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

Re: Getting "LINK : Fetal error LNK1561 : entry point must be defined" while creating managed C++ dll in VS2005

Cracked-Down7-Oct-09 22:39

7-Oct-09 22:39

Thanks for quick response!

Yes I have googled a lot and then placed question here...

the Old command i am using because it is recommended by the VS2005 when i tried to build the project from vs2005

I tried the project type as empty project as well as class library!

still I am getting the same error!

I have created the project using wizard itself!
any further help!

thanks in advance!

Re: Getting "LINK : Fetal error LNK1561 : entry point must be defined" while creating managed C++ dll in VS2005

N a v a n e e t h7-Oct-09 22:52

N a v a n e e t h

7-Oct-09 22:52

If you have VS, don't do command compilation. I never came across a situation where VS recommended old syntax. If you need to create a fully managed assembly, choose Class Library project type. Use new syntax and compile using /clr:safe.

if you need to communicate with native libraries, compile with /clr switch which will produce mixed assemblies. Since you have VS IDE, best option is to use it to compile rather than doing through command. VS does things like manifest embedding automatically.

Navaneeth

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Re: Getting "LINK : Fetal error LNK1561 : entry point must be defined" while creating managed C++ dll in VS2005

Cracked-Down7-Oct-09 23:24

Cracked-Down

7-Oct-09 23:24

thanks navneeth for ypur reply

I tried using /clr:safe option however i got the following error

Error	1	error C4980: '__gc' : use of this keyword requires /clr:oldSyntax command line option	d:\excercise\dot net\cppclasslibrary\cppclasslibrary\CPPCLassLibrary.h

8

so as suggested I used the /clr:oldSyntax

and option _gc I am using as i want to consume this class libray in c#

Re: Getting "LINK : Fetal error LNK1561 : entry point must be defined" while creating managed C++ dll in VS2005

N a v a n e e t h7-Oct-09 23:41

N a v a n e e t h

7-Oct-09 23:41

Here is your class using new syntax.

C++

#pragma once

using namespace System;

ref class DemoCPP
{
public:
	DemoCPP();
	DemoCPP(double L, double H);
	~DemoCPP();
	double getLength();
	void setLength(double L);
	double getHeight();
	void setHeight(double H);
	void setDimensions(double L, double H);
	double Perimeter();
	double Area();
private:
	double Length;
	double Height;
};

Now compile using /clr or /clr:safe.

Navaneeth

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Re: Getting "LINK : Fetal error LNK1561 : entry point must be defined" while creating managed C++ dll in VS2005

Cracked-Down7-Oct-09 23:19

Cracked-Down

7-Oct-09 23:19

I got the Answer Smile | :)

here it is

1. Project Properties -> General Tab
2. for Common Language Runtime Support select Old Syntax (/clr:oldSyntax) from drop down

now you do not need to play with command line ..... Smile | :)

you can easily build your project from visual studio IDE itself

How do I get Image_click to work more than once?

Fenix26-Oct-09 16:27

Fenix2

6-Oct-09 16:27

Here's some code :

private: System::Void TS11_MCli(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
			 				Tsn11 = Tsn11 + 1 ;
				 if (Tsn11 = 0) {  this->TS11->Image = Image::FromFile("C:/GamePics/NOTILE.png");}
					else {
						if (Tsn11 = 1){  this->TS11->Image = Image::FromFile("C:/GamePics/GREEN.png");}
							else {
								if (Tsn11 = 2){  this->TS11->Image = Image::FromFile("C:/GamePics/GRTRE.png");}
								else {
									if (Tsn11 = 3){  this->TS11->Image = Image::FromFile("C:/GamePics/ROAD.png");}
									else {
										if (Tsn11 = 4){  this->TS11->Image = Image::FromFile("C:/GamePics/WALL.png");}
										};
									};
								};
						};
							 
			 };
		 };
};

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

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

N a v a n e e t h

6-Oct-09 17:17

Your questions is not clear. Please explain it clearly.

Also the code posted is less readable. Please remove unnecessary spaces and format it nicely. I think a switch case makes more sense here than nested if.

Navaneeth

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

Fenix27-Oct-09 1:42

Fenix2

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()
    {
    }
}

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