getting colors in bitmaps... - C / C++ / MFC Discussion Boards

Ravi Bhavnani17-Oct-04 6:28

17-Oct-04 6:28

See GetSysColor(). On non-XP and non-themed XP systems I think you can use COLOR_3DFACE.

/ravi

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Re: default dialog color?

the_augy17-Oct-04 12:22

the_augy

17-Oct-04 12:22

Exactly what i needed. Thanks =]

Arithmetic Encoding

shiraztk16-Oct-04 20:06

shiraztk

16-Oct-04 20:06

Hi
Could anyone please point to me a good tutorial and source code for C++ implementation for adaptive arithmetic encoding.
I have gone through Nelsons tutorial and few others. The implementation is bit difficult for me to understand.

Thanks in advance

The Best Relligion is Science.
Once you understand it, you will know God.

Re: Arithmetic Encoding

toxcct17-Oct-04 21:49

toxcct

17-Oct-04 21:49

what is arithmetic encoding...?

TOXCCT >>> GEII power

Re: Arithmetic Encoding

shiraztk17-Oct-04 23:16

shiraztk

17-Oct-04 23:16

Hi
Thanks for your interest.
You could go through this link to get a good start.

http://dogma.net/markn/articles/arith/part1.htm

Regards

The Best Relligion is Science.
Once you understand it, you will know God.

TC++PL By Bjarne

Anonymous16-Oct-04 18:37

Anonymous

16-Oct-04 18:37

Does anyone know where to find the solution to the exercise presented in the book, besides the companion book C++ Solutions.

Thanks

Coward

Re: TC++PL By Bjarne

morten4117-Oct-04 6:28

morten41

17-Oct-04 6:28

Hi,

here it is,

http://www.research.att.com/~bs/3rd.html[^]

you can always post your solutions here,
for comments.

// Lord Byte has started to code
void swap(char **p, char **q)
{
char *tmp;

tmp = *p;
*p = *q;
*q = tmp;
}

getting colors in bitmaps...

the_augy16-Oct-04 17:19

the_augy

16-Oct-04 17:19

I'm trying to use CBitmap to manipulate a bitmap, but there's no easy way for me to extract a color from a bitmap (like GetPixel(x, y) in CWnd-derived classes). Is there something I'm missing? Suggestions are well appreciated. Alternatively, is there a way to fill a bitmap with one color like FillRect() does with DCs?

thanks,
augy

Re: getting colors in bitmaps...

Azghar Hussain16-Oct-04 21:42

Azghar Hussain

16-Oct-04 21:42

Hey,
Try this.
CDC *pDC = this->GetDC();
CDC mDC;
mDC.CreateCompatibleDC(pDC);
mDC.LoadBitmap(IDB_BITMAP1);
Now you can used GetPixel() to extract color of bitmap.
mDC.GetPixel(...);
this->ReleaseDC(pDC);

Hope this will work.

If you have faith in the cause and
the means and in God, the hot
Sun will be cool for you.

Re: getting colors in bitmaps...

Christian Graus17-Oct-04 10:52

Christian Graus

17-Oct-04 10:52

To work with a bitmap, you need to select it into a DC. The other way is to use a DIBSEction, then you can access the bits directly. Get/SetPixel are incredibly slow.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

crossword puzzle alogrithm

Mohsen Saad16-Oct-04 13:42

Mohsen Saad

16-Oct-04 13:42

hi,
can any one provide me with an alogrithm to construct crossword puzzles similar to that is found in NYtimes.

vc++ string Find problem

koo916-Oct-04 11:20

koo9

16-Oct-04 11:20

hi all

I got the text from the popupmenu item using GetMenuString like so:

TCHAR itemText[MAX_PATH] = {0};
GetMenuString(m_hList,i,itemText,MAX_PATH,MF_BYPOSITION);

then i try to find if certain sequence is in the itemText like so:

TCHAR strTOSearch[2]="(";

if(_tcsstr(itemText,strToSearch)!=NULL)
{
....
}

now if the strToSearch does not contain any white space, it works fine, but then strToSearch[4]="h h";

then it won't find the string even though itemText does contain "h h",

what am I missing?

thx

koo9

Re: vc++ string Find problem

ryuki16-Oct-04 12:11

ryuki

16-Oct-04 12:11

I did not used TCHAR yet. I did a simple test with strstr() and it worked.

<br />
char tst[50];<br />
strcpy(tst,"Hello you!\nThis works!"); // put a string into tst<br />
if (strstr(tst,"lo y")) // strstr returns NULL if there is no ocurance<br />
	m_output="OK";<br />
<br />
UpdateData(FALSE);<br />

The str-functions are pretty old and are not very object orientated but they don't let you down. I like them. Wink | ;)

Re: vc++ string Find problem

koo916-Oct-04 13:26

koo9

16-Oct-04 13:26

strstr and _tcsstr both works fine in ur case, I guess it's just my itemText from teh GetMenuString call, it's supposed to be LPTSTR, but I use TCHAR, then _tcsstr or strstr will cast it to char * in fact, const unsigned short * in the function, I guess that's why it does work.
but not sure how get cast them correctly.

Re: vc++ string Find problem

ryuki16-Oct-04 21:10

ryuki

16-Oct-04 21:10

The best solution would be to use CString. It has many constructors. For LPCTSTR you can use CString::CString( LPCTSTR lpch, int nLength ) and for searching a substring or a character Value in another String use CString::CString::Find(...). Just check the CString class and you will see. If it still not work than look at the return value of GetMenuString. Maybe it redrives not the whole string (don't think so).

Re: vc++ string Find problem

koo917-Oct-04 6:43

koo9

17-Oct-04 6:43

GetMenuString return the full text, I will give it a try. thx

memory utilization and the minimize box

Marc Clifton16-Oct-04 7:36

Marc Clifton

16-Oct-04 7:36

OK, What's going on here.

I have a C++/MFC application, and happily starts consuming memory slowly. Then when I hit the minimize box on the application, *poof*, all the memory that the application is consuming goes way down. Bring it back up, and it starts munching again slowly, minimize it, and the memory utilization goes down!

What's going on when I minimize an application?

Marc

MyXaml
Advanced Unit Testing

Re: memory utilization and the minimize box

PJ Arends16-Oct-04 7:57

PJ Arends

16-Oct-04 7:57

That appears to be standard behaviour. I just tried it with Windows Task Manager where I watched the memory usage of various apps. Every one of them reduced the memory usage when they were minimized. I do not know what happens to the memory, maybe windows automatically writes it to the swap file, or Task Manager looses track of it?

Whatever it is, I wouldn't worry about it unless your app is somehow loosing data.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: memory utilization and the minimize box

Marc Clifton16-Oct-04 9:30

Marc Clifton

16-Oct-04 9:30

PJ Arends wrote:
That appears to be standard behaviour.

Ah, I'm too sleepy to be working today. Yes, it goes down, but the total commit stays the same. *Whew*

Marc

MyXaml
Advanced Unit Testing

Re: memory utilization and the minimize box

Graham Bradshaw16-Oct-04 14:43

Graham Bradshaw

16-Oct-04 14:43

It's by design. Windows is trimming the working set of the application. See KB article 293215[^] for an explanantion (and some code to prevent it, should that be necessary).

inserting characters in a char*

Anonymous16-Oct-04 5:48

Anonymous

16-Oct-04 5:48

Hello

I have a char * m_Str which is equal to "Test A"

I have another char* Str which is equal to " of"

I want m_Str to be equal to "Test of A"

So I need to put " of" into m_Str beginning in position 4

so my function could look like this:

bool Insert(char * Str, int Index)

where index = 4 and Str = " of"

thanks,

Lino

Re: inserting characters in a char*

toxcct16-Oct-04 6:56

toxcct

16-Oct-04 6:56

you should pass a parameter to the function to know the maximum number of characters the destination buffer can contain.
I submit another way, with CString, but you will be able (i hope) to adapt it to you problem.

<font color=#0000FF>void</font> myClass::Insert (CString Str, <font color=#0000FF>int</font> Index) {
    CString strTmp = m_Str.Left(Index);
    strTmp += Str;
    strTmp += m_Str.Mid(Index);
    m_str = strTmp;
}

TOXCCT >>> GEII power

Re: inserting characters in a char*

lino_i16-Oct-04 15:26

lino_i

16-Oct-04 15:26

it's a char* not a string...and I have to leave it a char* so I don't think you're solution will work.

Re: inserting characters in a char*

Maximilien16-Oct-04 15:42

Maximilien

16-Oct-04 15:42

you have to reconstruct a new char* string.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: inserting characters in a char*

lino_i16-Oct-04 15:51

lino_i

16-Oct-04 15:51

using loops?

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