Managed C++/CLI

Saksida Bojan1-Jun-05 19:40

1-Jun-05 19:40

If you are including the same header to the forms, instead using #pragma once
use Old Defenition style Example:

#ifndef _CORE_H_
#define _CORE_H_

public __gc class Core
{
//To Do:
};

#endif //_CORE_H_

With this you can use it from anywhere and you can include header into any file. Or multiple file. you will not get redefenition error

Lagwagon561-Jun-05 10:12

Lagwagon56

1-Jun-05 10:12

I had a similar problem. I just created a class that I pointed both forms to and used it to pass information between the forms.
So creat a new __gc class. From form1 create an object of that class. then point it to form2's object.
Pass is the class i'm using to pass information.

<br />
//Form1.h<br />
Pass *pass = new Pass();<br />
Form2 *input = new Form2(); <br />
input->pass1 = pass;<br />
input->ShowDialog();<br />
<br />
label_InputSomthing->Text = pass->somthing;<br />
Invalidate();<br />
<br />
//Form2.h<br />
Pass *pass1;<br />
pass1->something = textBox_something->Text;<br />
<br />
Close();<br />

richiemac1-Jun-05 21:32

1-Jun-05 21:32

Thaks guys I'll give it a go.

Saksida - will the old style definitions go inside the namespace tag or outside. e.g

#ifndef _CORE_H_
#define _CORE_H_
namespace test
{ ... }
#endif

or

namespace test
{
#ifndef _CORE_H_
#define _CORE_H_
...
#endif
}

richiemac1-Jun-05 22:37

1-Jun-05 22:37

Do I need to use the #indef definition in both forms or jsut the main one?? If I use it in both I get errors.

error C2143: syntax error : missing ';' before '*'
error C2501: 'test::Form1::form2' : missing storage-class or type specifiers
error C2501: 'test::Form1::f2' : missing storage-class or type specifiers

When I try to declare an instance of form2.

If I use it in the main form only I get only one error.

error C2011: 'test::form2' : 'class' type redefinition

I could do with some help here. I'm not very experienced with c++ let alone managed c++. Been on this for a couple of days and nothing I try wants to work.

Lagwagon562-Jun-05 4:27

Lagwagon56

2-Jun-05 4:27

Make sure to #include both your passing class and form2 in your form1.

Saksida Bojan2-Jun-05 20:10

2-Jun-05 20:10

Yes you need to use but not #indef but #ifndef

And of course you need outside namespace. This means it must be in the beginning of file #ifndef and #define

And on the end it must be #endif

If you realy want to have an example then download this:
http://users.volja.net/bsaksida/CDDVD Organizer.zip[^]

Look under Core Folder, you will see CDDVDcore.h and you will see how has been defined. this program verzion is 0.1 there are a lot of bugs. Don't wory this program will be released as opensource.

richiemac5-Jun-05 5:34

5-Jun-05 5:34

Thanks for the help guys. I've written a little test prog that I've managed to get going with your help.

Thanks again. Smile | :)

panel component problems

richiemac31-May-05 6:44

31-May-05 6:44

Hi all,

I'm trying to create a few panels in a VC++.net application. I need the panels to be visible on a number of screens and I don't want to reproduce the same components many times over. When I run my app the panel is only visible in one screen only no matter what I do.

I'm doing something along the lines of

<br />
private: System::Void application_menuItem_Click(System::Object *  sender, System::EventArgs *  e)<br />
		 {<br />
			 this->application_panel->Visible = true;<br />
			 this->low_level_panel->Visible = false;<br />
		 }<br />

which works for one screen but not if I select any other screen.

Any ideas gratefully recieved.

Christian Graus31-May-05 13:49

31-May-05 13:49

What do you mean by a screen ? A form ? How does this panel get to be on these forms ?

Christian Graus - Microsoft MVP - C++

richiemac31-May-05 21:47

31-May-05 21:47

Sorry for the poor explanation.

I have a form (Form1), that has two panels on (panel1, panel2). This is where I'm becoming stuck. Each panel is supposed to show a number of components with some of these components being on both. I've grouped these components together and added them to another panel (panel3). Form1 has a menu item which is used to choose panel1 or 2.

So I have something like

<br />
private: System::Void menuItem1_Click(System::Object * sender, System::EventArgs * e)<br />
{<br />
this->panel1->Visible = true;<br />
this->panel2->Visible = false;<br />
}<br />

to show the appropriate panel. Now what I also need to do is add panel3 to the visible panel. So I'm doing - or trying to do - something like

<br />
if ( this->panel1->Visible == true )<br />
{<br />
this->Controls->Add( this->panel3 );<br />
}<br />

But I can only get panel3 to show itself on one panel. Either panel1 or panel2 but never both.

Christian Graus31-May-05 21:51

31-May-05 21:51

I'd have thought the trick would be to move panel3 to be top in the z-order, so it is always visible above panel 1 OR 2, without adding it to either, just because it's part of the form.

Otherwise, do they have to be the same instance ? Perhaps you could create a control, add it to both panels, and then pass the data between the two so they look the same in terms of what is set on them ? Or do it using events ?

Christian Graus - Microsoft MVP - C++

richiemac31-May-05 22:43

31-May-05 22:43

So basically have panel3 floating over the other panels. How do you change the z-order (sorry but new to all this)? And will this then lock the panel to its correct location throughout the forms lifespan?

Christian Graus1-Jun-05 11:11

1-Jun-05 11:11

In managed C++ - use SetWindowPos to set the Z order to top. The panel shouldn't move, unless you tell it to.

Christian Graus - Microsoft MVP - C++

Christian Graus1-Jun-05 11:12

1-Jun-05 11:12

In MC++, use SetWindowPos with SWP_NOMOVE | SWP_NOSIZE and a position of TOP.

Christian Graus - Microsoft MVP - C++

richiemac6-Jun-05 0:16

6-Jun-05 0:16

Thanks for the help Christian.

Re: OleDB Question

Saksida Bojan1-Jun-05 19:34

Re: OpenFileDialog Problems

1-Jun-05 19:34

Also i have noticed that if i change select statment, there would not be any effect.

online users

K.A.L28-May-05 3:01

K.A.L

28-May-05 3:01

I would like to make a programme that list active users that are connected to my pc.
How do i get access to these information.
What should i look into?

OpenFileDialog Problems

vajjalu27-May-05 9:54

vajjalu

27-May-05 9:54

I have a button in a dialog which when clicked opens an OpenFileDialog box and the user can select a file. The problem I am facing is that when I try and copy the file & path using the FileName function into a CString, I keep getting a NULL value.

The thing is, the code works as intended in the debug mode but doesnt in the release mode.

Below is the code I am using:

void CDisColEnvDlg::OnBnClickedButtonLocalBrowse()
{
// TODO: Add your control notification handler code here
System::Windows::Forms::OpenFileDialog* appOpenFileDialog = new System::Windows::Forms::OpenFileDialog();
appOpenFileDialog->Filter = S"Trace File (*.tf1)|*.tf1";

if (appOpenFileDialog->ShowDialog() == System::Windows::Forms::DialogResult::OK)
{
CString szFileName = appOpenFileDialog->FileName;
AfxMessageBox(szFileName,MB_OK|MB_ICONINFORMATION,0);
}
}

Can anyone tell me what the problem potentially could be.

Also, is there a way to do this using unmanaged code?

Thanks in advance.

--
If a program is useless, it must be documented.

Christian Graus28-May-05 12:02

Re: OpenFileDialog Problems

28-May-05 12:02

vajjalu wrote:
Can anyone tell me what the problem potentially could be.

The string in the dialog is probably wide, try using _bstr_t.

vajjalu wrote:
Also, is there a way to do this using unmanaged code?

Yes, these dialogs exist in MFC, CFileDialog or COpenFileDialog or something. You can get at them without MFC as well, by filling a struct and passing it to an API function, I believe.

Christian Graus - Microsoft MVP - C++

Saksida Bojan29-May-05 4:56

29-May-05 4:56

In your toolbox you have OpenFileDialog and SaveFileDialog. It's preaty easy to use it

GUIs

newprog27-May-05 0:25

newprog

27-May-05 0:25

Hi there!

I'm making an application using managed C++, and i'd like to know how
i could change the default appearance,with an easy way,(without using GDI+) of the form in something more presentable.(e.g adding some graphics). Is there any class that impements graphics or changes the resources of the form?

thanks in advance.

Re: GUIs

ursus zeta28-May-05 7:49

ursus zeta

28-May-05 7:49

Yeah. And weirdly enough, it's called exactly that: Graphics.
Read this:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdrawing.asp[^]

To get started you would use the CreateGraphics method of your Form class. It's pretty simple really. The Graphics class encapsulates the Device Context that you're probably familar with from Win32.

Re: GUIs

Christian Graus28-May-05 12:03

28-May-05 12:03

The Graphics class is the CDC equivelant in GDI+. If you don't want to use GDI+ in terms of drawing stuff yourself, you may as well avoid that altogether and just use picture box controls to put some images on your form.

Christian Graus - Microsoft MVP - C++

Xml Question?

Saksida Bojan26-May-05 18:30

26-May-05 18:30

Hello.

I have an element with attributes. Now i want to change attribute of an element. But i dont want to delete element and add. I would apritiace if there would be example.

Thanks.

Re: Xml Question?

Christian Graus28-May-05 12:05