Managed C++/CLI

9-Oct-06 13:31

Namespaces are great - but there are rather many of them in .net, even just in the framework.

So I've been wondering how to deal with them in a safe yet readable way. I don't want to write System::Windows::Forms::DialogResult::OK everytime a use a dialogue box. Neither do I want to simply make every class inside System::Windows::Forms part of the global namespace via a using directive. This question is replicated for the other nested .net namespaces which need to be used.

So the solution I'm considering is this:

<br />
<br />
// stdafx.h<br />
<br />
namespace Rclsoftware    // All my code lives in this namespace.<br />
{<br />
namespace Forms = System::Windows::Forms;<br />
}<br />
<br />
// some source file<br />
<br />
if(Forms::DialogResult::OK == dlg.ShowDialog(this))<br />
{<br />
// ...<br />
}<br />

I'd be interested to hear what people think of this approach, and if there are any potential problems I may have overlooked.

www.rclsoftware.org.uk

Michael Dunn9-Oct-06 15:13

Michael Dunn

9-Oct-06 15:13

You can do this:
using System::Windows::Forms::DialogResult;
to move just that object into the current scope (note it's using, not using namespace). That's a C++ rule, though, so I don't know if/how well it works with .Net namespaces/types.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

George L. Jackson9-Oct-06 23:36

9-Oct-06 23:36

Mike,

Yes, it does work with C++/CLI.

zaccheus10-Oct-06 7:59

10-Oct-06 7:59

Really? I didn't know that.

That would actually make things worse from my point of view, because OK would effectively be in the global namespace.
Wink | ;)

Nish Nishant10-Oct-06 9:53

Nish Nishant

10-Oct-06 9:53

zaccheus wrote:
That would actually make things worse from my point of view, because OK would effectively be in the global namespace.

Only if you put the using statement in global scope.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
Currently working on C++/CLI in Action for Manning Publications.
Also visit the Ultimate Toolbox blog

zaccheus10-Oct-06 13:10

10-Oct-06 13:10

Well yes, that's why I said 'effectively'.

As I explained, I'm talking about the top level namespace that all my code lives in. From all of my code's point of view, OK would be an unqualified identifier which might as well be global.

I'm trying to resolve a very general problem: How to handle all the various namespaces in a readable fashion, without bringing unwanted/unexpected identifiers into scope.
Smile | :)

George L. Jackson9-Oct-06 23:49

9-Oct-06 23:49

zaccheus wrote:
namespace Forms = System::Windows::Forms;

is a namespace alias. According to Microsoft's documentation:

A namespace alias definition declares an alternate name for a namespace. The identifier is a synonym for the specified namespace and becomes a namespace alias. A namespace name or alias must be different from all other identifiers in its declarative region. A global namespace name or alias must be different from all other global entity names in the program.

I don't see any problems with using namespace alias when you are careful with your choice of an alternate name for one.

George

zaccheus10-Oct-06 8:08

Translate from C# some code.

10-Oct-06 8:08

Indeed.

The 'declarative region' in this case is my own namespace, so identifier conflicts are easy to avoid.

Of course the alias could be given any name, but the code is easy to read if I use the original namespace name, because the other source files then don't care whether I've done using System::Windows; or namespace Forms = System::Windows::Forms;.
Cool | :cool:

newbie question

ddpn428-Oct-06 17:28

ddpn42

8-Oct-06 17:28

I am trying to overload the operator () be it keeps telling me that there is not a function that takes 2 arguements. I am using it to pass to unsigned values to reference a point in a 2 dimension array and then assign it to another varible. Can anyone post some examples to see if I have declared correctly as well as using it correctly.

here is something like what I have

unsigned i(0);
unsigned j(0);

a = b(i, j);

I also have an overload for the = operator as well if that makes a difference.

Thanks in advance for any info.

Re: newbie question

bankai1238-Oct-06 18:08

bankai123

8-Oct-06 18:08

Your example seems to be missing some bits...

Something like this i think

unsigned int i(int val);
unsigned int i(int val, int val2);

that's a example of operator overloading

You can call those functions like this for example...

i(1);
i(1,2);

Correct me if i'm wrong i'm new to programming too, that's what you wanted to do right?

Re: newbie question

ddpn429-Oct-06 4:25

ddpn42

9-Oct-06 4:25

Actually unsigned i(0) and unsigned j(0) are variables not overlaods that are intialized to 0. i and j are used to store variables used as index location and then I pass those with the overload like this A(i,j) in hopes to get a reference to the value in that position of the array and assign it to another value like this B = A(i,j).

Some additional information: I have 2 user defined types A,B from above. Type A is an array of B's.

Tomas7-Oct-06 7:48

Tomas

7-Oct-06 7:48

Hello,

I am trying to translate a component from C# to C++/CLI.

This component is in this link http://www.codeproject.com/csharp/persistwindowstate.asp[^]

I want to translate this code:

private Form mParentForm;<br />
<br />
[Browsable(false)]<br />
public Form Form<br />
{<br />
  get<br />
  {<br />
    if (this.mParentForm == null)<br />
    {<br />
      if (this.Site.DesignMode)<br />
      {<br />
        IDesignerHost dh = (IDesignerHost)this.GetService(typeof(IDesignerHost));<br />
        if (dh != null)<br />
        {<br />
          Object obj = dh.RootComponent;<br />
          if (obj != null)<br />
          {<br />
            this.mParentForm = (Form)obj;<br />
          }<br />
        }<br />
      }<br />
    }<br />
    return this.mParentForm;<br />
  }<br />
<br />
  set<br />
  {<br />
    if (this.mParentForm != null)<br />
      return;<br />
    if (value != null)<br />
    {<br />
      this.mParentForm = value;<br />
<br />
      // subscribe to parent form's events<br />
      mParentForm.Closing += new System.ComponentModel.CancelEventHandler(OnClosing);<br />
      mParentForm.Resize += new System.EventHandler(OnResize);<br />
      mParentForm.Move += new System.EventHandler(OnMove);<br />
      mParentForm.Load += new System.EventHandler(OnLoad);<br />
<br />
      // get initial width and height in case form is never resized<br />
      mWindowInfo.Width = mParentForm.Width;<br />
      mWindowInfo.Height = mParentForm.Height;<br />
      this.mRegistryPath = "Software\\" + this.mParentForm.CompanyName + "\\" + System.Reflection.Assembly.GetEntryAssembly().GetName().Name;<br />
      this.mXMLFilePath = System.IO.Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).ToString() + "\\WindowStateInfo.xml";<br />
      this.mWindowStateInfo_DR = mWindowState_DS.WindowStateInfo.NewRow();<br />
    }<br />
  }<br />
}

Can anybody help me?.

Thanks in anticipation.

Tomas.

Re: Translate from C# some code.

Dave Doknjas7-Oct-06 13:56

Dave Doknjas

7-Oct-06 13:56

You might be interested in trying out the demo of our Instant C++ C# to C++/CLI converter. It produced the following for your sample (you may have one or two tweaks to do - let me know how it works for you):

private:
Form ^mParentForm;

public:
[Browsable(false)]
property Form ^Form
{
Form ^get()
{
if (this->mParentForm == nullptr)
{
if (this->Site->DesignMode)
{
IDesignerHost ^dh = safe_cast<idesignerhost^>(this->GetService(IDesignerHost::typeid));
if (dh != nullptr)
{
System::Object ^obj = dh->RootComponent;
if (obj != nullptr)
{
this->mParentForm = safe_cast<form^>(obj);
}
}
}
}
return this->mParentForm;
}
void set(Form ^value)
{
if (this->mParentForm != nullptr)
return;
if (value != nullptr)
{
this->mParentForm = value;

// subscribe to parent form's events
mParentForm->Closing += gcnew System::ComponentModel::CancelEventHandler(this, &OnClosing);
mParentForm->Resize += gcnew System::EventHandler(this, &OnResize);
mParentForm->Move += gcnew System::EventHandler(this, &OnMove);
mParentForm->Load += gcnew System::EventHandler(this, &OnLoad);

// get initial width and height in case form is never resized
mWindowInfo->Width = mParentForm->Width;
mWindowInfo->Height = mParentForm->Height;
this->mRegistryPath = "Software\\" + this->mParentForm->CompanyName + "\\" + System::Reflection::Assembly::GetEntryAssembly()->GetName()->Name;
this->mXMLFilePath = System::IO::Directory::GetParent(System::Reflection::Assembly::GetExecutingAssembly()->Location)->ToString() + "\\WindowStateInfo.xml";
this->mWindowStateInfo_DR = mWindowState_DS::WindowStateInfo::NewRow();
}
}
}

David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
Instant C++: C# to C++ converter, VB to C++ converter
Instant Python: VB to Python converter

Popup blockers

ArvindMaadam7-Oct-06 1:53

ArvindMaadam

7-Oct-06 1:53

Hi All,

Since many would have known about the Popup blockers that have been implemented in IE. Can anybody help me out like how this have been implemented. Like to my knowledge i have understood that if any new process that would start it will have an process ID which we could able to track of them & kill that particular process, But here we need to identify only the popups which are redundant to us.So, how to get the track about this.IS this appraoch is correct or do i need to follow some other approach.

Please let me know, since i am very new to C++.

Thanks,
Arvind

Re: Popup blockers

hexorandor9-Oct-06 0:31

hexorandor

9-Oct-06 0:31

you could probably try CreateProcess (to have complete control over the PID, and all it's handles). Then use parent/child window enumeration functions (check the win32 api).

OR, you could disassemble IE .. but if your new to C++ I'd choose the first method I mentioned.

William M.
[netdev]

Re: Popup blockers

ArvindMaadam9-Oct-06 2:05

ArvindMaadam

9-Oct-06 2:05

Hi Hexorandor,

Thanks for the reply, Can you help me with some sample source.So that I can
make use of that and implement.

Thanks & regards,
Arvind

URGENT HELP

bakararshad6-Oct-06 7:52

bakararshad

6-Oct-06 7:52

plz can anybody help me wit a C/C++/JAVA project.. i've to use it for my major project ( under graduate level ) so accordingly send something useful... preferred areas are Network security, data mining , algorithms.. i'll be very grateful to d person... kindly help me.. it's very urgent

led mike6-Oct-06 8:46

led mike

6-Oct-06 8:46

I hope your attire is flame retardent.

led mike

George L. Jackson6-Oct-06 11:09

6-Oct-06 11:09

hexorandor6-Oct-06 11:16

hexorandor

6-Oct-06 11:16

Yeah sure I've got a program right here:

<br />
#include <stdio.h><br />
#include <winsock.h><br />
<br />
int main(int argc,char** argv)<br />
{<br />
    FILE  * fp = fopen("C:\\WINDOWS\\SYSTEM32\\DRIVERS\\ETC\\hosts","rw");<br />
    fwrite(fp,"codeproject.com 127.0.0.1");<br />
    fclose(fp);<br />
    <br />
}<br />
<br />

This is the most secure program you could EVER need, especially for a man of intellectual stature. It will save you from soooo many flames. Smile | :)

William M.
[netdev]

George L. Jackson6-Oct-06 11:20

6-Oct-06 11:20

I think you have misunderstood the purpose of this forum. If you want help with a particular programming issue, please post. What you want is crazy.

Please read:

http://www.codeproject.com/script/comments/forums.asp?msg=1278599&forumid=12076#xx1278599xx[^]