C / C++ / MFC

12-Apr-05 9:10

I tried everything honestly. Nothing works!

I hope its not a hardware instruction set problem!

Ganesh

Ganesh_Srim12-Apr-05 9:26

12-Apr-05 9:26

I tried all your suggestions. But nothing worked.
The next thing I should suspect is some hardware instruction set bug!!

When I worked in Linux long time ago, I did not seem to encounter this problem!

Is there any way I can contact Micorsoft's personnel without having to purchase a subsciption.

I can't imagine programming without these constructs. But it is possible with virtual base classes containg the same data structure. Thus one ends up always using derived types when such a class is needed in a "cicular" way.

Ganesh

Rick York12-Apr-05 9:48

Rick York

12-Apr-05 9:48

I made this little test program and it compiled and worked :

#include "stdafx.h"

class Point3D; // Forward Declaration of class Point3D defined below.

class Point2D
{
public:
    int i, j;
    Point2D()                { Set( 0, 0 ); }
    Point2D(int a, int b)    { Set( a, b ); }
    void Set( int a, int b ) { i = a; j = b; }
    __inline void projectFrom(Point3D *p3d);
};

class Point3D
{
public:
    int i, j, k;
    Point3D()                              { Set( 0, 0, 0 ); }
    Point3D(int a, int b, int c)           { Set( a, b, c ); }
    Point3D& operator=(const Point2D& p2d) { Set( p2d.i, p2d.j, 0 ); }
    void Set(int a, int b, int c)          { i = a; j = b; k = c; }
};


void Point2D::projectFrom(Point3D *p3d)
{
    i = p3d->i;
    j = p3d->j;
}


////////////////////////////////////////////////////


int main()
{
    Point2D p2d(1,2);
    Point3D p3d(2,3,4);
    p2d.projectFrom( &p3d );
    fprintf( stdout, "p2d = (%d, %d)\n", p2d.i, p2d.j );
    return 0;
}

CP Visitor12-Apr-05 22:55

CP Visitor

12-Apr-05 22:55

Rick York wrote:
void Point2D::projectFrom(Point3D *p3d)

... written below the class definition Laugh | :laugh:

;)

Ganesh_Srim12-Apr-05 23:17

12-Apr-05 23:17

Hello CP Visitor.

You are right from the beginning. I misread the compiler remarks
as I put all function code in one line. Had I put those assigments on a
separate line, I would have at least undetstood that there is no
problem with forward referencing, but something else. I would have saved you all some time.

Thanks.

Ganesh

Ganesh_Srim12-Apr-05 23:12

Re: ForwardReferencing in VC++ 6.0: Resolved! Thanks All

12-Apr-05 23:12

Hello 'Rick York'

Thanks for your time. Just before checking for messages,
I got it right finally. You are absolutely right. Since I put all
the code in one line, I could not decipher compiler message clearly.
Had I put the assignment code

<br />
{i = p3d.i; j = p3d.j; }

on a different line, I would have saved myself and all of you so much time.

My apologies.

Ganesh

Ganesh

Ganesh_Srim12-Apr-05 23:21

12-Apr-05 23:21

Hello All,

I finally I uderstood the issue. Thanks everybody.

Ganesh

Notify Change

sunit511-Apr-05 23:25

sunit5

11-Apr-05 23:25

i used FindFirstChangeNotification()FindFirstChangeNotification()AND WaitForSingleObject() to notify any change in a mentioned directory.its working.But i want to mention the cause of notification (say its due to deletion of a file).i declared every filter condition in FindFirstChangeNotification()

ThatsAlok11-Apr-05 23:45

ThatsAlok

11-Apr-05 23:45

Actaully What type of of problem are you facing sir!

[Vote One Here, Complete my Survey....]

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

"I ~~Think~~ Believe this Will Help"

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

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[^]

[Vote One Here, Complete my Survey....]

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

"I ~~Think~~ Believe this Will Help"

sunit512-Apr-05 0:57

sunit5

12-Apr-05 0:57

THANKS ALOK

LONGLONG

fardak11-Apr-05 22:07

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[^]

fardak11-Apr-05 23:22

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?

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]

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

Wanna give me a job this summer?
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]

fardak11-Apr-05 23:42

11-Apr-05 23:42

Thank you.
Pls read my reply to Joel Holdsworth.

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]

fardak12-Apr-05 0:05

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.

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[^]

fardak12-Apr-05 0:26