C / C++ / MFC Discussion Boards

Dr.Walt Fair, PE5-Jun-10 17:54

5-Jun-10 17:54

csrss wrote:
Javascript parsing in c++ - out of curiosity, would you interpret the very first word of such kind of title and send me to web development section yet again?

No, I would suggest you do a google or bing for "jsgen" and see if that helps any.

Sorry, but I still don't see what your question has to do with C / C++ /MFC. It looks to me to be about how javascript should be parsed and/or interpreted.

My apologies if I'm just too dense to understand.

CQ de W5ALT

Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software

Re: messin with javascript

David Crow7-Jun-10 4:25

David Crow

7-Jun-10 4:25

csrss wrote:
Is it the right way?

Snce it is your project and your code, only you can answer this for sure. Does it produce the desired result? If so, then it likely is right. Otherwise, post actual code and specific questions to get more help.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

LoadLibrary() loads a driver ?!

Green Fuze4-Jun-10 14:17

Green Fuze

4-Jun-10 14:17

Hey everybody,

I was wondering...
If winspool.drv is a driver (how can I be sure, it is not .sys, but I've been told it is a driver),
than how LoadLibrary() loads a driver ?!?!?! does it make any sense ?!

Thanks!

Re: LoadLibrary() loads a driver ?!

Randor 4-Jun-10 17:15

Randor

4-Jun-10 17:15

Hi Green,

The question was probably more appropriate for the hardware and devices forum so I gave an answer to your previous question.

The Difference between DRV and SYS extensions[^]

Best Wishes,
-David Delaune

Re: LoadLibrary() loads a driver ?!

Green Fuze4-Jun-10 20:31

Green Fuze

4-Jun-10 20:31

Thanks

vector class memory usage [modified]

James_7224-Jun-10 7:06

James_722

4-Jun-10 7:06

I am just wondering if this:

class Vector
{
public:
   float x,y,z;
};
Vector v;

differs from this:

class Vector
{
public:
   float x,y,z;
   void Cross(Vector, Vector);
   void Dot(Vector, Vector);
   void Normalize();
   //etc.....
};
Vector v;

in terms of performance.

modified on Friday, June 4, 2010 1:56 PM

Re: vector class memory usage

Cedric Moonen4-Jun-10 7:45

Cedric Moonen

4-Jun-10 7:45

What do you mean by "performances" ? If you mean memory size (which I guess you mean because speed is irrelevant here): there's little difference between the two. The methods of a class are in fact not contained in each instance of the class (which means that if you instantiate 10.000 classes, the methods in the class won't have a big impact on the memory consumption).
Does that answer your question ?

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: vector class memory usage

Maximilien4-Jun-10 8:32

Maximilien

4-Jun-10 8:32

what's the question ?

performance is dependant on a whole lot of different factors!

memory usage ? computation speed ?

AFAIK, adding member function to a class does not really impact on performance.

Watched code never compiles.

Re: vector class memory usage

Aescleal4-Jun-10 10:34

Aescleal

4-Jun-10 10:34

If you mean does implementing operations on a class as member functions add any overhead to the time it takes to execute those operations compared to an equivalent global function then the answer is no.

If you use virtual functions then there's a bit of additional overhead but it's pretty minimal compared to dividing two floating point numbers.

Cheers,

Ash

Write Specific File Properties [Solved]

jlangholzj4-Jun-10 5:46

jlangholzj

4-Jun-10 5:46

Hey all,

the project I'm currently working on at one point generates several files with specific information in them. What I want to try and do is wrtie to the file properties after generating that file.

ie, right click on a (.txt) file -> properties -> summary

I want to be able to write to the author, keyword....etc... fields listed in that tab. I'm guessing that this can be done with a strig??? but I don't know if there's a MSDS function that allows for this or the proper way to access the information. All of this information (author, keywords and comments) is already stored in structs and arrays. I also already have access to the address of its base location.

idears?

obtw, looks like a good forum, looking for a good response from the first post Wink | ;)

modified on Friday, June 4, 2010 12:09 PM

Re: Write Specific File Properties

Nuri Ismail4-Jun-10 5:57

Nuri Ismail

4-Jun-10 5:57

This[^] CodeProject article could be very useful for you. Smile | :)

Re: Write Specific File Properties

jlangholzj4-Jun-10 6:09

jlangholzj

4-Jun-10 6:09

litteraly just found that. Sorry and thanks!

ReadOnly Radio button

Anu_Bala3-Jun-10 20:35

Anu_Bala

3-Jun-10 20:35

Hi, im using Radio button to display status of state.
Like State0,State1,State2...
But,user should not click the radio button.
So i make all radio button to disabled,but its look in dull and white colr.
I dont want that.
How can i get that feature ?

Anu

Re: ReadOnly Radio button

Niklas L3-Jun-10 22:02

Niklas L

3-Jun-10 22:02

Well, there is a point in keeping a disabled control looking disabled.
That said, you can handle WM_LBUTTONDOWN in your radio buttons and short-circuit the click from the user.

Edit: Language

home

Re: ReadOnly Radio button

Code-o-mat3-Jun-10 22:22

Code-o-mat

3-Jun-10 22:22

Hey.

Was my first thought too but as it seems, WM_LBUTTONDOWN alone isn't enough since the user can also use the keyboard to tab to the control and then hit SPACE to check it. It helps somewhat if you remove the WS_TABSTOP style but then he can still doubleclick the radio (WM_LBUTTONDBLCLK) which magically sets the focus on the radio and again, he can use SPACE to check it...
Imho the best thing is to also handle some other messages, see here[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

Re: ReadOnly Radio button

Code-o-mat3-Jun-10 22:12

Code-o-mat

3-Jun-10 22:12

Create your own CButton class, in it, handle the following messages:
WM_LBUTTONDOWN -> void OnLButtonDown(UINT nFlags, CPoint point)
WM_LBUTTONUP -> void OnLButtonUp(UINT nFlags, CPoint point)
WM_LBUTTONDBLCLK -> void OnLButtonDblClk(UINT nFlags, CPoint point)
WM_KEYDOWN -> void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
WM_KEYUP -> void OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags)
WM_CHAR -> void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
In each of these functions, do nothing, don't call the super versions either. Don't know how failsafe it is, but seems to be working for me. Good luck.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

Re: ReadOnly Radio button

Niklas L3-Jun-10 22:21

Niklas L

3-Jun-10 22:21

Ah! Forgot about the keyboard. I always do Smile | :)

home

Re: ReadOnly Radio button

Code-o-mat3-Jun-10 22:23

Code-o-mat

3-Jun-10 22:23

Haha, we just "cross-posted[^]" each other. Big Grin | :-D

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

Re: ReadOnly Radio button

Niklas L3-Jun-10 22:35

Niklas L

3-Jun-10 22:35

home

Re: ReadOnly Radio button

Anu_Bala3-Jun-10 22:38

Anu_Bala

3-Jun-10 22:38

Ofcourse im using all this functionalities in that dialog class for someother features.

Anu

Re: ReadOnly Radio button

Code-o-mat3-Jun-10 22:47

Code-o-mat

3-Jun-10 22:47

Pardon?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

Re: ReadOnly Radio button

Anu_Bala3-Jun-10 23:51

Anu_Bala

3-Jun-10 23:51

In that dialog class..Im using mouse lcick functional;ities and Key up and down functionalites to get another function like to invoke another view by mouse clcik or short cut key.
But i dont know how to stop to enter(click value of radio button) in dialog .

Anu

Re: ReadOnly Radio button

Code-o-mat4-Jun-10 0:08

Code-o-mat

4-Jun-10 0:08

Derive a class from CButton, handle those messages in this derived class and use it for your radio.
Something like this:

CReadOnlyRadio: public CButton
{
public:
  DECLARE_MESSAGE_MAP()
  void OnLButtonDown(UINT nFlags, CPoint point) { /*Nothing here on purpose*/ }
  void OnLButtonUp(UINT nFlags, CPoint point) { /*Nothing here on purpose*/ }
  void OnLButtonDblClk(UINT nFlags, CPoint point) { /*Nothing here on purpose*/ }
  void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) { /*Nothing here on purpose*/ }
  void OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) { /*Nothing here on purpose*/ }
  void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) { /*Nothing here on purpose*/ }
};
...
BEGIN_MESSAGE_MAP(CReadOnlyRadio, CButton)
  ON_WM_LBUTTONDOWN()
  ON_WM_LBUTTONUP()
  ON_WM_LBUTTONDBLCLK()
  ON_WM_KEYDOWN()
  ON_WM_KEYUP()
  ON_WM_CHAR()
END_MESSAGE_MAP()
...
class CMyFancyDialog: public CDialog
{
 ...
 DoDataExchange(CDataExchange* pDX);
 CReadOnlyRadio  m_ReadOnlyRadio;
 ...
};
...
void CMyFancyDialog::DoDataExchange(CDataExchange* pDX)
{
  CDialog::DoDataExchange(pDX);
  ...
  DDX_Control(pDX, IDC_READONLY_RADIO, m_ReadOnlyRadio);
  ...
}
...

Hope it is understandable...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

Re: ReadOnly Radio button

Rick York4-Jun-10 8:11

Rick York

4-Jun-10 8:11

The only issue is you probably don't want to declare the member variable in the constructor. That should be in the header file for the class or, in this case, where you have all of those empty methods.

Re: ReadOnly Radio button

Code-o-mat4-Jun-10 9:12

Code-o-mat

4-Jun-10 9:12

Declare the variable in the constructor? What do you mean?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Computers are evil, EVIL i tell you!! <

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