Managed C++/CLI

Value classes and structs

21-Dec-06 5:46

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led mike

kristmun20-Dec-06 22:47

kristmun

20-Dec-06 22:47

Hi guys,
I was just wondering if it is possible to assign a value class direct to a unmanaged structure without
assigning individual variables and vice versa?

/krissi

Re: Value classes and structs

led mike21-Dec-06 5:50

Converting a IntPtr to HWND ?

21-Dec-06 5:50

kristmun wrote:
if it is possible to assign a value class direct to a unmanaged structure without
assigning individual variables and vice versa?

Yes System.Runtime.Interop.Marshal class has those methods.

led mike

Fritzables20-Dec-06 18:08

Fritzables

20-Dec-06 18:08

Ok, on previous posts you may have noticed that I have been playing around with processes and the like.

I have created a Console application that fires up NOTEPAD and access the menus but I need to ensure that it remains as the ForegroundWindow.

To do this I need to acquire the Handle of the process that I started then apply it to the ForegroundWindow property - this is where I am having trouble.

The following is how I start NOTEPAD then return it's MainWindowHandle which is a IntPtr:

<br />
IntPtr Hnd;<br />
<br />
Process^ Proc = gcnew Process;<br />
Proc->StartInfo->FileName = "NOTEPAD.EXE";<br />
Proc->Start();<br />
Proc->WaitForInputIdle();<br />
Hnd = Proc->MainWindowHandle;<br />

Now when I include the following line:
SetForegroundWindow(Hnd);

I get the following error when compiling:

<br />
error C2664: 'SetForegroundWindow' : cannot convert parameter 1 from 'System::IntPtr' to 'HWND'

Can I conver a IntPtr to a HWND ?

Pete

Re: Converting a IntPtr to HWND ?

User 58385220-Dec-06 19:38

User 583852

20-Dec-06 19:38

G'Day Pete

Give this a go

::SetForegroundWindow((HWND)(Hnd.ToPointer()));

System.IO.Path.IsPathRooted() does not behave as I would expect

Re: Converting a IntPtr to HWND ?

Fritzables21-Dec-06 11:41

Fritzables

21-Dec-06 11:41

G'Day Josh,

Yep.... look'n good.

Thanks again and have a great Xmas.

Pete

Passing Reference to Thread Delegate

ricecake20-Dec-06 9:54

ricecake

20-Dec-06 9:54

I am using Managed C++ (VS .NET 2003 SP1), so I can't use any of the new features in C++/CLI (VS 2005).

I have a function that needs to take in a const reference to a native class, e.g.,

void MyManagedClass::f(const UnmanagedClass& u);

If I just call it straight, like (inside another member function of MyManagedClass):

UnmanagedClass u;
f(u);

then it works OK. However, I would like to call this function in another thread. I have something like this, but it doesn't work:

__delegate System::Void ThreadDelegate(const UnmanagedClass&);
// ...
UnmanagedClass u;
ThreadDelegate* td = new ThreadDelegate*(this, f);
Object* args[] = new Object*[1];
args[0] = &u;
Invoke(td, args);

The problem is passing the parameter to the delegate. I would rather not have to write a managed wrapper for my unmanaged class if it can easily be avoided. Is there any way to do what I want? I have tried putting in __nogc in various parts of the array declaration but I can't get it to compile.

--
Marcus Kwok

Dispatching based on Names

ComplexLifeForm19-Dec-06 22:33

ComplexLifeForm

19-Dec-06 22:33

Hi All,

I have a design question and I am looking for a best way to implement it.
Say I have a method which returns a string e.g.

string str = MyMethod();

MyMethod returns a string from one of the predefined strings. Based on the return value I need to execute certain sequence of methods. I do not want to implement it using an ugly if-else statements, so what is my best bet to implement it. I am looking for something like auto dispatching based on return values. Also the number of predefined strings can go up in future, so I do not really want to touch the code everytime a new string is added.

I have thought of associative array's based solution. The array will store the string to method mapping and based on the return value the correct method will be invoked. But I am not sure if this is an elegant solution.

Can someone please guide me on how to go about for an elegant solution.

Thanks and Regards.

Re: Dispatching based on Names

bsaksida19-Dec-06 23:16

Re: Dispatching based on Names

19-Dec-06 23:16

switch (str)
{
case "test1"
break;
default:
break;
}

ComplexLifeForm20-Dec-06 1:15

ComplexLifeForm

20-Dec-06 1:15

Hi Bsaksida,

You cannot use strings in case statement, even if you could, you will still need to modify the code if new strings are added. What I am looking for is an independed dispatch engine.

Thanks.

Re: Dispatching based on Names

led mike20-Dec-06 5:46

Reading & Writing Config Files

20-Dec-06 5:46

It sounds like you are asking about a "plug-in" implementation.

psychedelic_fur wrote:
the correct method will be invoked.

Well that approach would be similar to the old C function pointer technique. OO concepts introduced "interfaces" which are preferable from a design standpoint. It is also referred to as Design by Contract[^]

Anyway a simplified version of this for a "plug in" implementation could go like this:

Design one or more interfaces (see Design by Contract). Each plug-in (class) will implement one or more of these interfaces. Along with the interfaces you design a "configuration" scheme for giving the application the required information about new classes that have been installed. Then you can leverage the System.Reflection classes to dynamically instantiate an object from it's text name (basically). Using this approach you can add new classes to an application by installing a new assembly and adding the requisite information to the applications configuration file.

led mike

mactick19-Dec-06 21:36

mactick

19-Dec-06 21:36

Hi, i would like to know how to go about reading and writing config files in C++/CLI.

After clicking on 'open' in the menustrip, i would like to open a config file, and after editing its contents, i would like to know how to save it. Smile | :)

bsaksida19-Dec-06 23:21

19-Dec-06 23:21

http://users.volja.net/bsaksida/alt.zip[^]

Whis is my finished project, and was newer published. You can use it to translate lng files. (Design for ArtMoney) You can use it as you see fit.

point of Intrest:
Public: OpenLNG(..) //In this function it opens a file.
public: SaveTranslation(..) //in this function it saves a file

ps: This project was compiled under VS2003

mactick20-Dec-06 0:22

mactick

20-Dec-06 0:22

do you know of the method in .NET 2005 that can help me work on config files?
in the config files, i need to pass string through..
basically, i need to write and read config files to store values in string.

PS:i dont know how to use your codes as i dont understand them, thanks for attaching them. (:

bsaksida20-Dec-06 0:29

20-Dec-06 0:29

Diffrence with VS2005 and VS2003 is only syntax. But callining a function or property is same order.

1. When you says config file. Did you first think how it will look it:

examples 1:
1="this var"

example 2:
options "variable"

example 3:
Font:Arial

When you have your basic syntax for config file, then you have to write reader code, witch will split into VariableName and VariableItself

Re: Reading &amp; Writing Config Files

mactick20-Dec-06 0:34

mactick

20-Dec-06 0:34

let say for example, if i want to write a config file to store string, how do i go abt doing that? and how do i read config files after writing them?

im totally new to config files and C++, and i need guidance in understanding them, bear with me pls.

bsaksida20-Dec-06 1:24

20-Dec-06 1:24

String ^file = gcnew String ("c:\\config.txt"); 
FileStream ^fs = gcnew FileStream(file, FileMode::OpenOrCreate, FileAccess::Write);
StreamWriter ^sw = gcnew StreamWriter(fs);

sw->WriteLine("Line1");
sw->WriteLine("Line2");
sw->WriteLine("Line3");
sw->WriteLine();
sw->WriteLine("Line5");

sw->Close();
fs->Close();

fs = gcnew FileStream(file, FileMode::Open, FileAccess::Read);
StreamReader ^sr = gcnew StreamReader(fs);

while (!sr->EndOfStream)
{
	MessageBox::Show(sr->ReadLine());
}
sr->Close();
fs->Close();

led mike20-Dec-06 5:33

Can a class object in Dialog based application serialized?

20-Dec-06 5:33

mactick wrote:
i would like to know how to go about reading and writing config files in C++/CLI.

They hide that information in the documentation[^]

led mike

Hi!!!

alijon19-Dec-06 19:39

alijon

19-Dec-06 19:39

ok i am beginner in c programming language can you help with c i have assignment but i cant do it
if you want help me please email me :alisher2005@hotmail.com

Re: Hi!!!

kristmun19-Dec-06 21:07

kristmun

19-Dec-06 21:07

I think you should begin with finding out how message boards work.
First thing is to find the right message board, in this case you are in the wrong one.
This message board is only for C++/cli.
Second thing is that you never ever ask someone to do your homework.
With this said I think you should google a c tutorial or buy a book.
Good luck.

Re: Hi!!!

Mark Salsbery20-Dec-06 13:41

Mark Salsbery

20-Dec-06 13:41

Hi!!!

Sunil Jampa19-Dec-06 16:54

Sunil Jampa

19-Dec-06 16:54

Can I serialize a class object in Dialog based application, if yes, can anybody let me know how to do that one. If not, then how to do it in an alternate way?

Thanks in advance,

Sunil Jampa.

Re: Can a class object in Dialog based application serialized?

prasad_som19-Dec-06 21:44

prasad_som

19-Dec-06 21:44

This is wrong forum for this question. Use VC++ fourm instead.
And have look at this[^] before asking doubts.

Prasad
Notifier using ATL | Operator new[],delete[][^]

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bsaksida19-Dec-06 11:23