Re: Convert a char[ ] to int[ ] [modified] - C / C++ / MFC Discussion Boards

Re: Hide cursor on CEdit?

David Crow1-Nov-07 4:32

David Crow

1-Nov-07 4:32

Then why not just use a static control, or a disabled edit control?

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Re: Hide cursor on CEdit?

Gofur Halmurat1-Nov-07 4:39

Gofur Halmurat

1-Nov-07 4:39

Because the Cedit control supports a link, or colored text, that is why i am using it, or what else would u recomment?

Re: Hide cursor on CEdit?

David Crow1-Nov-07 4:44

David Crow

1-Nov-07 4:44

Gofur Halmurat wrote:
Because the Cedit control supports a link, or colored text, that is why i am using it, or what else would u recomment?

You can have colored text just as easily with a standard static control.

Re: Hide cursor on CEdit?

Gofur Halmurat1-Nov-07 4:49

Gofur Halmurat

1-Nov-07 4:49

Yeah, i just found an article about it, here is the link
I am gonna use CStatic instead of CEdit, but i am still wondering, why can not we hide caret?.....
anyway the topic is open to discuss!!!

Thanks David.

Convert a char[ ] to int[ ]

NYTSX31-Oct-07 4:59

NYTSX

31-Oct-07 4:59

Hey all,

What is the easiest way to convert a char[] to an int[]so that the elements of the int array are the combination of 4 char elements?
Here is an example of what I mean;

if

  <code>
char tempChar[8] = {0};
int  tempInt[2]  = {0};

tempChar[0] = 0x00;
tempChar[1] = 0x11;
tempChar[2] = 0x22;
tempChar[3] = 0x33;
tempChar[4] = 0x44;
tempChar[5] = 0x55;
tempChar[6] = 0x66;
tempChar[7] = 0x77;</code>

how do I get

  <code>
tempInt[0] = 0x00112233;
tempInt[1] = 0x44556677;</code>

Thanks!

Re: Convert a char[ ] to int[ ]

Nelek31-Oct-07 5:10

Nelek

31-Oct-07 5:10

One possible way is to add the most significant char to the int and move the bits to the left with <<, then the next one and so on.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: Convert a char[ ] to int[ ]

NYTSX31-Oct-07 5:19

NYTSX

31-Oct-07 5:19

thank you for the reply...

I was trying to see which is the fastest way to do this if I say have 100 elements in the int[]?

Re: Convert a char[ ] to int[ ] [modified]

George L. Jackson31-Oct-07 5:23

George L. Jackson

31-Oct-07 5:23

You can also use an union:

#include <iostream>

using namespace std;

union Char2int
{
unsigned char tempChar[8];
unsigned int tempInt[2];
};

int _tmain(int argc, _TCHAR* argv[])
{

Char2int c2i;

c2i.tempChar[0] = 0x33;
c2i.tempChar[1] = 0x22;
c2i.tempChar[2] = 0x11;
c2i.tempChar[3] = 0x00;
c2i.tempChar[4] = 0x77;
c2i.tempChar[5] = 0x66;
c2i.tempChar[6] = 0x55;
c2i.tempChar[7] = 0x44;

for (int i = 0; i < 2; ++i)
wcout << std::hex << c2i.tempInt[i] << endl;

return 0;
}

"We make a living by what we get, we make a life by what we give." --Winston Churchill

-- modified at 11:45 Wednesday 31st October, 2007

Re: Convert a char[ ] to int[ ]

NYTSX31-Oct-07 7:28

NYTSX

31-Oct-07 7:28

Thanks George and everyone else for their help....this is exactly what I was looking for in order to save processing time.

Re: Convert a char[ ] to int[ ]

Roger Stoltz31-Oct-07 7:57

Roger Stoltz

31-Oct-07 7:57

As I interpret your initial post, you may not get what you want with the proposed union solution.

NYTSX wrote:

tempChar[0] = 0x00;
tempChar[1] = 0x11;
tempChar[2] = 0x22;
tempChar[3] = 0x33;
tempChar[4] = 0x44;
tempChar[5] = 0x55;
tempChar[6] = 0x66;
tempChar[7] = 0x77;

This would in all systems, regardless of byte ordering, generate the following memory contents:
00 11 22 33 44 55 66 77

If you convert the memory contents above to two adjacent 32-bit integers you will, on a little-endian system like most systems running windows, get 0x33221100 and 0x77665544.

NYTSX wrote:
how do I get
tempInt[0] = 0x00112233;
tempInt[1] = 0x44556677;

My point is that the union solution will work on a big-endian system, but not on a little-endian system in terms of how I interpret your question.
To make a portable solution you would have to walk through the char array, one element at a time, and shift the integer value like Nelek suggested.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: Convert a char[ ] to int[ ]

George L. Jackson31-Oct-07 8:06

George L. Jackson

31-Oct-07 8:06

Remember that the code above is not portable, and you should comment your code that it is so!

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: Convert a char[ ] to int[ ]

David Crow31-Oct-07 10:23

David Crow

31-Oct-07 10:23

George L. Jackson wrote:
Remember that the code above is not portable...

But since this forum is for VC++ code, and nothing was even remotely mentioned about portability, does it matter?

Re: Convert a char[ ] to int[ ]

George L. Jackson31-Oct-07 17:14

George L. Jackson

31-Oct-07 17:14

Your right. The poster is happy. I am happy he is happy. So, don't worry. Be happy! Big Grin | :-D

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: Convert a char[ ] to int[ ]

Cedric Moonen31-Oct-07 5:26

Cedric Moonen

31-Oct-07 5:26

A simple casting should do the trick:

int* tempInt = (int*)tempChar;

But be carefull with byte ordering ! As the bytes are stored in an inverted way in memory. It means that if you have those bytes in memory:

0x00 0x00 0x00 0x01

And you interprete those bytes as an integer (like you will do with the cast), the resulting integer value won't be one (but 0x01000000).

Cédric Moonen
Software developer

Charting control [v1.2]

Re: Convert a char[ ] to int[ ]

toxcct31-Oct-07 5:31

toxcct

31-Oct-07 5:31

Cedric Moonen wrote:
As the bytes are stored in an inverted way in memory

partially right. all depends of the system.

but one should always care about bytes order anyway

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Convert a char[ ] to int[ ]

toxcct31-Oct-07 5:30

toxcct

31-Oct-07 5:30

union is the best, because you can save some processin time the shift operator would consume...

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Convert a char[ ] to int[ ]

Robert Surtees1-Nov-07 10:22

Robert Surtees

1-Nov-07 10:22

int *tip;

tip = (int *) tempChar;

Flickering Problem

mcsherry31-Oct-07 4:28

mcsherry

31-Oct-07 4:28

I a CDialog based application which has approx 30 CBitmapButtons and 30 CStatic text boxes. I'm receiving data at about 20hz which is causing the screen to flicker badly when these are getting repopulated. I've looked at the usual ways of stopping/reducing the flicker (overloading OnEraseBkgnd, using InvalidateRect ( rect, FALSE ), Invalidate (FALSE), etc...) with no luck. Does anyone have any ideas how I can overcome this? One idea I've had is buffering the entire dialog before painting it, however I can only find examples on how to do this with bitmap controls rather than an entire dialog with controls.

TIA,
Andy

Re: Flickering Problem

Mark Salsbery31-Oct-07 5:22

Mark Salsbery

31-Oct-07 5:22

I would look into updating the controls without redrawing the entire dialog
(especially its background) every time data is updated.

Also limiting the update region(s) to just areas that change helps alot.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Flickering Problem

mcsherry31-Oct-07 5:33

mcsherry

31-Oct-07 5:33

Hi Thanks for your reply. I've delved further into this now and have found that the flickering is due (or at least appears to be due) to the fact that I have controls on top of each other, an example is that I will have a Group Box with a CEdit control inside of it, when they are seperate they don't flicker when combined they do. I'm using the Group box to provide a border effect to the CEdit control as none of the built in border styles are suitable, so if I can get an identicle border in another way then my problem may be sorted! Do you have any ideas on how to do this?

cheers,
Andy

Re: Flickering Problem

mcsherry31-Oct-07 6:00

mcsherry

31-Oct-07 6:00

well sort of the answer, further to my above post, I've got rid of the group boxes and changed the style of the CEdit controls to have the Border, Modal Frame and Static Edge set to TRUE. Although this border is thicker than I wanted it is better to look at than a flickering screen!

Any suggestions on how to make this border thinner would be great Smile | :)

Andy,

Re: Flickering Problem

Mark Salsbery31-Oct-07 6:21

Mark Salsbery

31-Oct-07 6:21

mcsherry wrote:
Any suggestions...

I'm still wondering why the groupbox causes flicker. Is it just a Z-order thing?
If you set the tab order, the groupbox should be before any controls "inside" it.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

how to splice two images with diffrent palette?

King Tran31-Oct-07 4:25

King Tran

31-Oct-07 4:25

i have two 8 bit 256 color images, they have different color palette, i want to replace some pixels of one image with other image's pixels. how can i do it since they have different palette?

or i can describe the question with another way: also with the two images, i want to splice them together, how can do it with VC++?

thanks

Re: how to splice two images with diffrent palette?

C^hris L^osinger31-Oct-07 8:50

C^hris L^osinger

31-Oct-07 8:50

if you don't or can't change the palette of the destination image, you'll have to use a method to take the color from the source image and find the closest color in the destination palette.

or, you could covert them all to RGB-24, combine the images, then use a color quantization and dithering function convert the result back to the palette you need.

splicing images depends on the format of the pixels in memory.

your best bet is to use one of the many image processing toolkits that are available.

image processing toolkits | batch image processing

Re: how to splice two images with diffrent palette?

King Tran4-Nov-07 2:53

King Tran

4-Nov-07 2:53

thanks Chris Losinger, you have given me a big help!

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