Managed C++/CLI

23-Aug-08 3:58

Hi, I need use two forms in application. Is some easy way exists? I do that in Delphi, but in C++/CLI Win Form app is something understandable. I was googling for some easy practise, but not found it.
Is there something who help me with piece of code for two forms?

teejayem23-Aug-08 4:50

23-Aug-08 4:50

you can use multiple forms in C++/CLI. Just right click on your project and click "Add new Item..."

Don't be overcome by evil, but overcome evil with good

Polar_Sheep23-Aug-08 10:48

23-Aug-08 10:48

Sure, but I cant use (in example) in Form1 ->

Form1.Visible = true; OK
Form2.Show = true; it doesnt know Form2

(I maybe use :: )

I must include something to Form1?

dybs23-Aug-08 11:40

dybs

23-Aug-08 11:40

You can create 2 separate forms just as teejayem suggested, but if you want them completely independent of each other (i.e. Form2 is not a child of Form1), then you need to modify your <project_name>.cpp file that opens your main form. This file contains your main loop, and probably has a line like

Application::Run(gcnew Form1());

You would need to change this to create your Form1 and Form2 objects, show them, and then start your application. You might need a DoEvents loop, but there might be a way around that.

Dybs

teejayem23-Aug-08 12:25

23-Aug-08 12:25

You have to include the form2.h in your form1.h file for you to be able to use it

#include "Form2.h"

also "Show" isn't a property, it is a method. You shouldn't be trying to assign a boolean to it

Don't be overcome by evil, but overcome evil with good

Polar_Sheep23-Aug-08 18:13

23-Aug-08 18:13

Thank you, it works, but there is still little problem.

Form1::Visible = false;<br />
<br />
                // I must create Form2, how can I do that?<br />
                // Cannot use System::Windows::Forms::Form^ Form2 = gcnew System::Windows::Forms::Form;<br />
                // It will be new form, but I need my Form2<br />
<br />
Form2->Show();              // non-static member, I must use ->

teejayem23-Aug-08 18:25

Re: Multiple Forms [modified]

23-Aug-08 18:25

I'm guessing that is because your varaible name is the same as your class name. so the compiler is thinking your trying to call a static method. Change your variable name to something more unique

System::Windows::Forms::Form^ myFrm2 = gcnew System::Windows::Forms::Form()

myFrm2->Show()

Don't be overcome by evil, but overcome evil with good

Polar_Sheep23-Aug-08 19:28

23-Aug-08 19:28

Oh, thank you for your help. I was googling with "c++\cli" AND "#include"Form2.h"" and I found solution. It was that what you wrote. Same name Form2. THANK YOU

modified on Sunday, August 24, 2008 1:43 PM

OpenFileDialog example

bkelly1322-Aug-08 14:03

bkelly13

22-Aug-08 14:03

I need a simple example on how to use OpenFileDialog(). I don't want to extend it or enhance it (I did search for articles), just use it. Even after searching the entire Visual Studio directory, I cannot find the right files to include so that the compile stops telling me that OpenFileDialog is an undeclared identifier.

Do you have a link that will help me out?
Thank you.

Thanks for your time

teejayem22-Aug-08 15:43

22-Aug-08 15:43

example

to use this class you need to include the System.Windows.Forms assembly and add the namespace on top of your .h

Don't be overcome by evil, but overcome evil with good

bkelly1323-Aug-08 3:15

bkelly13

23-Aug-08 3:15

Hello teejayem,
I feel like there are too many questions to ask. I check your example link, but Microsoft leaves so much out and is so different from my code that I don’t understand it.

RE: to use this class you need to include the System.Windows.Forms assembly and add the namespace on top of your .h

Does this mean to put the below at the top of my .h file?

#include “System.Windows.Forms”
using System.Windows.Forms

The on button function in my code, created by VS, starts like this:

void Ctest1Dlg::OnBnClickedSelectLogFileButton()
{

And does not look anything like the example code:

void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{

I read about the ^ character and still don’t make any sense of that.

I wonder why we need more obscure characters in C++. It seems like we are trying to turn C++ into APL.

And just to be certain, I am using Visual Studio 2008 under Windows XP Home.

Thanks for your time

teejayem23-Aug-08 4:49

23-Aug-08 4:49

"RE: to use this class you need to include the System.Windows.Forms assembly and add the namespace on top of your .h"

you need to add the namespace like:

using namespace System::Windows::Forms;

"I read about the ^ character and still don’t make any sense of that."

"In C++/CLI the only type of pointer is the normal C++ pointer, and the .NET reference types are accessed through a "handle", with the new syntax ClassName^ instead of ClassName*"

Source[^]

"I wonder why we need more obscure characters in C++. It seems like we are trying to turn C++ into APL."

Hopefully you are talking about C++/CLI and not pure C++! You cannot use managed classes in a pure C++ application.

Don't be overcome by evil, but overcome evil with good

Mark Salsbery23-Aug-08 10:23

Mark Salsbery

23-Aug-08 10:23

bkelly13 wrote:
I wonder why we need more obscure characters in C++. It seems like we are trying to turn C++ into APL.

C++/CLI should be treated as a separate language.

C++ is still C++. No obscure characters have been added.

Are you sure C++/CLI is what you want to use? There's also
a way to use the open file common dialog from native C++.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

bkelly1323-Aug-08 10:51

bkelly13

23-Aug-08 10:51

Hello Mark,
RE: Are you sure C++/CLI is what you want to use? There's also
a way to use the open file common dialog from native C++.

No, I am not sure at all I want to mess with this. I activated Help from my Visual Studio to find out how to open a dialog for opening a file. I wound up here, but I am not at all sure where I want to be.

Thanks for your time