C / C++ / MFC

Interacting with Java servlets

21-Mar-02 22:40

Take a look at the webbrowser control (in shdocvw.dll with html-rendering in mshtml.dll). A place to start is by searching MSDN for interfaces starting with IHTML*** .

/moliate

Nish Nishant21-Mar-02 21:57

21-Mar-02 21:57

The bad news is getting worse for me.
Now it seems I gotta accept java serialized objects using C++.
Anyone here has any idea how I can do that.
Is there some kinda wrapper thing that'll convert the java object to a decent C++ struct for me???

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

moliate21-Mar-02 23:40

21-Mar-02 23:40

That seems like a rather hard task, unless you can make the java object speak XML...

Otherwise you may have to do the converting yourself. If you know how the object looks, it is not that much trouble.. The object serialization specification can be found here.

/moliate

Nish Nishant21-Mar-02 23:53

21-Mar-02 23:53

Nope. The java team said they'd like to avoid XML. And personally I'd like to avoid XML as well.

I simply want to convert a Java object to a struct I can read using C++. It that a herculean task???

Nish Frown | :-(

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

moliate22-Mar-02 0:11

22-Mar-02 0:11

Depends on how the object look. If it is just some integers, chars and booleans, it is not that though. Take a look at the binary of the serialized object. If it contains a lot of 'L' (means member is a class) it might be a bit hard. There are some commersial alternatives ("Tools.h++" one is called, I think), but if you have a well-defined object, you can probably do it yourself.

/moliate

Nish Nishant22-Mar-02 0:51

22-Mar-02 0:51

Wasnt there something called JNLI [java native language interface] which allowed Java to talk with C++

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

moliate22-Mar-02 2:14

22-Mar-02 2:14

As far as I know (but that isn't really much on JNI), JNI makes you open a JVM in which you can recreate the serialized object. You can then access fields and methods by indexes that the JVM provides you with. To me it seems like a cumbersome approach.

Another method might be to write an Java COM server. This might be a somewhat simpler method. Take a look at the javareg.exe utility (in MS Java SDK) for this.

But if you just want to read a simple object that has been serialized, the easiest method might still be to read and reinterpret it directly from disk.

/moliate

moliate22-Mar-02 9:19

a simple program using array

22-Mar-02 9:19

I have experimented a bit with this at home. Seems like building a Java COM server is really not much trouble...

If you want to take a look at a simple example, you can download what I put together below (32 kb):

http://www.efd.lth.se/~f95hsp/javaser.zip

Cheers
/moliate

ken77721-Mar-02 21:38

ken777

21-Mar-02 21:38

I need some help on this program. Can anyone tell me what I am missing here.
When I execute the program, it has one error (syntax error : 'if')

Here is a complete program. It'll ask the user to input 10 integers, then display the smallest and largest interger entered. thanks alot

#include <iostream.h>
void main(void)
{
int Array[10], smallest, largest, value;
cout << "Please enter 10 values ";
cin >> Array[value];
smallest=Array[0];
largest=Array[0];
for (value =0; value<10; value++)
{

if (smallest<=Array[value])

smallest=Array[value];
cout << "The smallest value is " << smallest <<

if (largest>=Array[value])
largest=Array[value];
cout << "The largest value is " << largest << endl;
}
}

Jack Handy21-Mar-02 21:39

Jack Handy

21-Mar-02 21:39

ken777 wrote:
cout << "The smallest value is " << smallest <<

It looks like you are missing an endl; here

Nish Nishant21-Mar-02 21:55

21-Mar-02 21:55

Not only that. The program seemed to be quite broken.
That's why I posted a small sample program.

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Tomasz Sowinski21-Mar-02 23:40

Tomasz Sowinski

21-Mar-02 23:40

Nish [BusterBoy] wrote:
Imagine 16 of me, dancing wild...

You're dancing in very synchronized manner, Nish. I can see an opportunity for carreer in showbiz.

Smile | :)

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Nish Nishant21-Mar-02 23:46

21-Mar-02 23:46

Tomasz Sowinski wrote:
You're dancing in very synchronized manner, Nish. I can see an opportunity for carreer in showbiz.

Thanks. Smile | :)

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Nish Nishant21-Mar-02 21:53

21-Mar-02 21:53

#include "stdafx.h"
#include <iostream>


int main(int argc, char* argv[])
{
int ar[10],sm,lg,value;
for(value=0;value<10;value++)
std::cin >> ar[value];
sm=lg=ar[0];
for(value=0;value<10;value++)
{ 
if(ar[value]<sm)
sm=ar[value];
if(ar[value]>lg)
lg=ar[value];
}
std::cout << "smallest " << sm << "\r\n";
std::cout << "largest " << lg << "\r\n";
return 0;
}

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Form Designer

Nish Nishant21-Mar-02 21:31

21-Mar-02 21:31

There is a pretty good chance that I might be asked to write a form designer of sorts. MFC is allowed I guess.

But is there any specific path I need to follow? Are there any pre-made class libraries for this.

basic functionality includes the ability to drag and drop controls [edit boxes, combos, static boxes etc.] into an area and to be able to resize them with the mouse. Also move them around and arrange them.

It's a big ask Frown | :-(

I need to basically mimic the C#/VB form designer.

Any ideas are hugely appreciated...

Also, how do I then save it. I need to pass all this information a a server via HTTP. Need to POST data to a Java Servlet. I wonder how I can do that.

Anyway will XML be a nice way to save all this stuff???

Means also using expat or MS XML parse Frown | :-(

Nish

Chris,

Can I have a Johnny Bravo icon please?
Please, please, please........

Tomasz Sowinski21-Mar-02 23:44

Tomasz Sowinski

21-Mar-02 23:44

Designed form will be a web form? Or Win32 dialog?

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Nish Nishant22-Mar-02 0:00

22-Mar-02 0:00

Tomasz Sowinski wrote:
Designed form will be a web form? Or Win32 dialog?

The form will be shown in various places

(1) a web form generated by jsp/servlets
(2) a java application on linux
(3) a win32 application
(4) palm devices

The saved form will be mostly meta data. A form will consist of multiple controls and I just save their information like size, position, other custom data. Then of course there are a lot of non-visual components associated with each form and I am anticipating a MASSIVE headache for me Frown | :-(

Nish

p.s. right now I am takin it one at a time and focussin g on the drag-drop-form-designer tool

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Tomasz Sowinski22-Mar-02 0:10

Tomasz Sowinski

22-Mar-02 0:10

Doesn't sound good to me. If you need one form for the web, Win32 and other platforms, you'll need to adopt lowest common denominator approach - note that you can't place a control at (x, y) on the web page. There's something called positioning style sheets, but AFAIR it's not available on all browsers.

Ask your bosses if they really need one form for everything Smile | :)

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Nish Nishant22-Mar-02 0:48

22-Mar-02 0:48

Tomasz Sowinski wrote:
If you need one form for the web, Win32 and other platforms, you'll need to adopt lowest common denominator approach

This is supposed to be some kind of platform independent form. The actual rendering of the form would vary between end interfaces.

All I know is I am in deep waters now...
Expect lots of GDI doubts from poor me

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Inheritance

Jack Handy21-Mar-02 21:10

Jack Handy

21-Mar-02 21:10

I have a class CField with a public function Paint() and I derive a class from it called CMyField. I then create a CMyField m_Field private (or public) object in another class and get this error:

error C2248: 'Paint' : cannot access public member declared in class 'CField'

Any ideas?

Thanks,

Jack

Re: Inheritance

Nish Nishant21-Mar-02 21:23

21-Mar-02 21:23

Can you show us your class definition line for CMyField?

Nish

Chris,

Can I have a Johnny Bravo icon please?
Please, please, please........

Re: Inheritance

Jack Handy21-Mar-02 21:26

Jack Handy

21-Mar-02 21:26

The CField class:

class CField {
public:
	CField();
	virtual ~CField();
	void Paint();
	...
};

The CMyField class:

class CMyField : CField {
public:
	CMyField();
	...
};

Re: Inheritance

Nish Nishant21-Mar-02 21:35