constructor calls constructor ( java: this(..) ) - C# Discussion Boards

Rein Hillmann27-Aug-03 7:59

Rein Hillmann

27-Aug-03 7:59

Treat each color value as a percentage 0=0%, 255=100%

So, a certain color might be (20%, 30%, 90%) in RGB
if you want to intersect that with another color (100%, 60%, 0%) the intersection will be the averages:

(60%, 45%, 45%)

Make sense?

Ista27-Aug-03 11:03

27-Aug-03 11:03

heres a rough equation i got from my friend:

average the "Reds" - aa+11= bb bb/2 = 5D

bb+22 = DD dd/2 = 6e

cc+33 = ff ff/2 = 7f

so the average =c #aabbcc and #112233 = #5D6E7F

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

Rein Hillmann27-Aug-03 12:03

Rein Hillmann

27-Aug-03 12:03

Yeah, it's pretty much the same thing.

(Ra + Rb)/2 = Ri
(Ba + Bb)/2 = Bi
(Ga + Gb)/2 = Gi

It makes sense since if you intersect a red line (255,0,0) with a black line (0,0,0) then the result should be a darker red line (128,0,0)

threading and file permissions

Roger Alsing28-Aug-03 2:05

Roger Alsing

28-Aug-03 2:05

just mix them

Color c1=Color.Green;
Color c2=Color.Yellow;
Color mix=Color.FromArgb( (c1.r+c2.r)/2,(c1.g+c2.g)/2,(c1.b+c2.b)/2);

//Roger

Member 46589526-Aug-03 11:26

Member 465895

26-Aug-03 11:26

I am experiencing a problem when trying to open a file using StreamReader inside a newly created thread.

My main program creates the thread as follows:

Thread t = new Thread(new ThreadStart(ProcessFileThreadOperation));
t.Start();

Pretty straight forward. If I remove the thread altogether and simply call

ProcessFileThreadOperation();

then everything works great, so I know that the code inside this method works fine. However when I call the method so that it can be run on a separate thread, I get an error as soon as it tries to open the StreamReader with the error:

Error: Logon failure: unknown user name or bad password.

So now my best guess is that file security permissions are not passed on to threads? If that's the case, anyone have any suggestions on a workaround? Any help would be _greatly_ appreciated...

Thanks,

Julie

Weird System.IO Related Problems

Ranjan Banerji26-Aug-03 11:03

Ranjan Banerji

26-Aug-03 11:03

I am having what appears to be a strange problem when I do File and or directory management using System.IO.

For example if I have the following lines of code:

Directory.Delete()
File.Copy()
Use the File

If the directory to be deleted is very large, it appears that while the directory is being deleted, the code jumps to the next line which is copy a file and the following line which is use the File. But since the directory deletion is not complete the File Copy or use hte file fails.

I cannot reproduce the problem in debug mode so am not sure what the hell is happening.

Have also noticed the problem when I was doing server maintenance and was deleting a few gigs of files manually. At the same time I was running my code that was writing files to the drive. Since the drive was busy it was taking time to write the files. What was strange is that it attempted to use the file before it finished writing it. Which is the same problem as I mentioned above. It seems to jump over a line of code to the next without completeing teh first, implying that the File IO is asynchronous or that something else is very evil in there Smile | :)

Is Directory.delete asynchronous? Is there a global setting that makes it asynchronous? Any ideas?

Thanks.

dll-dependencies

MeisterBiber26-Aug-03 10:01

MeisterBiber

26-Aug-03 10:01

hi !

i have some troubles concerning dll-dependencies:

there is the main SIMULATOR class, which needs a lot of other classes (Class1,Class2,...)
this Simulator registers a channel for a remote object (COMMUNICATOR) and handles over a self-reference.

now. when i connect my GUI (on another pc) with this Communicator it seems that i need not only the simulator-class but all Class1,Class2 classes as a dll.
(because of the simulator-reference in communicator)

is this realy true, or is there another possibility

Class1
\
Class2 -- Simulator - Communicator <---REMOTE--->GUI
/
Class3

THANKS A LOT !!!!!!!!

constructor calls constructor ( java: this(..) )

MeisterBiber26-Aug-03 9:45

MeisterBiber

26-Aug-03 9:45

hi !

can a constructor call another constructor of the same class?

in java it used to work as follows:
this(....);

--->

public class Test {

String Fname;
String Lname;
int id;

public Test(String Fname, String Lname) {
this.Fname=Fname;
this.Lname=Lname;
}

public Test(int id, String Fname, String Lname){
this(Fname,Lname); //!!!!!!!!!!!!!!!!!
this.id=id;
}

public static void main(String[] args){
Test t = new Test(1,"Tim","Taylor");
}

THANKS !

Re: constructor calls constructor ( java: this(..) )

Jim Stewart26-Aug-03 10:13

Jim Stewart

26-Aug-03 10:13

Sure. Here[^] is the language spec on the subject.

class Text
{
   public Text(): this(0, 0, null) {}
   public Text(int x, int y): this(x, y, null) {}
   public Text(int x, int y, string s) {
      // Actual constructor implementation
   }
}

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Re: constructor calls constructor ( java: this(..) )

MeisterBiber26-Aug-03 10:42

MeisterBiber

26-Aug-03 10:42

thank you!
i didn't find this anywhere.

Custom control

Lasse Johansen26-Aug-03 9:16

Lasse Johansen

26-Aug-03 9:16

I have made a custom control, which have a property named Items. Items is a collection. This collection can in the designer be changed by using the collection-editor accessed from the property viewer.

My problem is when I add items through the designer(collection-editor) in the property viewer. After adding a new item, it is shown in the control, but do I reload the form(by closing the window, and open it again), the item is not present - not visually in my control and not in the collection-editor.
I see that after adding items using the collection-editor, no code are added to the InitializeComponent function. I wonder if you need to do something specific to have it added correctly to the parents InitializeComponent function?

Thanks in advance,
Gooky

Re: Custom control

Lasse Johansen26-Aug-03 9:50

Lasse Johansen

26-Aug-03 9:50

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

does the trick...

Gooky

Re: Custom control

Alvaro Mendez27-Aug-03 9:38

Alvaro Mendez

27-Aug-03 9:38

What do you add this to, the control's class or the property itself?

Thanks,
Alvaro

Hey! It compiles! Ship it.

Re: Custom control

Lasse Johansen27-Aug-03 9:54

Lasse Johansen

27-Aug-03 9:54

the property

Actually, you also need to make a typeconverter. I found an excelent article about it:

http://www.divil.co.uk/net/articles/designers/collectioncontrols.asp

Gooky

detect the connection

aguest26-Aug-03 8:42

aguest

26-Aug-03 8:42

hello
i search how to detect the connection and the deconection of the modem .
because i want to make an application who can tell if the connection is on or no?

Re: detect the connection

Ista26-Aug-03 16:07

Re: detect the connection

26-Aug-03 16:07

check out a search on your pc for wininet.h

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

Anonymous26-Aug-03 21:26

Anonymous

26-Aug-03 21:26

[System.Runtime.InteropServices.DllImport("wininet.dll")]
public static extern bool InternetGetConnectedState(IntPtr lpSFlags, int dwReserved);

getting rows in a dataviewmanager

zuhx26-Aug-03 8:27

zuhx

26-Aug-03 8:27

I created a dataviewmanager because i have dataset and want to provide different views on that that dataset. Is it possible to get the rows in a dataviewmanager? That is, I want to see the contents of the dataviewmanager. Does any one have any sample code?

Ignorant simple data binding ?

Ista26-Aug-03 8:27

active directory - DirectoryEntry

26-Aug-03 8:27

I have ccoCustomers and cboStoreLocation

Customer has multiple store Locations

if I have 2 DataTables one CUstomer(ID) and the other SotreLocation(CustomerID)

what is this best way to bind these together?

nick

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

devvvy26-Aug-03 7:42

devvvy

26-Aug-03 7:42

Just reading up on "active directory - DirectoryEntry", come across this code fragment:

DirectoryEntry de = new DirectoryEntry();
String schemaNamingContext = de.Properties["schemaNamingContext"][0].ToString();
String defaultNamingContext = de.Properties["defaultNamingContext"][0].ToString();

What's:
a. schemaNamingContext
b. defaultNamingContext

Don't have anything from MSDN...

norm

Ista26-Aug-03 16:09

26-Aug-03 16:09

Hell I even printed it out and read it over a Be*r!

nick

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

devvvy26-Aug-03 16:12

devvvy

26-Aug-03 16:12

Hey, thanks!

norm

Ista26-Aug-03 16:13

26-Aug-03 16:13

Funny, I'm using active directory to log people on my application and I was looking for something like that.

nick

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

devvvy26-Aug-03 16:18

devvvy

26-Aug-03 16:18

But, what is "naming context", it seems to me it means nothing more a LDAP path - therefore the phrase "context".

norm

Ista26-Aug-03 16:30