C# Discussion Boards - CodeProject

Re: OnIdle() - how do I override it in C#.

mcgahanfl15-Jul-03 7:50

15-Jul-03 7:50

private void Form1_Load(object sender, System.EventArgs e)

{

Application.Idle+= new EventHandler(this.OnIdle);

}

private void OnIdle(object sender, System.EventArgs e)

{

// Spams you with message boxes.

System.Windows.Forms.MessageBox.Show(this, "Idling");

}

Re: OnIdle() - how do I override it in C#.

Jim Stewart15-Jul-03 8:57

Jim Stewart

15-Jul-03 8:57

That:
McGahanFL wrote:
// Spams you with message boxes.
...would be my expectation. As I am not a MFC programmer, I do not know what the OnIdle() function does. I was guessing that the Idle event is the equivalent.

The help file for the Idle event states: Occurs when the application finishes processing and is about to enter the idle state. This seems to occur rather frequently.

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

DirectShow and C#

Brian JR14-Jul-03 11:37

Brian JR

14-Jul-03 11:37

I would like to create a .NET application using C# language since C# seems good for rapid application development. I would also like to create the GUI using the C# application wizard. (not MFC, or WTL!!!)

How can I use DirectShow AND the Microsoft Speech .NET SDK within the same application? All the DirectShow SDK examples are written in C++. All the .NET speech examples are written in C#. I've read that some people use "wrapper classes" to use C# with C++.

Can I write the bulk of my application in C# and use C++ only for the DirectShow portion of it? Is approach possible as well?

Also, I'd like to "skin" my application, or in the very least give it some "personality" with rounded buttons and some custom controls that I create myself. Can I still use the Win32 API and the "layered" windows feature to skin a GUI created with C#? Is there any other way of creating that "custom" look?

I'm new to this stuff and I'm really confused. What's worse, is that I read all kinds of information about "managed code" and how "...DirectShow does not use managed code.....DirectShow is built upon COM objects.... .NET allows one to mix managed and unmanaged code in the same application..." blah blah blah....it can get very confusing.

All I want is some direction and advice on what to do 1st, 2nd, 3rd... I just don't know where to start... I don't want to read a 400 page book on ATL and COM if I'll be using C# which hides the COM internals... you know what I mean?

Re: DirectShow and C#

Mazdak14-Jul-03 11:52

Mazdak

14-Jul-03 11:52

I show you two links in CodeProject about DirectShow in C#. Did you see them?

Mazy

No sig. available now.

Re: DirectShow and C#

Brian JR14-Jul-03 16:07

Brian JR

14-Jul-03 16:07

I've seen all the links in CodeProject.... CodeGuru.... DeveloperFusion.... Develop... blah blah blah....there's so many.... enough to confuse me... trust me.... I'm new to this stuff... I need a little direction on what to read....

For example: Can I create a C# forms application, then "wrapper" all the C++ unmanaged Directshow stuff into C# managed code? And also incorporate the speech SDK into the same application.

If the answer is "yes", then how much work am I looking at?
Thanks.
Brian

Re: DirectShow and C#

Mazdak14-Jul-03 20:30

Mazdak

14-Jul-03 20:30

Brian JR wrote:
Can I create a C# forms application, then "wrapper" all the C++ unmanaged Directshow stuff into C# managed code? And also incorporate the speech SDK into the same application

Yes you can. You have to write them in a dll and use them in your C# application. I think thats really hard work,but doable. Do you know how to use win32 API in C#? you can use your Dll,the same way as you use win32 API in C#,again there lots of articles about the topic like this one:

http://www.codeproject.com/csharp/c__and_api.asp[^]

Thasts all I can show you because I don't have experience of useing Directshow. Hope it helps.

Mazy

No sig. available now.

Re: DirectShow and C#

Brian JR15-Jul-03 7:52

Brian JR

15-Jul-03 7:52

Oh God... you're scaring me...

Re: DirectShow and C#

Brian JR15-Jul-03 8:57

Brian JR

15-Jul-03 8:57

OK. I found this type library for DirectShow: Seems like no one else has taken this approach. Do you know why?

http://www.kohsuke.org/dotnet/directshowTypelib/

Does this type library solve my problem of working with DirectShow in .NET? So I can use the type library to do MC++ and C# programming?

Brian

Re: DirectShow and C#

Brian JR17-Jul-03 9:03

Brian JR

17-Jul-03 9:03

Thanks!

Re: DirectShow and C#

Brian JR15-Jul-03 8:04

Brian JR

15-Jul-03 8:04

Ahhh... now I think it's starting to make sense! Thank you!
But how do I "derive" a C# class from a Managed C++ class?

"2. You can create GUI in C#, it's easy enough even for beginner. But if you want to create custom controls, I wouldn't advice.
The fastest way is to use controls created by someone or just "skin" your application as it's normally done with multimedia applications.

These "custom" controls - are you talking about ActiveX controls? Where do I get these custom controls? Can I put these custom controls into the C# form that I created?

Could you elaborate on the skinning process? What happens to the C# form I created when I perform the skinning process? Can the C# form and the skinning process co-exist? Also, when I trigger a menu item on my "skinned" application, and a submenu pops up, then how do I process to skin the submenu? That's what I'm confused about.

Any help would be greatly appreciated. Sounds like you are familiar with this process.
Brian

Re: DirectShow and C#

Brian JR15-Jul-03 8:50

Brian JR

15-Jul-03 8:50

OK. I found this template library for DirectShow: Seems like no one else has taken this approach. Do you know why?

http://www.kohsuke.org/dotnet/directshowTypelib/

Does this template library solve my problem of working with DirectShow in .NET? So I can use the template library to do MC++ and C# programming?

Brian

How can I Set a Key in a ImageList??

Acid197814-Jul-03 11:13

Acid1978

14-Jul-03 11:13

Hello all,

who can tell me how I can Set a Key in a ImageList?
thanks for all answers!

cu
Acid

Passing data through tiers with collections

haezeban14-Jul-03 10:33

haezeban

14-Jul-03 10:33

Hi,

I'am looking for examples or articles concerning following :

N-tier application :
Data layer -> gives datasets to the business layer
In the business layer we make collections (each row in dataset is an object in the collection).
Business layer and UI works with the collections.

Lets say in the UI we have a grid with all the objects of the collection. In this grid we can add, update and delete (objects in the collection).

What is the best way to go from the collection to the database?
Do I have to mentioned in each object if it is added, updated, deleted or not changed? Also each object have a timestamp to look if there are no changes in the database.
So, al the features of ADO.NET I can't use, because of the collection.

Is there someone who have any idea's?
Thanks in advance,
Vic

Opera Browser - GetClassName!

jesus4u14-Jul-03 10:18

jesus4u

14-Jul-03 10:18

I am trying to get the ClassName of the Opera browser and then read the url from the address bar but I can't seem to get the name of the address bar. What is it? I am using Spy++ and no luck. Other browsers' address bars are typically called "Edit" but not in Opera.

[code]
Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long

[/code]

Re: Opera Browser - GetClassName!

dynamic14-Jul-03 11:04

dynamic

14-Jul-03 11:04

i think you got my answer to your question on the dotnet forum , but here it is anyway Smile | :)

btw it's vb.net ( this is a C# section ) Wink | ;)

VB:

<font color="blue">Private</font> <font color="blue">Declare</font> <font color="blue">Function</font> FindWindow <font color="blue">Lib</font> "user32.dll" <font color="blue">Alias</font> "FindWindowA" (<font color="blue">ByVal</font> lpClassName <font color="blue">As String</font>, <font color="blue">ByVal</font> lpWindowName <font color="blue">As String</font>) <font color="blue">As Integer</font>
    <font color="blue">Private</font> <font color="blue">Declare</font> <font color="blue">Function</font> GetClassName <font color="blue">Lib</font> "user32.dll" <font color="blue">Alias</font> "GetClassNameA" (<font color="blue">ByVal</font> hwnd <font color="blue">As Integer</font>, <font color="blue">ByVal</font> lpClassName <font color="blue">As</font> System.Text.StringBuilder, <font color="blue">ByVal</font> nMaxCount <font color="blue">As Integer</font>) <font color="blue">As Integer</font>


    <font color="blue">Private</font> <font color="blue">Sub</font> Button1_Click(<font color="blue">ByVal</font> sender <font color="blue">As</font> System.Object, <font color="blue">ByVal</font> e <font color="blue">As</font> System.EventArgs) <font color="blue">Handles</font> Button1.Click
        <font color="blue">Dim</font> x <font color="blue">As Integer</font> = FindWindow("OpWindow", vbNullString)
        <font color="blue">Dim</font> s <font color="blue">As</font> System.Text.StringBuilder = <font color="blue">New</font> System.Text.StringBuilder(255)
        GetClassName(x, s, s.Capacity)
        MessageBox.Show("the opera browser's hwnd is: " & x & Chr(13) _
        & "the window name is: " & s.ToString)
    <font color="blue">End</font> <font color="blue">Sub</font>

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

xml comment tags

stonee7414-Jul-03 9:06

stonee74

14-Jul-03 9:06

Hi there,
I am havin an enormous amount of c++ comments

/**
blabla
**/

to be translated into xml tags

///<summary>
/// blabla
///</summary>

is there a way to automate this in vs .net 2003

thaks,
stonee

Re: xml comment tags

Daniel Turini14-Jul-03 9:36

Daniel Turini

14-Jul-03 9:36

stonee74 wrote:
is there a way to automate this in vs .net 2003
Macros.

ORACLE One Real A$#h%le Called Lary Ellison

Re: xml comment tags

Eric Gunnerson (msft)14-Jul-03 11:27

Eric Gunnerson (msft)

14-Jul-03 11:27

You could do it with macros, but I don't think I would. I'd be more likely to write a C# program that opened the file and used regex to do the replacements. I'd use a regex something like:

Regex regex = new Regex(@"
/\*\* # start of comment
\s+
(?<comment> # capture to named Comment
.+?\s+ # comment text
) # end of capture
\s+
\*\*/ # end of comment.",
RegexOptions.Singleline |
RegexOptions.IgnorePatternWhitespace);

and then use a MatchEvaluator function like:

static public string Evaluator(Match match) {
string[] lines = match.Groups["Comment"].Value.Split('\n');
for (int i = 0; i < lines.Count; i++)
lines[i] = "///" + lines[i];
return String.Join("\n", lines);
}

WebBrowser bug- application won't die.

Bog14-Jul-03 8:59

Bog

14-Jul-03 8:59

If you put a WebBrowser control in a Form, and then put that Form inside another Form (set it's Parent to the other form and set TopLevel to false, which is perfectly legal according to the docs), then when you quit your application (close the outer Form), it will stay resident in memory and eat up 100% of CPU time. (You can see it doing this in the Task Manager). This is probably caused by that OLEinPlace stuff somehow but I don't know OLE so that's totally a guess.

This is a HUGE problem for me. MASSIVE!!

Dead | X|

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

How can I make one Form show another?

Anonymous14-Jul-03 8:26

Anonymous

14-Jul-03 8:26

Hello all,

Here's my problem. I have a Windows Form with some controls on it. When the user clicks a button, I want a second form to appear, and the first one to be hidden. I've drawn up both forms, so how can I make Form1 display Form2?

Thanks!

Re: How can I make one Form show another?

J. Dunlap14-Jul-03 8:34

J. Dunlap

14-Jul-03 8:34

Form2 frm=new Form2();
frm.Show();
this.Hide(); //or this.Close();

Anonymous? Frown | :(

"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: How can I make one Form show another?

Anonymous14-Jul-03 8:36

Anonymous

14-Jul-03 8:36

Thanks. Sorry for posting Anon. I forgot my password and I'm on a coding spree, so don't want to hunt it down. Smile | :)

Re: How can I make one Form show another?

J. Dunlap14-Jul-03 8:44

J. Dunlap

14-Jul-03 8:44

Ok.

"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

Actually I do have one more question

Anonymous14-Jul-03 8:46

Anonymous

14-Jul-03 8:46

I have one other detail I hope you won't mind answering. When the second form is closed via the close button (next to the minimize and maximize buttons in the upper right) the second form is disposed. However, Form1 remains, albeit hidden. So the program doesn't terminate.

I've tried calling Form1.Dispose() after Form2 is shown but that just quits the program. Any thoughts on how I can make the program quit when the user clicks the X?

Re: Actually I do have one more question

J. Dunlap14-Jul-03 8:48

J. Dunlap

14-Jul-03 8:48

You'll want to do this.Close(), not this.Hide. But that will release the ref to Form2, which may make it close, too. How about

Application.Run(new Form2());
this.Close();

"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

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.