C / C++ / MFC

10-Dec-11 9:01

I try this[^] CControlBar, and goes very well .. into CMainFrame ... I try to implement it into CChildFrame, but has failed ... it can be dock an CControlBar ( or extended ) into CChildFrame ?

Thanks !

Richard MacCutchan10-Dec-11 22:09

10-Dec-11 22:09

See here[^].

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

_Flaviu11-Dec-11 6:03

11-Dec-11 6:03

This[^] is the first solution that I've tried, but seems not working in CControlBar case ...

Richard MacCutchan11-Dec-11 22:10

11-Dec-11 22:10

Flaviu2 wrote:
but seems not working

Which means?

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

_Flaviu11-Dec-11 22:38

11-Dec-11 22:38

I try in this way :

C++

// ChildFrm.h
protected:
   CControlBarExt m_wndControlBar;
   CTestDialog m_cDialog;

and

C++

int CChildFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if(CMDIChildWnd::OnCreate(lpCreateStruct) == -1)return -1;

	// TODO: Add your specialized creation code here

	if(! m_wndControlBar.Create(this, &m_cDialog, CString("ControlBar Demo"), IDD_DIALOG1))
	{
		TRACE0("Failed to create dialogbar\n");
		return -1;      // fail to create
	}

	m_wndControlBar.SetBarStyle(m_wndControlBar.GetBarStyle() | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);
	m_wndControlBar.EnableDocking(CBRS_ALIGN_ANY);
	DockControlBar(&m_wndControlBar);

	return 0;
}

I get follow assetion failure :

C++

ASSERT(pDockBar != NULL);

In the same way can be done CCOntrolBar in CMainFrame and goes well ...

Richard MacCutchan12-Dec-11 0:35

12-Dec-11 0:35

Flaviu2 wrote:
I get follow assetion failure :

Where? We cannot see your screen so have no way of knowing where these messages appear. Please make use of your debugger and trace what is happening in your code.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

_Flaviu12-Dec-11 19:25

how to parse an algebric equation in c++?

12-Dec-11 19:25

I succeded :

C++

int CChildFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if(CMDIChildWnd::OnCreate(lpCreateStruct) == -1)return -1;

	// TODO: Add your specialized creation code here

	if(! m_wndControlBar.Create(this, &m_cDialog, CString("ControlBar Demo"), IDD_DIALOG1))
	{
		TRACE0("Failed to create dialogbar\n");
		return -1;      // fail to create
	}

	m_wndControlBar.SetBarStyle(m_wndControlBar.GetBarStyle() | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);
	m_wndControlBar.EnableDocking(CBRS_ALIGN_ANY);
	EnableDocking(CBRS_ALIGN_ANY);
	DockControlBar(&m_wndControlBar);

	return 0;
}

and goes well ... thank you very much for your patience. Bye.

rahulvishwakarma9-Dec-11 19:46

rahulvishwakarma

9-Dec-11 19:46

dear friends, I want to take input from user as :-

f(x)= y = ax^2 + bx + c

i.e. custom function input from user then parse it and then integrate it. But I have no idea how to do ir. Please help me or suggest any book.

Richard MacCutchan9-Dec-11 21:22

9-Dec-11 21:22

Try a Google search for "calculator c++", this is a fairly common sample exercise.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer9-Dec-11 23:08

9-Dec-11 23:08

If you want to write it, then that's a hard thing. If you just want to use it, look at:
Fast Mathematical Expressions Parser[^] here on codeproject!

Good luck,

Iain.

I am one of "those foreigners coming over here and stealing our jobs". Yay me!

Alan Balkany12-Dec-11 5:46

Alan Balkany

12-Dec-11 5:46

If you try to do everything at once, it's very hard. Breaking it into steps makes it simpler:

1. Turn the expression string into a list of tokens. A token can be a variable name, an operator, or a parenthesis.

2. Turn the token list into a tree of tokens, where each operator token has child tokens of its operands.

3. Integrate the lowest-level sub-expressions, than combine them according to the operators, e.g. the integral of A + B is the integral of A plus the integral of B.

====================================

For step 2, apply two rules to your token list until you have a single operator token left in the list, representing the whole expression. (If you end up with more than one token in the list, you probably started with an illegal expression):

1. If you have the pattern: "(", [token], ")", replace it with [token], i.e. delete parenthesis tokens around a single value.

2. In the most deeply-nested parentheses, replace [token] [operator] [token] in the list with [operator], and set [operator]'s left and right child-node pointers to the two token operands. Do this for the highest-precedence operators first.

How do i get the screen coordinates of an IHTMLElement?

Bram van Kampen12-Dec-11 16:00

Bram van Kampen

12-Dec-11 16:00

Hi,

Well, the End result depends very much on the lanuage definitions you assume, and, what you want to do with the end result.
You need to define Language Rules, for instance, where do f,x,y,a,b,c come from.
In 'C' the compiler builds a Symbol Table, which is a cross referenced database of all variables encountered in a module.
What do you want to do with it. If you want to store it as a 'General Formula, your best bet is probably to convert it to RPN (Reverse Polish Notation) and write an RPN Evaluator for when the rubber hits the road,

In general, I would start with writing a Scanner,the Scanner breaks down the text into Tokens

the 'C' rules are like: A Variable starts with 'A..Z','a..z' or '_'
A Variable name can then be followed with the same, and the chars '0..9'
A Numerical starts with '0..9'
A White Space is a ' '(space), '\t' or a '\n'

So , in the above, the name of the first var is 'f', the next char is a '(' which is not a
legal char for a varname. So, the First token is a Lexical Token, with Identifier 'f'
The Next Token would be a Special Token, LPAREN,
Going on in general, (Your Language Definition does not allow for comments),

I would also write a Parser
The Parser calls the scanner , to pick off tokens One by One, ignoring intervening whitespace, or comments, and creates a parsing tree (But it all still depends what you want to do with the expression in the larger scheme of things.

A Book: Writing Compilers & Interpreters (An Applied Approach) by Ronald Mak, ISBN 0-471-50968-X

Bram Smile | :)

Bram van Kampen

kartikdasani8-Dec-11 22:25

kartikdasani

8-Dec-11 22:25

I have tried to use a combination of get_offsetheight,get_offsetwidth,get_offsettop and getoffsetleft but the values returned are in reference to the immediate parent.

Re: How do i get the screen coordinates of an IHTMLElement?

Code-o-mat9-Dec-11 3:02

Code-o-mat

9-Dec-11 3:02

What do you mean by screen coordinates? Did you try "walking up" the inheritance tree, adding the offsets till you reach the top?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Re: How do i get the screen coordinates of an IHTMLElement?

Skynet_Code11-Dec-11 4:43

Skynet_Code

11-Dec-11 4:43

Hello.

That's exactly what the method you're invoking returns, the height/width referenced to its parent coordinate system.
If you want to get the offset referenced to the screen (1st level of DOM) you can get it by adding all offset values invoking recursively to 'get_offsetParent' method (n-1) times.

Hope it helps.

Regards

print n in even numbers only

Yolande MR8-Dec-11 10:15

Yolande MR

8-Dec-11 10:15

can any one give me a hint on how to write a code in for loop that prints only even numbers with an input of n?

i.e. 0, 2, 4, 6, .....

Albert Holguin8-Dec-11 10:26

Albert Holguin

8-Dec-11 10:26

What is n supposed to be?

This sounds a lot like a homework question... so I'll just give you a hint... divide by 2.

David Crow8-Dec-11 10:52

David Crow

8-Dec-11 10:52

What would YOUR code look like without the "only even numbers" constraint?

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Yolande MR8-Dec-11 11:36

Yolande MR

8-Dec-11 11:36

David: this code is for print n from 0 to n (n is an input number from the user).

int n;

cout << "Enter a number and press ENTER: ";
cin >> n;

for (int i = 0; i <= n; i = i++)
{
cout << i << " ";
}
cout << "\n";

I am suppose to do something to i++ + 2, or n-- - 2, or something.

David Crow8-Dec-11 12:20

David Crow

8-Dec-11 12:20

Yolande MR wrote:
for (int i = 0; i <= n; i = i++)

This is questionable at best. Try:

for (int i = 0; i <= n; i = i + 1)

Yolande MR wrote:
I am suppose to do something to i++ + 2, or n-- - 2, or something.

If each iteration of your loop is incrementing i by 1, then why not try incrementing by...

Albert Holguin8-Dec-11 13:06

Albert Holguin

8-Dec-11 13:06

Incrementing by....well, certain number... works, but only if you start from an already even number. Important to note that.