Managed C++/CLI

30-Sep-09 22:56

maybe the question was to general...i make a link where you can download my sample file with the problem. Th warnings are only because of my lib was for 'release' only. Hope someone can help me.

link

ps you need to correct the path of the linker to where you have the project to get the lib

ps2 maybe you need mysql do be installed on your pc with developer option to use because it use a mysql dll to run
or you have to put this dll in the project folder and you'll get it--download--

modified on Thursday, October 1, 2009 8:24 AM

Richard MacCutchan30-Sep-09 23:40

30-Sep-09 23:40

carlo.andreoli wrote:
you can download my sample file with the problem

This looks like a fairly sizeable project, the zip file is nearly 5Mb. I think you are going to have to do some more work in narrowing down exactly where the error is occurring, at least to the line of code in your source.

carlo.andreoli30-Sep-09 23:59

30-Sep-09 23:59

ok if you open the program you'll see the real program are something like 100 line of real code. the size is beacuse i include all the vc++ project including the 2 lib that's like ~10MB of code...but the lib already work. The problem is that i compile it and everything goes right. When i run it gives me the error, the problem is in including the unmanaged class and trying to use it. It give me the error before i could initialize the first unmanaged class. Pls give it a try it's only 100 lines of code

Richard MacCutchan1-Oct-09 0:56

1-Oct-09 0:56

carlo.andreoli wrote:
Pls give it a try it's only 100 lines of code

Well I guess it's not too big a task for you then. You have all the same tools that I have to debug this; also you understand your code, I don't.

Richard MacCutchan1-Oct-09 1:38

Re: using unmanaged lib in managed class [modified]

1-Oct-09 1:38

I have taken a look at your project, and in the button click event I see

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
	try {
		db::database db2;
	 }
	 catch (System::Exception ^exception) {
			
	 }

This does not agree with your original description. I also found that the project will not link under VC++ Express Edition, as the library appears to have been built with VS 2008, which I do not possess.

carlo.andreoli1-Oct-09 2:03

1-Oct-09 2:03

i'm currently working with visual studio 2008 express edition. Why the coode doesn't agree with my original description ?(maybe i used different variabiles name but that was just an example, i'm going to correct it). pls help me point out. Now i give you all the things i have done:

1) we want to develop an application that can speak with database
2) i am making the visual side of the project using visual studio 2008 express
3) my friend is developing the 'wrapper' to connect to mysql but it's developing not in vs2008 express edition
4) now i want to integrate his code with mine
5) i take his code and if i make a program (without using clr) it works fine
6) i take his code and put it on a form, using clr option to compile,it compiles well but then it crash giving me the error you see in the starter thread

any ideas...do i have to be more specific?

thx man i really want to understand where is the problem and you are trying to help me

ps you need to correct the path of the linker to where you have the project to get the lib

ps2 maybe you need mysql do be installed on your pc with developer option to use because it use a mysql dll to run
or --> you have to put this dll in the project folder and you'll get it--download--

modified on Thursday, October 1, 2009 8:24 AM

Richard MacCutchan1-Oct-09 2:29

1-Oct-09 2:29

carlo.andreoli wrote:
6) i take his code and put it on a form, using clr option to compile,it compiles well but then it crash giving me the error you see in the starter thread

Well, as I stated before, you have all the tools to track down where it is failing. Use the debugger, step through the program to the fail point and then look at the variables and stack trace to see what is going on. If the problem lies in your friend's library then get him to fix it.

carlo.andreoli1-Oct-09 3:34

1-Oct-09 3:34

i'll give it a try...but i'm new to c++ programming..i have only developed thing through application by now Smile | :)

so i have to skill a lot. Now i'll try to look at the stack frame to see if i can understand something

Richard MacCutchan1-Oct-09 5:21

1-Oct-09 5:21

carlo.andreoli wrote:
i'll give it a try...but i'm new to c++ programming

Maybe you should have started with a simpler project! Learning C++ is not the easiest task, even for programmers coming from C or Pascal background. You made it even harder by going for the managed C++/CLI form which adds a whole extra level of complexity. Buona fortuna!

cli::array<any^>^ Array

jashimu29-Sep-09 7:12

jashimu

29-Sep-09 7:12

Hello Everyone, I am struggling with a problem for two days and could not figure out what to do.

Here what I am trying to do.
I have cli<array> which is two dimentional. I get data in that array but is not in order. I want to copy that data in a temp array [same type] in order. I want change the location of the column and put it indore to the temp array.

example,original array A[0,0]
A[0,1]
A[0,2]
A[0,3]

I want to copy column in a different location of the new array
B[0,0]=A[0,2]
B[0,1]=A[0,3]
B[0,2]=A[0,0]
B[0,3]= A[0,0];

If anybody can please give me a hint would be very helpful.
if you did not understand the question please ask me I really need it soon.

Thanks in advance.

N a v a n e e t h29-Sep-09 17:58

29-Sep-09 17:58

What specific problem are you facing here?

Navaneeth

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jashimu30-Sep-09 4:32

jashimu

30-Sep-09 4:32

Hi Navaneeth, Sorry to answer you late but thanks for your kindness.

the question I have is I want to copy a two dimentional array but not just a carbon copy. I want to get what ever index I want and insert into a new array.
for example, array A has 10 index and I want to copy array A to Array B but not same order.array A's index 1,3,6,8 I want it to be array B's index 1,2,3,4.

how do I do this.

Sorry question may trivial but I need to know it since I am not a expert yet.

thanks

Jashim

Richard MacCutchan30-Sep-09 22:18

30-Sep-09 22:18

jashimu wrote:
I want to copy column in a different location of the new array
B[0,0]=A[0,2]
B[0,1]=A[0,3]
B[0,2]=A[0,0]
B[0,3]= A[0,0];

I think this is your only solution, since there appears to be no logical order to your input data.

problem extending datetimepicker

jashimu1-Oct-09 6:50

jashimu

1-Oct-09 6:50

I figure it out the same. I did manually everything.

thanks for your reply Richard.

jashim

carlo.andreoli27-Sep-09 21:50

27-Sep-09 21:50

googling around i found some extension to the default tiempicker to make backcolor suitable...what i have till now is:

namespace primoAlpha {

	using namespace System;
	using namespace System::Drawing;
	using namespace System::Windows::Forms;
	using namespace System::Security::Permissions;

	public ref class extendedDateTimePicker : DateTimePicker
	{
	private:		
		Color _BackColor;
	public:
		property Color BackColor  
		{
			virtual Color get() override {
				return _BackColor;
			}
			virtual void set(Color value) override	{
				_BackColor = value;
				Invalidate();
			}
		}

	protected:
		[SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
		virtual void WndProc( Message% m ) override
		{	
			if ( m.Msg == (int) 0x0014 ) {	//WM_ERASEBKGND
				
				Graphics ^g = Graphics::FromHdc(m.WParam);
				g->FillRectangle(gcnew SolidBrush(_BackColor),
				ClientRectangle);
				g->ReleaseHdc();
				//g->Dispose();
				return;
				
			}
			WndProc(m);
		}
	};

}

the code compile with no error but when i run it gives me an
"An unhandled exception of type 'System.StackOverflowException' occurred in primoAlpha.exe"

any help is really apprecieted, i'm a noob in c++

Luc Pattyn28-Sep-09 0:30

28-Sep-09 0:30

Hi,

IMO your WndProc is calling itself instead of the base WndProc method. I don't know the correct C++/CLI syntax for it though.

Smile | :)

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

carlo.andreoli28-Sep-09 1:52

28-Sep-09 1:52

the code from which i constrcuted the code tell to use

Form::WndProc(m);

but if try to use it it tell me "candidate function(s) not accessible"

cause Form::WndProc is a private code.

Luc Pattyn28-Sep-09 2:08

28-Sep-09 2:08

it works in C#:

public class extendedDateTimePicker : DateTimePicker {
    protected override void  WndProc(ref Message m) {
         base.WndProc(ref m);
    }
}

BTW: the message parameter takes a reference.

Smile | :)

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

N a v a n e e t h28-Sep-09 2:33

28-Sep-09 2:33

Luc Pattyn wrote:
the message parameter takes a reference.

Do you have any idea why it is passed as reference?

Navaneeth

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Luc Pattyn28-Sep-09 2:41

28-Sep-09 2:41

the message is a struct you may want to modify and pass on.

Smile | :)

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

N a v a n e e t h28-Sep-09 2:43

28-Sep-09 2:43

Ahh. That was simple. I was not aware that Message is a struct.

Thanks Thumbs Up | :thumbsup:

Navaneeth

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Luc Pattyn28-Sep-09 2:56

28-Sep-09 2:56

With the number of messages flying around in Windows, they'd better be structs.

Smile | :)

Luc Pattyn

Local announcement (Antwerp region): Lange Wapper? Neen!

N a v a n e e t h28-Sep-09 2:31

28-Sep-09 2:31

Correct syntax is BaseClassName::MethodName. So you write DateTimePicker::WndProc(m).

C++

public ref class extendedDateTimePicker : DateTimePicker
{
protected:
	[SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
	virtual void WndProc( Message% m ) override
	{	
		if ( m.Msg == (int) 0x0014 ) {	//WM_ERASEBKGND
                     // your code				
		}
		DateTimePicker::WndProc(m);
	}
};

Navaneeth

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carlo.andreoli28-Sep-09 3:12