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writing to HiWord LoWord

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kot1990
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Joined: 06 Sep 2009
Posts: 131
Location: Greece

Posted: Sat Mar 06, 2010 10:16 am Post subject: writing to HiWord LoWord

I have an array of bytes, and a WORD. I want to write the 2 bytes seperately in the WORD. How should I do it. Example

Code:

WORD TheWord;
BYTE Bytes[100]; <-- say this is full with values.

TheWord = Bytes[0]; <-- High
TheWord = Bytes[1]; <-- Low

If I do that, only the Low Word will be written, the High Word will be empty.
Please help to do it.

EDIT: I am thinking now,, if I multiply the high byte with 256 will give the high word value. Eg. I want to write 0xB6.

0xB6 * 256 = 0xB600 and then just adding up the low word??

Last edited by kot1990 on Sat Mar 06, 2010 10:26 am; edited 1 time in total

&Vage
Grandmaster Cheater Supreme

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Joined: 25 Jul 2008
Posts: 1053

Posted: Sat Mar 06, 2010 10:26 am Post subject: Re: writing to HiWord LoWord

kot1990 wrote:

I have an array of bytes, and a WORD. I want to write the 2 bytes seperately in the WORD. How should I do it. Example

Code:

WORD TheWord;
BYTE Bytes[100]; <-- say this is full with values.

TheWord = Bytes[0]; <-- High
TheWord = Bytes[1]; <-- Low

If I do that, only the Low Word will be written, the High Word will be empty.
Please help to do it.

Derrp look at your code... you're rewriting "TheWord".

kot1990
Expert Cheater

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Joined: 06 Sep 2009
Posts: 131
Location: Greece

Posted: Sat Mar 06, 2010 10:30 am Post subject: Re: writing to HiWord LoWord

&Vage wrote:

Derrp look at your code... you're rewriting "TheWord".

yes I know,, what I want to do when writing the High Word,, is that I want to distinguish it, so it will write on the high Word , and not the low word, so I won't rewrite the Low Word.

AtheistCrusader
Grandmaster Cheater

Reputation: 6

Joined: 23 Sep 2006
Posts: 681

Posted: Sat Mar 06, 2010 10:51 am Post subject:

Code:

#include <Windows.h>
#include <iostream>
using namespace std;
int main()
{
BYTE Byte = 64;
BYTE byte = 65;
LONG TheWord;
TheWord = MAKELONG(Byte,byte);
cout << LOWORD(TheWord) << " " << HIWORD(TheWord) << endl;
system("PAUSE");
}

kot1990
Expert Cheater

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Joined: 06 Sep 2009
Posts: 131
Location: Greece

Posted: Sat Mar 06, 2010 10:57 am Post subject:

Thx man

I'll keep in mind,, I found another way to do it like

Code:

WORD TheWord;
BYTE Bytes[100]; <-- say this is full with values.

TheWord = Bytes[0] * 256; <-- High
TheWord += Bytes[1]; <-- Low

tombana
Master Cheater

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Joined: 14 Jun 2007
Posts: 456
Location: The Netherlands

Posted: Sat Mar 06, 2010 1:23 pm Post subject:

Code:

WORD TheWord;
BYTE Bytes[100]; <-- say this is full with values.

TheWord = Bytes[0] << 8 | Bytes[1];

Just to note: the following would use Bytes[0] as low word and Bytes[1] as high word:

Code:

TheWord = *(WORD*)&Bytes[0];

hcavolsdsadgadsg
I'm a spammer

Reputation: 26

Joined: 11 Jun 2007
Posts: 5801

Posted: Sat Mar 06, 2010 5:38 pm Post subject: Re: writing to HiWord LoWord

kot1990 wrote:

I have an array of bytes, and a WORD. I want to write the 2 bytes seperately in the WORD. How should I do it. Example

Code:

WORD TheWord;
BYTE Bytes[100]; <-- say this is full with values.

TheWord = Bytes[0]; <-- High
TheWord = Bytes[1]; <-- Low

I think you were aiming for something like this?

Code:

int main()
{
WORD dongs;
WORD w = 0x1234;
BYTE* b = (BYTE*)&w;

b[0] += 1; //b[0] is 0x34 before the addition
b[1] += 1; //take a guess

dongs = (WORD)(b[0] | b[1] << 8); //or...
dongs = *(WORD*)b;

return 0;
}

you can just use a bitwise or to 'combine', just make sure you shift appropriately... or you can just cast it.

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