Managed C++/CLI

Re: How to copy/convert System::Object^(unsigned char) to local variable

20-Apr-09 8:31

Obviously, four people would have been the most efficient team size for this project - one person per byte Smile | :)

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

Luc Pattyn20-Apr-09 8:40

Luc Pattyn

20-Apr-09 8:40

If they all spend their time reading The Mythical Man-Month four people may not even be enough...

PS: have been reading some Joel-on-Software lately, so I couldn't join in, sorry.

Smile | :)

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Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

Re: How to copy/convert System::Object^(unsigned char) to local variable

Mark Salsbery19-Apr-09 6:40

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 6:40

marcusab wrote:
I would like to copy the data content of pDataByte to QByte

Here's two ways:

array<Byte> ^pDataByte = gcnew array<Byte>(4);
pDataByte[0] = 0x41;
pDataByte[1] = 0x42;
pDataByte[2] = 0x43;
pDataByte[3] = 0x44;

unsigned char QByte[4];

// Use a pinning pointer
pin_ptr<Byte> p = &pDataByte[0];
memcpy(QByte, p, 4);

// Use Marsal.Copy()
Marshal::Copy(pDataByte, 0, IntPtr(QByte), 4);

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

marcusab19-Apr-09 10:55

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 10:55

Thank you very very very much , you got me going in the right direction, see my answer to Navaneeth for more info.

Almost, pDataByte is a System::Object^ {System.Array}, not an array<unsigned char=""> {Length = 0x4} as with QByte. See debug info:

Name         Value           Type
pDataByte    {System.Array}  System::Object^
 [0x0]       0x41 ‘A’        unsigned char
 [0x1]       0x42 ‘B’        unsigned char
 [0x2]       0x43 ‘C’        unsigned char
 [0x3]       0x44 ‘D’        unsigned char
QByte        {Length=0x4}    unsigned char[]
 [0x0]       0x00 ‘’         unsigned char
 [0x1]       0x00 ‘’         unsigned char
 [0x2]       0x00 ‘’         unsigned char
 [0x3]       0x00 ‘’         unsigned char

So I get compilation error:

<br />
error C2665: 'System::Runtime::InteropServices::Marshal::Copy' : none of the 16 overloads could convert all the argument types<br />

Mark Salsbery19-Apr-09 11:12

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 11:12

marcusab wrote:
pDataByte is a System::Object^ {System.Array}, not an array

An array IS a System.Array, but I missed your declaration - sorry about that!

You need the cast Smile | :)

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

marcusab19-Apr-09 11:32

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 11:32

By the way, how do I create the variable pDataByte (now I recevie it from an external DLL).

I would like to do someting like this:

System::Object ^pDataByte = gcnew System::Object(System::Array<<System::Byte>>(4));

To get this:

Name         Value           Type
pDataByte    {System.Array}  System::Object^
 [0x0]       0x00 ‘’         unsigned char
 [0x1]       0x00 ‘’         unsigned char
 [0x2]       0x00 '’         unsigned char
 [0x3]       0x00 ‘’         unsigned char

marcusab19-Apr-09 11:44

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 11:44

Never mind ... D'Oh! | :doh:

System::Object ^pDataByte = gcnew array<System::Byte>(4);

Again, thank you very much Smile | :)

Mark Salsbery19-Apr-09 11:44

Re: How to copy/convert System::Object^(unsigned char) to local variable

19-Apr-09 11:44

Why not use the strong type instead of a System::Object^ ?

array<Byte> ^pDataByte = gcnew array<Byte>(4);

If you must use System::Object^...

System::Object ^pDataByte = gcnew array<Byte>(4);

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

marcusab19-Apr-09 11:57

19-Apr-09 11:57

Thanks again, you are the man Smile | :)

DialogBox in C++/CLI

J_E_D_I9-Apr-09 11:29

J_E_D_I

9-Apr-09 11:29

Hi, I can't find any decent example on how to create a DialogBox using C++/CLI and on how to deal with the different responses triggered by the diffent buttons being pressed.

I've created graphically the DialogBox (form2) which has 2 buttons "A" and "B" but I can't understand how I can pass different values to the main form (form1) when each button is selected. Is it possible to do it without creating a new class. How?

Any example code would be highly appreciated.

Re: DialogBox in C++/CLI

Mark Salsbery9-Apr-09 12:26

9-Apr-09 12:26

J_E_D_I wrote:
I can't understand how I can pass different values to the main form (form1) when each button is selected.

You can add public properties and/or methods to the form1 class that can be used
like any other class properties/methods.

You could also use events if a publisher/subscriber scenario is more appropriate.

This is basic C++ and not particular to the UI...

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

Re: DialogBox in C++/CLI

led mike10-Apr-09 4:37

CLR Linking takes long time

10-Apr-09 4:37

J_E_D_I wrote:
but I can't understand how I can pass different values to the main form (form1) when each button is selected.

As Mark points out, these forms are classes so the same thing applies to them as any class. That said from a Design, Principles and Best Practices perspective, it is not advisable to have cohesion between UI views. See the Design Pattern Model View Controller[^].

Re: DialogBox in C++/CLI

Luc 64801110-Apr-09 7:00

Luc 648011

10-Apr-09 7:00

Set some Button.DialogResult value for those buttons that should close the dialog and return something.

Smile | :)

KASR19-Apr-09 0:50

KASR1

9-Apr-09 0:50

Recently i have converted my project to support Common Language Runtime Support (/clr).
After this i notice linking takes long time.
Can we reduce this speed issue?

Rolf Kristensen9-Apr-09 3:22

Rolf Kristensen

9-Apr-09 3:22

I'm very interested in hearing about any solutions you might find. I have a very large MFC application where I want to use .NET WPF.

I have been told that one should not enable the CLR switch for an entire project, but only for the source files that need to interact with .NET code.

Also did the linker time become slow by just enabling the CLR switch, or are you comparing linker times in VC6 with VS2005/VS2008 ?

KASR19-Apr-09 3:26

KASR1

9-Apr-09 3:26

No. After CLR conversion only i takes long time to link.

teejayem9-Apr-09 5:34

teejayem

9-Apr-09 5:34

You could use #pragma unamanged[^] at the top of your unamanaged source files.

Don't be overcome by evil, but overcome evil with good

led mike9-Apr-09 8:31

9-Apr-09 8:31

Yes. Isn't always such a shock at what useful things one finds in the documentation. It's almost like it would be a good idea to constantly be using it. Laugh | :laugh:

a managed array cannot have this element type

Luc 64801110-Apr-09 7:02

Luc 648011

10-Apr-09 7:02

They should have called it #pragma fast_linking then. Big Grin | :-D

Member 20210228-Apr-09 4:44

Member 2021022

8-Apr-09 4:44

I'm porting a WindowsControlLibrary solution from DotNet2003 to 2005 and I get the following error

Error 1 error C2691: 'Mcs600CTL::Mcs600CTLControl::flotArray' : a managed array cannot have this element type c:\work\net2005\mcs600ctl\Mcs600CTLControl.h 148

this use to compile on 2003 without any problems

typedef float flotArray __gc[];
public: __event void Mcs600_Raw_Spektra_Ready( flotArray mySpektra); line 148

I also get this error

Error 2 error C2664: 'Mcs600CTL::Mcs600CTLControl::raise_Mcs600_Raw_Spektra_Ready' : cannot convert parameter 1 from 'float __gc[]' to 'Mcs600CTL::Mcs600CTLControl::flotArray __gc[]' c:\work\net2005\mcs600ctl\Mcs600CTLControl.h 1002

__raise Mcs600_Raw_Spektra_Ready(sampleSpectrum); Line 1002

regards,
-dan

What is your damage?

led mike8-Apr-09 5:21

8-Apr-09 5:21

You already have a thread for this question here[^]

Why are you starting new ones when you have not even replied to the people that were helping you in the first thread. That is not really how this site rolls, I suggest you get your act together if you want people from this site to help you.

Mark Salsbery8-Apr-09 7:14

8-Apr-09 7:14

Wow dude - that thread you linked to is so old I can't even view the responses.

How did you find that? Laugh | :laugh:

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

Luc Pattyn8-Apr-09 7:35

Luc Pattyn

8-Apr-09 7:35

Easily[^]

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led mike9-Apr-09 8:33

9-Apr-09 8:33

He was joking. He was the guy replying to the thread. Wink | ;)