Managed C++/CLI

5-Jul-08 6:20

Hello!

I want to compare the type of an object to a class.
What is the correct syntax to use? In my case, I
want to know if a control is an instance of MdiClient.
GetType works on the pointer, but not on the class.
typeid(MdiClient) gives me error C3767.

Alex

Mark Salsbery5-Jul-08 9:29

5-Jul-08 9:29

if (some_ref_handle->GetType() == MdiClient::typeid)
{
   //some_ref_handle references a MdiClient object!
}

LionAM5-Jul-08 9:47

5-Jul-08 9:47

Thank you!
At first I got an error because MdiClient is a private(?) member
of the class (which is not shown in the IntelliSense list).
But with
Windows::Forms::MdiClient::typeid
it works.

Alex

Mark Salsbery5-Jul-08 9:53

5-Jul-08 9:53

Cool

LionAM wrote:
MdiClient is a private(?) member
of the class

MdiClient IS the class.

LionAM wrote:
But with
Windows::Forms::MdiClient::typeid
it works.

Oops - I guess I assumed "using namespace Windows::Forms;"

typeid needs to know the type at compile time. You could also use something like

if (some_ref_handle->GetType() == Type::GetType("Windows::Forms::MdiClient"))

for a runtime check.

Cheers,
Mark

LionAM5-Jul-08 12:00

5-Jul-08 12:00

Hello!

::MdiClient::typeid works, but MdiClient::typeid
gives

error C3223: 'System::Windows::Forms::Form::MdiClient' : you cannot apply 'typeid' to a property

Alex

Mark Salsbery5-Jul-08 12:43

5-Jul-08 12:43

MdiClient is in the System::Windows::Forms namespace, not the
System::Windows::Forms::Form namespace (which doesn't exist -
System::Windows::Forms::Form is a class).

Either of these should work:

using namespace System::Windows::Forms;
...
   if (objectref->GetType() == MdiClient::typeid)

if (objectref->GetType() == System::Windows::Forms::MdiClient::typeid)

Mark

UDP messages

dSolariuM5-Jul-08 3:26

dSolariuM

5-Jul-08 3:26

Hi all,
I have a server application that sends a udp message to clients,
But it receives the message as well,
And I don't want this....
I want only other clients Receive the message.
Please help me,
Thank you.

Every new thing you learn,Gives you a new personality.

Re: UDP messages

Mark Salsbery5-Jul-08 9:31

Debuging Interop: C# -> C++

5-Jul-08 9:31

dSolariuM wrote:
I have a server application that sends a udp message to clients

HoW?

Mark

Tomerland4-Jul-08 4:39

Tomerland

4-Jul-08 4:39

Dear experts,

I have the following problem.

I have "C++ - unmanaged code" and I want to use it in my managed C#-Applications. Therefore I have a "managed C++" - wrapper around my "unmanaged C++ - Code"

At the end I have the following "call-sequence"

"Managed C#" -> "Managed C++" -> "Unmanaged C++"

All works fine, but the problem beginns at debugging the unmanged C++-Code.
a) I cannot step-into the "unmanged C++-Code"
b) The unmanged objects are not expanded in the debugger

Does somebody have any advice?

Kind regards

Re: Debuging Interop: C# -> C++

Tomerland4-Jul-08 4:45

Tomerland

4-Jul-08 4:45

Ok,

I found the solution the "stop-into"-Problem by Myself: Just the the debugger-option to: "Enable unmanaged code debugging".

What remains is the second problem: The unmanaged objects are not expanded.

Kind regards

Re: Debuging Interop: C# -> C++

Tomerland4-Jul-08 4:55

Tomerland

4-Jul-08 4:55

Hallo,

I found another part of solution.

If I set for all 3 components the debugger-option to "mixed mode" than I can expand the "unmanged objects" in the "managed C++"-Wrapper Smile | :)

)))

But I still cannot expand my "unmanaged C++"-objects in my "manged C#"-Code.

I fear, this is not possible due to totally different languages

Kind regards

To Get Decimal separator

mikobi4-Jul-08 3:50

Re: To Get Decimal separator

4-Jul-08 3:50

How can I get Decimal separator in the system that my program run
I use Visual c++ NET

LionAM5-Jul-08 6:34

Re: To Get Decimal separator

5-Jul-08 6:34

Hello!
Have a look at:

System::Globalization::CultureInfo::CurrentCulture->NumberFormat->NumberDecimalSeparator

Alex

mikobi6-Jul-08 23:08

6-Jul-08 23:08

Thanks a lot

TextBox Format

mikobi3-Jul-08 21:59

Is there anyone use C++/CLI in the real project?

3-Jul-08 21:59

Dear All,

I have a telephone field on my form for example, it can be Account number, how can I format my text1 field so that what I Capture be what I need.

Tal Rasha's Guardianship3-Jul-08 7:26

Tal Rasha's Guardianship

3-Jul-08 7:26

I have a project written in C++,and I want to use the .NET framework as the architecture in the next version. Rewrite all the code in C# is impossible, so I give my attention to C++/CLI.

I have less understanding about this tech, I only know these points about it:

1.The original C++ code can be compiled in the C++/CLI compiler
2.I can use all of the C++ function in the new platform
3.I can use all of the .NET framework function in my C++ code
4.For deploy issue, I will only need to install the .NET framework will my application, then everything could be OK

Are there any other things need to be noticed?

Re: Is there anyone use C++/CLI in the real project?

Mark Salsbery3-Jul-08 7:39

Re: Is there anyone use C++/CLI in the real project?

3-Jul-08 7:39

Tal Rasha's Guardianship wrote:
4.For deploy issue, I will only need to install the .NET framework will my application, then everything could be OK

You may need to deploy additional things used by your C++ code, like MFC and/or the CRT libraries.

You should also understand interop between native and managed code, if it applies.

Visual C++ .NET Programming Guide[^]

Mark

Tal Rasha's Guardianship3-Jul-08 19:04

Tal Rasha's Guardianship

3-Jul-08 19:04

Thanks for your reply.

I cared about if C++/CLI can be used in a large C++ project, are there any troubles may happen?

Re: Is there anyone use C++/CLI in the real project?

Mark Salsbery4-Jul-08 11:17

Why is BinaryWriter() is inserting unwanted bytes?

4-Jul-08 11:17

C++/CLI is great for making the transition from native C++ to the managed .NET
world - that's it's intended purpose. If you have C++ code and you want to use
the .NET framework then it's great.

Eventually you'll notice that the development tools using C# are much better, but
C++/CLI let's you use your existing C++ code as you make the transition.

I use C++/CLI extensively, along with native C++ and C#. There's no troubles that are any
different than using any other .NET language. Having the rich .NET framework available to
existing C++ code is great.

It's worth taking the time to study and understand the fundamentals of managed programming.
Especially important is performance-critical applications if you're making a lot of transitions
between managed and unmanaged code.

C++: The Most Powerful Language for .NET Framework Programming[^]
CLR Development (How Do I in Visual C++)[^]

Mark

BuckBrown2-Jul-08 6:41

BuckBrown

2-Jul-08 6:41

Hi, I'm using Visual Studio 2005 C++/CLI. I have a requirement that needs to write some ASCII to a file followed by binary data. I set up a BinaryWriter(FileStream) and everything is okay except that there is a byte preceding the String^ variables denoting the number of characters to follow. I do not want these "extra" bytes in the file. Is there a way to surpress these bytes from being written to the file?

Thanks,
Buck

Re: Why is BinaryWriter() is inserting unwanted bytes?

Mark Salsbery2-Jul-08 7:31

Visual c++ NET Application Probleme

2-Jul-08 7:31

You need to write the String chars yourself.

BinaryWriter has a Write() method that writes a Char.

for (int i = 0; i < str->Length; i++)
   writer->Write(str[i]);

Of course, you won't be able to read the data back in as a String
without some way of indicating where strings end in the file.

Mark

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

mikobi2-Jul-08 2:32