C / C++ / MFC

ashishbhatt22-Oct-07 20:37

ashishbhatt

22-Oct-07 20:37

I have used this code to check the value stored on memory and so I found the output like as explained.

<br />
	double x = 2;<br />
	unsigned char *str;<br />
	str = (unsigned char *)malloc(sizeof(unsigned char *));<br />
	str = (unsigned char *)&x;<br />
<br />
	CString st, str1;<br />
	str1 = "";<br />
	for(int i = 0; i < 8; i++)<br />
	{<br />
		st.Format(CString("%.2X "), *(str++));<br />
		str1.Append(st);<br />
	}<br />
	AfxMessageBox(str1);<br />
<br />

here the output like as below....

00 00 00 00 00 00 00 40 in messagebox.

Ashish Bhatt

Anand Todkar22-Oct-07 20:57

Anand Todkar

22-Oct-07 20:57

ashishbhatt wrote:
00 00 00 00 00 00 00 40 in messagebox.

The output is correct, what u have to do is to read it in reverse order. I think this is the solution Smile | :)

Thanks,
Anand.

ashishbhatt22-Oct-07 21:16

ashishbhatt

22-Oct-07 21:16

ya thats right

but i want the reverse process.

I have that reverse data('40 00 00 00 00 00 00 00') now i want its double value('2') of this data without storing it into memory

Any idea?

Thanks in advance

Ashish Bhatt

Anand Todkar22-Oct-07 21:28

Anand Todkar

22-Oct-07 21:28

ashishbhatt wrote:
I have that reverse data('40 00 00 00 00 00 00 00') now i want its double value('2') of this data without storing it into memory

For this to happen, you need to convert the data from memory to equivalent binary and then to convert that binary to decimal.

I find this as a solution.

Thanks,
Anand.

Cedric Moonen22-Oct-07 21:02

Cedric Moonen

22-Oct-07 21:02

Woww what are you trying to do ??

ashishbhatt wrote:
str = (unsigned char *)malloc(sizeof(unsigned char *));

This is plain wrong: you will allocate a memory of 4 bytes because unsigned char* is a pointer and a pointer is 4 bytes long. Is that what you want to do ? That's quite a strange way to work...

ashishbhatt wrote:
str = (unsigned char *)&x;

Here you will assign a new address to your str pointer, meaning that you will loose ownership of the previsously allocated memory (now it is 4 bytes of memory that are in memory and you can't access it anymore because you lost its address).

ashishbhatt wrote:
st.Format(CString("%.2X "), *(str++));

Why do you construct a CString inside the Format function ? Confused | :confused:

And what are you trying to do ??

So, I think your code is just plain wrong. Can you explain what you are trying to do exactly, maybe we'll be albe to help.

On a side note, you have to know that the bytes are stored in memory in an inverted way (on windows platforms).

Cédric Moonen
Software developer

Charting control [v1.2]

Nishad S22-Oct-07 21:02

Nishad S

22-Oct-07 21:02

I checked the code (had to do some corrections). And found that it displays same as that we can see in the Memory window at the time of debug. But you are expecting something different? Can you explain?

- NS -

codeII22-Oct-07 21:25

codeII

22-Oct-07 21:25

You cannot change these types in memory, because int and double have different sizes in memory.
Else you could have changed your type in memory like this:

int     nTst = 2;
double  dTmp = (double) nTst;
double* pTst = (double*)&nTst;
*pTst = dTmp;

Is this what you meant?

Making a particular item of listview bold

chandu00423-Oct-07 0:17

chandu004

23-Oct-07 0:17

hai ashish,
can you explain exactly what you want, as Cedric Moonen said, may be we will be able to help.

jyothi lakshmi22-Oct-07 19:46

jyothi lakshmi

22-Oct-07 19:46

I want to make a particular item in listview bold after it is inserted, based on specific condition.
Below is the code that i am trying. But its not working. Can someone suggest me a way to do it

HFONT hDlgFont = (HFONT)SendMessage(get_Dialog(), WM_GETFONT, 0, 0L);
            if (NULL != hDlgFont) 
            {
                LOGFONT lFont;
                if (GetObject(hDlgFont, sizeof(LOGFONT), (LPSTR)&lFont)) 
                {
                    lFont.lfWeight = FW_BOLD;
                    hBoldFont = CreateFontIndirect(&lFont);
                }
            }

HWND hList;
LVITEM item;
//set attributes of item
ListView_InsertItem(hList, &item);

if (<condition>)
    SendMessage(GetDlgItem(hList,item.iItem), WM_SETFONT, (WPARAM)hBoldFont, 0L);

Re: Making a particular item of listview bold

Nishad S22-Oct-07 20:07

Nishad S

22-Oct-07 20:07

You have to use CustomDraw

- NS -

Re: Making a particular item of listview bold

Naveen22-Oct-07 20:08

Re: Making a particular item of listview bold

22-Oct-07 20:08

You cannot change a perticular item of list control bold. If you want to do so, you have customdraw the list control. check this[^] for details of using the customdraw

nave

[OpenedFileFinder]

Hamid_RT22-Oct-07 20:40

Hamid_RT

22-Oct-07 20:40

Creating a CListCtrl Class with Item Style Features (CListCtrlStyled Class)
[^].

Am I in a UI thread?

Peter Weyzen22-Oct-07 19:32

Peter Weyzen

22-Oct-07 19:32

For the sake of debug -- is there a way to determine that this thread is a UI thread (one based on CWinThread)?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</A>

Naveen22-Oct-07 19:35

22-Oct-07 19:35

IsGUIThread()

nave

[OpenedFileFinder]

James R. Twine23-Oct-07 1:51

James R. Twine

23-Oct-07 1:51

IsGUIThread(...) is not an MFC function, and is only available on WinXP (and above).

Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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Naveen23-Oct-07 3:00

23-Oct-07 3:00

James R. Twine wrote:
IsGUIThread(...) is not an MFC function

Cant he use this API in an MFC application?

nave

[OpenedFileFinder]

David Crow23-Oct-07 3:45

David Crow

23-Oct-07 3:45

What is a "GUI thread?"

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

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Naveen23-Oct-07 5:22

23-Oct-07 5:22

I think a thread that has some user interface with the user is called GUI thread. I mean a thread that has a window or message loop some thing like that... What do you think?

nave

[OpenedFileFinder]

David Crow23-Oct-07 5:27

David Crow

23-Oct-07 5:27

Naveen.R wrote:
What do you think?

I was just asking for clarification. I've always referred to a "GUI thread" as one with a message loop, whereas a "worker thread" as one without a message loop. In reality, the latter can also interact with UI components but not trivially.

Naveen23-Oct-07 14:12

23-Oct-07 14:12

After you asked me the question I tried to call the function IsGUIThread() function from a thread which was created using AfxBeginThread() and CreateThread(). the behavior I found was that the IsGUIThread() function return true when called from a thread created using AfxBeginThread() where as it retured FALSE when called from a thread created using CreateThread(). after checking the MFC code, I found that When we call the AfxBeginThread the Entry point is actually _AfxThreadEntry and inside that function a SetWindowsHookEx() is called. Thats why the IsGUIThread() function returned TRUE when called from such threads. But I didnt understand why..

nave

[OpenedFileFinder]

Peter Weyzen23-Oct-07 11:41

Peter Weyzen

23-Oct-07 11:41

Thank you very much -- I will investigate!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</A>