C / C++ / MFC Discussion Boards

Re: hackers delight, how to parse all compbinations

David Crow4-Apr-06 7:31

David Crow

4-Apr-06 7:31

9ine wrote:
if(!sum) break;

Why are you using a logical NOT operator with a float?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: hackers delight, how to parse all compbinations

9ine4-Apr-06 23:05

9ine

4-Apr-06 23:05

I thought it was not forbidden. why not float value stored as 32 bit number and if it is 0.0 then its 32 bit equivalent 0x00000000

9ine

Re: hackers delight, how to parse all compbinations

David Crow5-Apr-06 4:09

David Crow

5-Apr-06 4:09

9ine wrote:
I thought it was not forbidden.

Just because something is syntactically correct does not also mean it is good practice.

9ine wrote:
why not float value stored as 32 bit number and if it is 0.0...

Using the equality operator with float (or double) is a really bad idea.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

CListCtrl

Anthony98874-Apr-06 4:52

Anthony9887

4-Apr-06 4:52

Hi,

Does anyone know how I can remove the highlight selection in the listview control. I just want to be able to have the user to select the checkboxes.

Thanks.

Re: CListCtrl

David Crow4-Apr-06 4:59

David Crow

4-Apr-06 4:59

Use the SetItem() method to turn off the LVIS_SELECTED state.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: CListCtrl

Laxman Auti4-Apr-06 18:36

Laxman Auti

4-Apr-06 18:36

You can use the following method to modify the state

for removing of selection where

state = 0
nMask = LVS_SELECTED

SetItemState( int nItem, UINT nState, UINT nMask );

Knock out "T" from CAN'T
You 'CAN' if you think you 'CAN'
Cool | :cool:

-- modified at 0:36 Wednesday 5th April, 2006

Where do u declare m_pSet?

swapna_signsin4-Apr-06 4:48

swapna_signsin

4-Apr-06 4:48

Hi,
I've done a dialogbased project and created databases(MSACCESS) using recordset(class wizard).Now my problem is where do u declare this m_pSet?
In SDI u do it in VIEW Class,but in dialogbased where do u do it?

I get the foll errors when I execute the program:
m_pSet :Undeclared identifier

pls help me

swapna_signsin

Re: Where do u declare m_pSet?

toxcct4-Apr-06 4:54

toxcct

4-Apr-06 4:54

i think you are trying to reuse some code you saw somewhere on the web.

i don't know what type is m_pSet, but refering to its name, ,i think it could be a CRecordSet*
and as there is a prepending m_ it means that it is a member of a class.

but tell me where you found your source ??

Re: Where do u declare m_pSet?

swapna_signsin4-Apr-06 5:02

swapna_signsin

4-Apr-06 5:02

hi,
well thats right,it was the method I used in SDI application in which m_pSet gets automatically.It is a recordset.
Actually Iam a beginner to databases and I just wanna connect my database(MSACCESS) with two fields name and grade thru dialogbased.
How do u think I should proceed?

bye

swapna_signsin

Re: Where do u declare m_pSet?

David Crow4-Apr-06 4:57

David Crow

4-Apr-06 4:57

swapna_signsin wrote:
In SDI u do it in VIEW Class,but in dialogbased where do u do it?

Make it a member of the dialog class.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

CSliderCtrl question

Shay Harel4-Apr-06 4:40

Shay Harel

4-Apr-06 4:40

Hi,

I am using a slide control in a dialog and I used Visual studio to create it and place the slider on it.

When I want to add the tick marks, I have a problem. I must use the Create function for that with the "TBS_AUTOTICKS" flag, but the problem is that I can't use the Create function since Visual Studio already did it for me using the macros.

Any way to set this flag or override the Create function macro ?

Shay

Re: CSliderCtrl question

David Crow4-Apr-06 4:46

David Crow

4-Apr-06 4:46

Just check the "Auto ticks" checkbox in the resource editor.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: CSliderCtrl question

Shay Harel4-Apr-06 4:49

Shay Harel

4-Apr-06 4:49

Why couldn't I think about it before Smile | :)

BTW, I am using VS 2003 and it also need the Tick Marks property checked.

Thanks !

map mode problem

snowheavy4-Apr-06 4:29

snowheavy

4-Apr-06 4:29

I use double buffers to draw a rectangle.I add codes in OnPrepareDC() function:

{ CScrollView::OnPrepareDC(pDC, pInfo);

pDC->SetMapMode(MM_ISOTROPIC);
pDC->SetWindowExt(CSize(100,100));
pDC->SetViewportExt(CSize(300,300));

}
In OnDraw() function,I wrote this:pDC->BitBlt(....,&dcmem,0,0,SRCCOPY);
I found that the rectange became lager and thicker than its original state(In its original state, I wrote pDC->SetViewporOrg(CSize(100,100)) in OnPrepareDC
function )The problem is ,when I changed the mapping mode of Memory DC(memDC),that is,I used this code OnPrePareDC(&dcMem),I found that the rectangle's size got larger but the line width couldn't become larger,what's the diffrence?plz help.

Re: map mode problem

bob169724-Apr-06 6:34

bob16972

4-Apr-06 6:34

If your pen width is 0, you will always gets a border or line width of 1 pixel.

(On a side note, MM_ISOTROPIC and double buffers can exhibit rounding errors in the form of streaks and smudging when changing the window and viewport extents. I posted a comment about this in Keith Rule's article in the "Font's and GDI" section of CP. If you drag your "help about" window over your double buffered client area, you will see smudging and/or remnants due to rounding errors. I put a clickety to a helpful link to an (old) Microsoft article that will adapt a solution to your project in that comment.)

multidimensional arrays, dummy question

9ine4-Apr-06 3:46

9ine

4-Apr-06 3:46

how to allocate in loop any given number of dimension for multidimensional array

like static int m_arr[10][20][15][5][] .... [] ... but do it dynamically

9ine

Re: multidimensional arrays, dummy question

toxcct4-Apr-06 3:49

toxcct

4-Apr-06 3:49

you must allocate dimensions one by one...

Re: multidimensional arrays, dummy question

valikac4-Apr-06 6:30

valikac

4-Apr-06 6:30

Another approach, which should simplify this a bit, is a structure with member functions.

Pointer or vector

Kuphryn

Re: multidimensional arrays, dummy question

9ine4-Apr-06 22:58

9ine

4-Apr-06 22:58

I've choosen to store multidimensional indeces of all possible combinations

see my topic hackers delight, ....

9ine

Increase Height of the Status Bar

RockyJames4-Apr-06 3:23

RockyJames

4-Apr-06 3:23

Hi,
Is there any way to Increase the Height of the status Bar?

Re: Increase Height of the Status Bar

toxcct4-Apr-06 4:19

toxcct

4-Apr-06 4:19

don't repost[^]

Re: Increase Height of the Status Bar

ThatsAlok4-Apr-06 6:59

ThatsAlok

4-Apr-06 6:59

RockyJames wrote:
Is there any way to Increase the Height of the status Bar?

you have to subclass the statusbar and implement Subclassed statusbar there

Menus

Aravind Badrinath Krishnan4-Apr-06 3:20

Aravind Badrinath Krishnan

4-Apr-06 3:20

Hi everyone,

I have a doubt regarding setting and getting of menus. I change the menu of my frame using:
pMainFrame->MDISetMenu(ptrToAValidMenuTobeLoaded);(pMainFrame = this is the pointer to my Valid Frame)

But when i say :
CMenu* pSetMenu = AfxGetMainWnd()->GetMenu();(GetMenu function of CWnd class)
iam not getting the menu.(pSetMenu is NULL)

Does MDISetMenu of MDIFrameWnd Class and SetMenu of CWnd class, sets menus at different places?
How can i Get my menu attached with my Main window.(is there any other method of doing the same)

Note:
After my application loads iam able to see that the menu is set properly and iam able to see it also.

Thanks a lot for replies and/or reading the same,

thnx
KAB

WaitCommEvent

LCI4-Apr-06 3:08

LCI

4-Apr-06 3:08

I am trying to use the WaitCommEvent function to listen for a signal coming through pin 6 on an RS232. Before i listen i want to send two signals out on different pins. I can already send the signals succesfully, however, does anyone have an example of using WaitCommEvent to listen for a signal that i can view ?

Re: WaitCommEvent

Ștefan-Mihai MOGA4-Apr-06 3:17

Ștefan-Mihai MOGA

4-Apr-06 3:17

Maybe you'll find an answer to your question on Ashish Dhar's Serial Communication in Windows[^] Good luck!

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