C / C++ / MFC

kakan22-Dec-05 0:51

22-Dec-05 0:51

unsigned char bArray[sizeof(double)];
double d;
memcpy(bArray,&d, sizeof(double));

reverse:
memcpy(&d, bArray, sizeof(double));

toxcct22-Dec-05 0:56

22-Dec-05 0:56

kakan wrote:
unsigned char bArray[sizeof(double)];

won't compile. you have to do it this way :

unsigned char* bArray = new unsigned char[sizeof(double)];

which is why i directly put [8] to ease the code (standard C++ tell that the size of a double is fixed to 8 bytes, so doesn't vary).

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

kakan22-Dec-05 1:00

22-Dec-05 1:00

Hello.

You are right (of course).

But the memcpy is neat, isn't it? Laugh | :laugh:

toxcct22-Dec-05 1:02

22-Dec-05 1:02

yes, very good idea... but as i don't use it that much, it went off my thinking... D'Oh! | :doh:

well done

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

kakan22-Dec-05 1:03

22-Dec-05 1:03

Thanks.

nde_plume22-Dec-05 6:16

nde_plume

22-Dec-05 6:16

Actually you are incorrect. sizeof(double) is a compile time constant, and so it will compile. (Just to double check, I tried and it did.)

nde_plume22-Dec-05 6:11

nde_plume

22-Dec-05 6:11

Obviously the best wat to do this is to not do it, viz:

union MyConvert
{
double d;
BYTE bytes[sizeof(double)];
};

Thus for some function storeBytes(BYTE*p, size_t size)
to get a double called myVal stored do this:

MyConvert mc;
mc.d = myVal;
storeBytes(mc.bytes, sizeof(myVal);

or if you want to go nuts and save the copy:

storeBytes(((MyConvert*)(&myVal))->bytes, sizeof(myVal));

Though that might not work if the alignment requirements are different between double and unions.

CString+=

bachirzantou21-Dec-05 23:36

bachirzantou

21-Dec-05 23:36

Hi,
Could someone point me to the problem.
When I use this:

<br />
m_Edit.SetWindowText(str+"W");<br />

I get one "W" character displayed before str and two displayed after.
If str is "----------", I get "W----------WW".
Thank you,

Sebastian Schneider21-Dec-05 23:49

Sebastian Schneider

21-Dec-05 23:49

Does SetWindowText take a CString? I dont know where that SetWindowText comes from, but I will just assume it takes a LPSTR* or a const char*. In that case, you need to make sure that SetWindowText gets what it needs. I am not familiar with CString, but I suspect that (as of now) it is an alias for std::string? In that case, try

<br />
str += W;<br />
m_Edit.SetWindowText(str.c_str());<br />

Cheers
Seb

Cheers,
Sebastian

--
Contra vim mortem non est medicamen in hortem.

Cedric Moonen22-Dec-05 0:00

Cedric Moonen

22-Dec-05 0:00

Try to construct the CString before passing it to SetWindowText:

CString Temp = str + "W";<br />
m_Edit.SetWindowText(Temp);

vikas amin22-Dec-05 0:12

vikas amin

22-Dec-05 0:12

Is the m_edit box object of CEdit
i tried it and did not get any error
the str was dispalyed ad "---------W"

    CString str;<br />
str.Format ("----------");<br />
m_memorystatus.SetWindowText (str+'W');

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Owner drawn22-Dec-05 0:19

22-Dec-05 0:19

bachirzantou wrote:
m_Edit.SetWindowText(str+"W");

CString str =="Whatever text";

str+="W";

m_Edit.SetWindowText(str);
or
m_Edit.SetWindowText(str.GetBuffer(0));
or
m_Edit.SetWindowText(str.operator LPCTSTR());

Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord

toxcct22-Dec-05 0:27

22-Dec-05 0:27

SetWindowText() is waiting for a CString, so there's no reason for casting back into a C-style string (LPCTSTR).

moreover, when somebody took time to design a cast operator, it should be used properly, in the C style too. so, instead of writing str.operator LPCTSTR(), simply write (LPCTSTR)str

one last thing. when you .GetBuffer() a CString, you should release it then (which you seemed to forget here...)

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Owner drawn22-Dec-05 0:30

22-Dec-05 0:30

Game over;P

toxcct22-Dec-05 0:32

22-Dec-05 0:32

Owner drawn wrote:
Game over

for you ?

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

ThatsAlok22-Dec-05 1:52

ThatsAlok

22-Dec-05 1:52

toxcct wrote:
Owner drawn wrote:
Game over
for you ?

which game are we playing Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

toxcct22-Dec-05 2:12

22-Dec-05 2:12

ThatsAlok wrote:
which game are we playing

hey, you wrote it, so it's you to tell me man !!

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

[ot]Re: CString+=

ThatsAlok22-Dec-05 2:17

ThatsAlok

22-Dec-05 2:17

toxcct wrote:
hey, you wrote it, so it's you to tell me man !!

Ringa Ringa Roses Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

OT- :)

Owner drawn22-Dec-05 17:15

22-Dec-05 17:15

ThatsAlok wrote:
which game are we playing

Break-A-Crack-Brack-Drack-Dreak-Hreak

Poke tongue | ;-P

-- modified at 23:16 Thursday 22nd December, 2005

Re: OT- :)

ThatsAlok22-Dec-05 17:49

ThatsAlok

22-Dec-05 17:49

Owner drawn wrote:
Break-A-Crack-Brack-Drack-Dreak-Hreak

what game is that Smile | :)

.... is we are bird Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Owner drawn22-Dec-05 0:38

22-Dec-05 0:38

toxcct wrote:
one last thing. when you .GetBuffer() a CString, you should release it then (which you seemed to forget here...)

it should be followed up with a ReleaseBuffer() Wink | ;)

toxcct wrote:
SetWindowText() is waiting for a CString, so there's no reason for casting back into a C-style string (LPCTSTR).

Yeah you are right. Big Grin | :-D

-- modified at 6:39 Thursday 22nd December, 2005

vikas amin22-Dec-05 1:24

vikas amin

22-Dec-05 1:24

The game dont end thill a stable solution is found

Happy christmus
to u also
&
all persons in Codeproject

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

toxcct22-Dec-05 0:54

22-Dec-05 0:54

idiot question, but, what about using the debugger to see the state of the variable str before and after the operation ?

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

kakan22-Dec-05 0:58