Re: Do I have to use pointers only? - Managed C++/CLI Discussion Boards

Alexandru Savescu3-Jun-02 11:55

3-Jun-02 11:55

Again with some newbie question.

I have started a C# windows application and it look really nice with all those new controls and the WinForms stuff (looks much more to Delphi than VB 6 though Wink | ;)

). I was wondering how I can use WinForms in MC++? I mean draging and dropping WinForms components on the managed form and stuff like that.

Thanks

Best regards,
Alexandru Savescu

Re: WinForms?

James T. Johnson3-Jun-02 12:27

James T. Johnson

3-Jun-02 12:27

You can't

MC++ lacks the CodeDOM support which is required for a visual designer to write the neccesary code.

James

Simplicity Rules!

Re: WinForms?

Rama Krishna Vavilala3-Jun-02 15:42

Rama Krishna Vavilala

3-Jun-02 15:42

Check this out. If you have VB6 you can use the designer. I have not yet tried it.

http://www.gotdotnet.com/userfiles/toml/VBWinForms.zip

Re: WinForms?

Nish Nishant3-Jun-02 19:31

Nish Nishant

3-Jun-02 19:31

http://www.codeproject.com/useritems/mcppwinforms01.asp

http://www.codeproject.com/managedcpp/mcppwinforms02.asp

http://www.codeproject.com/useritems/mcppoutlookgui.asp

Nish

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

Re: WinForms?

Alexandru Savescu4-Jun-02 6:41

Alexandru Savescu

4-Jun-02 6:41

Thanks Nish, but as you said in the first article, there is now GUI support in Manage C++ Frown | :(

Best regards,
Alexandru Savescu

Re: WinForms?

Nish Nishant4-Jun-02 17:30

Nish Nishant

4-Jun-02 17:30

Alexpro wrote:
Thanks Nish, but as you said in the first article, there is now GUI support in Manage C++

Yeah, that's really sad!!!

Nish Frown | :(

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

Do I have to use pointers only?

Alexandru Savescu2-Jun-02 21:57

Alexandru Savescu

2-Jun-02 21:57

Hi!

I just my first semi-project in .NET that combines both MFC and MC++ and it works fine! However, when I needed to use any .NET classes I had to declare them as pointers and pass pointers to methods etc., like this

SqlConnection* s = new SqlConnection();
f (s);

Is this the only way it works? Confused | :confused:

Apparently yes, and I feel sad, I've been using C++ for a while and got used to using references and not pointers.... Rose | [Rose]

Best regards,
Alexandru Savescu

Re: Do I have to use pointers only?

Nish Nishant3-Jun-02 4:20

Nish Nishant

3-Jun-02 4:20

You'll have to create all reference types on the heap. Thus you cannot have a String but only a String*.

On the other hand you can have value types on the stack.

Nish

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

Re: Do I have to use pointers only?

Alexandru Savescu3-Jun-02 6:27

Alexandru Savescu

3-Jun-02 6:27

Thanks Nish, but could you please provide me with some examples with those differences?

Thanks.

Best regards,
Alexandru Savescu

Re: Do I have to use pointers only?

Nish Nishant3-Jun-02 7:57

Nish Nishant

3-Jun-02 7:57

Alexpro wrote:
Thanks Nish, but could you please provide me with some examples with those differences?

//String has to be on the heap
//It's an __gc class
String *s = new String("hey there");

//Point is a value type
Point p = Point(10,19);

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

Re: Do I have to use pointers only?

Alexandru Savescu3-Jun-02 9:24

Alexandru Savescu

3-Jun-02 9:24

Thanks! I better lookup in the documentation to see the difference between refernce types and value types! Unsure | :~

Best regards,
Alexandru Savescu

Re: Do I have to use pointers only?

Nish Nishant3-Jun-02 17:59

Nish Nishant

3-Jun-02 17:59

Alexpro wrote:
Thanks! I better lookup in the documentation to see the difference between refernce types and value types!

Have fun Smile | :)

Nish

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

OnKeyPress oddity

Nish Nishant1-Jun-02 22:23

Nish Nishant

1-Jun-02 22:23

I am deriving a class from ComboBox. I override OnKeyPress. But OnKeyPress never gets called! Anyone knows whether there is anything special I need to be doing?

Nish

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

Re: OnKeyPress oddity

Nish Nishant2-Jun-02 1:22

Nish Nishant

2-Jun-02 1:22

Well

It's not an MC++ issue here. The same thing happens when I use C# Frown | :-(

Nish

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

Re: OnKeyPress oddity

James T. Johnson2-Jun-02 12:35

James T. Johnson

2-Jun-02 12:35

Ensure that IsInputKey/Char returns true for that key; if it returns false you won't get the OnKey* events.

James

Simplicity Rules!

Re: OnKeyPress oddity

Nish Nishant2-Jun-02 17:11

Nish Nishant

2-Jun-02 17:11

James T. Johnson wrote:
Ensure that IsInputKey/Char returns true for that key; if it returns false you won't get the OnKey* events.

You mean in addition to overriding OnKeyPress I also need to override IsInputKey ???

Nish

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

Re: OnKeyPress oddity

Nish Nishant2-Jun-02 17:15

Nish Nishant

2-Jun-02 17:15

I did this :-

protected override bool IsInputKey(System.Windows.Forms.Keys keyData)
{
    base.IsInputKey(keyData);
    return true;
}

But still OnKeyPress never gets called!

Nish

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

Re: OnKeyPress oddity

Rama Krishna Vavilala2-Jun-02 17:48

Rama Krishna Vavilala

2-Jun-02 17:48

Use Anakrino. When you have anakrino you don't need to ask any quetions anywhere. Smile | :)

Re: OnKeyPress oddity

Nish Nishant2-Jun-02 17:56

Nish Nishant

2-Jun-02 17:56

Rama Krishna wrote:
Use Anakrino. When you have anakrino you don't need to ask any quetions anywhere

How do I use Anakrino in this situation, Rama? My problem is that a handler is not getting called in the derived class despite the fact that I have overridden it Frown | :-(

Nish

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

Re: OnKeyPress oddity [getting worse]

Nish Nishant2-Jun-02 18:19

Nish Nishant

2-Jun-02 18:19

I overrode WndProc and found that the WM_KEYDOWN message is not being received Frown | :-(

protected override void WndProc(ref System.Windows.Forms.Message m)
{
    base.WndProc(ref m);
    if(m.Msg == 0x0100)
        Text = "Hello World";
}

Nish

p.s. In an MC++ program I can #include windows.h to get the defines for various messages, in a C# program how do I get the defines for messages. Above I have hardcoded 0x0100 [WM_KEYDOWN]

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

Re: OnKeyPress oddity [getting worse]

James T. Johnson3-Jun-02 7:07

James T. Johnson

3-Jun-02 7:07

Find in Files for WM_KEYDOWN Poke tongue | ;-P

There are a couple programs out there which will let you get the constants but I find it much easier to just do a Find in Files.

James

Simplicity Rules!

Re: OnKeyPress oddity [getting worse]

Nish Nishant3-Jun-02 8:05

Nish Nishant

3-Jun-02 8:05

James T. Johnson wrote:
Find in Files for WM_KEYDOWN

Blast!!!

Of all things, a Jambo joke!!!

Boooohhhhhhhhh!

We don't want Jambo jokes! Booooooooooo!

We want jambo-edited articles Wink | ;-)

Nish

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

Re: OnKeyPress oddity [getting worse]

James T. Johnson3-Jun-02 12:18

James T. Johnson

3-Jun-02 12:18

Nish - Native CPian wrote:
We want jambo-edited articles

I'll get back to editing once I figure out what has caused me headaches the past 2 days.

James

Simplicity Rules!

Re: OnKeyPress oddity [getting worse]

Rama Krishna Vavilala3-Jun-02 7:17

Rama Krishna Vavilala

3-Jun-02 7:17

Incidentally there was a discussion about this in one of my articles

Link

Don't use WndProc, use PreProcessMessage.

Re: OnKeyPress oddity [getting worse]

Nish Nishant3-Jun-02 8:06

Nish Nishant

3-Jun-02 8:06

Rama Krishna wrote:
Incidentally there was a discussion about this in one of my articles

Link

Thanks. Checked it out!

Nish

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

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