negative values for char - C / C++ / MFC Discussion Boards

Re: How to draw a bitmap on top of button?

prasad_som22-Feb-07 2:37

prasad_som

22-Feb-07 2:37

Naveen R wrote:
I never said to create another CPaintDC below the CButton::OnPaint();

Yes, but it is what should be used in OnPaint messages.
CClientDC associated with whole client area of window, as opposed to CPaintDC which is associated to invalidated rect only.
So consider how logical is it to use CClientDC there.

BTW,havn't you come across this line whenever added WM_PAINT message handler throught class wizard ?
// Do not call CButton::OnPaint() for painting messages

Prasad
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Re: How to draw a bitmap on top of button?

prasad_som21-Feb-07 1:53

prasad_som

21-Feb-07 1:53

Igor Jerosimic wrote:
OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);

As told by Navin, you need to do all drawing stuff in case of owner drawn controls.
And should not call base version, as this function is supposed to override in derived control.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: How to draw a bitmap on top of button?

David Crow21-Feb-07 3:23

David Crow

21-Feb-07 3:23

Have you see this?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: How to draw a bitmap on top of button?

Hamid_RT21-Feb-07 5:27

Hamid_RT

21-Feb-07 5:27

See A Better Bitmap Button Class[^] if helpfuls

WhiteSky

Re: How to draw a bitmap on top of button?

ThatsAlok21-Feb-07 6:24

ThatsAlok

21-Feb-07 6:24

WhiteSky wrote:
See A Better Bitmap Button Class[^] if helpfuls

i liked it sometime before

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Re: How to draw a bitmap on top of button?

Igor Jerosimic21-Feb-07 23:42

Igor Jerosimic

21-Feb-07 23:42

OK thank you all for your answers, i will try it out and let you know if it's woking.

In case my english is so bad that nobody understood what i want to do Smile | :)

, I want to draw something like this
http://img252.imageshack.us/img252/2254/codeprojectkc1.png

Re: How to draw a bitmap on top of button?

Igor Jerosimic26-Feb-07 0:28

Igor Jerosimic

26-Feb-07 0:28

CImageButton class is very lousy way of replacing API function DrawFrameControl and i definitely don't need that...
All that code is easily replaced with these 4 lines of code:
CPaintDC dc(this);
CRect rc;
GetClientRect(&rc);
dc.DrawFrameControl(&rc, DFC_BUTTON, DFCS_BUTTONPUSH);

http://img214.imageshack.us/img214/6206/drawingfx6.png

negative values for char

micutzu21-Feb-07 0:34

micutzu

21-Feb-07 0:34

Hello,

I have the following situation:

Input is char *buf (which is the content of a web page).

I have the following code

char v; <br />
for (i=0; i<strlen(buf); i++)<br />
   {<br />
 	 v = buf[i]; <br />
   }

I get a negative v if the page has Greek characters I get negative values for v. Something like v=-50. Is there any method to get the character behind -50 ?

Thanks.

Re: negative values for char

James R. Twine21-Feb-07 1:21

James R. Twine

21-Feb-07 1:21

   Sounds like you should be scraping the content of the page as Unicode (wide chars, wchar_t) instead of ANSI (narrow chars, char).

   The standard ASCII table, which you are really using like-it-or-not when dealing with char types, does not have a lot of extended characters in it, and the ones it has can be treated differently by different systems. For example, -50 is 0xCE, which can be Î or ╬, or some other character...

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
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Re: negative values for char

micutzu21-Feb-07 1:28

micutzu

21-Feb-07 1:28

Thanks for the reply. The whole application is developed around ANSI and changing everyting looks like not such a good idea. I was wandering if there is any mechanism to determine the “real character” behind -50. If I know that the real character is a greek character I can convert it into a html entity for example and I can get something like %u03C.

Re: negative values for char

Naveen21-Feb-07 2:13

Naveen

21-Feb-07 2:13

I dont know you checked my post or not...but this will work..isnt it?

CString cstext = L"03C5";
wchar_t Greek;
int nChar;
swscanf( cstext, L"%x", &nChar );
Greek = nChar;

nave

Re: negative values for char

micutzu21-Feb-07 2:32

micutzu

21-Feb-07 2:32

I did . Thanks.
I do not use CString (not using MFC). Your solution works but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

Re: negative values for char

Naveen21-Feb-07 2:43

Naveen

21-Feb-07 2:43

why cant you try printing it out to console..?

wprintf( L"%c", pGreek );

nave

Re: negative values for char

micutzu21-Feb-07 3:00

micutzu

21-Feb-07 3:00

I did.

printf("%c\n", c);
wprintf( L"%c", c );

Both print the same character which is not the correct one ┼ (this is printed instead of Π)

Re: negative values for char

Naveen21-Feb-07 16:14

Naveen

21-Feb-07 16:14

micutzu wrote:
wprintf( L"%c", c );

if 'c' is of type wchar_t then you must specify like this.

wprintf( L"%c", &c );

nave

Re: negative values for char

Nemanja Trifunovic21-Feb-07 4:00

Nemanja Trifunovic

21-Feb-07 4:00

micutzu wrote:
but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

That entirely depends on the text encoding. Which charset is the webpage you are working with? If it is Windows CP 1253 (Greek), you can find out by setting the codepage of your console window to 1253 and then printing it out. For -50 (ie 206 in unsigned form) it should be greek capital XI: Ξ

Programming Blog
utf8-cpp

Re: negative values for char

toxcct21-Feb-07 2:33

toxcct

21-Feb-07 2:33

Naveen R wrote:
CString cstext = L"03C5";

naveen, be careful, write this :

CStringW cstext = L"03C5";

CString cstext = _T("03C5");

but don't mix the two styles.
apparently, you're using wide characters in all the rest of your code, so i'd say use the former...

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Re: negative values for char

Naveen21-Feb-07 2:45

Naveen

21-Feb-07 2:45

but CString have both constructors

CString(LPCWSTR lpsz)
CString(LPCSTR lpsz)

Any way I did so because he said( in his previous post) his project is UNICODE define...

nave

Re: negative values for char

toxcct21-Feb-07 2:52

toxcct

21-Feb-07 2:52

Naveen R wrote:
but CString have both constructors

this is not acceptable argument, because, if the application is not defining UNICODE macro, even if you initialize your CString with a LPCWSTR, the string will be casted into ANSI string.

BTW, i doubt of this information. actually, CString gets a LPCTSTR, which is transformed into LPCSTR or LPCWSTR depending on unicode definition

Naveen R wrote:
Any way I did so because he said( in his previous post) his project is UNICODE define...

yes, but then prefer using CStringW. imagine the case when someone else has to maintain the application, or develop the dual possibility of having the application running both ansi and unicode... your code must be flexible, not only "aware"

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Re: negative values for char

Naveen21-Feb-07 16:08

Naveen

21-Feb-07 16:08

toxcct wrote:
if the application is not defining UNICODE macro, even if you initialize your CString with a LPCWSTR, the string will be casted into ANSI string.

Even if UNICODE is defined, I am expecting only ANSI characters in that statement.

toxcct wrote:
yes, but then prefer using CStringW

Whats is this CStringW? I didnt find any such class in vc6. I havent worked in later verions of visual studio. Is it a new class added to the MFC in later verions of visual studio?

nave

Re: negative values for char

kakan21-Feb-07 1:41

kakan

21-Feb-07 1:41

char is a signed data type.

You have to use unsigned char in order to get the character values above 127 (decimal) right, such as:

unsigned char v; 
for (i=0; i {
  v = (unsigned char) buf[i]; 
}

There is a compiler option (/J ?) that defaults char to be unsigned.

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Re: negative values for char

Nemanja Trifunovic21-Feb-07 1:58

Nemanja Trifunovic

21-Feb-07 1:58

If you just want char to be unsigned, set the compiler option /J.

Programming Blog
utf8-cpp

How to make a combo box readonly?

reza matinnejad21-Feb-07 0:10

reza matinnejad

21-Feb-07 0:10

How could i make a Combo box readonly(user can not write in the combo box) in design time? How could i make a Combo box readonly(user can not write in the combo box) in run time?

Re: How to make a combo box readonly?

Garth J Lancaster21-Feb-07 0:17

Garth J Lancaster

21-Feb-07 0:17

you obviously didnt search/look around CP very hard .. try this http://www.codeproject.com/combobox/readonlycombo.asp[^]

Re: How to make a combo box readonly?

reza matinnejad21-Feb-07 0:21

reza matinnejad

21-Feb-07 0:21

Thanks

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