Managed C++/CLI

Re: Convert System::String* str[] to const char* chars[] array!

10-Oct-09 8:23

Hey thanks Navneeth!

Actually what I am trying to do is...

I have on Static DLL which I am exposing to c# using Managed C++ library, so that I can use it directly, will not have overhead of registering and de-registering (id I develop COM DLL to expose static DLL functionality to C# client)

Now, the problem is I am Passing "System::Double dd[][]" as argument to Managed C++ as a function argument and I want to convert the passed double array to array used in the function(so that I can forward it to Static DLL), However while doing

doubleArray[0 , 0] = dd[0][0];  //this statement is throwing error C2440: 'initializing' : cannot convert from 'double __gc *' to 'double'

I am clueless about how to get rid of this error

Can I use this code provided by you

array<double, 2>^ doubleArray = gcnew array<double, 2>(2, 2);
doubleArray[0 , 0] = 10;
doubleArray[0 , 1] = 11;
doubleArray[1 , 0] = 12;
doubleArray[1 , 1] = 13;

or there is any other way to type cast?

Thanks in advance Navneeth!!

N a v a n e e t h10-Oct-09 17:58

Re: Convert System::String* str[] to const char* chars[] array!

10-Oct-09 17:58

You want to accept managed array as parameter and pass that to a native function that expects a native double array, right? Here is how you do it:

C++

void Function(array<double, 2>^ doubleArray)
{
	double nativeArray[2][2];
	for(int i = 0; i < 2; i++)
	{
		for(int j = 0; j < 2; j++)
		{
			nativeArray[i][j] = doubleArray[i , j];
		}
	}
}

I reiterate, please avoid using the obsolete syntax and use C++/CLI style syntax. Compile with /clr switch rather than /clr:oldsyntax.

Navaneeth

How to use google | Ask smart questions

Cracked-Down10-Oct-09 20:40

File handling with "fstream"

10-Oct-09 20:40

thanks Navaneeth!

Fenix27-Oct-09 23:27

7-Oct-09 23:27

I can't use ofstream in my form..

it says...
Unknown Identifier.

And YES I included "fstream"...
But it's not fstream.h... it's the simple fstream.

What should I do?

Either that or...

Fenix27-Oct-09 23:57

7-Oct-09 23:57

How do you use savefiledialog?

Richard MacCutchan8-Oct-09 2:15

8-Oct-09 2:15

Fenix2 wrote:
How do you use savefiledialog?

Like this[^]!

Fenix28-Oct-09 4:01

8-Oct-09 4:01

Now... how do I write a variable in it?
It only uses stream.write and that write only writes arrays..
Plus I'm having hard time using arrays..
It seemed like streamwriter.writeline would work fine.
But it's different from stream...
what can I do?

Richard MacCutchan8-Oct-09 4:13

8-Oct-09 4:13

Fenix2 wrote:
Now... how do I write a variable in it?

In what?

Fenix2 wrote:
what can I do?

From the above questions, I think spend some time studying C++/CLI. There is too much here for a simple answer.

Fenix28-Oct-09 16:24

8-Oct-09 16:24

I can't study it more than that..
I don't have a book,
I don't have a class on it,
And furthermore, all the darn examples on C++ web browsers won't work.
I'm trying to write a variable in a file.
I got the dialog working and the creation of the file FINE.
But when it comes to writing arrays wich are definitely the only variable type that has NO Meaning IN LIFE at all...
I used to program in pascal turbo...
But in a whole game programming I never used arrays.
And I'M not gonna start here... You hear me man?
So tell me...
How do I write a variable in a damn file??!?

Fenix28-Oct-09 16:32

8-Oct-09 16:32

Sorry fort this upsetting.
It makes me mad when a guy tells me to study a language when that is Exactly what I am trying to do...

Richard MacCutchan8-Oct-09 22:11

8-Oct-09 22:11

Fenix2 wrote:
It makes me mad when a guy tells me to study a language when that is Exactly what I am trying to do...

Well it does not appear that you are. What you are doing is posting questions one at a time and asking someone here to write the code for you. Studying means actually sitting down with a book, online tutorial etc and working through it until you understand it. The fact that you don't understand arrays suggests you have a long way to go.

N a v a n e e t h8-Oct-09 16:54

8-Oct-09 16:54

Fenix2 wrote:
I don't have a book,

Living in Canada and can't get a book? Confused | :confused:

Fenix2 wrote:
And furthermore, all the darn examples on C++ web browsers won't work.

You may be referring to incorrect links.

Fenix2 wrote:
But in a whole game programming I never used arrays.
And I'M not gonna start here

Interesting. So are you looking for a syntax of writing managed arrays? Here is how you write a simple integer array.

C++

array<int>^ arr = gcnew array<int>(2);

// Adding values
arr[0] = 26;
arr[1] = 18;

Fenix2 wrote:
How do I write a variable in a damn file??!

Here is how you write array of strings to a file.

C++

using namespace System;
using namespace System::IO;

typedef array<String^> StringArray;

void WriteArrayToFile(StringArray^ arr)
{
	StreamWriter writer("c:\\test.txt", false);
	for each(String^ str in arr)
	{
		writer.WriteLine(str);
	}
}

Use it like:

C++

StringArray^ arr = gcnew StringArray(2);
arr[0] = "You need";
arr[1] = "a good book";
WriteArrayToFile(arr);

All I can say is, grow up, read the posting guidelines and post your question nicely with relevant code and change your attitude if you expect help from this forums.

If you ever plan to read a book, try this[^]

Smile | :)

Navaneeth

How to use google | Ask smart questions

Fenix29-Oct-09 14:17

9-Oct-09 14:17

Niice
this will probably help me...
I gotta try it...
I'm 22 years old, I don't have money to spend on books... there are poor people on canada and managin to get a 2300$ computer 3 years ago made me full of school loans. (Lol...)

Richard MacCutchan9-Oct-09 23:24

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

9-Oct-09 23:24

Fenix2 wrote:
I don't have money to spend on books...

Do you have a library near you where you could borrow one?

Even if not, you obviously have access to the internet and there are thousands of good tutorials around, just try searching this site and use google. That's what the rest of us have to do.

Cracked-Down7-Oct-09 21:27

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

7-Oct-09 21:27

HI all,
I am getting this error since morning, I am clue less as I am working first time on it (I am c# developer).

the code file are as follows and i compied using Commnad prompt
command cl /clr:oldSyntax DemoCPP.cpp

DemoCPP.cpp class

#include "DemoHeader.h"

DemoCPP::DemoCPP()
	: Length(0.00), Height(0.00)
{
}

DemoCPP::DemoCPP(double L, double H)
	: Length(L), Height(H)
{
}

DemoCPP::~DemoCPP()
{
}

double DemoCPP::getLength()
{
	return Length;
}

void DemoCPP::setLength(double L)
{
	Length = L;
}

double DemoCPP::getHeight()
{
	return Height;
}

void DemoCPP::setHeight(double H)
{
	Height = H;
}

void DemoCPP::setDimensions(double L, double H)
{
	setLength(L);
	setHeight(H);
}

double DemoCPP::Perimeter()
{
	return 2 * (Length + Height);
}

double DemoCPP::Area()
{
	return Length * Height;
}

header file DemoHeader.h

#pragma once
#using <mscorlib.dll>

__gc 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;
};

any body have any idea how to resolve this problem?

thanks in advance!

KarstenK7-Oct-09 22:21

KarstenK

7-Oct-09 22:21

google hits: http://msdn.microsoft.com/en-us/library/ky737ya4%28VS.80%29.aspx[^]

Did you create your dll project with a wizard. (If not do it)

Press F1 for help or google it.
Greetings from Germany

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 22:31

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

7-Oct-09 22:31

Since this is a DLL, you need to compile with /DLL compiler switch. BTW, why are you using old syntax?

Navaneeth

How to use google | Ask smart questions

Cracked-Down7-Oct-09 22:39

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

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!

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

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

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

How to use google | Ask smart questions

Cracked-Down7-Oct-09 23:24

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

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#

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

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

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

How to use google | Ask smart questions

Cracked-Down7-Oct-09 23:19

How do I get Image_click to work more than once?

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

Fenix26-Oct-09 16:27

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

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");}
										};
									};
								};
						};
							 
			 };
		 };
};

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