a c++ class library/dll in your c# project - C# Discussion Boards

Re: a c++ class library/dll in your c# project

22-Aug-09 5:58

hi, i would like to have some help with the following.

i made a c++ class library and added this to my c# project.
i would like to store some data in this class and retrieve this data when needed.

this class compiles and i can find it in the c# bin folder of my project.

i have done a litle reading on the subject, but it's not very clear to me.

http://support.microsoft.com/kb/828736[^]
http://msdn.microsoft.com/en-us/library/ms235591.aspx[^]

as non universitary professional coder.
i have made some MFC experience in the visual studio 2003 era, but ....
: )
but i stil would like to know how it's done.

can any show me how it's done?

i have the following files in the c++ project.
Header Files
- authentication.h
- resource.h
- Stdafx.h

Source Files
- AssemblyInfo.cpp
- authentication.cpp
- Stdafx.cpp

containing of the authentication.C file

// This is the main DLL file.

#include "stdafx.h"

#include "authentication.h"

please show how to store/set from c# a value in that c++ dll and retrieve it back to c#.

kind regards and thank you for your time

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Hristo-Bojilov22-Aug-09 6:25

Hristo-Bojilov

22-Aug-09 6:25

Is your c++ library COM or native library?
See the samples here for calling native libary from .NET and here using COM objects into managed code. Smile | :)

Life is a stage and we are all actors!

Re: a c++ class library/dll in your c# project

Natural_Demon22-Aug-09 6:32

Re: a c++ class library/dll in your c# project

22-Aug-09 6:32

i don't know, that'as why i ask.

i simply added a basic (not ATL, MFC or whatever) c++ class library project to my c# project.

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Hristo-Bojilov22-Aug-09 6:59

Hristo-Bojilov

22-Aug-09 6:59

I suppose your library is native.Follow this link for quick and easy sample how to consume C/C++ code in C#. Smile | :)

Life is a stage and we are all actors!

Block parent form

Dominik Reichl22-Aug-09 4:21

22-Aug-09 4:21

Hello,

I've got a main form and a status form. The status form is displayed non-modally (Show method), and updated using Application.DoEvents() while working on a bigger job.

Now the problem is that the main form is not blocked while performing the job. Both the status form and the main form can be focused. What I'd like to have is that the main form is blocked and redirects the focus to the status form, just like it would be the case for modal dialogs. Is this possible?

I tried setting the Owner property of the status form to the main form, but it didn't have any effect. The ParentForm property is read only, and the Parent property only applies to standard controls, not forms...

Thanks and best regards
Dominik

PS: Moving the job to another thread isn't possible.

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Dominik Reichl22-Aug-09 6:18

22-Aug-09 6:18

I've now implemented the following: when the main form runs into the Activated event, I'm calling the Activate method of the status form.

This way the main form is somewhat blocked, but there's still the disadvantage that visually the main form still draws the controls as if they could get the focus (for example the main menu items are highlighted when hovering over them). If you know a way how to disable/solve this, please let me know.

Thanks and best regards
Dominik

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Natural_Demon22-Aug-09 6:19

22-Aug-09 6:19

can't you try to add a this.Click event to the form and captures the user's click and bring the focus the other form?

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Dominik Reichl22-Aug-09 6:49

22-Aug-09 6:49

See above

Thanks for the reply anyway, best regards
Dominik

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Natural_Demon22-Aug-09 7:07

22-Aug-09 7:07

you can also use panels in the mainform, switch to a panel with the text 'please wait' and switch back after your other jobs finish.

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Xmen Real 22-Aug-09 7:09

22-Aug-09 7:09

this.Enabled = false;

will it work ?

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Dominik Reichl22-Aug-09 8:17

22-Aug-09 8:17

Yes, this prevents visual effects on hovering, but also grays out all dialog elements (which is actually good I guess).

Thanks and best regards
Dominik

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Saksida Bojan22-Aug-09 12:02

Saksida Bojan

22-Aug-09 12:02

If you call sub form non-modally, it will run in diffrent thread. Why do you want to use non modally?

And if you want to block executing main form and wait till status form is finished, it is easy if you called it modally with ShowDialog() method.

And if you insist in non moddaly, make some static variable in status form boolean type, and in the main forum ovverride focused event

PS: Moddaly and non moddaly means only that it runs either in diffrent or same thread

Permanent connection with webserver

Luc Pattyn22-Aug-09 13:29

Luc Pattyn

22-Aug-09 13:29

Saksida Bojan wrote:
Moddaly and non moddaly means only that it runs either in diffrent or same thread

I don't think so. It means they use different message pumps, however all message pumps are executed (one at a time) by one and only one thread.

Here is an experiment to prove it:
- create main form Form1 with a ListBox and a Button; it will be shown modelessly;
- create Form2 with a ListBox and a Button; it will be shown modally;
- add the following to Form1:

public partial class Form1 : Form {
    int count;

    public Form1() {
        InitializeComponent();
    }

    public void log(string s) {
        lb.Items.Add(s);
    }

    private void button1_Click(object sender, EventArgs e) {
        log("Thread ID="+Thread.CurrentThread.ManagedThreadId);
        Form2 f=new Form2();
        f.ShowDialog();
    }

    protected override void WndProc(ref Message m) {
        count++;
        if (count<5) log("Thread ID="+Thread.CurrentThread.ManagedThreadId);
        base.WndProc(ref m);
    }
}

- add basically the same code to Form2 (without new Form2/ShowDialog)
- run, click button, see all thread IDs, on second form, click button, see all thread IDs equal to the former ones.

Smile | :)

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Xmen Real 22-Aug-09 3:15

22-Aug-09 3:15

I want to create a pemanent connection with windows application and webserver(sending/receiving bytes anytime). Like as I run application in my pc then it should connect to my webserver and keep connect untill application closes. I thought to use HttpWebRequest/Response but I didn't find it accurate way. Thought about Socket but it confuses about webserver. So before I try to implement anything I would like to know any better idea or any suggestion you guys like

thanks

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Natural_Demon22-Aug-09 6:30

22-Aug-09 6:30

i'm no profesional, but a webserver isn't designed to keep the connection.

you make a request, the webserver serves the requested data and that's it.

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Xmen Real 22-Aug-09 7:04

22-Aug-09 7:04

then how does messengers work ? like Yahoo Messenger or Windows Live

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Dave Kreskowiak22-Aug-09 7:38

Dave Kreskowiak

22-Aug-09 7:38

They're not using HTTP for the communication.

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Xmen Real 22-Aug-09 7:40