Managed C++/CLI

27-Feb-08 5:16

readwrite wrote:
I need some code samples to add & find a node using visual c++.Send me the same.

I see you are new to CodeProject, welcome. Beer | [beer]

As to your request you should read the first post in the Visual C++ / MFC forum titled "How to get an answer to your question". Pay attention to item #2. Also this Posting Guidelines Article[^] might be helpful as well.

led mike

model dialog box

rose19626-Feb-08 22:40

rose196

26-Feb-08 22:40

Hi,

I am trying to create a model dialog box "in managed c++".
I don't know the basic steps.
Can you give the steps,and tell how to add this to form.
I read the msdn already. I couldn't understand.
Helpme.

Thanks,

rose

Re: model dialog box

led mike27-Feb-08 5:03

27-Feb-08 5:03

rose196 wrote:
Can you give the steps,and tell how to add this to form.
I read the msdn already. I couldn't understand.

"The following code example creates a new instance of a Form and calls the ShowDialog method to display the form as a dialog box."

They hide those samples in the documentation[^]

led mike

Re: model dialog box

rose19627-Feb-08 5:25

rose196

27-Feb-08 5:25

Hi,

Thanks for replaying.

I did already,as per the example,but i have a problem.

Actually i am developing IDE.
when i was pressing the new button the dialogbox has to be open.

My problem is when i press ok button in the dialodbox it perform some operation at the same time it has to be close know,but in my project it is not closed but it perform the needed operation. if i give close to close the dialogbox, the entire form was closed.

Now what i have to do.

Thanks

Searching Files..

ptr2void26-Feb-08 18:00

26-Feb-08 18:00

I am searching for files in a particular drive..
However, the search is very slow..
Can I use threads to accomplish this??
Can anybody tell me how to do this or send me a helpful link??

Re: Searching Files..

led mike27-Feb-08 5:00

27-Feb-08 5:00

ptr2void wrote:
However, the search is very slow..
Can I use threads to accomplish this??

So are you assuming that using threads will speed up the process?

led mike

Re: Searching Files..

ptr2void27-Feb-08 17:48

27-Feb-08 17:48

Yes I am assuming that threqads would make it faster..
Am I wrong? Please correct me..
Since I am using recursion, If I can spawn a thread whenever a new directory is found I am assuming that the search would be faster..
Please correct me if I am wrong and it would be very helpful if you could guide me in some way as to how the search could be faster..

Re: Searching Files..

led mike28-Feb-08 5:40

using office Word 2003/2007

28-Feb-08 5:40

ptr2void wrote:
Yes I am assuming that threqads would make it faster..
Am I wrong?

No you are not wrong, um Yes you are wrong. See it's just not that simple, threading never is and anyone who tells you different either doesn't know that they are talking about or is an absolute genius and therefore their experience does not apply to you and me.

Creating threads and switching context between them takes resources and processing cycles so technically can "slow down" a procedure. If the execution context ( hardware, running software ) provides a scenario where multiple processors are available and therefore can more efficiently execute your procedure then yes it could be faster (emphasis on "could" because multiple processors are not the only criteria in your case since there is still only one bus and one drive that you are accessing and therefore caching will come into play as well), otherwise it will just be slower. Now how do you determine if the execution context is favorable? There almost is no way. Also even when it is favorable, how much faster would it be? Don't know but in your case likely negligible.

This is really far more complex than I am qualified to explain but have I provided even a small explanation that helps?

led mike

javad_200526-Feb-08 6:22

Re: using office Word 2003/2007

26-Feb-08 6:22

Hi How To using office Word 2003/2007 in Manage C++

Paul Conrad29-Feb-08 8:04

Paul Conrad

29-Feb-08 8:04

Office Interop Library. Google for it and there is a lot on it...

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

First contact with C++/CLI

Luca Leonardo Scorcia25-Feb-08 23:35

Luca Leonardo Scorcia

25-Feb-08 23:35

Background: I'm trying to build a managed wrapper around a C library, using C++/CLI to build a DLL that will be referenced by a C# program. This is my first look to C++/CLI, so even little things seem really hard.

Now, my first problem. The C library has lots of parameters passed by pointers, e.g.:

void H5get_libversion(int * major, int * minor, int * release);

What I'd like to have is an equivalent method in C++/CLI, something that in C# would be:

void GetLibVersion(ref int major, ref int minor, ref int release);

The only way I found to achieve this is doing something like:

void HGlobals::GetLibVersion(unsigned int % major, unsigned int % minor, unsigned int % release)
{
	unsigned int _major, _minor, _release;

	H5get_libversion(&_major, &_minor, &_release);

	major = _major;
	minor = _minor;
	release = _release;
}

Do I really have to do this manual "duplication"? Isn't there a better (shorter) way?

Thanks in advance

Luca

The Price of Freedom is Eternal Vigilance. -- Wing Commander IV

En Það Besta Sem Guð Hefur Skapað, Er Nýr Dagur.
(But the best thing God has created, is a New Day.)
-- Sigur Ròs - Viðrar vel til loftárása

Re: First contact with C++/CLI

Mark Salsbery26-Feb-08 8:44

Mark Salsbery

26-Feb-08 8:44

Maybe try pinning those moveable managed "pointers" (tracking references)

void NativeFunc(int *a, int *b)
{
    *a = 10;
    *b = 20;
}

public ref class TestRefClass
{
public:
    TestRefClass()  {}
    void TestMethod(Int32 %a, Int32 %b)
    {
        pin_ptr<Int32> pa = &a;
        pin_ptr<Int32> pb = &b;
        NativeFunc(pa, pb);
    }
};


int _tmain()
{
    int a = 3;
    int b = 4;
    TestRefClass obj;
    obj.TestMethod(a, b);

    return 0;
}

Mark

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

Listbox Problem..

ptr2void25-Feb-08 22:28

25-Feb-08 22:28

Hi..
I am new to C++/CLI Programming..

I am using a user defined listbox and I am adding the items to it another method..

So the listbox dosent get dynamically painted..
I want to know is there any OnPaint() method for this??

Also do I have to make this listbox as DrawMode::OwnerDrawFixed ??

Kindly help..

Re: Listbox Problem..

Christian Graus25-Feb-08 22:30

Christian Graus

25-Feb-08 22:30

The listbox will have a draw event that gets called to draw an item if they are owner drawn

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Listbox Problem..

ptr2void25-Feb-08 22:43

25-Feb-08 22:43

Christian Graus wrote:
The listbox will have a draw event that gets called to draw an item if they are owner drawn

Here is some code:
void SearchFiles::SearchFileByPath(LPCTSTR path, LPCTSTR filename, System::Windows::Forms::ListBox ^ objListBox)
{
//performing some logic

objListBox->Items->Add(System::String(path).ToString());/*here adding items*/
//here want to draw it by: objListBox->DrawItem();
/*what to add in System::Object^ sender , DrawItemEventArgs^ e ?*/
}

Re: Listbox Problem..

ptr2void25-Feb-08 23:34

How to synchronize the system's configuration status between nodes?

25-Feb-08 23:34

Okay let me explain my problem:
I have a form1.h in which I am initializing the listbox as follows:

void InitializeComponent(void)
{
this->obj = (gcnew System::Windows::Forms::ListBox());

this->obj->Location = System::Drawing::Point(0, 0);
this->obj->Name = L"obj";
this->obj->Size = System::Drawing::Size(120, 95);
this->obj->TabIndex = 0;
}

Now I am calling another function to add some items as follows:

sf->SearchFileByPath(path,filename,obj,sender,e);

And in that particualr function , I want that the listbox items should dynamically be shown as the program runs..

So I tried adding the ListBox::DrawItems(sender,e) ..
But the error is like:

cannot convert parameter 5 from 'System::EventArgs ^' to 'System::Windows::Forms::DrawItemEventArgs ^'

System::Windows::Forms::DrawItemEventHandler ^System::Windows::Forms::ListBox::DrawItem': event does not have a raise method

Please help me..

Member 454227225-Feb-08 3:03

Member 4542272

25-Feb-08 3:03

I build a system and run it on few nodes concurrently. I want the configuration status of the system on those nodes be the same when one of the nodes change it. Let say 3 nodes A,B and c. When A change a system configuration to on, then the system configuration of other nodes will be synchronized to on immediately. My friend tell me a concept, build a simple database with excel store the configuration status from those node, latest status will overwrite the old status, then each nodes refer to it. Can somebody gv me some hints how to make it? On codeproject did anyone see any article bind with this concept? I don't know what keyword to search. Thx

Convert Struct

javad_200524-Feb-08 1:35

24-Feb-08 1:35

Hi how to Convert Struct To Byte

prasad_som24-Feb-08 3:22

prasad_som

24-Feb-08 3:22

What do you mean by convert ?

Prasad
MS MVP - VC++

javad_200524-Feb-08 5:36

24-Feb-08 5:36

Socket ^s;
s->Send(byte.........
I want to send struct

Mark Salsbery24-Feb-08 10:17

Mark Salsbery

24-Feb-08 10:17

The simplest method would be to create a Byte array the size of the structure and copy the structure bytes to the array.

    MyStruct mystruct;
    array<Byte>^ ByteArray = gcnew array<Byte>(sizeof(MyStruct));
    for (int i = 0; i < sizeof(MyStruct); i++)
        ByteArray[i] = ((unsigned char *)&mystruct)[i];
    Socket ^s;
    s->Send(ByteArray);

There's other problems which may or may not be a factor in your situation See here[^]

A more robust solution is to make classes/structs serializable so the conversion to/from a Byte array
is built in to the class.

Mark

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

javad_200525-Feb-08 2:14

25-Feb-08 2:14

Dont work
my struct is manage
ref Struct MyStruct
{
}
but sizeof dont work for manage Struct

Re: Visual c++ NET printing

Mark Salsbery25-Feb-08 5:50

Mark Salsbery

25-Feb-08 5:50

In that case you should probably use serialization.

Serializing Objects (.NET)[^]

You can use .NET serialization (like Binary Serialization[^]) or you could serialize
the struct yourself by writing whatever bytes make up the structure.

.NET serialization is robust and has the bonus of working with other .NET languages.

If the data is being sent to non-.NET apps then you'll need to write custom serialization.

Regardless of the method you use, you need a array of bytes - you can fill that array
however you want, as long as there's enough info there for the receiving end to reconstruct
the structure.

Mark

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

Visual c++ NET printing

mikobi22-Feb-08 0:00

mikobi

22-Feb-08 0:00

Dear Sir,
How do you print in Visual c++ NET 2005 ?

led mike22-Feb-08 6:59