Re: How do I get Image_click to work more than once? - Managed C++/CLI Discussion Boards

Re: How do I get Image_click to work more than once?

Fenix27-Oct-09 1:42

7-Oct-09 1:42

The question is ultra simple.
How do I get a mouseclick event work twice?!?

As for the code, it works.

The bug is either the variable won't increment more than once, either the procedure is usable only once.

I'm gonna try something.

Re: How do I get Image_click to work more than once?

Richard MacCutchan7-Oct-09 4:17

Richard MacCutchan

7-Oct-09 4:17

Fenix2 wrote:
The question is ultra simple.

Maybe to you!

Fenix2 wrote:
As for the code, it works.

Obviously it doesn't, or you would not be asking this question.

Fenix2 wrote:
I'm gonna try something.

I would suggest you start with your if (Tsn11 = x) statements.

Re: How do I get Image_click to work more than once?

N a v a n e e t h7-Oct-09 5:06

N a v a n e e t h

7-Oct-09 5:06

Richard MacCutchan wrote:
I would suggest you start with your if (Tsn11 = x) statements.

Funny. I haven't noticed if (Tsn11 = x). Smile | :)

Navaneeth

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Re: How do I get Image_click to work more than once?

Richard MacCutchan7-Oct-09 6:57

Richard MacCutchan

7-Oct-09 6:57

N a v a n e e t h wrote:
Funny. I haven't noticed ...

Took me a few readings; I was looking at the wrong things!

Re: How do I get Image_click to work more than once?

Luc Pattyn7-Oct-09 8:34

Luc Pattyn

7-Oct-09 8:34

Hi,

in C/C++/Java/C# the equality operator is ==

Tsn11 = 1 is an expression which both sets Tsn11 to 1 and evaluates to 1, so your if statements will not act as you expect.

FWIW: in VB/VB.NET the equality operator is =

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

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

Re: How do I get Image_click to work more than once?

Fenix27-Oct-09 14:44

Fenix2

7-Oct-09 14:44

So where are you suggesting to put ==?

at the IF statement, or at the increment?

Re: How do I get Image_click to work more than once?

Luc Pattyn7-Oct-09 14:47

Luc Pattyn

7-Oct-09 14:47

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

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

Re: How do I get Image_click to work more than once?

Fenix27-Oct-09 15:28

Fenix2

7-Oct-09 15:28

It doesn't work.
If I guess,
I'd say myself that the error is in the starting of the form.h
What if the variables are always reset to 0?
What if the form, would be... in a repeatative process?
So where should I put the variable Tsn11 ?

Re: How do I get Image_click to work more than once?

Richard MacCutchan7-Oct-09 22:47

Richard MacCutchan

7-Oct-09 22:47

Fenix2 wrote:
It doesn't work.

What doesn't work?
You have statements of the form if (Tsn11 = 0), which, as Luc pointed out are incorrect. The equality operator in C++ is ==. Correct all your if statements and see what happens.

Re: How do I get Image_click to work more than once?

Fenix27-Oct-09 23:28

Fenix2

7-Oct-09 23:28

Yeah Thanks to all of you.
It works now.

Whats a natural successor to the COM object?

Ger Hayden6-Oct-09 11:12

Ger Hayden

6-Oct-09 11:12

Whats a natural successor to the COM object in the managed C++/CLI world?

I am migrating an app which has COM objects for no better reason that than is the only way I could get a form into a DLL to share between two exe's.

What should I be using in C++/CLI?

Ger

Re: Whats a natural successor to the COM object?

N a v a n e e t h6-Oct-09 17:21

N a v a n e e t h

6-Oct-09 17:21

Ger Hayden wrote:
What should I be using in C++/CLI?

It should be managed assemblies. You can pack windows forms in to assemblies(DLLs) which can be used with multiple applications. Create a Class Library project and add reference to System.Windows.Forms assembly.

Navaneeth

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Which method of connection to MySQL is Best?

Ger Hayden6-Oct-09 11:09

Ger Hayden

6-Oct-09 11:09

I am migrating to Managed C++/CLI and .NET.

Previously I have used mysql++ with some difficutly.

Should I stick with it or move to ODBC or Connector/.NET?

Ger

Re: Which method of connection to MySQL is Best?

N a v a n e e t h6-Oct-09 17:14

N a v a n e e t h

6-Oct-09 17:14

In .NET, MySql connector is the best. It follows ADO.NET standards and provide a neat interface. Download from here[^].

Navaneeth

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Re: Which method of connection to MySQL is Best?

Ger Hayden7-Oct-09 2:23

Ger Hayden

7-Oct-09 2:23

Thanks. A few minutes to down load. Working example in less than half an hour....

Ger

CLI,How to divide a class into multi-files(like c# partial)

akira324-Oct-09 18:08

akira32

4-Oct-09 18:08

How to divide a class into multi-files(like c# partial)?
I want to divide class MainForm into multi-files?
Could somebody tell me how do I achieve this goal?

namespace MyTools {
 using namespace System;
 using namespace System::ComponentModel;
 using namespace System::Collections;
 using namespace System::Windows::Forms;
 using namespace System::Data;
 using namespace System::Drawing;
 using namespace System::IO; 
 using namespace System::Globalization;//for NumberFormatInfo

 vector<MyData> m_MyData;

 public ref class MainForm : public System::Windows::Forms::Form
 {

Re: CLI,How to divide a class into multi-files(like c# partial)

N a v a n e e t h4-Oct-09 20:20

N a v a n e e t h

4-Oct-09 20:20

akira32 wrote:
How to divide a class into multi-files(like c# partial)?

C++ or C++/CLI already supports this. One header file and several source files is possible. You can have a MainFormUI.cpp which includes MainForm.h and have methods like InitializeComponent. Another source file say MainForm.cpp which has all other method implementations.

Unfortunately, VS designer won't support this kind of separation and it will always write the auto-generated code to MainForm.h.

Navaneeth

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Re: CLI,How to divide a class into multi-files(like c# partial)

George L. Jackson5-Oct-09 9:27

George L. Jackson

5-Oct-09 9:27

A C# Partial Class is not equivalent to the C++ & C++/CLI header/source model. The following cannot not be done with C++ or C++/CLI in different (or in the same) files:

// In source file X: 
public partial class Employee
{
    public void DoWork()
    {
    }
}

// In source file Y
public partial class Employee
{
    public void GoToLunch()
    {
    }
}

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: CLI,How to divide a class into multi-files(like c# partial)

N a v a n e e t h5-Oct-09 16:07

N a v a n e e t h

5-Oct-09 16:07

George L. Jackson wrote:
A C# Partial Class is not equivalent to the C++ & C++/CLI header/source model.

I never said they are equal.

George L. Jackson wrote:
The following cannot not be done with C++ or C++/CLI in different (or in the same) files:

Correct because it needs all the functions to be declared before using.

The question here is How to divide a class into multi-files(like c# partial)? and I believe C++'s header and multiple source files model is the answer. Please correct me if you feel it is wrong.

Smile | :)

Navaneeth

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Re: CLI,How to divide a class into multi-files(like c# partial)

George L. Jackson6-Oct-09 5:54

George L. Jackson

6-Oct-09 5:54

It depends on the point of view, just having multiple physical files or having both multiple physical files and the method of class construction. Yes, you can use multiple files (header/source) in C++ as you do in C#. However, the C# partial class is constructed more like a C++ class-namespace hybrid where you can define methods and data members in multiple source files that somehow come together in the scope of one class.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

String pass by reference

carlo.andreoli2-Oct-09 0:32

carlo.andreoli

2-Oct-09 0:32

ok i'm anoob in cli and i'm sure this quesiton has a simple answer ...but i'm new to managed code so...

what i wanna do is:

void mod_str(String ^bb) {
    bb="bau";
}
void action() {
    String ^str="ciao";
    mod_str(str);
    this->button1->Text=str;
}

what i wanna is that this button1 text became "bau" but with this code it remains "ciao"...

in c++ it wolud be something like...

void mod_str(string &str) {
    str="bau";
}

void action() {
    string str="ciao";
    mod_str(str);
    ....
}

Re: String pass by reference

teejayem2-Oct-09 5:28

teejayem

2-Oct-09 5:28

instead of

void mod_str(String ^bb) {
    bb="bau";
}

use

void mod_str(String ^%bb) {
    bb="bau";
}

EDIT:

This is a pretty good place to learn the keywords and operators specific to C++/CLI

http://msdn.microsoft.com/en-us/library/xey702bw.aspx[^]

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

Re: String pass by reference

carlo.andreoli5-Oct-09 2:20

carlo.andreoli

5-Oct-09 2:20

Thank you for this simple but important reply

Dual Linkage Possible with Managed DLL?

Richard Andrew x6430-Sep-09 13:13

Richard Andrew x64

30-Sep-09 13:13

Is it possible to create a DLL that exposes both a managed interface and a native one so that it can be used by both managed and native clients?

For instance, can it contain a managed class that wraps exported "C"-linkage functions, so that a managed client can see the managed class, and a native client can see the C-type functions?

Re: Dual Linkage Possible with Managed DLL?

Luc Pattyn30-Sep-09 13:30

Luc Pattyn

30-Sep-09 13:30

Hi,

I'm not aware of any official solution, and I haven't tried it yet, however I got this[^] answer more than 2 years ago on a similar question of mine.

Smile | :)

Luc Pattyn

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

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