Re: Dividing the bits in a 16 bit short value - C / C++ / MFC Discussion Boards

Re: Compiling a Parser Generator generated file causes linker errors

Bram van Kampen13-Apr-08 3:21

13-Apr-08 3:21

Well,
The functions yywclex(??) and yywcparse(??) have been declared, are being used in the stated modules, but have not been defined. That's why the linker cannot find them. Do a text search for these functions. If you cannot find a definition for them there may be something wrong with your generator. an other possibility is that you were supposed to write those yourself. Check the documentation for YACC. Thirdly, Is there a bug in your rules script, which results in YACC not generating those functions.
It is unlikely that there is something wrong with your linker. Also, because the code is in 'C', errors in type declarations may cause a run time issue, but will not be found by the linker. The functions:
'int f(int)' and 'int f(char,char) are both mangled to '_f' by the compiler.

Hope this helps
Smile | :)

Bram van Kampen

Re: Compiling a Parser Generator generated file causes linker errors

Manfr3d13-Apr-08 9:30

Manfr3d

13-Apr-08 9:30

I solved this problem by rebuilding all the library files which are included.

Now there's just one erroe left, but I don't thnk that this one has something to do with VC++, but with the lexer and parser generator I'm using.

Re: Compiling a Parser Generator generated file causes linker errors

Bram van Kampen13-Apr-08 15:09

Bram van Kampen

13-Apr-08 15:09

Well, at least you're getting a handle on things. Gives a good feeling though, doesn't it.

Regards,
Smile | :)

Bram van Kampen

Dividing the bits in a 16 bit short value

ChemmieBro11-Apr-08 2:28

ChemmieBro

11-Apr-08 2:28

I have a structure:
typedef struct{
unsigned short Id : 8;
unsigned short Name: 8;
unsigned short Length: 11;
unsigned short Value: 5;
} MyStruct;

I also have an array of bytes (unsigned char):

I want to stick that structure into the first four bytes in the array.

Array[0] = MyStruct->Id;
Array[1] = MyStruct->Name;

...then what?

How can I divide the last two values and put them into the [2] and [3] position in the byte array?

Re: Dividing the bits in a 16 bit short value

JudyL_MD11-Apr-08 2:42

JudyL_MD

11-Apr-08 2:42

try a union[^]

Re: Dividing the bits in a 16 bit short value

CPallini11-Apr-08 3:30

CPallini

11-Apr-08 3:30

Please note sizes are identical. Methods

(1) quick & dirty: copy memory

MyStruct m;
unsigned char a[4];
memcpy(a, &m, sizeof(a));

(2) perhaps more elegant: use union

typedef union
{
 MyStruct m;
 unsigned char a[4];
}MyUnion;

MyUnion mu;
unsigned char array[4];
// initialize mu.m.Id, mu.m.Name, mu.m.Length, mu.m.Value 
for (i=0; i<4; i++)
{
 array[i]=mu.a[i];
}

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: Dividing the bits in a 16 bit short value

ChemmieBro11-Apr-08 4:15

ChemmieBro

11-Apr-08 4:15

It looks like the memcpy might work. I didn't really want to go the route of using a Union.

I was actually looking for a method to do this using bit shifting.

Something like...

unsigned char NewChar = MyStruct->Length << 8;

which would put the 8 leftmost bits in Length into the NewChar, which you could put into Array[2];

but then, how do I get the other three bits from Length and merge them with the 5 bits from MyStruct->Value?

I kind of know what I want to do it, but I don't know exactly how, what commands to use or what I'm doing.

Re: Dividing the bits in a 16 bit short value

CPallini11-Apr-08 4:41

CPallini

11-Apr-08 4:41

Just for the academy (since memcpy is more concise and probably faster).

MyStruct m;
unsigned char a[4];
a[2] = (unsigned char) m.Length; // this cuts off the 3 MSB bits.
a[3] = (m.Length >> 8)  | (m.Value << 3);

Re: Dividing the bits in a 16 bit short value

ChemmieBro11-Apr-08 4:48

ChemmieBro

11-Apr-08 4:48

Cool.

That's what I was looking for originally. But the memcpy works.

THANKS!

how to set background color in visual studio 2005 and how to call matlab by MFC/C++??

johndoelee11-Apr-08 1:58

johndoelee

11-Apr-08 1:58

Dear all,

how to set background color in visual studio 2005??
Is it like http://www.tech-archive.net/Archive/VC/microsoft.public.vc.mfc/2005-09/msg00414.html[^]

and

how to call matlab file(e.g filename.m) by MFC/C++??

is it similar to
"::ShellExecute ( NULL, "open","C:\\path\\to\\readme.txt",NULL, NULL, SW_SHOWNORMAL );"?

Thank you very much!!

Cheers,
John

Re: how to set background color in visual studio 2005 and how to call matlab by MFC/C++?? [modified]

Nitheesh George11-Apr-08 4:43

Nitheesh George

11-Apr-08 4:43

"how to set background color ?"

Hi ,

U can handle WM_CTLCOLORDLG to change the background color of the dialog.

In the link u have given, the code is not returning the handle to the new bursh u want to set for the dialog. See what msdn says

"OnCtlColor must return a handle to the brush that is to be used for painting the control background".

In the code u r returning the default brush handle. so that may the problem of not changineg the background color.

and change your code like this

<br />
if(nCtlColor == CTLCOLOR_DLG)<br />
	{<br />
		hbr = CreateSolidBrush(RGB(2,22,222));<br />
	}<br />

thanks

Nitheesh

modified on Friday, April 11, 2008 10:58 AM

Re: how to set background color in visual studio 2005 and how to call matlab by MFC/C++??

johndoelee11-Apr-08 8:30

johndoelee

11-Apr-08 8:30

Dear Nitheesh,

I am still not able to change the background color after I tried the code below. As I'm a beginner of c++, would you please point out the deficit or improper use of code. Thank you very much!

HBRUSH CMyAppView::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CScrollView::OnCtlColor(pDC, pWnd, nCtlColor);

if(nCtlColor == CTLCOLOR_DLG)
{
hbr = CreateSolidBrush(RGB(2,22,222));
}
return hbr;
}

Cheers,
john

Re: how to set background color in visual studio 2005 and how to call matlab by MFC/C++??

Hamid_RT12-Apr-08 5:47

Hamid_RT

12-Apr-08 5:47

You can use ofWM_CTL* for change color of buttons,dialog,static control and....

Adapter Type?

Ajay L D11-Apr-08 0:46

Ajay L D

11-Apr-08 0:46

Hi All,
I am enumerating the network adapters by using the GetAdaptersInfo() API. But, I am not able to distinguish between the ethernet and wireless network as both the adapters are having the type as MIB_IF_TYPE_ETHERNET. Does anyone have an idea?

Thank you,
AJ

Re: Adapter Type?

Gavin Taylor11-Apr-08 1:57

Gavin Taylor

11-Apr-08 1:57

Looking at the documentation on MSDN GetAdaptersInfo( ) doesn't return that much detail and has been superseded by GetAdaptersAddresses[^] as of Windows XP, however even that only looks like it will differentiate between wired and wireless on Vista and not XP.

Gavin Taylor

how Chnage default backgroung color of Title bar

ingoogle10-Apr-08 23:49

ingoogle

10-Apr-08 23:49

Hi all,

I want to change default blue color of title bar for my SDI window.

I tried painting title bar area through OnNcPaint() but Icon, Caption,Buttons gets disappear, on mouse over buttons appear.

help me with some solution

thanks

Re: how Chnage default backgroung color of Title bar

followait11-Apr-08 0:37

followait

11-Apr-08 0:37

SetSysColor<br />
GetSysColor

Hope it helps.

Re: how Chnage default backgroung color of Title bar

ingoogle13-Apr-08 19:58

ingoogle

13-Apr-08 19:58

Yes it helps for system windows..

in my SDI appln,

CWnd* pWnd = CMainFrame::GetActiveWindow();

pWnd-> doesnt have setsyscolor or getsyscolor.

how could i get these functions to my CMainframe (constructor or create)

i NEED TO CHANGE ACTIVECAPTION/INACTIVECAPTION Colors.

thanks

Re: how Chnage default backgroung color of Title bar

followait13-Apr-08 22:55

followait

13-Apr-08 22:55

It's a api function, just call ::GetSysColor/::SetSysColor.
Use parameters like:

COLOR_GRADIENTACTIVECAPTION<br />
COLOR_GRADIENTINACTIVECAPTION

Re: how Chnage default backgroung color of Title bar

Maximilien11-Apr-08 2:17

Maximilien

11-Apr-08 2:17

AFAIK, if you handle OnNcPaint, you need to do everything (redraw everything )

(but I might be wrong).

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: how Chnage default backgroung color of Title bar

ingoogle13-Apr-08 20:07

ingoogle

13-Apr-08 20:07

u r right ..if i handle NCPAINT i got to redraw each and evrything in title bar on my own.
Instead iam looking for some solution from which i can change color of Title bar without disturbing caption text,icon,standard buttons.

Re: how Chnage default backgroung color of Title bar

Hamid_RT12-Apr-08 5:46

Hamid_RT

12-Apr-08 5:46

Did you search on the codeproject it has good articles.

Re: how Chnage default backgroung color of Title bar

ingoogle13-Apr-08 20:02

ingoogle

13-Apr-08 20:02

yes i searched through and got one MDI application who does exactly what i wanted but he paints customised title bar on exhisting default bar by using subclass technique by Paul DiLascia(MS journal).

my client doesnt allow me to add custom class for this kind of need.

Create a button whose id is ID_FILE_NEW, not be processed by CWinApp::OnFileNew

followait10-Apr-08 23:39

followait

10-Apr-08 23:39

SDI, can't CMyApp::OnFileNew handle the the click message by the button?

int CMyView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
  ...
  m_btnNew.Create(NULL,style,rcDummy,this,ID_FILE_NEW);
  m_btnNew.LoadBitmaps(IDB_NEW,IDB_NEW_DOWN);
}

Re: Create a button whose id is ID_FILE_NEW, not be processed by CWinApp::OnFileNew

Nitheesh George11-Apr-08 2:03

Nitheesh George

11-Apr-08 2:03

Hi,
have you mapped the WM_COMMAND to CWinApp::OnFileNew.?

thanks

Nitheesh

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.