Re: Mathematics question - C / C++ / MFC Discussion Boards

Arrun13-Jan-05 1:18

13-Jan-05 1:18

Hi I am doing a project in MFC which uses three MDI child windows, When i use the MDITile command, the frist opened window moves to the last but i want the windows to arrange the other way. Can anyone help me in sorting this problem?

Re: Z order

Shog⁹13-Jan-05 11:51

Shog⁹

13-Jan-05 11:51

SetWindowPos() can be used to change the Z-order of a window. I'm not sure what method MDITile uses to enumerate windows, but i would try this first.

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Bitmap Picking and Moving

masd7913-Jan-05 0:56

masd79

13-Jan-05 0:56

Hello,

After drawing bitmaps, i want to implement a functionality like picking a bitmap with mouse and moving it some other position on the client area (dragging it).

Any help?

Re: Bitmap Picking and Moving

KaЯl13-Jan-05 4:44

KaЯl

13-Jan-05 4:44

I would try it to do it this way:

1) When clicking the left button, create a temporary CBitmap object, compatible with a memory DC. Using this memory DC, draw the wanted area on the CBitmap.
2) When moving the mouse
a) If the CBitmap was previously drawn, draw the CBitmap in its old position using a XOR mode (that is clearing the previous drawing)
b) draw the CBitmap in its new position in XOR mode
3) When releasing the left button: clearing the drawing of the CBitmap object in its old position ( = drawing in XOR mode), update the data, delete the temporary CBitmap object, redraw the window.

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Mathematics question

Rassul Yunussov13-Jan-05 0:04

Rassul Yunussov

13-Jan-05 0:04

Whell, i'll try to explain what really i want:
I got to two OXY scales, (two dimensions). So One OXY, and another O'X'Y'. The first is local coordinate system and the second is real (global) coordinate system. I Got three equivalent points in that systems. So how to get know the position on the area, using this three point, and create projection to the real( global) coordinate system? I hope i explained it corectly. In other words i got the GPS,and the Map in Local coordinate systems, and i want to translate the data from gps, to set the point on the map correctly.... Ufff, i have to learn english better....
Please Help...

Re: Mathematics question

Selvam R13-Jan-05 0:15

Selvam R

13-Jan-05 0:15

Hi,

you will search DC related information.

Find information about SetWindowOrg http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_clistbox.3a3a.getsel.asp[^] and SetViewportOrg function,http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_clistbox.3a3a.getsel.asp[^]

Regards,
Selvam

Re: Mathematics question

Iain Clarke, Warrior Programmer13-Jan-05 5:16

Iain Clarke, Warrior Programmer

13-Jan-05 5:16

I had a similar problem a couple of years ago.

I ended up learing a lot of matrix & vector maths I'd forgotten about years previously.

But that was transforming points from one coordinate system to another, with O'X' and O'Y'
not necessarily orthogonal (at 90<super>o).

But if your coordinate systems are parallel, and you want to go from one system to another...
Transforming point P...

P1 = P - O
P1.x /= (OX).x
P1.y /= (OX).y
P2.x *= (O'X').x
P2.y *= (O'X').y
P' = P2 + O'

I ended up with my own matrix & vector classes, with a function that took 3 coords in one
system (O,X,Y), 3 in the next (O',X',Y') and produced a matrix to transform between them:
M = dxfMatrix::Warp(A,B,C, A',B',C')
P' = MP
But its not publishable! Maybe this counts as teasing...

If you need any specific help, let me know.

Iain.

Re: Mathematics question

Rassul Yunussov18-Jan-05 19:59

Rassul Yunussov

18-Jan-05 19:59

Hello, I think you understand me right Smile | :)

Thanks

"that was transforming points from one coordinate system to another, with O'X' and O'Y'
not necessarily orthogonal (at 90o)" - That's exactly what i need!!!
The transforming point from one system to another, with three or more controll points. Where can i find the formulas or something,or open source or any information

Re: Mathematics question

Iain Clarke, Warrior Programmer18-Jan-05 22:50

Iain Clarke, Warrior Programmer

18-Jan-05 22:50

Rassul Yunussov wrote:
Where can i find the formulas or something,or open source or any information

Well, I had to struggle a lot, against a lack of information. I can't email you the
code, as it is too entangled in commercial stuff & confidential. Sounds like an
article needing to be written!

If you want a head start, I would go start learning about matrices again...

Eigen Vectors[^].

Iain.

Push Button Properies-Icon prompt?

José Luis Sogorb12-Jan-05 23:57

José Luis Sogorb

12-Jan-05 23:57

Hi:
if I have defined a push button as an Icon is there any way to show an info prompt when I put the mouse over this button?
Thanks.

Re: Push Button Properies-Icon prompt?

Selvam R13-Jan-05 0:05

Selvam R

13-Jan-05 0:05

Hi,

This Codeproject article explain the customized button with Tooltips.

http://www.thecodeproject.com/buttonctrl/CustomBitmapButtonDemo.asp[^]

Regards,
Selvam

Re: Push Button Properies-Icon prompt?

José Luis Sogorb13-Jan-05 23:18

José Luis Sogorb

13-Jan-05 23:18

Thank you, I also have found a good article:
http://www.codeproject.com/buttonctrl/tooltipressourcebutton.asp

reading from serial port

doneirik12-Jan-05 23:37

doneirik

12-Jan-05 23:37

Hi,

OS:Win2000
using VC++ .NET 2003

I have some sample code (from msdn) to read and write to the serial port. The code works perfectly when I put it into a console program. However, when I put excactly the same code into an Windows Form Application the program "hangs" at the reading routines. Do other reading routines apply to Windows Forms Applications? I simply can´t understand why it doesn´t work...

BYTE Byte;<br />
DWORD dwBytesTransferred;<br />
<br />
// Specify a set of events to be monitored for the port.<br />
SetCommMask (hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);<br />
<br />
while (hPort != INVALID_HANDLE_VALUE) <br />
{<br />
  // Wait for an event to occur for the port.<br />
  WaitCommEvent (hPort, &dwCommModemStatus, 0);<br />
<br />
  // Re-specify the set of events to be monitored for the port.<br />
  SetCommMask (hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING);<br />
<br />
  if (dwCommModemStatus & EV_RXCHAR) <br />
  {<br />
    // Loop for waiting for the data.<br />
    do <br />
    {<br />
      // Read the data from the serial port.<br />
      ReadFile (hPort, &Byte, 1, &dwBytesTransferred, 0);<br />
<br />
      // Display the data read.<br />
      if (dwBytesTransferred == 1)<br />
        this->label1->Text = S"string";<br />
<br />
    } while (dwBytesTransferred == 1);<br />
  }

Re: reading from serial port

Blake Miller13-Jan-05 4:38

Blake Miller

13-Jan-05 4:38

Your main thread is blocking on the WaitCommEvent.
Typically, code like this would be placed into a separate tread where it would not interfere with the processing of other information, such as mouse movements, painting, keyboard events, etc.

how to get a running application

spiced12-Jan-05 23:31

spiced

12-Jan-05 23:31

i already stored the name of the active window processes inside a listbox..how do i get to select and show the process that was selected?

about C++ and MFC

Re: how to get a running application

Selvam R12-Jan-05 23:42

Selvam R

12-Jan-05 23:42

Hi,

Did you mean how to select Items from the list box?

Use CListBox::GetSel function to select the current item in the list box. If you want get all the item selected from list box, you get the total number of counts use GetCount function and check all the items is whether select or not

Regards
Selvam

Re: how to get a running application

spiced13-Jan-05 0:16

spiced

13-Jan-05 0:16

nope..what i meant is that after selecting the particular name in the listbox, i would like open the corresponding application that coincides with the name...

i used enumwin() to get the running application process and store its name to the listbox...but how can i show the window that corresponds to the application name selected?

about C++ and MFC

Re: how to get a running application

ThatsAlok13-Jan-05 0:51

ThatsAlok

13-Jan-05 0:51

While Enumeration of Window Store the Name of Window along with corresponding HWND or HANDLE.
when User select the Window to close just search the your local array for handle and send Close Message.

Hope you understand this

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Re: how to get a running application

spiced13-Jan-05 17:07

spiced

13-Jan-05 17:07

Thanks!but can i have a sample code of the array...here's how i stored the values
::enumwndfn(CWnd * wnd)
{CString s;
wnd->GetWindowText(s);
m_TaskList.AddString(s);
}

Bool CALLBACK CDlg::enumwndfn(HWND hWnd, LPARAM lParam)
{
CDlg* me = (CDlg *)lParam;
return me->enumwndfn(CWnd::FromHandle(hWnd));
}

called by : EnumWindows(enumwndfn, (LPARAM)this);

Thanks!

about C++ and MFC

Re: how to get a running application

ThatsAlok13-Jan-05 18:47

ThatsAlok

13-Jan-05 18:47

Do this thing

I think you m_TaskList is type CStringArray change it to CPtrArray.

and Create a Struct

struct MyArry
{
CString WindowName;
CWnd Wnd;
};

and Instead

spiced wrote:
::enumwndfn(CWnd * wnd)
{CString s;
wnd->GetWindowText(s);
m_TaskList.AddString(s);
}

use this thing

::enumwndfn(CWnd * wnd)
{
 CString s;
//get Window name
 wnd->GetWindowText(s); 

//declare Variable of MyArry
 MyArry tmp;
//Store Window name
 tmp.WindowName=s;
 tmp.Wnd=*wnd;

//Store it in Array
 m_TaskList.add(tmp);

}

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Application fails in Release mode....

Jagadeesh VN12-Jan-05 23:27

Jagadeesh VN

12-Jan-05 23:27

Hi,

I developed an application in VC++, and it is crashing in the release mode.I enabled Debbuging in the release mode, and I hv attached the dump of my Call Stack.

I dont know, why CWinApp object is NULL.Can anybody pl. help me in solving this...

TBMS3! __sbh_free_block + 369 bytes
TBMS3! free + 35 bytes
operator delete(void * 0x0145c030) line 349 + 9 bytes
CPlex::FreeDataChain(CPlex * const 0x00000000) line 45 + 6 bytes
CMapPtrToPtr::RemoveAll(CMapPtrToPtr * const 0x00000000 {CMapPtrToPtr}) line 94
CHandleMap::DeleteTemp(CHandleMap * const 0x00000000) line 239 + 8 bytes
AfxUnlockTempMaps(int 1) line 50
CWinThread::OnIdle(CWinThread * const 0x00000000 {CWinThread h=??? proc=???}, long 5120804) line 591
CWinApp::OnIdle(CWinApp * const 0x00000000 {CWinApp ???}, long) line 494

Also, earlier it was giving errors related to vector destructor iterator.
Wherever I used delete [] ptr, the application was failing. Even though I am not using delete [] from within my code, the MFC framework is using that a lot. Is there any way by which I can force the compiler to include vector destructor, and scalar destructor.

I am working in VC++ 6.0

--Rgds--

Re: Application fails in Release mode....

PJ Arends13-Jan-05 6:55

PJ Arends

13-Jan-05 6:55

A must read article:
http://www.codeproject.com/debug/survivereleasever.asp[^]

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"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Thanks Blake Miller: CreateProcess and process groups (2)

ionzarate12-Jan-05 23:16

ionzarate

12-Jan-05 23:16

Hello everybody!

First of all, thanks for your answer Blake Miller!!!

I didn´t explain the situation correctly.
I mixed up with the example!!
Sigh | :sigh:

I´ll try to explain it correctly...

I´m using CreateProcess to create a new process, with the
CREATE_NEW_PROCESS_GROUP flag set in the argument "dwCreationFlags",
to create a new process group.

Let´s suppose that PROCESS_A creates a new process,
with CREATE_NEW_PROCESS_GROUP flag set. This new created
process (PROCESS_B) is the 1º process of the process group.

It´s true that both the 1º process of a process group and
the process group itself have the same ID. So the ID of
the process group and the PID of PROCESS_B are the same.

If the PROCESS_B creates a new process (PROCESS_C) with
CREATE_NEW_PROCESS_GROUP flag cleared, both PROCESS_B
and PROCESS_C will belong to the same group.

PROCESS_B knows the ID of its process group, as it´s
its own PID. But...

-How can PROCESS_C get the process group ID?
(without using IPC or passing it through command line
arguments)

-Is there any function which returns the process group ID
of the calling process?

Summing up...
I only what to know how to get the ID of the process
group, to which a process belongs.

Thanks and bye.
Smile | :)

Get Sector!! !!

LiYS12-Jan-05 22:57

LiYS

12-Jan-05 22:57

Hi all:

How can I get specific folder's sector position?

Re: Get Sector!! !!

Selvam R12-Jan-05 23:06

Selvam R

12-Jan-05 23:06

Hi,

Try the following link.
http://www.codepedia.com/zone5/cat469/15842.htm[^]>]

With Regards,
Selvam

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