Re: read stream to unmanaged memory - C# Discussion Boards

Zishan Haider5-Jul-05 20:32

5-Jul-05 20:32

I have a chat application that uses UdpClient. Ok.. now I want to send messages to the clients who are indirectly connected to the internet.. like a shared connection over LAN. What should I add besides the regular steps?

Regards

DataGrid Row Select

lovelylooney5-Jul-05 20:22

lovelylooney

5-Jul-05 20:22

Hello All,

I have a data grid on my form and a Delete button adjacent to the grid. To perform Delete action I want to select the row but I am not able to do this.

How can I select a row on Mouse Click?

Please somebody help me.

Thanks in advance

Looney

Re: DataGrid Row Select

xrado5-Jul-05 20:45

xrado

5-Jul-05 20:45

add to datagrid mouse click event handler

dataGrid.Select(dataGrid.CurrentCell.RowNumber);

Re: DataGrid Row Select

lovelylooney5-Jul-05 21:36

lovelylooney

5-Jul-05 21:36

Thanks a lot xrado.

help me override keypress in datagrid

xrado5-Jul-05 20:06

xrado

5-Jul-05 20:06

when i press enter i want to select the whole row in datagrid so i added
....
this.dataGrid1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.DataGrid1KeyPress);
....
void DataGrid1KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if (e.KeyChar == (char)Keys.Enter) dataGrid1.Select(dataGrid1.CurrentCell.RowNumber);
}

..and i overrided onkeypress in mydatagrid with

protected override void OnKeyPress(KeyPressEventArgs e)
{
base.OnKeyPress (e);
}

but not working...what is missing??

read stream to unmanaged memory

ZejulioZ5-Jul-05 17:03

ZejulioZ

5-Jul-05 17:03

Is there any ways to read directly and rapidly from a stream to an unmanaged buffer ( IntPtr or byte* ) without having to do a convertion from the byte[] to the IntPtr through Marshal.Copy method ?

More clearly, I want to avoid this Marshal.Copy :

byte[] b = new byte[1024];<br />
int size = theStream.Read(b, 0, 1024);<br />
IntPtr bufferPtr = Marshal.AllocHGlobal(size);<br />
Marshal.Copy(b, 0, bufferPtr, size);

Apparently there is a UnmanagedMemoryStream class coming along with winFx doing the job, but I'm looking for something usable with the framework 1.1

Thanks a lot,
Julien.

Re: read stream to unmanaged memory

leppie5-Jul-05 20:08

leppie

5-Jul-05 20:08

Here is an example of how I load a memory font from resources:

PrivateFontCollection col = new PrivateFontCollection();<br />
Stream fontStream = GetType().Assembly.GetManifestResourceStream("somefont.ttf");<br />
<br />
byte[] fontdata = new byte[fontStream.Length];<br />
fontStream.Read(fontdata,0,(int)fontStream.Length);<br />
fontStream.Close();<br />
<br />
GCHandle gc = GCHandle.Alloc(fontdata, GCHandleType.Pinned);<br />
<br />
col.AddMemoryFont(gc.AddrOfPinnedObject(),fontdata.Length);<br />
gc.Free();

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Re: read stream to unmanaged memory

ZejulioZ5-Jul-05 20:59

ZejulioZ

5-Jul-05 20:59

That's interesting. Do you know what is actually GCHandle.AddrOfPinnedObject doing behind ? Because I'm not sure C# arrays are contiguous like C/C++ arrays are. And I profit to ask you; have you compared both methods efficiency ( GCHandle / standard Marshal.Copy ) ?

Thanks for the hint anyway Big Grin | :-D

Julien

Re: read stream to unmanaged memory

leppie5-Jul-05 23:26

leppie

5-Jul-05 23:26

ZejulioZ wrote:
Because I'm not sure C# arrays are contiguous like C/C++ arrays are.

If you pinned it, they are Smile | :)

ZejulioZ wrote:
And I profit to ask you; have you compared both methods efficiency ( GCHandle / standard Marshal.Copy ) ?

Sorry cant help you there...

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Executable Wrapper in C# Anyone?

dotbomb5-Jul-05 16:43

dotbomb

5-Jul-05 16:43

Hello,

I have written C# dlls, but not executable wrappers. I would like to wrap an executable and make it a *service*. Can anyone recommend an article or approach?

Many thanks,

dotBomb

How to get the user fastswitch, User Logon and logoff event

aocraft5-Jul-05 15:13

aocraft

5-Jul-05 15:13

I want to free up the network while the user is logged in to the machine.
Basically I will be running azurues on a machine that my family uses. They have all different logins to the machine. Mum, Dad, Sister, etc.

When I have azureus running under my account they can't browse the web becuase I am chewing up all the network. User fast switching allows my account to continue downloading through azureus ... while someone else logs in to browse the web and check their emails etc

I don't want to give them access to my account to pause/stop azurues.
I can build a small app that can talk azurues by using azurus xml over HTTP plugin. This is not a problem. But I don't want to have to have them manually stop/start azurues with this app as they may forget to restart it.

I wanted to make the whole process automated. So I was going to write a NT service that will pause azurues when a user logs in and resume download when they log off.

But I am not sure where to start looking to get the logon and logoff event.

It would be good if I could get the user id that is logging on and off So that I can select which accounts will pause azureus and which will allow it to continue running (ie my logon account).

Reusing threads?

Lord Kixdemp5-Jul-05 14:54

Lord Kixdemp

5-Jul-05 14:54

Hello everyone! Big Grin | :-D

This is my first post here! Smile | :)

OK, I made some kind of music player that plays the music in a different thread... When the user clicks the "Stop" button, the thread stops, but then I can't restart the thread when the user clicks "Play" because I get a ThreadAbortException! What can I do? Thank you very much! Wink | ;)

Darth_Sulfur (Sulfurik)
http://www.SulfurSoft.tk
ftp://tsfc.homeftp.net
hotline://tsfc.ath.cx

Re: Reusing threads?

S. Senthil Kumar5-Jul-05 19:58

S. Senthil Kumar

5-Jul-05 19:58

It's not possible to reuse aborted threads. What you can do is simply stop and wait instead of aborting the thread. Something like

void ThreadFunc()
{
   while(true)
   {
     if (isStopped)
     {
        startEvent.WaitOne();
     }
     
     // play your file.
   }
}

Regards
Senthil
_____________________________
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Re: Reusing threads?

Anonymous16-Jul-05 11:30

Anonymous

16-Jul-05 11:30

No, just name the thread when you make it, then stop it, then use this trick:

[code]Thread.FreeNamedDataSlot(string name);[/code]

And then you can restart it! Big Grin | :-D

Thanks for your help though! Wink | ;)

.net 2005 beta2 auto generated staic class

Member 6362865-Jul-05 10:14

Member 636286

5-Jul-05 10:14

hello

I have a question about the static class that is auto generated when you create strongly typed resources. The question is how do i make the class and properties stay public in shared resource-only assemblies, when i need to update the resources, becasue the code is auto generated when you update the resource. So the class and properties change back to internal is there a work around ????

thanks in advance

kered

Re: .net 2005 beta2 auto generated staic class

Judah Gabriel Himango5-Jul-05 11:11

Judah Gabriel Himango

5-Jul-05 11:11

It's rarely a good idea to modify tool-generated code. Why not just make a public class that exposes the verious resources as public?

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Judah Himango

Re: .net 2005 beta2 auto generated staic class

Member 6362865-Jul-05 12:21

Member 636286

5-Jul-05 12:21

have you got any samples of how to do this or links it is very hard to find much on this subject.

thnaks for the reply

Re: .net 2005 beta2 auto generated staic class

Judah Gabriel Himango5-Jul-05 18:41

Judah Gabriel Himango

5-Jul-05 18:41

Just make a static class that exposes all your properties publicly.

static class PublicResources
{
   public string SomeStr
   {
       get { return Resources.SomeStr; // where SomeStr is an internal resource
   }
}

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Homosexuals for Christ, Yeah!
Judah Himango

Re: .net 2005 beta2 auto generated staic class

Member 6362865-Jul-05 22:14

Member 636286

5-Jul-05 22:14

Thanks for that bit of code that does work for the main app assembly, but how do i get it work for resource only assemblies, which are updated outside the project. I cant access the class because it is internal below is a web pag that tells me the following:

Listing 1: A static class is generated for all strongly-typed resources.

This class and its properties must be made public in shared, resource-only assemblies, in order for them to be accessible to other components as shown in Figure 2.

http://www.theserverside.net/articles/showarticle.tss?id=LocalizationPractices

this does not make sense because if you up date your resources the class and its properties change back to internal with the auto generated code tool.

Hope you can help in some way

Shell Output

Nazadus5-Jul-05 9:56

Nazadus

5-Jul-05 9:56

How do I read output from another shell program (e.g. netstat --or-- dd) so I can input it into my program?
The current code I have is:
/********************
* Get the list of devices from dd.exe
********************/
System.Diagnostics.Process process1;
process1 = new System.Diagnostics.Process();

process1.EnableRaisingEvents = false;

string strCmdLine;
strCmdLine = "/C dd.exe --list > list.txt";
System.Diagnostics.Process.Start("CMD.exe",strCmdLine);
process1.Close();

My goal is to read a list of devices that it's capable of and provide a list. This program is jsut going to be a wrapper to the shell program.
Any suggestions?

Re: Shell Output

Scott Serl5-Jul-05 11:37

Scott Serl

5-Jul-05 11:37

Look at the ProcessStartInfo class. It has a RedirectStandardOutput property, which lets you read from the StandardOutput streamreader of the process. Then you don't have to bother with cleaning up temporary files when you are done.

Re: Shell Output

Nazadus6-Jul-05 1:51

Nazadus

6-Jul-05 1:51

That was exactly what I was looking for, thanks!

Displaying Write statements in Debuger Output window

zaboboa5-Jul-05 9:24

zaboboa

5-Jul-05 9:24

Is there a way to display writeln, write, or any output from the program
in the debuger output window.
Because, I had to create an additional testForm with the richTextBox in it so I can see my print statements.

Thank you

Re: Displaying Write statements in Debuger Output window

Colin Angus Mackay5-Jul-05 12:08

Colin Angus Mackay

5-Jul-05 12:08

If I remember right, the System.Diagnostic.Debug class should have what you are looking for.

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Child form, which stays in front

Ronen Kfir5-Jul-05 9:18

Ronen Kfir

5-Jul-05 9:18

I'm looking for a way to make an authentication form to my windows form based app. I want this form to be left in front of the parent main form, until user succeccfuly authenticate. If he press cancel it close the parent form. No other from may be load in front if this authentication form.

TIA,

Ronen

Ronen

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