Safely saving to a stream [modified] - C# Discussion Boards

Re: Generics Exampe needed

Gareth H3-Jun-08 4:45

Gareth H

3-Jun-08 4:45

raja baireddy,

MSDN[^]

Regards,
Gareth.

(FKA gareth111)

Re: Generics Exampe needed

Scott Dorman3-Jun-08 4:54

Scott Dorman

3-Jun-08 4:54

A good introduction is available on MSDN[^]. Read through that, try and actually compile/run some of the examples (so you can step through them in a debugger and watch what happens) and then, if you have more questions post them again.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

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error while updating control from Exited event of process

Xmen Real 3-Jun-08 4:15

Xmen Real

3-Jun-08 4:15

i want to update the listview selected item from Exited event but everytime i got this error:
Cross-thread operation not valid: Control 'listview1' accessed from a thread other than the thread it was created on.

here is the error code :

void exited_event(object sender, EventArgs e)
{
listview1.Items[0].SubItems[0].Text = "abc";
}

any solution ?

thanks

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Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-i?TV.C\y<p?jxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: error while updating control from Exited event of process

leppie3-Jun-08 4:29

leppie

3-Jun-08 4:29

Look at Control.Invoke and Control.InvokeRequired. You cannot change UI stuff on a non-UI thread.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

Re: error while updating control from Exited event of process

Xmen Real 3-Jun-08 5:05

Xmen Real

3-Jun-08 5:05

but i can change it by timer that is also non-UI thread, but if i enable it from that event it also gave same error Sigh | :sigh:

Re: error while updating control from Exited event of process

Mark Churchill3-Jun-08 17:46

Mark Churchill

3-Jun-08 17:46

The timer Tick event runs on the UI thread.

Mark Churchill
Director
Dunn & Churchill
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Re: error while updating control from Exited event of process

Xmen Real 3-Jun-08 17:49

Xmen Real

3-Jun-08 17:49

oh..anyway my problem has been solved by Control.Invoke() and Control.InvokeRequired

Safely saving to a stream [modified]

Russell Jones3-Jun-08 4:10

Russell Jones

3-Jun-08 4:10

I'm using this piece of code to dump my config settings to disk. Only problem is it seems to break on certain machines. No error gets thrown but when i try to read the file back out I get an "invalid padding" error I assume that for some reason the entire stream isn't getting written out.

Do i need to flush the stream prior to closing it? Should i save it as config.new and then overwrite the origianl veraion?

public static void EncryptToFile(string ConfigData, string FilePath)
      {
          FileStream fStream = File.Open(FilePath, FileMode.OpenOrCreate);
          Rijndael RijndaelObject = Rijndael.Create();
          ICryptoTransform encryptor = RijndaelObject.CreateEncryptor(key, IV);
          CryptoStream csEncrypt = new CryptoStream(fStream, encryptor, CryptoStreamMode.Write);
          StreamWriter sw = new StreamWriter(csEncrypt);
          sw.WriteLine(ConfigData);
          sw.Close();
          csEncrypt.Close();
          fStream.Close();
      }

Thanks for any ideas you can give me

Russell

modified on Tuesday, June 3, 2008 10:19 AM

Re: Safely saving to a stream

sudhir_Kumar3-Jun-08 4:15

sudhir_Kumar

3-Jun-08 4:15

I think make a detailed log for this function.Then you can identify where the function if failed.

Sudhir Kumar

Re: Safely saving to a stream

Xmen Real 3-Jun-08 4:18

Xmen Real

3-Jun-08 4:18

what do you mean by 'break' ?

Re: Safely saving to a stream

Scott Dorman3-Jun-08 4:28

Scott Dorman

3-Jun-08 4:28

The safest way to do this would be to save it as a new file and then overwrite the original. You also want to wrap the streams in a using statement to ensure that they get disposed of properly. Finally, you want to add some try...catch handling.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

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Re: Safely saving to a stream

led mike3-Jun-08 5:02

led mike

3-Jun-08 5:02

Russell Jones wrote:
it seems to break

Russell Jones wrote:
RijndaelObject.CreateEncryptor(key, IV);

Those parameters are not declared or initialized anywhere in the code you posted. Since the method is static I would hold them highly suspect.

Also you are doing nothing in the code you posted to verify a valid FilePath

led mike

Infragistics ultraChart

NewToAspDotNet3-Jun-08 3:39

NewToAspDotNet

3-Jun-08 3:39

Hi All,
I m using the infragistics ultraChart to show some data.
The problem is that the values on the X line, wil show automatically in decimal format. How can i change this to integers?

Thanx.

Re: Infragistics ultraChart

Colin Angus Mackay3-Jun-08 3:42

Colin Angus Mackay

3-Jun-08 3:42

This question is specific to a third party product. Please use the forums on the Infragistics website: http://forums.infragistics.com/forums/default.aspx[^]

Recent blog posts:
* Introduction to LINQ to XML (Part 1) - (Part 2) - (part 3)

My website | Blog

Re: Infragistics ultraChart

Nouman Bhatti3-Jun-08 20:02

Nouman Bhatti

3-Jun-08 20:02

Chances to get a good answer are high on infragistics forumn

Is there a way to implement UNION declaration in C# ?

cyh_cyh3-Jun-08 3:33

cyh_cyh

3-Jun-08 3:33

In C/C++, we may code:

union aa { 
    double      bb;
    char        cc[8];
} a;

In this way we may verify the actual data stored in memory for the double. How do I do that in C#?

Thanks.

Re: Is there a way to implement UNION declaration in C# ?

CPallini3-Jun-08 3:40

CPallini

3-Jun-08 3:40

Does this [^] help (see Attributes on Structs paragraph at the bottom of the page)?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: Is there a way to implement UNION declaration in C# ?

led mike3-Jun-08 5:06

led mike

3-Jun-08 5:06

CPallini wrote:
Does this [^] help

No, documentation is not helpful.

Well at least to those who refuse to read it. Yet somehow reading the same information in a forum post is helpful, go figure. Laugh | :laugh:

led mike

Re: Is there a way to implement UNION declaration in C# ?

cyh_cyh4-Jun-08 3:23

cyh_cyh

4-Jun-08 3:23

It really helps, thanks a lot.

Seems it doesn't take arrays as follow:

using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Explicit)]
struct TestUnion 
{
    [FieldOffset(0)] 
    public double d;
    [FieldOffset(0)] 
    public char[] c;      // will get error msg at run time :confused:
}

workaround would be:

[StructLayout(LayoutKind.Explicit)]
struct TestUnion 
{
    [FieldOffset(0)] 
    public double d;
    [FieldOffset(0)] 
    public char c0;   
    [FieldOffset(2)] 
    public char c1; 
    [FieldOffset(4)] 
    public char c2; 
    [FieldOffset(6)] 
    public char c3;   
}

Re: Is there a way to implement UNION declaration in C# ?

CPallini4-Jun-08 3:46

CPallini

4-Jun-08 3:46

cyh_cyh wrote:
Seems it doesn't take arrays as follow:

Yes. I guess it is because arrays are allocated on the heap.
Smile | :)

Re: Is there a way to implement UNION declaration in C# ?

Scott Dorman3-Jun-08 4:14

Scott Dorman

3-Jun-08 4:14

Yes, but not in the same way. You need to use the StructLayout and FieldOffset attributes on the struct and fields, respectively. For your example, the equivalent in C# would be

[StructLayout(LayoutKind.Explicit)]
struct aa
{
   [FieldOffset(0)]
   public double bb;
 
   [FieldOffset(0)]
   char[] cc;
}

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

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Change mouse pointer

Radu_203-Jun-08 3:22

Radu_20

3-Jun-08 3:22

Do you know how can I change the windows mouse pointer. I can chage it on my application form ... but i waould like to change it on all windows. I want to simulate a selection rectangle but on all applicationn that allows the user to select a region of the screen. Thanks a lot.

http://www.softrun.ro

Re: Change mouse pointer

Vasudevan Deepak Kumar8-Jun-08 20:48

Vasudevan Deepak Kumar

8-Jun-08 20:48

Would this help you?

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.cursor.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
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And all the men and women merely players.
They have their exits and their entrances;
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How to Change PaperSize,LandScape, ... in ReportViewer ?

hdv2123-Jun-08 2:51

hdv212

3-Jun-08 2:51

hi i using reporting service(report viewer) in my app, but i don't how to set paper size,landScape, ... in my report at designTime and runTime, can anyBody help me ?
thanks

pass data from runtime created form to main form.

redspiderke3-Jun-08 2:45

redspiderke

3-Jun-08 2:45

Hi,

I need to build a application where I have a mainform and multiple runtime generated forms.
There are many good methods to pass data between 2 winforms but I have a problem to get it work with runtime generated forms.

Is there someone who have a simple sample where i can start from.

Thanks

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