil down to money. No I am not paying for support, but I am not paying for you to scowl me because I added a short comment to my own post. A great part of being part of a community is knowing how to interact in a community.

just like you, I am a volunteer as well, and where I can, I help people that need the help.

-- modified at 15:16 Wednesday 25th July, 2007

-- modified at 15:26 Wednesday 25th July, 2007

I am who I am because of who everyone around me is.