C / C++ / MFC

managing serial port interrupt

30-Jan-06 4:54

eivanlo wrote:
Am I wrong?

Maybe. However, to be completely sure, I would not rely on the operator -- precedence in an assignment, (such as tar_row = --hrow;), but take two steps to do it (tar_row = hrow; hrow--;)

~RaGE();

misturas30-Jan-06 4:32

misturas

30-Jan-06 4:32

Hi to all,
I made a deep search in this and other sites about serial communications management in Win32 (Win9X,2000,XP)
All the results leads to using ReadFile and the other file-style functions
But is any way to use interrupts (int of received char) on Windows?Must I create a device drivers?
Thanks to all
Cristian

Rage30-Jan-06 4:59

30-Jan-06 4:59

misturas wrote:
ReadFile

Mmmh .. .really ? What are you trying to achieve exactely ?

~RaGE();

Cedric Moonen30-Jan-06 6:24

Cedric Moonen

30-Jan-06 6:24

Yes, sure. What is the problem with that ? Reading and writing data on the serial port is done with ReadFile and WriteFile.

Rage30-Jan-06 6:43

30-Jan-06 6:43

Hi Cedric,

I was doubting the fact that ReadFile and WriteFile was the _only_ method provided to read/write data under Windows. Not that it does not work.

~RaGE();

Rage30-Jan-06 5:00

30-Jan-06 5:00

Ever considered using this:

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

~RaGE();

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 | ;)

Rage30-Jan-06 5:16

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();

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.

Iain Clarke, Warrior Programmer

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

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.

getting the hwnds of opened windows

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 | :)

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

Retreiving attributs of a node

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();

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

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

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

Rage30-Jan-06 3:42

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();

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 *'

Rage30-Jan-06 4:10

30-Jan-06 4:10

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

~RaGE();

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

Rage30-Jan-06 5:10

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();