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Re: What does 'handle' mean ?

Fazlul Kabir8-Oct-01 9:38

Fazlul Kabir

8-Oct-01 9:38

The issue is related to permanent / temporary handle mapping in MFC's CWnd class. This is a complex subject and so it's easy to get confused. Here is a MSJ/97 article on this subject that you may find useful:

http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0997/c++0997.htm&nav=/msj/0997/newnav.htm

Hope this helps.

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

Re: What does 'handle' mean ?

Ravi Bhavnani8-Oct-01 9:57

Ravi Bhavnani

8-Oct-01 9:57

In general, a handle is just a 32-bit key to a data structure maintained by Windows. Some common handles are:

HACCEL - Handle to an accelerator table.
HANDLE - Handle to an object.
HBITMAP - Handle to a bitmap.
HBRUSH - Handle to a brush.
HCOLORSPACE - Handle to a logical color space.
HCONV - Handle to a dynamic data exchange (DDE) conversation.
HCONVLIST - Handle to a DDE conversation list.
HCURSOR - Handle to a cursor.
HDC - Handle to a device context (DC).
HDDEDATA - Handle to DDE data.
HDESK - Handle to a desktop.
HDROP - Handle to an internal drop structure.
HDWP - Handle to a deferred window position structure.
HENHMETAFILE - Handle to an enhanced metafile.
HFILE - Handle to a file opened byOpenFile, notCreateFile.
HFONT - Handle to a font.
HGDIOBJ - Handle to a GDI object.
HGLOBAL - Handle to a global memory block.
HHOOK - Handle to a hook.
HICON - Handle to an icon.
HIMAGELIST - Handle to an image list.
HIMC - Handle to input context.
HINSTANCE - Handle to an instance.
HKEY - Handle to a registry key.
HKL - Handle to a keyboard layout.
HLOCAL - Handle to a local memory block.
HMENU - Handle to a menu.
HMETAFILE - Handle to a metafile.
HMODULE - Handle to a module.
HMONITOR - Handle to a display monitor.
HOOKPROC - Pointer to an application-defined hook function specified toSetWindowsHookEx.
HPALETTE - Handle to a palette.
HPEN - Handle to a pen.
HRGN - Handle to a region.
HRSRC - Handle to a resource.
HSZ - Handle to a DDE string.
HTREEITEM - Handle to an item in a tree-view control.
HWINSTA - Handle to a window station.
HWND - Handle to a window.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

'FlexGrid Control'

Ahmad8-Oct-01 7:23

Ahmad

8-Oct-01 7:23

HI
I use (Microsoft FlexGrid Control, version 6.0) which is active x control .It’s very useful, but some member functions are unclear .
Now I’m interested in how useing three functions and maybe they will be the keys of the rest functions .
1 – void AddItem(LPCTSTR Item, const VARIANT& index)
to add new rwo BUT HOW???
2 - long GetRowData(long index)
to get data from specific row BUT HOW???
3- How can I get data from multi row selection ?

Thank you very much …

AHMAD ALWASHALI

Re: 'FlexGrid Control'

8-Oct-01 7:39

Read the help file, boy. It is the file

c:\Winnt\Help\MsFlxGrd.hlp

or

c:\Windows\Help\MsFlxGrd.hlp

Best way to kill / close an app

RobJones8-Oct-01 6:00

RobJones

8-Oct-01 6:00

Hello,
I have a dialog type app, I use a minimize to system tray class that puts the icon to the system tray.. When I close the app the icon is still visible until I pass the mouse over it, then it goes away.. What's the best way to kill the app so it removes all traces from the system.. Right now I just do a OnOK();

Rob

Re: Best way to kill / close an app

Fazlul Kabir8-Oct-01 6:42

Fazlul Kabir

8-Oct-01 6:42

Can you please tell more on how you close the app while it's in minimized state? (sending a message from somewhere else?)

Generally speaking, there are a few SDK functions that are used to terminate Win32 apps explicitly.

(1) ::TerminateProcess(HANDLE hProc);
(2) ::PostQuitMessage(WM_QUIT);

See MSDN documentation to find more..

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

Re: Best way to kill / close an app

Ravi Bhavnani8-Oct-01 7:09

Ravi Bhavnani

8-Oct-01 7:09

The system tray icon will hang around until you remove/destroy it. When your app exits, you should remove/destroy the systray icon.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Best way to kill / close an app

Michael Dunn8-Oct-01 8:22

Michael Dunn

8-Oct-01 8:22

When I close the app the icon is still visible until I pass the mouse over it,

That's because you're not calling Shell_NotifyIcon() to remove the tray icon before your app exits.

--Mike--
http://home.inreach.com/mdunn/
"The Earth is doomed." -- Rupert Giles
Heart | [heart]

your

with

and

Re: Best way to kill / close an app

8-Oct-01 14:53

I feel dumb Blush | :O

... that worked like a charm.

Thanks!

Rob

Wait for Read()

kakuni8-Oct-01 5:55

kakuni

8-Oct-01 5:55

I was wondering, is there a way to wait for a single process to complete with out using treads? I am reading data from a serial port at a low baud rate, and before the read is complete my program cuts it off and starts processing the data. Any help is appreciated.

Thanks.

Re: Wait for Read()

Tomasz Sowinski8-Oct-01 7:31

Tomasz Sowinski

8-Oct-01 7:31

I'm not sure what do you mean by 'process' in your post. Is that just some activity of your program, like reading from serial port, or OS object created with a call to CreateProcess?

Tomasz Sowinski -- http://www.shooltz.com

Re: Wait for Read()

kakuni8-Oct-01 7:42

kakuni

8-Oct-01 7:42

What I mean by process is the read... When I do my read call, before the read has finished reading all the data it is supposed to, my program is already trying to use that data... this results in data being lost or corrupted. Is there anyway to wait for the read to finish and then when it is done, continue the program?

Re: Wait for Read()

Tomasz Sowinski8-Oct-01 8:45

Tomasz Sowinski

8-Oct-01 8:45

Is there anyway to wait for the read to finish and then when it is done, continue the program?

How do you read the bytes from the serial port?

Tomasz Sowinski -- http://www.shooltz.com

Re: Wait for Read()

kakuni8-Oct-01 9:16

kakuni

8-Oct-01 9:16

I connected to the serial port like this...

hCommPort = CreateFile( "COM1",GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

then I read like this...

ReadFile (hCommPort, buffer, 8, &dwBytesTransferred, NULL);

Re: Wait for Read()

Tomasz Sowinski8-Oct-01 9:23

Tomasz Sowinski

8-Oct-01 9:23

So ReadFile returns an error and exits prematurely? You're not using overlapped I/O - there's no FILE_FLAG_OVERLAPPED flag in the call to CreateFile.

Tomasz Sowinski -- http://www.shooltz.com

Re: Wait for Read()

kakuni8-Oct-01 9:32

kakuni

8-Oct-01 9:32

No, there is not an error... It just reads and continues, but the read is not finished when it goes on... I have put a Sleep(500) after the read, and it then works correctly, but I know that this is not a good approach.

Re: Wait for Read()

Tomasz Sowinski8-Oct-01 9:38

Tomasz Sowinski

8-Oct-01 9:38

ReadFile returns TRUE, but the number of bytes read is less than 8?

Tomasz Sowinski -- http://www.shooltz.com

Re: Wait for Read()

kakuni8-Oct-01 9:41

kakuni

8-Oct-01 9:41

Yes, that is correct. It is sometimes 8, and sometimes less. Also when it is less than 8 there is sometimes garbage symbols there as well.

Re: Wait for Read()

Tomasz Sowinski8-Oct-01 9:55

Tomasz Sowinski

8-Oct-01 9:55

Strange, but probably true. I'm giving up - sorry.

Tomasz Sowinski -- http://www.shooltz.com

Re: Wait for Read()

kakuni8-Oct-01 9:58

kakuni

8-Oct-01 9:58

That's ok, thanks for your time.

Re: Wait for Read()

Bill Wilson8-Oct-01 11:53

Bill Wilson

8-Oct-01 11:53

I think I understand the problem...

You are getting all the bytes available at the time of the call, up to the requested MAXIMUM. Put the read in a loop, with a Sleep. It doesn't have to be long... Keep looping until you have read all the bytes you want.

Bill

Re: Super Class

C^hris L^osinger8-Oct-01 5:30

C^hris L^osinger

8-Oct-01 5:30

is the superclass (base class) destructor "virtual" ?

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: Super Class

Ray Kinsella8-Oct-01 5:32

Ray Kinsella

8-Oct-01 5:32

figured it out
thx

Regards

Ray

"Je Suis Mort De Rire"

Winsock 2.0

Anders Molin8-Oct-01 4:48

Anders Molin

8-Oct-01 4:48

Is Winsock 2.0 included in Windows 95 and 98?

I cannot find it anywhere in MSDN Frown | :(

If not, is it possible to install Winsock 2.0 on Windows 95/98?

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Winsock 2.0

Masaaki Onishi8-Oct-01 6:33

Masaaki Onishi

8-Oct-01 6:33

Hello, the codegurus around the world.;)

Windows 95 doesn't have WinSock2.0, but Windows 98 have WinSock2.0.

WS2_32.dll is a key DLL in the system directory if WinSock2 exists.
We can install WinSock2.0 to Windows 95, but there are some bugs like
FrontPage TCP/IP configuration.

You will find some ws2setup.exe in MSFT home page to install WinSock2.0.

Have a nice day!

-Masaaki Onishi-

Last Visit: 31-Dec-99 18:00 Last Update: 4-Jun-24 0:20

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