C / C++ / MFC Discussion Boards

Re: managing serial port interrupt

Rage30-Jan-06 5:00

Rage

30-Jan-06 5:00

Ever considered using this:

http://www.codeproject.com/system/cserialport.asp[^]

~RaGE();

Re: managing serial port interrupt

misturas30-Jan-06 5:06

misturas

30-Jan-06 5:06

I use Visual C++ 6.0 and I studied the article "Serial Communications in Win32" of msdn
My question is a question my boss made me I know it's not very easy to interact with hardware at low level on Windows and all the articles I found uses overlapped operation and ReadFile/WriteFile to read/write COM ports
Now in Italy is 6 p.m., so I have to leave office Poke tongue | ;-P

Sorry if I don't reply immediately
Thanks in advance Wink | ;)

Re: managing serial port interrupt

Rage30-Jan-06 5:16

Rage

30-Jan-06 5:16

misturas wrote:
Now in Italy is 6 p.m

Really ? I am sitting in Germany, and it is still 5 p.m. Did not know that Germany had a different time than Italy.

As for serial communication, there are lots of wrappers that consider the serial port as a file with read/write operation. This is very handy for serial communication, but not for your purposes. I think what you are looking for is a way to get the hand when a serial interrupt is called (as we used to do under DOS or on microcontrollers). I think this should be feasible with the API I have provided you with, in this case you must get a Windows message as soon as something lands on the serial buffer.

~RaGE();

Re: managing serial port interrupt

Cedric Moonen30-Jan-06 6:28

Cedric Moonen

30-Jan-06 6:28

Maybe it would help a lot if you describe exactly what you want to achieve. In general, reading and writing to a serial port can be done by several ways (specifically for reading). You can use a loop with timeouts (in a separate thread for example), ...
But if you want to really respond when there is an interuption, then you'll need to go for a device driver (and I suppose it must be tricky to do).

Anyway, even inside your driver, you will still have the problems of the real-time behavior, which is that Windows is not a real time operating system, so everything you want to achieve under the resolution of 10 msec (it can vary) is unfeasible.

Re: managing serial port interrupt

Iain Clarke, Warrior Programmer30-Jan-06 8:35

Iain Clarke, Warrior Programmer

30-Jan-06 8:35

If you want to be notified on receipt of a char, you can use overlapped I/O with your read. That way an Event will be signalled any time you receive a character.

You could put a receive loop in a separate thread, anf then post each characted received with a resgistered window message.

The choices may not be endless, but they are several!

Iain.

Re: managing serial port interrupt

misturas30-Jan-06 9:13

misturas

30-Jan-06 9:13

Ok, for rage, yes it was 5 p.m.
I know the way ReadFile Overlapped IO etc.
I was asking myself if there was a way of control interrupt the way dos/microcontroller do
I think the only suitable way is creating a device driver
It's better if re-study behavior of ReadFile,Events and Overlapped IO
Thanks to all Smile | :)

getting the hwnds of opened windows

Alex Cutovoi30-Jan-06 4:13

Alex Cutovoi

30-Jan-06 4:13

Hi fellows. I'm developing a program that returns the hwnd of all opened windows in the desktop. The problem is that function always returns 2 hwnd ID's. Can someone helps in this??

Thanks a lot...

void OpenedWindows(HWND hwnd)
{
HWND childWindow;
//is child of the desktop window???
if((childWindow = GetWindow(hwnd, GW_CHILD)) != NULL)
{
if(childWindow != NULL)
{
MessageBox(NULL, itoa(((int)childWindow), cVal, 10), "Is Child", MB_OK);
OpenedWindows(childWindow);
}
else
{
MessageBox(NULL, "No window child!!", "No Child", MB_OK);
}
}
else //Catch the next's window
{
childWindow = GetNextWindow(GetParent(hwnd), GW_HWNDNEXT);
if(childWindow != NULL)
{
MessageBox(NULL, itoa(((int)childWindow), cVal, 10), "Do Else", MB_OK);
OpenedWindows(childWindow);
}
else MessageBox(NULL, "Is NULL", "", MB_OK);
}
}

Re: getting the hwnds of opened windows

Rage30-Jan-06 4:50

Rage

30-Jan-06 4:50

void OpenedWindows(HWND hwnd)
{
   HWND childWindow;
   //is child of the desktop window???
   if((childWindow = GetWindow(hwnd, GW_CHILD)) != NULL)
   {
      if (childWindow != NULL)
      {
         MessageBox(NULL, itoa(((int)childWindow), cVal, 10), "Is Child", MB_OK);
         OpenedWindows(childWindow);
      }
      else
      {
         MessageBox(NULL, "No window child!!", "No Child", MB_OK);
      }
   }
   else //Catch the next's window
   {
      childWindow = GetNextWindow(GetParent(hwnd), GW_HWNDNEXT);
      if(childWindow != NULL)
      {
         MessageBox(NULL, itoa(((int)childWindow), cVal, 10), "Do Else", MB_OK);
         OpenedWindows(childWindow);
      }
      else MessageBox(NULL, "Is NULL", "", MB_OK);
   }
}

Why Getparent and not simply hwnd.

But anyway, I would not use clumsy recursion on the Z-order, but use GetDesktopWindow followed by EnumChildWindows, much more reliable IMO.

~RaGE();

Retreiving attributs of a node

kandukuri30-Jan-06 3:05

kandukuri

30-Jan-06 3:05

Hi all
can any one tell me how to retreive the attributes of a paticular node in a Tree Structure which is derived from CTreeCtrl ,if i know the handle of that particular node ,in MFC

Re: Retreiving attributs of a node

David Crow30-Jan-06 3:31

David Crow

30-Jan-06 3:31

Use the GetItem() method.

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

Re: Retreiving attributs of a node

kandukuri30-Jan-06 3:35

kandukuri

30-Jan-06 3:35

but what is the parameter for this GetItem( ) method

i ve Tree Structure as below
-Loop
-Slab=1
Slice=1
Slice =2
-slab=2
slice=1
slice=2

i want to explore all the items in a messageBox
( from Loop to slice=2)
for that one my code will be look like
for(i=0;i<(ptrTree->GetCount()); i++)

-- modified at 9:43 Monday 30th January, 2006

Re: Retreiving attributs of a node

Rage30-Jan-06 3:42

Rage

30-Jan-06 3:42

A pointer on a TVITEM structure. Here you go:

typedef struct tagTVITEM{
    UINT      mask;
    HTREEITEM hItem;
    UINT      state;
    UINT      stateMask;
    LPTSTR    pszText;
    int       cchTextMax;
    int       iImage;
    int       iSelectedImage;
    int       cChildren;
    LPARAM    lParam;
} TVITEM, FAR *LPTVITEM;

See MSDN for more info.

Typical code snippet:

TVITEM tvi;
ZeroMemory(&tvi,sizeof(tvi));
tvi.hItem = YourItemId;           // Here for the item id
tvi.mask = TVIF_TEXT |TVIF_STATE; // Here the attributes you want to retrieve

m_TreeCtrl.GetItem(&tvi);

// Now tvi is fulled with the item's attributes.

~RaGE();

Re: Retreiving attributs of a node

kandukuri30-Jan-06 3:57

kandukuri

30-Jan-06 3:57

Thanku rage

but i m getting an error of
GetItem cannot convert parameter 1 from 'struct myClass::MyFunction:tagTVITEM *' to 'struct tagTVITEMA *'

Re: Retreiving attributs of a node

Rage30-Jan-06 4:10

Rage

30-Jan-06 4:10

Can you post the part of the code where you are doing the call ? Are you using MFC ?

~RaGE();

Re: Retreiving attributs of a node

David Crow30-Jan-06 4:56

David Crow

30-Jan-06 4:56

You've erroneously made tagTVITEM part of your class, which is unnecessary.

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

Re: Retreiving attributs of a node

Rage30-Jan-06 5:10

Rage

30-Jan-06 5:10

Good point David, I missed the myClass::MyFunction. He must have misinterpreted my thread and define the TVITEM I gave as an example. Never give too much information Roll eyes | :rolleyes:

~RaGE();

Re: Retreiving attributs of a node

David Crow30-Jan-06 3:42

David Crow

30-Jan-06 3:42

kandukuri wrote:

but what is the parameter for this GetItem( ) method

A pointer to a TVITEM structure.

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

TDI

viliam30-Jan-06 2:45

viliam

30-Jan-06 2:45

Hi,
I am trying to do TDI hook driver, I just need to get notification, something like sysinternals.com TDIMon does.
I have no problem to get most of the TDI IRPs but
TDI_ACCEPT or TDI_SEND I never got..
Does anyone know what I am doing wrong?
What is special on this IRPs?
Thanx for help

viliam

Re: TDI

Toby Opferman30-Jan-06 8:16

Toby Opferman

30-Jan-06 8:16

You have implemented a filter driver on top of \Device\Tcp ? If you are on the top of the device stack you will get all the IRPs there is no special handling of those particular IRPs unless you are doing something different than I beleive you to be doing.

What Application are you attempting to filter that is not working correctly, have you verified that TDIMon is working correctly in the same situation? Also, there is a seperate device used by sockets which is \Device\Afd which I believe has a different interface than TDI. I believe there is an open source project which is a firewall that filters this interface for which you may be able to review (It also filters TDI) to find out this interface. I believe it is on sourceforge.

8bc7c0ec02c0e404c0cc0680f7018827ebee

Saving a BITMAP

spen1130-Jan-06 2:13

spen11

30-Jan-06 2:13

Hi all,

I have created a (very simple) bitmap editing program with a dialog based MFC project. Everything seems in order so far but I don't know how to save the HBITMAPs that I have created to file. I have tried using snippets of code from other examples but to no avail.

Any help would be much appreciated Big Grin | :-D

Re: Saving a BITMAP

Rage30-Jan-06 2:21

Rage

30-Jan-06 2:21

Is it not possible to serialize your bitmap ? Create a CBitmap from your handle HBITMAP using CBitmap::FromHandle, then Serialize it.

~RaGE();

Re: Saving a BITMAP

Vipin Aravind30-Jan-06 2:48

Vipin Aravind

30-Jan-06 2:48

If it is a DDB(device dependent bitmap) use GetDIBits(...) on the HBITMAP and get the
DIB with the format of your choice specified via the BITMAPINFO. Once got the DIB bits,
you can save to the file by putting the BITMAPFILEHEADER,BITMAPINFO and the bits itself
to a file in that sequence.

Vipin - MVP

Re: Saving a BITMAP

Laxman930-Jan-06 21:26

Laxman9

30-Jan-06 21:26

Here is the link of codeproject that may help you for saving the bitmap.

http://www.codeproject.com/bitmap/drawing2bitmap.asp

Thanks and Regards
Laxman

FAILURE is the first step towards SUCCESS Cool | :cool:

Wrong Colors

Great A'Tuin30-Jan-06 1:55

Great A'Tuin

30-Jan-06 1:55

hi,

strange problem with my colors: i want to display a tray icon but it always appears in black & white although the image HAS color. I've tried it with a 256 color bitmap, a 256 color icon, a 24 Bit color bitmap and a 24 Bit color icon (every variant with 16x16 Pixel) each time the same effect - JUST BLACK AND WHITE. Even with different functions for loading the images hasn't changed it. (tried LoadIcon, LoadImage and CreateIconIndirect )

any ideas what this may trigger ?

greets

Re: Wrong Colors

benjymous30-Jan-06 4:06

benjymous

30-Jan-06 4:06

Unless you're using Windows XP, tray icons always render using the standard 16 system colours, so you'll need to provide a 16 colour icon to stop it trying to convert it for you (which usually looks awful)

On XP, it renders the icons properly, using all available colours

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