C / C++ / MFC Discussion Boards

Re: Notify Change

ThatsAlok11-Apr-05 23:45

ThatsAlok

11-Apr-05 23:45

Actaully What type of of problem are you facing sir!

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Alok Gupta
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Re: Notify Change

sunit512-Apr-05 0:42

sunit5

12-Apr-05 0:42

this the code....
DWORD change= WaitForSingleObject(hr,INFINITE);
if(change==WAIT_OBJECT_0)
::AfxMessageBox("CHANGE HAS BEEN DETECTED");
FindCloseChangeNotification(hr);

in the ::AfxMessageBox() I WANT TO MENTION THE REASON FOR NOTIFICATION ie DUE TO FILE DELETION OR FILE RENAME ETC

Re: Notify Change

ThatsAlok12-Apr-05 0:52

ThatsAlok

12-Apr-05 0:52

this api will help in this regard [ReadDirectoryChangesW]

And here is Article dealing with it
http://www.codeproject.com/file/directorychangewatcher.asp[^]

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Alok Gupta
visit me at http://www.thisisalok.tk

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Re: Notify Change

sunit512-Apr-05 0:57

sunit5

12-Apr-05 0:57

THANKS ALOK

LONGLONG

fardak11-Apr-05 22:07

fardak

11-Apr-05 22:07

How to convert a LONGLONG data type to binary ?
Thanks for any help.

Re: LONGLONG [Edited]

Joel Holdsworth11-Apr-05 22:56

Joel Holdsworth

11-Apr-05 22:56

I guess you mean convert to a binary string... right? If you can't find a runtime library function to do it, try something like this:

LONGLONG value = 12345;
TCHAR mystring[sizeof(LONGLONG)*8 + 1];
for(int i = 0; i < sizeof(LONGLONG)*8; i++)
	mystring[i] = ((value >> (sizeof(LONGLONG)*8 - i - 1)) & 1) ? _T('1') : _T('0');
mystring[sizeof(LONGLONG)*8] = 0;

Hope that helps.

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

Re: LONGLONG

fardak11-Apr-05 23:22

fardak

11-Apr-05 23:22

Thank you.
I tried to put the answer to the code you gave me in a message box like that:

void CMyBitsDlg::ConvertLLtoBin()
{ LONGLONG value = 12345;
TCHAR mystring[sizeof(LONGLONG)];
for(int i = 0; i < sizeof(LONGLONG); i++)
mystring[i] = ((value >> (sizeof(LONGLONG) - i - 1)) & 1) ? _T('1') : _T('0');
AfxMessageBox(mystring);
}

The answer is 00111001P@
Any idea about the error?

Re: LONGLONG

toxcct11-Apr-05 23:27

toxcct

11-Apr-05 23:27

you forgot to end your string with

mystring[i] = '\0';

that doesn't happend with my CString (see here[^])

of course, int i; should be declared before for() loop...

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

Re: LONGLONG

Joel Holdsworth12-Apr-05 0:06

Joel Holdsworth

12-Apr-05 0:06

Yes the thought just popped into my mind, and I just returned now to correct my mistake.

Joel Holdsworth

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Check out my online CV and project history[^]

Re: LONGLONG [edited]

toxcct11-Apr-05 23:08

toxcct

11-Apr-05 23:08

datas are written in binary format in memory...

however, if you like to print an integer in binary format, this link[^] should help.
here is the sample :

<font color=#0000FF>LONGLONG</font> iVal = 125932;   <font color=#008000>// For example</font>
CString strVal = <font color=#808080>""</font>;      <font color=#008000>// CString because more easy to use</font>

<font color=#0000FF>for</font> (<font color=#0000FF>int</font> i = 0; i < <font color=#0000FF>sizeof</font>(LONGLONG); i++) {
    strVal.Insert(0, ((iVal & 0x00000001) ? <font color=#808080>"1"</font> : <font color=#808080>"0"</font>));
    iVal >>= 1;
}

cheers,

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

Re: LONGLONG

fardak11-Apr-05 23:42

fardak

11-Apr-05 23:42

Thank you.
Pls read my reply to Joel Holdsworth.

Re: LONGLONG

toxcct11-Apr-05 23:47

toxcct

11-Apr-05 23:47

fardak wrote:
Pls read my reply to Joel Holdsworth

hey, already done...

you define mystring as a TCHAR[], which need a trailing '\0' to be displayed correctly...

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

Re: LONGLONG

fardak12-Apr-05 0:05

fardak

12-Apr-05 0:05

Thanks again.
I rewrote this:
void CMyBitsDlg::ConvertLLtoBin()
{ LONGLONG value = 12345;
TCHAR mystring[sizeof(LONGLONG)];
for(int i = 0; i < sizeof(LONGLONG); i++)
mystring[i] = ((value >> (sizeof(LONGLONG) - i - 1)) & 1) ? _T('1') : _T('0');
mystring[i]='\0'; //added
AfxMessageBox(mystring);
}

And the answer is 00111001 which is 39 hexadecimal.
So something is wrong.
But the strange thing happening now is that I have an error memory reading message.

Re: LONGLONG

Joel Holdsworth12-Apr-05 0:11

Joel Holdsworth

12-Apr-05 0:11

Almost correct. You need to change

TCHAR mystring[sizeof(LONGLONG)];

TCHAR mystring[sizeof(LONGLONG) + 1];

and instead of writing

mystring[i]='\0';

try

mystring[sizeof(LONGLONG)] = 0;

I think that might help

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

Re: LONGLONG

fardak12-Apr-05 0:26

fardak

12-Apr-05 0:26

Thanks again.
Ok the last version is

void CMyBitsDlg::ConvertLLtoBin()
{ //LONGLONG value = 12345;
LONGLONG value = 0xFF FF FF FF FF FF FF FF;
TCHAR mystring[sizeof(LONGLONG)+1];
for(int i = 0; i < sizeof(LONGLONG); i++)
mystring[i] = ((value >> (sizeof(LONGLONG) - i - 1)) & 1) ? _T('1') : _T('0');
mystring[sizeof(LONGLONG)]='\0';
AfxMessageBox(mystring);
}

And the answer is 11 11 11 11
Instead od a 64 times '1'.
Where the rest has gone ?

Re: LONGLONG

Joel Holdsworth12-Apr-05 0:30

Joel Holdsworth

12-Apr-05 0:30

Read this[^], and see my update original code at the bottom of the tree: http://www.codeproject.com/script/comments/forums.asp?msg=1081046&forumid=1647#xx1081046xx[^]

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

Re: LONGLONG

fardak12-Apr-05 0:42

fardak

12-Apr-05 0:42

Thank you for yor time and effort.
I tried you edited code with a value of
0xFF FF FF FF FF FF FF FF (//16 F)
and it gives 64 1's which is the correct answer .
Thanks again.

Re: LONGLONG

Joel Holdsworth12-Apr-05 0:50

Joel Holdsworth

12-Apr-05 0:50

Phew finally - I'm being a donkey today D'Oh! | :doh:

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

Re: LONGLONG

toxcct12-Apr-05 0:14

toxcct

12-Apr-05 0:14

hum, well, it seems that the code is printing only the LSB and is missing the 0b 00110000 00111001

did you try my code ?

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

Re: LONGLONG

fardak12-Apr-05 0:35

fardak

12-Apr-05 0:35

Not yet,but I will and tell you about it.
Right now my head is spinning..dangerously!!

Re: LONGLONG

fardak12-Apr-05 1:59

fardak

12-Apr-05 1:59

Thanks for the code you supplied.
I tried the one given by Joel Holdsworth,and it works perfectly well.
Here's the final version.
void CMyBitsDlg::ConvertLLtoBin()
{
LONGLONG value = 0xFFFFFFFFFFFFFFFF;//16 F
TCHAR mystring[sizeof(LONGLONG)*8 + 1];
for(int i = 0; i < sizeof(LONGLONG)*8; i++)
mystring[i] = ((value >> (sizeof(LONGLONG)*8 - i - 1)) & 1) ? _T('1') : _T('0');
mystring[sizeof(LONGLONG)*8] = 0;
AfxMessageBox(mystring);
}
The result is a 64 1's.

Re: LONGLONG

Joel Holdsworth12-Apr-05 0:26

Joel Holdsworth

12-Apr-05 0:26

I'm so sorry to mess you around fardak! I'm really not thinking properly today! The problem is that sizeof(LONGLONG) is in bytes not bits. Change every reference to sizeof(LONGLONG) to sizeof(LONGLONG)*8, and everything should work out!

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

b+ tree implementation in c

chaitanyajonnalagadda11-Apr-05 21:18

chaitanyajonnalagadda

11-Apr-05 21:18

i tried to implement but i couldn't .i hope anyone could help me before 20 of this month

Automated building

JensB11-Apr-05 20:53

JensB

11-Apr-05 20:53

Hi,

I have alot of MFC and C++ Console applications & static library's.
I build all applications on Windows OS & main applications (console) on Linux (gcc gmake).

Which program do you guys advise to use to automated building so I can do building easily on Win & Linux? ant? Scons?
I realise this is not a general C++ question, but since you guys alsoo waste a lot of time building apps maybe anyone could give me some tips ..

Greetings,
Jens

Re: Automated building

CP Visitor12-Apr-05 4:47

CP Visitor

12-Apr-05 4:47

JensB wrote:
Which program do you guys advise to use to automated building so I can do building easily on Win & Linux? ant? Scons?

gmake[^] is available for Linux and Windows Smile | :)

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