Re: intializing sd array [modified] - C / C++ / MFC Discussion Boards

Re: delete a directory

Hamid_RT15-Feb-07 7:07

Hamid_RT

15-Feb-07 7:07

Or _rmdir

WhiteSky

Image Processing

Raj220315-Feb-07 5:00

Raj2203

15-Feb-07 5:00

How does one open a Bitmap image. I am working on the VC++ platform for my project

Re: Image Processing

toxcct15-Feb-07 5:04

toxcct

15-Feb-07 5:04

give more details about wat you already have please

have you search for some examples at first ?

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Re: Image Processing

Maximilien15-Feb-07 5:51

Maximilien

15-Feb-07 5:51

what about LoadImage ?

with something like ?

HBITMAP hBitmap = (HBITMAP)::LoadImage(NULL, sFileName, IMAGE_BITMAP,
      0, 0, LR_LOADFROMFILE | LR_DEFAULTSIZE | LR_CREATEDIBSECTION);

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Image Processing

Raj220317-Feb-07 7:30

Raj2203

17-Feb-07 7:30

Yes, dats wat i wanted.
Sorry, couldnt specify details.
Need to load bitmaps, calculate pixels n colors...
Wat wud be the best model for colors, preferably, ARGB?

Re: Image Processing

Hamid_RT15-Feb-07 7:07

Hamid_RT

15-Feb-07 7:07

And see CImage class if you want to open other formats

WhiteSky

intializing 2d array

ikbahrian15-Feb-07 5:00

ikbahrian

15-Feb-07 5:00

could anyone plz tell me how can i intialized

unsigned short int test_array[256][256] to zero or empty

Thanks!

Re: intializing sd array [modified]

toxcct15-Feb-07 5:03

toxcct

15-Feb-07 5:03

Brutal method:

for (int i = 0; i < 256; i++) {
    for (int j = 0; j < 256; j++) {
        test_array[i][j] = 0;
    }
}

wiser one:

::memset(test_array, 0, sizeof(unsigned short int)*256*256);

[edit]
-- modified at 12:08 Thursday 15th February, 2007
Better one:

unsigned short int test_array[256][256] = {0};

thanks David
[/edit]

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Re: intializing sd array

David Crow15-Feb-07 5:30

David Crow

15-Feb-07 5:30

toxcct wrote:
wiser one:

::memset(test_array, 0, sizeof(int)*256*256);

Which would actually not be very wise as an int is twice as large as an unsigned short.

memset(test_array, 0, sizeof(test_array));

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

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

Re: intializing sd array

toxcct15-Feb-07 5:32

toxcct

15-Feb-07 5:32

i'm really confused, i read int at first, not unsigned short int Blush | :O

by the way, i prefer writing the explicit

sizeof(unsigned short int)*256*256

instead of

sizeof(test_array)

because i find it more clear in the reader's mind.
of course, if the array change of type, my code must be adapted, not yours.

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Re: intializing sd array

ikbahrian15-Feb-07 5:31

ikbahrian

15-Feb-07 5:31

::memset(test_array, 0, sizeof(int)*256*256);
thanks but how can be done in C langauge.

Re: intializing sd array

toxcct15-Feb-07 5:33

toxcct

15-Feb-07 5:33

firstly, check the code, it's been modified (with unsigned short int instead of int in the sizeof())

secondly, the code is quite C. remove :: before the memset, and all the remaining is C code.

don't forget however to #include <stdlib.h>

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Re: intializing sd array

Gary R. Wheeler17-Feb-07 3:58

Gary R. Wheeler

17-Feb-07 3:58

unsigned short int test_array[256][256] = { 0 };
//...
memset(test_array,0,sizeof(test_array));

If you need to clear the array sometime after it's definition.

Software Zen: delete this;

Fold With Us![^]

Re: intializing sd array

toxcct17-Feb-07 6:29

toxcct

17-Feb-07 6:29

you didn't read the other posts in the thread, did you ?

here[^] is what i told David about this...

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Re: intializing 2d array

David Crow15-Feb-07 5:36

David Crow

15-Feb-07 5:36

ikbahrian wrote:
could anyone plz tell me how can i intialized

unsigned short int test_array[256][256] to zero or empty

Like:

unsigned short test_array[256][256] = {0};

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

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

Re: intializing 2d array

toxcct15-Feb-07 5:40

toxcct

15-Feb-07 5:40

DavidCrow wrote:
unsigned short test_array[256][256] = {0};

does this set all the array cells to 0, or only the 1st one ? I have a doubt

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Re: intializing 2d array

David Crow15-Feb-07 6:02

David Crow

15-Feb-07 6:02

toxcct wrote:
does this set all the array cells to 0...

Yes, that's what the REP STOSD instruction is for.

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

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

Re: intializing 2d array

toxcct15-Feb-07 6:08

toxcct

15-Feb-07 6:08

STOSD means ?

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Re: intializing 2d array

David Crow15-Feb-07 6:16

David Crow

15-Feb-07 6:16

STOre String Doubleword.

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

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

Re: intializing 2d array

Mark Salsbery15-Feb-07 6:03

Mark Salsbery

15-Feb-07 6:03

toxcct wrote:
does this set all the array cells to 0, or only the 1st one ? I have a doubt

"If a class has a constructor, arrays of that class are initialized by a constructor. If there are
fewer items in the initializer list than elements in the array, the default constructor is used
for the remaining elements. If no default constructor is defined for the class, the initializer
list must be complete — that is, there must be one initializer for each element in the array."

But why doesn't this use the "default constructor" ...

unsigned short test;

Smile | :)

Great job, team. Head back to base for debriefing and cocktails.

Re: intializing 2d array

toxcct15-Feb-07 6:07

toxcct

15-Feb-07 6:07

yes, but we have no class here, only native type

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Re: intializing 2d array

Mark Salsbery15-Feb-07 6:09

Mark Salsbery

15-Feb-07 6:09

Right - check my post again (I just appended it Smile | :)

)

I see the behavior but I'd like to see it documented. Anyone know where I can find that?

Mark

Great job, team. Head back to base for debriefing and cocktails.

Re: intializing 2d array

prasad_som15-Feb-07 6:05

prasad_som

15-Feb-07 6:05

toxcct wrote:
does this set all the array cells to 0, or only the 1st one ? I have a doubt

It does set all array cells with 0, in this case. Actually, this is standard way to initialize array.

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

Re: intializing 2d array

Michael Dunn15-Feb-07 20:52

Michael Dunn

15-Feb-07 20:52

It sets the first element to 0 (because that's the value inside the braces). Then, since you're out of initializers, the remaining elements are automatically set to 0.

--Mike--
Visual C++ MVP Cool | :cool:

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counting the print

shakumar_2215-Feb-07 4:45

shakumar_22

15-Feb-07 4:45

Hello!
Iam beginner of vc++, and trying small project in vc++ using MFC.
Plz can any one give me the guide lines for the project
Counting the number of pages the printer was printing .
This is my first message ,so if any mistake in the message
Plz avoid that.

Regards,
shakumar

shakumar

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