.Net Remoting Memory Horror (IPC channel) - Managed C++/CLI Discussion Boards

Hi,

I want to expose a structure to C# code from the VC++ .

C# Code:

void AccessStructure()
{
structExample st;
st.x[0] = 4;

//Calling VC++ function

MyC++Func(st);

}

Structure declaration in vc++:

public ref struct structExample
{
public:unsigned char x[2];
public:int y;
};

VC++ function

void MyC++Func(structExample ^ stEx)
{

}

When Compiling the VC++ code i do get the following error

error C4368: cannot define 'x' as a member of managed 'structExample': mixed types are not supported

And also,
Is it possible to pass the structure as value type in the above case

Thanks in Advance

Regards
Sangeetha

This might help but certainly there is a more elegant way to achieve this:

public ref struct structExample
{
public:

structExample()
{
x = gcnew array<unsigned char>(arraysize);
}

array<unsigned char>^ x;

private:

literal int arraysize = 2;
};

Can anyone point me to some reading material or examples that would allow me to change a simple test menu program like this:

 #include <iostream> using namespace std; void main() { int iChoice; cout << "Choose one... " << endl << endl; cout << "1. First" << endl; cout << "2. Second" << endl; cout << "3. Third" << endl; cout << "4. Fourth" << endl << endl; cin >> iChoice; switch (iChoice) { case 1: if (iChoice == 1) cout << "First" << endl; break; case 2: if (iChoice == 2) cout << "Second" << endl; break; case 3: if (iChoice == 3) cout << "Third" << endl; break; case 4: if (iChoice == 4) cout << "Fourth" << endl; break; default: cout << "Not a valid choice." << endl; } } 

into a console application that uses the up and down arrows to make a selection inside of the menu box instead of typing in "1" and then "Enter"? I would like to be able to open the program with the list of options inside of a colored box and output the result into another colored box.

-- modified at 4:36 Friday 10th March, 2006

is your question .NET framework relative ?

I am working in the Visual Studio .net environment. No matter where I look, it seems I can't find any solid information on creating a simple DOS shell console application that uses keyboard events to make an up down selection menu.

I'd be surprised if there is such support in .NET for menus on a console window.
The way it was done in DOS is to output the hi-lighted menu item with inverted colors.
Mainly your program will wait for a key stroke and then pass the stroke when it arrives to a switch statement. The switch statements determines which menu items need to be re-output to the console screen - and with what colors (inverted/regular).
Note that you need to use positioning functions to be able to output text in the same spot with different colors.
I have not implemented this with the recent CRTs - so, I'm not sure what the exact function names are.

gmileka

If you need menu in doos shel, then you must use graphic ap0proach of programing and itersept cursor key.

or:

when you press up or down key, then clear scrren and selected menu shoud be diffrent color or higlitet

Hi,

i have an application which is running as a windows service,
it's purpose is to poll different sensors in a specific interval. No problem so far and with .Net memory profiler i was able to reduce the memory consumption drastically (allocs are almost -> 0 byte/s).

But now the downside, my idea was to present the sensors data on a ASP.NET page. My first thought was using a webservice to connect the windows service with the IIS. However after reading a comparison between Remoting vs. Webservices i decided to do remoting with an IPC channel.

So far so good, i have implemented a very light Remoting object, in addition i use the IPC channel and binary formatters. But when my application was finally running i discoverd that each remoting call will take around 8 KB of memory! Furthermore it allocates at least 178! Instances of differnt .Net classes for each call.

Imagine that i have to update my data on the IIS every second and addionally i have more than one sensor. This would mean for example that 5 Sensors would cost 40 KB or more memory per second, surely the garbage collector will take care of it. But how long will it take until i get in serious memory trouble (like Memory Pressure by the framework)? I saw that the garbage collector is triggered every 10 s in the current setup (without remoting it's between 45 min - 2h)

There are a couple of Questions:

1. Is it possible to reduce the memory consumption of .Net remoting? (i saw no difference between singleton & singecall)

2. Is remoting not the right choice for my task?

BTW: The service is written in C++/CLI, the logic and pages on the IIS are in C#.

I would really appreciate any help! If needed i could also publish some code to resolve the issue.

ThanX Tobias

the remoting Interface (each call of GetIndex costs 8KB):

public interface class IRemotingLink
{
ArrayList^ GetSensorKeys (void);
array <unsigned char>^ GetIndex (String^ pSensorGuid, unsigned char pIndex);
array <array <unsigned char>^>^ GetIndices (String^ pSensorGuid);
bool SetIndex (String^ pSensorGuid, unsigned char pIndex, array <unsigned char>^ pIndexContent);
};

-- modified at 2:34 Friday 10th March, 2006

[Message Deleted]

You really think people here will do your homework for you ?
If you want an answer, post specific questions and post what you already did.

thk for u all...i knw my fault...
i cant do tat like tis...sorry for disturd u all....
very apologize wit it....

http://www.retacoder.com[^]

http://www.rentacoder.com[^]

The tigress is here Big Grin | :-D

yup, typo... Wink | ;)

cusack! this is professor ulhas from the university. it told all of student to not cheat by gone to cpian and make others doubt the homework. but here i see u cheating. when i heard of this i wanted to slice my tongue open and a salted knife. that is how much ur cheatin hurts me. now u get black grade and fail. Cry | :((

Sincelery yours, Computer Information conSciences Professor and grader, Sharada Ulhas

thk for u all...i knw my fault...
i cant do tat like tis...sorry for disturd u all....
very apologize wit it....
im 2 care of my homework...
i scare will fail...i really no idea how 2 done..
whatever,i will take more time to revision all the things...
thk a lot

This CP forum is for people who can't continue their work, becase of the problem they can't solve. If you have a problem then ask if you want to other make your program, then don't even ask and start thinking.

i will not give up, i will convet this if its the last thing i do....

i am getting better though!!

void ManagedReadVoltage::ManagedDAQmxBaseCreateTask(const char taskName __gc[], TaskHandle *taskHandle)
{
DAQmxBaseCreateTask(taskName,taskHandle);
}

i am stuck here, i get this error...

'DAQmxBaseCreateTask' : cannot convert parameter 1 from 'const char __gc[]' to 'const char []'

the orginal code...

void UnmanagedReadVoltage::UnmanagedDAQmxBaseCreateTask(const char taskName[], TaskHandle *taskHandle)
{
DAQmxBaseCreateTask(taskName,taskHandle);
}

i have looked on google, but i can't get it working..anyway i need some sleep Sleepy | :zzz:

thanks

You need to pin the managed array before passing it to a function that's expecting a native array.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Here is the code:

<br />
//file class1.h<br />
#include "class2.h"<br />
<br />
class A<br />
{<br />
public:<br />
  A(void) {}<br />
  ~A(void) { if ( _cls2) delete _cls2; }<br />
public:<br />
  void Create(void) { _cls2 = new B(this); } // pass class itself to class2<br />
  void Display(void) { printf("from A"); }<br />
private:<br />
  B * _cls2;<br />
};<br />
<br />
// file class2.h<br />
#include "class1.h"<br />
<br />
class B<br />
{<br />
public:<br />
  B(A * ptr) : _cls1(ptr) {}<br />
  ~B(void) {}<br />
public:<br />
  void Do(void) { _cls1->Display(); }<br />
private:<br />
  A * _cls1;<br />
};<br />

But I got error on compiling Frown | :(

How to solve it?

in one of the files, before the definition of the class, declare the other one.

for example :

class A;
 
class B {
    //...
};

You mean combine two .h files into one .h file?

Is it possible to solve it in two .h files?

THX for your quick reply Smile | :)

shaohao wrote:
You mean combine two .h files into one .h file?

no

file A.h
 
#include "B.h"
 
class A {
    //...
};

file B.h
 
#include "A.h"
 
class A;
class B {
    //...
};

But I think it should be:

<br />
file A.h<br />
<br />
#include "B.h"<br />
<br />
class A {<br />
    //...<br />
};<br />

<br />
file B.h<br />
<br />
// not include A.h<br />
class A;<br />
<br />
class B {<br />
    //...<br />
};<br />

Any idea?
Is it right?
-- modified at 9:11 Friday 10th March, 2006

Yes - this is correct. It compiles without a problem.

gmileka