Re: Using FlagsAttribute? - C# Discussion Boards

17-Jul-02 23:10

Hi all, can someone please post an example of how to use the FlagsAttribute, specifically setting and unsetting the flags?

My code:

[Flags]
public enum StringFormat
{
    Normal = 1,
    Bold = 2,
    Underline = 4,
    Inverse = 8,
    Color = 16,
}

In my class:

 StringFormat format = StringFormat.Normal;
format = format | StringFormat.Bold; 
// i assume this sets flags to Bold, Normal??? 
// but why does the output show 3 instead of "Normal, Bold"?

What operators is needed to unset, for example, Bold? In the MSDN documentation they they have a Match() method. How does one use that?

Thanking all in advance Smile | :)

Cheers

READ MSDN

Nathan Blomquist18-Jul-02 1:48

Nathan Blomquist

18-Jul-02 1:48

Since you are using powers of 2, the OR instruction is just like an ADD instruction. Therefore can't you just subtract?

I don't know how to make it display combinations... perhaps overriding ToString()?

Later,
Nathan

---------------------------
Hmmm... what's a signature?

leppie18-Jul-02 3:35

18-Jul-02 3:35

Thx, thats exactly what i have now ended up doing, though it requires casting all members to int and then do the add, then cast back to enum type. Seems a bit like defeating the point thought Frown | :(

The only thin that seems to work like I want it to is checking whether a flag is active by:
if ((format & StringFormat.Bold) == 0) etc...
to test for example if Bold is active.

Or maybe I'm just missing the point completely Confused | :confused:

Thx anyways Smile | :)

READ MSDN

jparsons18-Jul-02 3:59

jparsons

18-Jul-02 3:59

Subtracting works, however it is nasty and generally not the way that you want to unset a flag. If you know that the Bold flag is set then you can use this to get rid of it.

<br />
format = format ^ StringFormat.Bold<br />

Note that this will toggle the Bold flag not erase it. So if it is set then it will unset it.

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

leppie18-Jul-02 4:18

18-Jul-02 4:18

Thx

jparsons wrote:
Note that this will toggle the Bold flag not erase it. So if it is set then it will unset it.

So if Bold is set "^" will unset it , and if Bold is unset "^" will set it?

READ MSDN

jparsons19-Jul-02 4:42

jparsons

19-Jul-02 4:42

leppie wrote:
So if Bold is set "^" will unset it , and if Bold is unset "^" will set it?

Yes. ^ is the xor symbol and it will toggle values essentially

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Eric Gunnerson (msft)18-Jul-02 5:03

Eric Gunnerson (msft)

18-Jul-02 5:03

You can unset by doing:

format = format & (0xFFFFFFFF ^ StringFormat.Bold);

The second expression gives you a vector with every bit set except the bold one, and then when you and that with format, you're assured that it's cleared.

If you have [Flags] on the enum, when you call ToString() on it, you'll get a comma-separated list of the set bits.

leppie18-Jul-02 6:02

Re: PropertyGrid issues...

18-Jul-02 6:02

thx all , at least i can progress on one area. Just to recap.

to unset: format = format & (0xFFFFFFFF ^ StringFormat.Bold);

to set: format = format | StringFormat.Bold;

Thanx again all Smile | :)

Now if only that damned richtextbox will start behaving

Mad | :mad:

READ MSDN

PropertyGrid issues...

Vu Truong17-Jul-02 21:24

Vu Truong

17-Jul-02 21:24

Hi all,

I encounter 2 following issues with PropertyGird:

1. Adding a NumericUpDown control into a PropertyGrid.
2. I cannot show a property which is not a enumeration type under a ComboBox in PropertyGrid.

Please help me to solve these issues. Thanks.

leppie17-Jul-02 22:05

Using SendMessage with web pages

17-Jul-02 22:05

Vu Truong wrote:
I cannot show a property which is not a enumeration type under a ComboBox in PropertyGrid.

You will need to implement a TypeConverter for your property.

Sorry I cant help you with Q1. Frown | :(

READ MSDN

Anonymous17-Jul-02 20:20

Anonymous

17-Jul-02 20:20

How can I determine the handle of a radio box or a button on a webpage? When I tried using Spy++ it only gave me the handle of the page area and this class: 'Internet Explorer_Server'. Can anyone help? Confused | :confused:

Re: Using SendMessage with web pages

Chris Rickard18-Jul-02 3:52

Chris Rickard

18-Jul-02 3:52

All of the HTML input controls with the exception of SELECT are Windowless. You cannot use regular Win32 techniques to play with them. Frown | :(

Rather you have to use MSHTML.

Re: Using SendMessage with web pages

Neophit19-Jul-02 20:04

Neophit

19-Jul-02 20:04

How do I use MSHTML?

-Neophit-

Re: Using SendMessage with web pages

Chris Rickard22-Jul-02 8:16

Chris Rickard

22-Jul-02 8:16

If you're really good with COM a quick search of MSDN for MSHTML will bring up all you need to get started. If you aren't all is not lost. You can achieve ~90% of anything you need to do with scripting.

If you explain what you're goal is i might be able to come up with a plan for achieving it.

DataSource for my ListBox

J. Ehrnström17-Jul-02 15:44

J. Ehrnström

17-Jul-02 15:44

I have two classes, let's call them MyClassA and MyClassB. The former extends a form and contains a listbox, the latter is more of a data class, containing an ArrayList.

As you've probably guessed by now, I want to fill my listbox in MyClassA with the contents of the array list in MyClassB. The array list contains regular strings.

In the constructor in MyClassA I've got:

public MyClassA
{
  InitializeComponents();
  myClassB = new myClassB();
  myListBox.DataSource = myClassB.myArrayList;
}

Unfortunately this does not work and I can't figure out why.

My next step was to try the same thing using an array list in MyClassA as data source. This works fine and the listbox is updated whenever the array list is.

Could anyone please tell me what I've missed? Are there any special considerations to make when using another class' member as data source? Do I have to use events or such?

Thanks in advance for any help!

UpLoading dll's or HttpWebRequest

Orion Buttigieg17-Jul-02 10:25

Orion Buttigieg

17-Jul-02 10:25

hello,

i'm trying to Upload dll's being generated on a Client machine(not ASP.NET)but rather UserControls and ComponentModel's. i'm getting lost in all the HttpWebRequest 'Post' and HttpPostedFile stuff. the later looking like its almost purely for ASP.NET.

any advice would be great?

Orion

Re: UpLoading dll's or HttpWebRequest

Orion Buttigieg17-Jul-02 10:32

Orion Buttigieg

17-Jul-02 10:32

just to be clearer, sorry.

presently the dll's are being saved on the client. i can get to them no problem. its sending them across the wire that's a problem.

i keep thinking HttpWebRequest is the way to go because i can state the URI. and in this case the files are going to a virtual directory. although its the content type that's got me since these are not text files.

thanks,

Orion

Progress Control

Nnamdi Onyeyiri17-Jul-02 9:27

Nnamdi Onyeyiri

17-Jul-02 9:27

Does anyone know how to make the Progress Control flat? and change the background colour and, if it not toooooo difficult, the colour of the bar?

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

SHaroz18-Jul-02 6:30

SHaroz

18-Jul-02 6:30

There is a good premade one if you look under C# controls on this site.

Nnamdi Onyeyiri18-Jul-02 6:33

Nnamdi Onyeyiri

18-Jul-02 6:33

are you talking about the System.Windows.Forms.ProgressBar? because thats the one im using, im just having trouble changing its colours.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

SHaroz18-Jul-02 6:37

SHaroz

18-Jul-02 6:37

http://www.codeproject.com/cs/miscctrl/progressbar.asp