C# Discussion Boards - CodeProject

zoltan_ie1-Apr-03 2:16

1-Apr-03 2:16

can it be done in C#? I don't even know if it is a bitwise operation. Any help, I'm new to programming and would like to use the helpful feature.

const ulong VOLATILITY_DISPLAY_PERFORMANCE =1;
const ulong VOLATILITY_DISPLAY_STANDARDDEVIATION=2;
const ulong VOLATILITY_DISPLAY_ARITHMETICMEAN =4;
const ulong VOLATILITY_DISPLAY_EFFICIENCYINDEX =8;
const ulong VOLATILITY_DISPLAY_SHARPE =16;
const ulong VOLATILITY_DISPLAY_VARIANCE =32;
const ulong VOLATILITY_DISPLAY_ALPHA =64;
const ulong VOLATILITY_DISPLAY_BETA =128;
const ulong VOLATILITY_DISPLAY_TREYNOR =256;

long value = VOLATILITY_DISPLAY_PERFORMANCE + VOLATILITY_DISPLAY_SHARPE;

/8it throws a compiler error for next line*/
if(value & VOLATILITY_DISPLAY_SHARPE) /* == TRUE */
{
/*DO SOME THING*/
}

Re: Bitwise operations

Jim Stewart1-Apr-03 4:15

Jim Stewart

1-Apr-03 4:15

You could try the Framework's BitArray class.

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Re: Bitwise operations

monrobot131-Apr-03 4:23

monrobot13

1-Apr-03 4:23

You could try this, convert value to a ulong and in your if statement use Convert.ToBoolean () to convert the value & VOLATILITY_DISPLAY_SHARPE to a boolean:

ulong value = VOLATILITY_DISPLAY_PERFORMANCE + VOLATILITY_DISPLAY_SHARPE;

/*it no longer throws a compiler error for next line*/
if(Convert.ToBoolean(value & VOLATILITY_DISPLAY_SHARPE)) /* == TRUE */
{
/*DO SOME THING*/
}

- monrobot13

Re: Bitwise operations

James T. Johnson1-Apr-03 6:58

James T. Johnson

1-Apr-03 6:58

I think an enum is better suited for this, after all you are grouping a series of constants that can all be used for the same thing.

Also, in C# a long is 64-bits and ints are 32-bits so you probably won't need a ulong (judging by your code anyway).

Now a little code:

[Flags()]
public enum VolatilityDisplay
{
  Performance = 1,
  StandardDeviation = 2,
  ArithmeticMean = 4,
  EfficiencyIndex = 8,
  Sharpe = 16,
  Variance = 32,
  Alpha = 64,
  Beta = 128,
  Treynor = 256
}

Just a quick note about the [Flags()] bit. This is basically telling the framework that the values in this enum can be used in bitwise operations. Now to get on with the rest of your question.

VolatilityDisplay value = VolatilityDisplay.Performance | VolatilityDisplay.Sharpe;
 
if( (value & VolatilityDisplay.Sharpe) != 0 )
{
  /* do something */
}

Two important things to note here:

1) When you wish to set two different bits you should use the bitwise-or (|)operator and not addition. The reason is that the addition won't do what you think if the bit is already set.

Take for example the bitvector set to VolatilityDisplay.Performance | VolatilityDisplay.StandardDeviation the integer representation of this is 3. Now you want to make sure that VolatilityDisplay.Performance is set. If you use the addition operator (+) then you are really performing 3 + 1 = 4, which if you look at the meaning of 4 in the list above it comes out as VolatilityDisplay.ArithmeticMean. Now neither of the values you wanted are set and one you didn't want is set.

2) The second part is that unlike C/C++, if statements require whatever you are testing to actually be a bool and not simply a zero/non-zero value. So you have a couple of different options, the one I used above, which is just testing to ensure a non-zero value was returned. The other is the one that someone else suggested which is to use Covert.ToBoolean. Both do pretty much the same thing, so its up to you which you want to use.

Hope that clears some things up for you,

James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

How To Use COM DLL in POcketPC application

Member 3187921-Apr-03 2:15

Member 318792

1-Apr-03 2:15

Hi,

I am a novice to .NET. I want to develop a sample for Pocket PC mobile application. I have a COM DLL with me. Using this DLL, i want a sample wherein I want to call the methods of the DLL.

Please kindly let me know
1)how to develop a mobile application?
2)How to add the COM DLL to the sample?
3)How to call methods of the component?
4)How to execute the sample?

I am in urgent need of this sample. Please reply me soon.
Waiting for ur reply eagerly...

Your help would be appreciated.

Thanks in advance.

MessageBox Buttons

Mazdak1-Apr-03 0:49

Mazdak

1-Apr-03 0:49

Is there any way to change the text of MessageBox buttons?

Mazy

"And the carpet needs a haircut, and the spotlight looks like a prison break
And the telephone's out of cigarettes, and the balcony is on the make
And the piano has been drinking, the piano has been drinking...not me...not me-Tom Waits

Re: MessageBox Buttons

James T. Johnson1-Apr-03 7:27

James T. Johnson

1-Apr-03 7:27

It can only be changed to the predefined buttons in the MessageBoxButtons enum. Taking a peek at the underlying Win32 MessageBox function it doesn't have that ability either. At least it wasn't apparent from the docs.

James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

multi threaded client

novice.NET1-Apr-03 0:18

novice.NET

1-Apr-03 0:18

How do i write a multi threaded client in C#, which will enable a client to communicate with multiple servers?

hoping for a reply...

novice

Re: multi threaded client

Le centriste1-Apr-03 10:01

Le centriste

1-Apr-03 10:01

System.Threading.Thread

web reference

novice.NET1-Apr-03 0:14

novice.NET

1-Apr-03 0:14

Assume i have developed a module using a system & my friend is writing a client for the same in another system. Now he wants to add a reference to the object that was created by me & he wants me to make it available to him as a web refernce. How do I go about doing this?

hoping for a reply...

novice

Is this impossible ?

Smitha Nishant31-Mar-03 23:32

Smitha Nishant

31-Mar-03 23:32

Hello all,

I am developing an application, which helps make PDF documents. I have provided a RichTextBox for text entry and I have used my own context menu for this RichTextBox, which allows for changing font, italise/bolden the text etc. Right now I want to figure out a way to get the formatting information of the text, like which portion of the text has what font, if its italicised, boldened, bulleted, underlined etc. If I am right, I will have to parse the RTF and get this information. How do I go about doing this? Are there any easy ways to accomplish the task ? Or is this totally impossible ?

Thanks
Smitha

It is better to be hated for what you are than to be loved for what you are not.
-- Andre Gide

Re: Is this impossible ?

James T. Johnson1-Apr-03 7:15

James T. Johnson

1-Apr-03 7:15

Smitha Vijayan wrote:
If I am right, I will have to parse the RTF and get this information.

Parsing the RTF is one way (and definately the fastest way), another would be to use the SelectionStart, SelectionLength and Selected* properties to advance through every character and pull the information you need.

For parsing information, http://www.wotsit.org/search.asp?page=3&s=text[^] there are 3 different standards listed there. I'm not sure which version the RichTextBox creates, but at the most you should only have to worry about parsing what your RichTextBox can produce.

[edit]A quick warning, the 2002 version is 225 pages long OMG | :OMG:

[/edit]
James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

Re: Is this impossible ?

Smitha Nishant1-Apr-03 20:50

Smitha Nishant

1-Apr-03 20:50

Thanks James. I think I will go for the second one. RTF parsing sounds like a huge task Frown | :(

James T. Johnson wrote:
A quick warning, the 2002 version is 225 pages long

Yup, I saw that Cry | :((

Smitha

It is better to be hated for what you are than to be loved for what you are not.
-- Andre Gide

Getting a web browsers url

ferdeen31-Mar-03 20:47

ferdeen

31-Mar-03 20:47

Hello,

Is there a namespace/component/api that can allow me to
retrieve the url of all Web Browsers are currently loaded
on a machine ?

I have looked a Sysem.Web Sysstem.Net but can't find
anything... pls help

Thanks, Cry | :((

Ferdeen

Place button on form title?

wei_xiang31-Mar-03 14:49

wei_xiang

31-Mar-03 14:49

Hi,

I want to add some custom buttons(such like fading, print, etc.) in the title bar, left to minimize button. Is that possible in C#?

Thank you,
weixiang

Inserting a tabpage

monrobot1331-Mar-03 14:32

monrobot13

31-Mar-03 14:32

Does anyone know of any way to insert a tabpage into a tabcontrol? I don't want to tack the page onto the end with Add() I want to be able to insert it at any position. Anyone know of a way to do this?

Thanks in advance.

- monrobot13

Re: Inserting a tabpage

Chris Jobson1-Apr-03 8:14

Chris Jobson

1-Apr-03 8:14

I don't know of a way to do it directly, but it's fairly easy to do by shuffling the tab pages around. For example:

    private static void AddTabPageAtIndex(TabControl tc, TabPage tp, int index) {<br />
      // Get index into sensible range<br />
      if (index < 0)<br />
        index = 0;<br />
      else if (index > tc.TabCount)<br />
        index = tc.TabCount;<br />
<br />
      // Add a dummy page to the end<br />
      tc.TabPages.Add(new TabPage());<br />
<br />
      // Copy tab pages that are to be after new one<br />
      for (int i = tc.TabCount-1; i > index ; --i)<br />
        tc.TabPages[i] = tc.TabPages[i-1];<br />
      <br />
      // Insert the new page<br />
      tc.TabPages[index] = tp;<br />
    }

Chris Jobson

Re: Inserting a tabpage

monrobot131-Apr-03 13:38

monrobot13

1-Apr-03 13:38

Thanks for the info Chris. It's a big help.

- monrobot13

using references across servers

novice.NET31-Mar-03 9:11

novice.NET

31-Mar-03 9:11

Assume that i am having a scenario where there are 2 servers that have been developed by different people & now I want to write a client that references both of these server objects using remoting. How do I add a reference to the server object that is residing on another server. How should the server admin make his object available to me? Will adding a web reference help? If so, where should the server object be available?

hoping for a reply...

anto

Re: using references across servers

SimonS1-Apr-03 7:23

SimonS

1-Apr-03 7:23

I suggest you read through Ingo Rammer's[^] website and maybe read the sample chapters here[^].

Cheers,
Simon

"I ask candidates to create an object model of a chicken.", Bruce Eckel on interviewing programmers.
animation mechanics in SVG (my first abstract photo)

object doing remoting

novice.NET31-Mar-03 9:01

novice.NET

31-Mar-03 9:01

What do i need to do to create an object that will do remoting for me. From a system, I want to run an application that will create some objects & each of that objects will carry out remoting on a specific server each.

hoping for a reply..

novice.NET

Re: object doing remoting

ferdeen31-Mar-03 20:51

ferdeen

31-Mar-03 20:51

Check out this link, it gives several example of remoting.

http://samples.gotdotnet.com/quickstart/howto/doc/remoting/mainfeatures.aspx

CMYK colours

S O S31-Mar-03 4:31

S O S

31-Mar-03 4:31

How do I convert a Colour into CMYK? (Or get the CMYK values from it)

(I need to get the CMYK values of each pixel in a picture in an Image class)

Re: CMYK colours

Stephane Rodriguez.31-Mar-03 5:07

Stephane Rodriguez.

31-Mar-03 5:07

I am not aware of offline converters, but you could filter GDI+ channels out using System.Drawing.Imaging.SetOutputChannel method, based on the ColorChannelFlag enumeration. More info here[^].

Re: CMYK colours

S O S31-Mar-03 7:43

S O S

31-Mar-03 7:43

Yes, I noticed that page while digging through MSDN, but I don't understand where/how do I use the SetOutputChannel function... Frown | :(

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