Re: get keyboard events - C / C++ / MFC Discussion Boards

jimNLX20-Feb-03 4:35

20-Feb-03 4:35

What is it about the slider control that it wants to stay in the last place it was at on a window. I close the window and when I go back even thought I do a SetPos(0) it is still hanging around the last place it was left.

Any ideas on how to make it move back?

Thanks,

Jim

Re: Slider control

valikac20-Feb-03 7:32

valikac

20-Feb-03 7:32

Recheck your code. Otherwise, call Invalidate().

Kuphryn

Deriving MFC Class for DLL, instantiating in Visual Basic

DigitalSabre20-Feb-03 4:31

DigitalSabre

20-Feb-03 4:31

Not like I want a new control or anything. I just want to Derive the CAsyncSocket class in a DLL. Then I want to override the virtual members (all the "on..." functions) and add some of my own, like pre-parse buffers and such.

My purpose is to load the DLL in Visual Basic. It seems a heck of a lot more work, in the long run, to write and existing object and a new object for each other, instead of writing one that I can use in place of the two.

What do I need to do (#include, list in compile command-line, etc.) to make it compile properly as a DLL.

Then, how do I instantiate one in VB so I can go about using it?

--M.Pemrich

----------------------------------------------------
Just kinda lost everywhere. And as if lost wasn't lost
enough... I got a book on the subject...

Re: Deriving MFC Class for DLL, instantiating in Visual Basic

Anna-Jayne Metcalfe20-Feb-03 4:53

Anna-Jayne Metcalfe

20-Feb-03 4:53

Somebody out there may well correct me, but I don't think you can call a conventional C++ class from VB without cracking the mangled names and passing the this pointer across.

However it's not all bad news. .NET allows you do use (and inherit) classes across threade boundaries, so you can quite happily use a C# class derived from an MC++ class in a VB.NET app. Cool | :cool:

Chris Maunder wrote an article on the subject you might find of interest:

Cross language inheritance in .NET[^]

Anna Rose | [Rose]

www.annasplace.me.uk

"Be yourself - not what others think you should be"
- Marcia Graesch

Trouble with resource IDs? Try the Resource ID Organiser Add-In for Visual C++

get keyboard events

Willem B20-Feb-03 4:21

Willem B

20-Feb-03 4:21

hi,

maybe a dumbquestion... OMG | :OMG:

i want to know wenn a key is pressed in my dialog and witch key is pressed. how do i do it?

thanks in advanced...

Willem

[]D [] []D []

Re: get keyboard events

Michael Shuster20-Feb-03 4:50

Michael Shuster

20-Feb-03 4:50

If you go into the Class Wizard under the message maps tab you can select WM_KEYDOWN or WM_KEYUP from the messages section. Once selected add a function to the event and edit the code in the function. The function takes in a parmeter called nChar.

convert nChar to a regualr character by using something like

char myChar;<br />
myChar = char(nChar);

then to find what key was pressed you can do simple comparisons like

if (myChar =='A')<br />
{<br />
}

Michael Shuster

Good Judgement comes from experience; Experience comes from bad judgement.

Re: get keyboard events

HENDRIK R20-Feb-03 4:52

HENDRIK R

20-Feb-03 4:52

tracking WM_KEYDOWN should do it. There's much information about it on MSDN.

Re: get keyboard events

Willem B20-Feb-03 21:11

Willem B

20-Feb-03 21:11

Hi, if tried it and it didn't work, maybe i should add that i want to override the input of inputbox to make my user interfase more keyboard-based.

[]D [] []D []

Getting focus for modeless dialogs in a controlbar.

Maximilien20-Feb-03 4:17

Maximilien

20-Feb-03 4:17

Howdy'

I have a UI with a ControlBar ( CSizingControlBar ) that contains a dialog and sub dialogs ( panels ).

The Panels need to be aware when they get the focus.

I tried handling WM_SETFOCUS, WM_ACTIVATE and WM_NCACTIVATE, and I don't receive the messages.

I now handle WM_LBUTTONDOWN to "simulate" the wanted behaviour, but I don't like it, and wandered if I'm missing something ?

Thanks.

Maximilien Lincourt
For success one must aquire one's self

Prob converting Hex to CString

afender20-Feb-03 4:14

afender

20-Feb-03 4:14

CString m_test;
sBuffer[2] = "\xE8";

m_test.Format("0x%x", sBuffer[0]);

when i display on the edit box, i get this output

0xffffffe8

it looks like it sign extend the value, any other way to solve it so that i can get 0xe8 instead of 0xffffffe8

regards

afender

Re: Prob converting Hex to CString

Ryan_Roberts20-Feb-03 4:26

Ryan_Roberts

20-Feb-03 4:26

m_test.Format("0x%02x",sBuffer[0]) could work. Haven't used a CString for a while though.

Have a look at boost::format at http://www.boost.org[^] if you like your type safety.

Ryan

They read good books, and quote, but never learn
a language other than the scream of rocket-burn.
Our straighter talk is drowned but ironclad;
elections, money, empire, oil and Dad.

Re: Prob converting Hex to CString

afender20-Feb-03 5:26

afender

20-Feb-03 5:26

it still not working, seems like i cant limit the field width
Frown | :(

Re: Prob converting Hex to CString

David Chamberlain20-Feb-03 6:05

David Chamberlain

20-Feb-03 6:05

afender wrote:
sBuffer[2] = "\xE8";

I've had problems like this before, too. It appears that your literal string is actually 4 characters long: slash, x, E, and 8.

Using the format string "0x%02x" will give you a two-character field with an automatic leading zero, if the source value ends up having only one char.

This DOES work, so if your's doesn't, there there is something else wrong.

Dave

"You can say that again." -- Dept. of Redundancy Dept.

Re: Prob converting Hex to CString

Ted Ferenc20-Feb-03 6:16

Ted Ferenc

20-Feb-03 6:16

int nVal = 0xffffffe8;<br />
strBuffer.Format("0x%x", nVal & 0xFF);

As far as I am aware fromatting will no truncate the value, it it was:-

BYTE nVal = 0xe8:

It would format as you wanted it.

If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676

Re: Prob converting Hex to CString

Michael Dunn20-Feb-03 7:23

Michael Dunn

20-Feb-03 7:23

The %x format takes an unsigned int, not a char, so Format() is reading 4 bytes off the stack when you only passed 1 byte of parameters.
Change it to

m_test.Format("0x%x", (unsigned) sBuffer[0]);

And to be extra-spiffy, you can use %#x to automatically add the 0x prefix. Cool | :cool:

--Mike--
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Re: Prob converting Hex to CString

afender20-Feb-03 20:15

afender

20-Feb-03 20:15

hei thks for a ll the helps!

i solve the problem!!

Big Grin | :-D

Drawing icons on a toolbar

Ron Olson20-Feb-03 4:02

Ron Olson

20-Feb-03 4:02

Hi all-

I'm completely stuck. I am trying to dynamically set buttons on a CToolbar object using SetBitmap() via a memory dc. The code I have is below:

// begin code block
void CBitmap_toolbar2View::OnInitialUpdate()
{
CWindowDC dc(this);
CDC memdc;
memdc.CreateCompatibleDC(&dc);

CBitmap bm;
VERIFY(bm.LoadBitmap(IDR_MAINFRAME));
CBitmap *poldbm = memdc.SelectObject(&bm);

// draw into the dc/bitmap
CBrush brush;
brush.CreateSysColorBrush(COLOR_BTNFACE);
HICON theIcon = (HICON)LoadImage(AfxGetInstanceHandle(),
MAKEINTRESOURCE(IDI_ENTRY), IMAGE_ICON, 0,
0,
LR_DEFAULTCOLOR);
VERIFY(::DrawIconEx(memdc,
0,
0, // dc, x, y
theIcon, // HICON (first small one)
GetSystemMetrics(SM_CXICON), // cx
GetSystemMetrics(SM_CYICON), // cy
0,
brush,
DI_NORMAL)); // frame, brush, flags

DestroyIcon(theIcon);

theIcon = (HICON)LoadImage(AfxGetInstanceHandle(),
MAKEINTRESOURCE(IDI_ORDER),
IMAGE_ICON,
0,
0,
LR_DEFAULTCOLOR);

VERIFY(::DrawIconEx(memdc,
32,
0, // dc, x, y
theIcon, // HICON (first small one)
GetSystemMetrics(SM_CXICON), // cx
GetSystemMetrics(SM_CYICON), // cy
0,
brush,
DI_NORMAL)); // frame, brush, flags

memdc.SelectObject(poldbm);
((CMainFrame*)GetParentFrame())->m_wndToolBar.SetBitmap((HBITMAP)bm.Detach());
((CMainFrame*)GetParentFrame())->m_wndToolBar.Invalidate(TRUE);
((CMainFrame*)GetParentFrame())->m_wndToolBar.SetButtons(NULL,2);
}
//// end of code block

I made the toolbar in the frame public just to make it easier to play with.

So I have two icons that I want to set on the toolbar. The two calls to DrawIconEx() sets the first icon at 0,0 and the second one at 32,0 but what I see is the first icon twice. I have zero clue as to why I should see the first icon twice, especially when I call DestroyIcon() between DrawIconEx() and LoadImage() for the second icon.

Any help would be appreciated, this is something of a showstopper and I have no way of getting around it right now. Frown | :(

Ron

Re: Drawing icons on a toolbar

Steve S21-Feb-03 1:56

Steve S

21-Feb-03 1:56

Why don't you use a regular toolbar bitmap strip?

Steve S
[This signature space available for rent]

Re: Drawing icons on a toolbar

Ron Olson21-Feb-03 9:32

Ron Olson

21-Feb-03 9:32

The problem is that the toolbar is variable....the buttons that would appear in the toolbar, as well as their order, are variable. In addition, I already have several dozen ico files which would all have to be mushed together into one big bitmap.

Sorting a vector with structs

whofmans20-Feb-03 3:54

whofmans

20-Feb-03 3:54

Hello,

I would like to sort a vector(vlines), this is a vector with struct's(line).
I want to sort the vector on name and on length.

struct line{<br />
CString name;<br />
double length;<br />
};<br />
<br />
vector<line> vlines;

I know there is a function sort and that it uses a predikaat function.

<br />
std::sort(vlines.begin(), vlines.end(), length<line>());<br />
std::sort(vlines.begin(), vlines.end(), name<line>());<br />

But how can i code the predikaat function's? or template's?? Confused | :confused:

I hope someone can help me?

Thanks

Re: Sorting a vector with structs

Joaquín M López Muñoz20-Feb-03 6:33

Joaquín M López Muñoz

20-Feb-03 6:33

Those predicates are anything (functions, objects) that can be called with the same syntax as a function. So, even a function can do; for instance:

inline bool compare_line_by_length(const line&x,const line& y)
{
  return x.name<y.name;
}

can be fed to std::sort like this:

std::sort(vlines.begin(), vlines.end(), compare_line_by_length);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Cancel Buton On PropertySheet

Mr Bose Dayala20-Feb-03 3:24

Mr Bose Dayala

20-Feb-03 3:24

Hi,
How can I remove OK and Cancel buttons from my PropertySheet to add only Close button???can u plz respond immediately??

thanks in advance

ThomasKennedyBose

Re: Cancel Buton On PropertySheet

Ted Ferenc20-Feb-03 3:50

Ted Ferenc

20-Feb-03 3:50

http://www.codeproject.com/property/hacking_the_cpropertyshee.asp[^]

If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676

Re: Cancel Buton On PropertySheet

Mr Bose Dayala20-Feb-03 4:02

Mr Bose Dayala

20-Feb-03 4:02

Hi.....Its Great.....thanks a lot...thanks for your immediate response

ThomasKennedyBose

hpgl

bachan20-Feb-03 3:18

bachan

20-Feb-03 3:18

could anyone give me help on sending data to a fly pen plotter, how to use hpgl for the same ..any help article link would also do..

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