Re: converting char* into BYTE* - C / C++ / MFC Discussion Boards

Re: converting char* into BYTE*

CPallini28-Jul-08 3:22

CPallini

28-Jul-08 3:22

Short (and dangerous) answer: with a cast, for instance

char  * myCharPointer ="hello";
BYTE * myBytePointer = (BYTE *) myCharPointer;

A better answer may follow a more detailed request.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: converting char* into BYTE*

toxcct28-Jul-08 3:33

toxcct

28-Jul-08 3:33

of course, you're looking for devil every where :p

a char* is not always a string Wink | ;)

char c = 'c';
char* pc = &c;
 
BYTE* pb1 = (BYTE*)pc;
BYTE* pb2 = reinterpret_cast<BYTE*>(pc);

BTW, looking at the level of the question, i think it's worth saying that a char IS a BYTE:

char c = 'c';
 
BYTE b = c;

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Re: converting char* into BYTE*

VaDa Um Uie28-Jul-08 3:45

VaDa Um Uie

28-Jul-08 3:45

toxcct wrote:
a char* is not always a string

char* is never a string. Laugh | :laugh:

Re: converting char* into BYTE*

toxcct28-Jul-08 3:50

toxcct

28-Jul-08 3:50

what do you know about C++, you Mr univoter ?

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Re: converting char* into BYTE*

VaDa Um Uie28-Jul-08 3:52

VaDa Um Uie

28-Jul-08 3:52

nice arguments Laugh | :laugh:

Re: converting char* into BYTE*

CPallini28-Jul-08 7:20

CPallini

28-Jul-08 7:20

toxcct wrote:
of course, you're looking for devil every where [Poke tongue]

of course. Smile | :)

toxcct wrote:
BTW, looking at the level of the question, i think it's worth saying that a char IS a BYTE:

Nope. As you know (I know that you know Wink | ;)

), char is a signed integer ranging from -128 to 127, while a BYTE is an unsigned integer ranging from 0 to 255.
Poke tongue | ;-P

Re: converting char* into BYTE*

toxcct28-Jul-08 9:04

toxcct

28-Jul-08 9:04

but you're already going to far by interpreting the bits pattern.

a BYTE is 8 bits, which is exactly what a char is supposed to be too. Wink | ;)

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Re: converting char* into BYTE*

CPallini28-Jul-08 11:34

CPallini

28-Jul-08 11:34

toxcct wrote:
but you're already going to far by interpreting the bits pattern.

Duty sir, duty. Roll eyes | :rolleyes:

toxcct wrote:
a BYTE is 8 bits, which is exactly what a char is supposed to be too.

float and int (even pointers!) have the same size on 32 bit systems but we usually don't consider them being the same.

Big Grin | :-D

Re: converting char* into BYTE*

Matthew Faithfull28-Jul-08 3:22

Matthew Faithfull

28-Jul-08 3:22

Something like:

<br />
BYTE* pByte = reinterpretcast< BYTE* >( pChar );<br />

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

Re: converting char* into BYTE*

toxcct28-Jul-08 3:30

toxcct

28-Jul-08 3:30

Matthew Faithfull wrote:
BYTE* pByte = reinterpretcast< BYTE* >( pChar );

quite... reinterpret_cast is the correct word ^^

BTW, i didn't try, but wouldn't static_cast just work here ?

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Re: converting char* into BYTE*

Matthew Faithfull28-Jul-08 4:11

Matthew Faithfull

28-Jul-08 4:11

Right you are, I knew that looked wrong somehow. I don't think static_cast works on pointers even when there are in fact a type match as these probably would be. Would have to try it to be sure.

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

Re: converting char* into BYTE*

Rajesh R Subramanian28-Jul-08 4:30

Rajesh R Subramanian

28-Jul-08 4:30

toxcct wrote:
BTW, i didn't try, but wouldn't static_cast just work here ?

A static_cast won't work.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: converting char* into BYTE*

Rajesh R Subramanian28-Jul-08 4:25

Rajesh R Subramanian

28-Jul-08 4:25

A BYTE is nothing but an unsigned char. If you do the math, that would tell you that the conversion may result in data loss, depending on the value stored in the char variable. The following situation may be an example:

char p = -23;
int i; // if you assign p to i, you'll not lose data.
BYTE b; // if you assign p to b, you'll lose data.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: converting char* into BYTE*

Matthew Faithfull28-Jul-08 4:53

Matthew Faithfull

28-Jul-08 4:53

To be very picky you don't actually loose data, as it's still an 8-bit value. It's just that the semantics change, your -23 = 11101001 gets reinterpretted as 233 = 11101001. Smile | :)

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

I forgot to include the footer:

Rajesh R Subramanian28-Jul-08 5:08

Rajesh R Subramanian

28-Jul-08 5:08

[Footer: not for nitpicks, but for the noob op] Laugh | :laugh:

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Console WIndos Size

Andy20228-Jul-08 3:16

Andy202

28-Jul-08 3:16

I wanted to use a Console Window to output some debug information for my MFC application, that all works fine, but would like to make the Window a bit larger without having to modify the properties of the Console WIndow by hand each time.

I tried this bit of code as the Console was being created - but did not work.

AllocConsole();
m_hConsole = GetStdHandle( STD_OUTPUT_HANDLE );
int handle = _open_osfhandle( (long) m_hConsole, _O_TEXT );
m_fConsole = _fdopen( handle, "w" );
// Try and set the Window to this size !!!!!!!!!!!!!
dwSize.X = 120;
dwSize.Y = 50;
SetConsoleScreenBufferSize(m_hConsole, dwSize);

Any sugegstions please

Andy.

Re: Console WIndos Size

Luc Pattyn28-Jul-08 4:25

Luc Pattyn

28-Jul-08 4:25

Hi,

on WinXP the layout tab of the console allows you to modify its buffer and window size, and
to make these changes permanent for all future console windows with the same title.

on Vista the option is gone, it just always does it that way.

So for both: do it once manually, then keep the title constant.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

How get to UserName ? (with Windows API)

Member 373633528-Jul-08 2:49

Member 3736335

28-Jul-08 2:49

Hi there

I have a Some Question

When I Get Logon UserName , I try to use GetUsername Function

But, Function retrieve Name that is "SYSTEM"

Why are retrieve "SYSEM" user name?

Re: How get to UserName ? (with Windows API)

Hamid_RT28-Jul-08 2:57

Hamid_RT

28-Jul-08 2:57

Can you show your code?

Re: How get to UserName ? (with Windows API)

Member 373633528-Jul-08 3:01

Member 3736335

28-Jul-08 3:01

TCHAR infoBuf[INFO_BUFFER_SIZE]; //Account Name
DWORD bufCharCount = INFO_BUFFER_SIZE;

if(NULL == GetUserName(infoBuf, &bufCharCount) )
{
DWORD dwRet = GetLastError();
}

thats all;

Re: How get to UserName ? (with Windows API)

_AnsHUMAN_ 28-Jul-08 2:57

_AnsHUMAN_

28-Jul-08 2:57

Member 3736335 wrote:
GetUsername Function

The GetUserName function retrieves the user name of the current thread.

Try the NetUserGetInfo() function retrieves information about a particular user account on a server or NetWkstaUserEnum
Hope this helps

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: How get to UserName ? (with Windows API)

Member 373633528-Jul-08 3:12

Member 3736335

28-Jul-08 3:12

Thanks your reply

now i trying to NetUserGetInfo Function , but thats so hard to me~!

hehe Smile | :)

Re: How get to UserName ? (with Windows API)

_AnsHUMAN_ 28-Jul-08 3:19

_AnsHUMAN_

28-Jul-08 3:19

Did you try to google with NetUserGetInfo keywork. I got this
Sample Here[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: How get to UserName ? (with Windows API)

Member 373633528-Jul-08 3:37

Member 3736335

28-Jul-08 3:37

Very Thanks _AnShUmAn_ Smile | :)

When i find some information , i can try WNetGetUser Function.

the function is same retrieve logon user name.

so, what is different that WNetGetUser and GetUserName?

a Question about Novell eDirectory ?

Sakthiu28-Jul-08 2:24

Sakthiu

28-Jul-08 2:24

any body has experience with novell edirectory LDAP server from your application ?

if yes,

I want to send multiple asyncronus requests to edirectory LDAP server. when i try send 1000 request at a time, eDir LDAP server accepts only few requests.

How can i tune eDir LDAP server into support huge requests ?

Thanks,
Sakthi

Nice things do nice works

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