80% call doA() , 20% call doB() - C# Discussion Boards

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Re: God book on patterns in C#

Jim Stewart26-Aug-03 10:20

Jim Stewart

26-Aug-03 10:20

The book on patterns is Design Patterns: Elements of Reusable Object-Oriented Software[^], by Gamma, et al.

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Cuting out a part of a bitmap

Ylis23-Aug-03 11:45

Ylis

23-Aug-03 11:45

I have looked through the System.Drawing namespace in search for a method that takes a part of a bitmap. But I can't seem to find any.

Grateful for any help offered

Re: Cuting out a part of a bitmap

J. Dunlap23-Aug-03 13:47

J. Dunlap

23-Aug-03 13:47

1) Create a new bitmap the size of the area you want to cut out
2) Make a Graphics for that bitmap
3) Use DrawImage to draw the image at the correct location

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: Cuting out a part of a bitmap

Ista23-Aug-03 19:17

Ista

23-Aug-03 19:17

Actually I personally think it would be faster to use the close method and let the CLR amanage creating the new image for yoiu which would be inherently faster.

Although I'm a direct3D programmer so the speed would only be noticed by me.

nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: Cuting out a part of a bitmap

Ylis24-Aug-03 6:12

Ylis

24-Aug-03 6:12

oki, thx

EFFICIENCY: lock{} or .Synchronized

MeisterBiber23-Aug-03 11:45

MeisterBiber

23-Aug-03 11:45

hi !

does anybody know which of these two methods to synchronize an ArrayList is more efficient?

execute critical code in a lock block:

lock(myArrayList)
{
blabla
}

-or-
define the ArrayList as Syncronized:

myArrayList = ArrayList.Synchronized(unsyncrArrayList);

thanks.
andi

Re: EFFICIENCY: lock{} or .Synchronized

Julian Bucknall [MSFT]25-Aug-03 10:15

Julian Bucknall [MSFT]

25-Aug-03 10:15

Andi

There's no difference performance-wise. (Synchronized uses the lock keyword itself.) Sop it boils down to whether you need to specify the actual intent in your code. With

lock(MyArrayList) {
  MyArrayList.This();
  MyArrayList.That();
  MyArrayList.TheOther();
}

you are explicitly stating that, yes, this is threadsafe. Look, there's the lock keyword. With

MyArrayList.This();
MyArrayList.That();
MyArrayList.TheOther();

you are saying, trust me, I've set up MyArrayList to be a Synchronized version of another ArrayList, so this is threadsafe. Maybe the code that sets up the Synchronized version is nearby, so it's obvious (say in a using block).

Of course, if you forget to set up MyArrayList in that way, you've got a bug.

Cheers, Julian
Program Manager, C#

This posting is provided "AS IS" with no warranties, and confers no rights.

80% call doA() , 20% call doB()

MeisterBiber23-Aug-03 7:01

MeisterBiber

23-Aug-03 7:01

hi !

i have the following problem:

i have -lets say- 3 procedures, which should be called at a given probability:
60 % proc. A
30 % proc. B
10 % proc. C
how can i manage this?

my idea:

r = new Random();
if (r.NextDouble() < 0.6) -> A
if (r.NextDouble() >=0.6 and < 0.9) -> B
if (r.NextDouble() >=0.9 and < 1.0) -> C

in principle this works fine, BUT
is this efficient?
is it exact?
what about the pseudo-random-number-generator in c#?

do you have any suggestions ?!?!?!

THANK YOU !

Re: 80% call doA() , 20% call doB()

Daniel Turini23-Aug-03 12:10

Daniel Turini

23-Aug-03 12:10

It does not work, it has a bug. They way you coded, there will be times where no procedure will be called because you are calling r.NextDouble several times. What you need is to store the number on a local variable, like this:

r = new Random();
double d = r.NextDouble();
if (d < 0.6) -- A
if (d >=0.6 and < 0.9) -- B
if (d >=0.9 and < 1.0) -- C

I hope that you have money because it’s necessary to be practical.
And I hope that at least once a year you put some money in front of you and say "you are mine" just to make clear who owns who. - Victor Hugo

Re: 80% call doA() , 20% call doB()

MeisterBiber23-Aug-03 13:21

MeisterBiber

23-Aug-03 13:21

of course !!!!! Blush | :O

thanks.

Restricting access to non *.aspx files

Meysam Mahfouzi22-Aug-03 18:16

Meysam Mahfouzi

22-Aug-03 18:16

You no with putting some web.config file including below lines:

<configuration>
<system.web>
<authorization>
<deny users="?" />
</authorization>
</system.web>
</configuration>

in some folder, access to that folder is only possible for authenticated users. but this happens only for *.aspx files.
How could we restrict access to for example *.zip files?

Re: Restricting access to non *.aspx files

Mazdak22-Aug-03 19:38

Mazdak

22-Aug-03 19:38

This administrative part, not developer business , simply you have to do it from your windows.

Mazy

No sig. available now.

can't receive KeyPress Event in Window Form

zecodela22-Aug-03 15:22

zecodela

22-Aug-03 15:22

hi,
in my app., i have a window form with several labels and groupboxes but no button. i can receive keypress event of that form in my event handler.
however, after added a button the window form, i can't receive KeyPress Event. after deleted it or added another label, it work again!
any help?
thanks,
jim

Re: can't receive KeyPress Event in Window Form

MeisterBiber23-Aug-03 8:38

MeisterBiber

23-Aug-03 8:38

hi !

you have to set the KeyPreview-Property of the form to true.

cu
andi

Re: can't receive KeyPress Event in Window Form

Ista23-Aug-03 15:39

Ista

23-Aug-03 15:39

you also have to

public override bool ProcessKeyPreview( Message msg) {return bProcessed;}

false = did not handle
true = did handle

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: can't receive KeyPress Event in Window Form

A.Wegierski24-Aug-03 20:07

A.Wegierski

24-Aug-03 20:07

protected override bool ...

Hi,
AW

Re: can't receive KeyPress Event in Window Form

Ista25-Aug-03 3:22

Ista

25-Aug-03 3:22

Well your right but i dont see the point. I like javas rule much better on modifiying overriden methods.

nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Distribute code in separate files

sumeat22-Aug-03 14:01

sumeat

22-Aug-03 14:01

Hi,

Is it possible to distribute C# class code in separate files as is possible with C++ classes?

The classes in my application are getting bigger and bigger and distributing different functionalities in separate files could help in managing the code.

Thanks,

Re: Distribute code in separate files

J. Dunlap22-Aug-03 14:13

J. Dunlap

22-Aug-03 14:13

When this happens, it's best to divide the classes up into multiple classes. However, sometimes that's not possible. The current version of C# does not support this, but the next version will support it.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Caret implementation

Lasse Johansen22-Aug-03 11:03

Lasse Johansen

22-Aug-03 11:03

I am making a control, and in that I need to implement a caret. I do have problems with that simple task.

First I just want to be able to place the caret in the end of a custom text. I do like this:

float xpos = gfx.MeasureString(string, font).Width
g.FillRectangle(System.Drawing.Brushes.Black, xpos - 3, 0, 1, this.Font.Height);

There is a problem with this. If I use 333 as the text, it goes fine, but do I use 1111111191, the caret is being placed maybe 5 - 10 pixels from the last 1. It seems to me that the size of 1 is measured larger than it actually is.

What can I do about this problem? Am I attacking this problem from the wrong angle? Is there any implementation already made?

Gooky

Re: Caret implementation

A.Wegierski24-Aug-03 20:23

A.Wegierski

24-Aug-03 20:23

Add caret sign to the end of displayed string in paint method -or- add it to the string in setting Text property and remove it in getting this property.

Hi,
AW

Re: Caret implementation

Lasse Johansen26-Aug-03 9:50

Lasse Johansen

26-Aug-03 9:50

That is not really a good solution. Having a carrot inside a word, makes it look a little strange when the carrot blinks.

I found a solution using API calls to old GDI.

Gooky

How to change Back Color of ToolBar

sumeat22-Aug-03 9:39

sumeat

22-Aug-03 9:39

How to change the back color of a tool bar control?

Thanks

Remote Object in IIS

Mazdak22-Aug-03 7:23

Mazdak

22-Aug-03 7:23

How can I host a remote object in IIS?

Mazy

No sig. available now.

Re: Remote Object in IIS

Meysam Mahfouzi22-Aug-03 18:06

Meysam Mahfouzi

22-Aug-03 18:06

You now there are actually two ways to get a remoting application up and running: via a web server or a host utility. The first approach needs using IIS and your question is about this one.

I hope you have below files:

1- SomeServer.cs and its corresponding web.config file. put these all in some folder like "MyServer"

2- SomeClient.cs and its corresponding SomeClient.exe.config file. put them again in some directory like this: "MyClient"

3- Next create a folder named "bin" under the MyServer directory.
put the compiled version of SomeServer.cs which is SomeServer.dll in this bin directory.

4- put the compiled version of SomeClient.cs named SomeClient.exe in that MyClient directory.

5- Use internet services manager to create 2 virtual directories for both above mentioned directories.

6- Run SomeClient.exe

If any thing is not clear tell me.
I hope this helps. Rose | [Rose]

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not Arabian gulf!

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