Re: Quick Question - C# Discussion Boards

Re: FileAttributes question

Rickard Andersson²⁰2-Jun-02 7:59

Rickard Andersson²⁰

2-Jun-02 7:59

Try this:

(file is a FileInfo object)

if(file.Attributes == FileAttributes.ReadOnly)
{
   // The file is read only!
}

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C# and C++!

Re: FileAttributes question

Mazdak2-Jun-02 8:04

Mazdak

2-Jun-02 8:04

Have you test this one Rickard? Smile | :)

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Re: FileAttributes question

Rickard Andersson²⁰2-Jun-02 8:10

Rickard Andersson²⁰

2-Jun-02 8:10

As I said to you in my reply... your answer is the right one! Big Grin | :-D

And no, I have not try that... I just thought that would be how you found out if it was read only or not! Smile | :)

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C# and C++!

Re: FileAttributes question

ygxdha2-Jun-02 16:15

ygxdha

2-Jun-02 16:15

your code can pass the compiler.
but if the file have another attribute besides "readonly",your code can't work right.

Re: FileAttributes question

Humpo3-Jun-02 23:26

Humpo

3-Jun-02 23:26

i had a similar problem, i need to check if a file is a Directory, but ignore directory’s with System and/or Hidden attributes.

Thought my solution might be of some use if you need an example of how to check for more than one attribute. Also as i only started using C# 2 days ago maybe some expert can tell me if my solution is the best for what I’m trying to do, or if there is simpler method.

FileAttributes att = fsi[i].Attributes; //fsi = array of FileSystemInfo Smile | :)

bool bDirectory = (!((att & FileAttributes.Hidden) !=0) && // dont want hidden folders
((att & FileAttributes.Directory) !=0) &&
!((att & FileAttributes.System)!=0)); // dont want system folders

if(bDirectory)
//do something with fsi[i] - a directory Smile | :)

Quick Question

Nick Parker2-Jun-02 6:17

Nick Parker

2-Jun-02 6:17

How can I globally share variables across forms?

i.e. - form2 sets a variable that form1 can use and vice versa

Thanks Smile | :)

Nick Parker

Re: Quick Question

Rickard Andersson²⁰2-Jun-02 7:51

Rickard Andersson²⁰

2-Jun-02 7:51

With a property can you do that.
I have done that!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C# and C++!

Re: Quick Question

Joshua Nussbaum2-Jun-02 21:41

Joshua Nussbaum

2-Jun-02 21:41

A good method is using a singleton class that is loaded on demand.

MyAppSettings - a class that is the equivalent of a global variable:

public class MyAppSettings {

// make private since class should not be intatiated directly
private MyAppSettings() {
// ...
}

// this one property
public string Setting1 {
get {
// read the data from a database or from a file
}
set {
// save the data to a database or file
}
}

private static MyAppSettings _settings = null;
public static MyAppSettings Instance {
get {
if (_settings == null)
_settings = new MyAppSettings();

return _settings;
}
}
}

Not only does this class define global variables, but it insures that only one instance of the data is floating around.
To access you global data:

MyAppSettings.Intance.Setting1 = "xyz";

hope this helps

Object unknown

sharon2-Jun-02 1:43

sharon

2-Jun-02 1:43

Is there a way I can use an object without knowing which object it realy is? for exemple: I have several objects that implement IEnumerable(these objects has arrayList), I need to Implement IEnumerator and I want to do it once. but I don't know for which object I implement it for so when I do : object.arrayList[i] -its an error.
(object doen't have an arrayList property). how can I do it???

thanks in advance , sharon

Re: Object unknown

James T. Johnson2-Jun-02 12:14

James T. Johnson

2-Jun-02 12:14

Ahhh, the beauty of programming via interfaces Smile | :)

[contractual I think is the term]

IEnumerable ie = myobject as IEnumerable
 
if( ie != null )
{
  // myobject implements IEnumerable so do something with it
  IEnumerator = ie.GetEnumerator();
  ...
}

HTH,

James

Simplicity Rules!

Platform Invoke .... Qn

Kannan Kalyanaraman2-Jun-02 0:10

Kannan Kalyanaraman

2-Jun-02 0:10

I need to know how to call the following win32 api from c#

<br />
BOOL SystemParametersInfo(<br />
			UINT uiAction,  // system parameter to retrieve or set<br />
			UINT uiParam,   // depends on action to be taken<br />
			PVOID pvParam,  // depends on action to be taken<br />
			UINT fWinIni    // user profile update option<br />
			);<br />

I tried with the following PInvoke syntax

<br />
[DllImport("user32.dll")]<br />
	public static extern bool SystemParametersInfo(int uiAction,<br />
		int uiParam,object pvParam,int fWinIni);<br />

Is substituting object for pvoid okay, where can I find more Info. on this (how do i do substituiton) other than msdn.
Now I need to pass on the address of a Rect to the above function...
the exact win32 api call looks like this...

<br />
::SystemParametersInfo(SPI_GETWORKAREA, 0, &rectSomething, 0);<br />

How do i do this in C#.

Thanks
Kannan Smile | :)

Re: Platform Invoke .... Qn

Nish Nishant2-Jun-02 0:20

Nish Nishant

2-Jun-02 0:20

Kannan Kalyanaraman wrote:
Is substituting object for pvoid okay

No! Use IntPtr instead.

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Focus

Mazdak1-Jun-02 23:00

Mazdak

1-Jun-02 23:00

Does anybody know how can I find out which window has the focus from my program?

Thanks

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Re: Focus

Nish Nishant2-Jun-02 0:22

Nish Nishant

2-Jun-02 0:22

Mazdak wrote:
Does anybody know how can I find out which window has the focus from my program?

You'll have to invoke the API I guess

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: Focus

Mazdak2-Jun-02 0:29

Mazdak

2-Jun-02 0:29

Nish - Native CPian wrote:
You'll have to invoke the API I guess

You mean .NET does not have something for that I have to use win32? Dead | X|

I don't like it if I have to do it that way. Roll eyes | :rolleyes:

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Re: Focus

Nish Nishant2-Jun-02 0:37

Nish Nishant

2-Jun-02 0:37

Mazdak wrote:
You mean .NET does not have something for that I have to use win32? I don't like it if I have to do it that way.

I might be wrong Mazy! I guess we both can wait for James Johnson to come back from his weekend trips to answer this question!

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: Focus

Mazdak2-Jun-02 0:39

Mazdak

2-Jun-02 0:39

Nish - Native CPian wrote:
I guess we both can wait for James Johnson to come back from his weekend trips to answer this question!

Yes,we have to wait for C# man of CP. Big Grin | :-D

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Re: Focus

Nish Nishant2-Jun-02 0:36

Nish Nishant

2-Jun-02 0:36

Mazdak wrote:
Yes,we have to wait for C# man of CP

Cool! James - The CP C#er

Nish Smile | :)

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: Focus

James T. Johnson2-Jun-02 12:21

James T. Johnson

2-Jun-02 12:21

Nish - Native CPian wrote:
James - The CP C#er

LOL! Smile | :)

James

Simplicity Rules!

Re: Focus

Rocky Moore2-Jun-02 10:03

Rocky Moore

2-Jun-02 10:03

Mazdak wrote:
Does anybody know how can I find out which window has the focus from my program?

If you are talking about just getting the currently active WinForm in a non-mdi application it would be

System.Windows.Forms.Form.ActiveForm

If you wish to know which control it would be

AciveForm.ActiveControl

For a MDI it would be

System.Windows.Forms.ActiveMDIChild

If you are referring to any windows external to your application, I believe you will need to use the Win API.

Rocky Moore

Re: Focus

Mazdak2-Jun-02 10:14

Mazdak

2-Jun-02 10:14

Thank you Rocky.

Rocky Moore wrote:
If you are referring to any windows external to your application

Yes,I want external windows. Smile | :)

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Re: Focus

James T. Johnson2-Jun-02 12:23

James T. Johnson

2-Jun-02 12:23

As Nish said, and you feared; you have to resort to the Win32 API. This is because you can't create a Control object (the base class for Form) from an arbitrary HWND, only for one which a Control object already exists.

Perhaps in V.NEXT we'll have such support for a limited window class Smile | :)

James

Simplicity Rules!

Re: Focus

Mazdak2-Jun-02 19:19

Mazdak

2-Jun-02 19:19

Thank you James. Smile | :)

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Multiple forms

Paddy1-Jun-02 20:02

Paddy

1-Jun-02 20:02

I know this is a very basic question but could someone please tell me how to create for example a dialog box for getting user settings ect for my application, or even an about dialog box. Is it as simple as right clicking in the explorer and adding another windows form? If so how do I get my program to display it?
Thanks in advance,
Paddy.

Re: Multiple forms

Mazdak1-Jun-02 22:57

Mazdak

1-Jun-02 22:57

Paddy wrote:
Is it as simple as right clicking in the explorer and adding another windows form?

Yes.
Paddy wrote:
If so how do I get my program to display it?

YourFrm frm = new YourFrm();
frm.ShowDialog();

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

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