Accessing Unmanaged C++ from C# - Managed C++/CLI Discussion Boards

Hi all.

1.
I have a native struct with a pointer member.

typedef struct someStruct SomeStruct;<br />
struct someStruct{<br />
   ...<br />
   SomeStruct     *tp_nextp;<br />
};

I'm hosting that struct in a managed class as a field.

Do I need to use the delete keyword on the pointer when the managed object is disposed?

2.
If I put a pointer to a member of that struct, does it need to be deleted?

Thanks,
Yaakov

What I had seen when I was using MC++ was that if I had a COM object that was used inside of a managed object, the memory and the COM object would be cleaned up but only after the application exited, not when the managed object went away. We had to call a function to delete the COM object when we wanted to when the managed object was disposed. Not sure if it would be the same for you, but you could always turn that unmanaged struct into a class and put some code into the destructor to see when it gets called.

Steve Maier, MCSD MCAD

I am trying to create a flash movie from within an MFC (MDI) application. The movie must receive information from the program, but not necessarily send anything.
I am aware that I might need to launch IE to run the flash file, so help with that is also appreciated.
Here's what I am looking for:
1. What libraries do I need, and where to get them?
2. Perhaps a code snippet or documentation reference.
3. Code to launch IE (unless there's a way to display a flash movie in a regular MFC view).
Thanks

PS: Sorry if this is the wrong forum.. still learning the ropes.

When the going gets tough... write a computer program to do it for you

FayezElFar wrote:
PS: Sorry if this is the wrong forum.. still learning the ropes.

yep, it is. This is the managed C++ forum, for questions about C++ that's been made next to useless by the .NET framework. You need to ask in the C++ forum.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

You seem to dislike Managed C++, don't you? Big Grin | :-D

--
Affordable Windows-based CMS: www.zeta-producer.com

Well, yeah, I do, but I come to this forum regularly to point people who obviously have no idea what MC++ is in the right direction. This forum seems (rightly) to be a ghost town, so I reckon a lot of people who would get answers quickly, don't because they mistakenly post here.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Hi guys,
I've implementing a simple class that creates a mutex and release it in the destructor (finalize), but everytime the application is closing a ObjectDisposedException is thrown. Source code here:

public __gc class SingleInstance
{
public:
SingleInstance(String *mutexName) {
m_mutex = new Mutex(false, mutexName);
}
virtual ~SingleInstance(void) {
if (m_mutex)
m_mutex->ReleaseMutex(); <--- !exception here!
}

public:
bool IsAnotherInstanceRunning() { return !m_mutex->WaitOne(10,true); }
private:
Mutex *m_mutex;
};

Can anyone of you tellme why this is happening? m_mutex is not supposed to be already disposed! Should I avoid dispose of m_mutex object? How?

Regards and thanx in advance,
Francesco

The problem I am having deals with wrapping an unmanaged C++ class which uses iostream and sends output to cout and then using the managed class in C#. When I make a method call on this class, I get the following error:

*** Exception! ***
Method: std.basic_ostream<char,std::char_traits<char> >* std.operator<<<struct std::char_traits<char=""> >(std.basic_ostream<char,std::char_traits<char> >*, SByte*)
Message: Object reference not set to an instance of an object.

When I replace the cout call with a call to printf, I do not get an error.

Here is the corresponding code. Thanks for the help or direction where I can get help.

USimple.h

#pragma once

__nogc
class USimple
{
public:
void PrintIt( );
};

USimple.cpp

#include "stdafx.h"

#include <iostream>
//#include <stdio.h>
#include "MSimple.h"
#include "USimple.h"

void USimple::PrintIt()
{
std::cout << "Hello, World" << std::endl;
// printf( "Hello, World\n" );
}

MSimple.h

#pragma once

#include "USimple.h"

using namespace System;

public __gc class MSimple
{
private:
USimple __nogc* m_pUSimp;

public:
MSimple( );
~MSimple();

void PrintIt( );
};

MSimple.h

#include "stdafx.h"

#include "USimple.h"
#include "MSimple.h"

MSimple::MSimple( )
{
m_pUSimp = new USimple( );
}

MSimple::~MSimple()
{
delete m_pUSimp;
}

void MSimple::PrintIt( )
{
m_pUSimp->PrintIt( );
}

Class1.cs

using System;

namespace CsSimple
{
///

/// Summary description for Class1.
///

class Class1
{
///

/// The main entry point for the application.
///

[STAThread]
static void Main(string[] args)
{
try
{
MSimple simple = new MSimple( );
simple.PrintIt( );
}
catch( Exception e )
{
Console.WriteLine( "\n*** Exception! ***" );
Console.WriteLine( "Method: {0}", e.TargetSite );
Console.WriteLine( "Message: {0}", e.Message );
}

Console.WriteLine( "Press enter to exit" );
Console.Read(); // Wait for enter pressed to end programme
}
}
}

Thanks again,

John Stedman

hi all there, i want a code that help me to insert any file type in a rtf file, i need to insert by code not drag drop by mouse so plzzzzzzzzzzzzz help me .......

Thanks alot
Metal Man

Try asking in the C++ forum.

Isn't rtf rich text format ? How can you insert 'any file type' into a text file ?

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

hi,

from reading the subject title... its easy... but what i really want to do is this:

say for example...

int a = 1;
int b = 2;

int number = a + b;
int number is therefore 3

HOWEVER... what i want it to do is...

to make int number 12 instead of adding it and making 3. i want the two ints together so it forms an int number of 12.

does anyone know how to do this in c++ please? something to do with strings?

thank u very much.

Seeing as you're asking in the MC++ forum, just call the ToString() method on the numbers a and b, and you'll get a string which you can convert back into a number.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Another, old school, method is using good ol' sprintf / atoi combo

int nNum1 = 1;
int nNum2 = 2;
char caTempBuf[10];

sprintf(caTempBuf, "%d%d", nNum1, nNum2); //concatination here
int nConcatinated_Number = atoi(caTempBuf);

that should work.

When the going gets tough... write a computer program to do the thing for you

Or, if you wanted something really old school (and kind of limited) you could do something like the following:

<br />
  int a=1, b=2;<br />
  char[3] c;<br />
  c[0] = a + '0'; // character form of '1'<br />
  c[1] = b + '0'; // character form of '2'<br />
  c[2] = '\0';    // terminate the string<br />
  cout << c << endl;<br />

but, like I said, this is kind of limited if you're doing anything with bigger or negative numbers.

Democracy for the USA!

int a = 1;<br />
int b = 2;<br />
int number;<br />
std::stringstream ss;<br />
ss << a << b;<br />
ss >> number;

Hi all,
I am doing my first setup project for the addin I wrote and can't solve following problem.
I want to deploy an addin for Visual studio. So I need to look in registry for the HKLM\SOFTWARE\Microsoft\VisualStudio\7.X\InstallDir (where 7.X is 7.0 or 7.1) and take it into MyPATH0 and MyPATH1 variables. For the installed version(s) I need to make TARGETDIR to MyPATH0\..\..\\Vc7\VCWizards.
I have no idea how to solve this. Setup wizard seems to have very simple logic, so how can I program in the wizard
"
1.TAKE REGISTRY KEY XX\7.0 into VAR
2. If success Make VAR+AAA to the TARGET DIR
3.Install
4.TAKE REGISTRY KEY XX\7.1 into VAR+AAA
5. If success Make VAR to the TARGET DIR
"
Thank you very much for your help,
Boni

Im having a little trouble storing the outputs in an array. while the compiler is running i can get the correct output, but cant set up the array for using the results later on. any help would be greatfully appreciated.

What I want in the array is time_of_arrival results from the following function;

CComplexVector process_the_ray(CRay3d a_ray,int m)<br />
{ <br />
	CComplexVector result ; <br />
	double the_distance ; <br />
	int i ; <br />
	double length;<br />
<br />
<br />
	result =  inc_field( (a_ray.listnode(0)).listpoint(),(a_ray.listnode(1)).listpoint(),m ) ; <br />
	the_distance = (a_ray.listnode(1).listpoint() - a_ray.listnode(0).listpoint()).abs() ; <br />
	<br />
<br />
		for( i =  1 ; i < a_ray.non() - 1  ; i++) { <br />
			if( a_ray.listnode(i).listtype() == 1) <br />
			result = calculate_reflection(result, a_ray.listnode(i-1) , a_ray.listnode(i), a_ray.listnode(i+1) , the_distance) ; <br />
			<br />
			if( a_ray.listnode(i).listtype() == 2) <br />
			result = calculate_transmission(result, a_ray.listnode(i-1) , a_ray.listnode(i), a_ray.listnode(i+1) , the_distance) ; <br />
			<br />
		<br />
		    the_distance += (a_ray.listnode(i+1).listpoint() - a_ray.listnode(i).listpoint()).abs() ; <br />
				<br />
			} <br />
<br />
		<br />
	    	length=the_distance;<br />
			cout<< "length is:" <<length<<endl;<br />
			<br />
			time_of_arrival=(length/c);<br />
			<br />
		    cout<<"time_of_arrival:"<<time_of_arrival<<endl;<br />
			<br />
	return result; <br />
<br />
}

How do I overload that operator?

I wrote a ref class, and I want to implement [] operator. I tried various ways, without success.

What is the exact synrax?

I Hate MC++.

Thanks.

I don't use MC++, but the operator signatures for operator[] in
most flavors of C++ is typically as follows:

// return element for read/write
T& operator[](int index);

// return element for read-only
const T& operator[](int index) const;

Hope that was what you were looking for.

How can I detect a incoming phone call and display the number on the screen using C++ program
If possible send a code

Jack

Brilliant.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Maximilien Lincourt
Your Head A Splode - Strong Bad

Hi!

I'm working with Borland C++ Builder 6 and i need to get the mirror of a text; it means that a string has to be flipped. In other words, i don't need only that the characters of a string change order ('mirror' becomes 'rorrim'), but also the single font must be flipped (not using a mirrored font). How can i obtain that? I tried by inverting the order of the pixels of the Canvas in which the text is drawn, but in this way the software get too slow.
Please, give me help!
Thanks a lot

Bye

Borlard cannot compile managed C++.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

I'm new to managed C++ and I am looking at MCppWrapper, one of the 'Cross-Language Samples' in the help for Visual Studio.NET. It shows how managed C++ can wrap unmanaged C++ and then be used by C#.

Two questions:
- The unmanaged code returns a dynamically allocated char*, which the managed C++ casts to a String*, which the C# uses as a String object. At what point (and how) does the char* become a String object with its properties set, e.g. Length?
- How and when does this char* allocated by unmanaged code get freed? Can the Garbage collector do that?

Thanks!

John Frank