C / C++ / MFC

16-May-06 18:36

In my application, I dynamically set the parent of my custom child control to Desktop Window. Now I don't get the keyboard messages in PreTranslateMessage of my control, because the keyboard focus is still in the main application...

BOOL CMyCtrl::PreTranslateMessage( MSG* pMsg_i )
{
    if(( pMsg_i->message >= WM_KEYFIRST ) && ( pMsg_i->message <= WM_KEYLAST ))
    {
        ProcessKeyStroke();
    }
    return CWnd::PreTranslateMessage( pMsg_i );
}

I cannot change the focus from application to the control because it's a must. Is there anyway to watch the key strokes in this condition?
( Please don't tell me about hook Wink | ;)

)

Thank you.

- NS -

Nibu babu thomas16-May-06 18:49

16-May-06 18:49

Did you try sending a copy of the message to the control from your dialog or frame which houses the control (SendMessage, PostMessage).

Nibu thomas
Software Developer

Faqs by Michael dunn

Nishad S16-May-06 18:54

16-May-06 18:54

I think that is a last resort... !
As this control is supposed to be a common, I need to avoid such dependencies.

- NS -

Nibu babu thomas16-May-06 18:59

16-May-06 18:59

NS17 wrote:
I think that is a last resort... !
As this control is supposed to be a common, I need to avoid such dependencies.

Well that is how keyboard messages are set to function. If a control is to receive input from keyboard it should have the Input Focus. This the rule. You cannot break that. Smile | :)

Nibu thomas
Software Developer

Faqs by Michael dunn

Nishad S16-May-06 19:06

16-May-06 19:06

mmm....
So now I am planning to expose a function to allow the app to call in its PreTranslateMessage, like the RelayEvent() of ToolTip Ctrl. What's your opinion?

- NS -

Nibu babu thomas16-May-06 19:17

16-May-06 19:17

NS17 wrote:
So now I am planning to expose a function to allow the app to call in its PreTranslateMessage, like the RelayEvent() of ToolTip Ctrl. What's your opinion?

Well if you want such functionality that's an option. You can also take look at the FORWARD_WM_********* group of macros which could also help you.

Nibu thomas
Software Developer

Faqs by Michael dunn

Nishad S16-May-06 19:21

16-May-06 19:21

Ok, thank you... Let me try Smile | :)

- NS -

CArray memory issue

mohanrajh16-May-06 18:15

mohanrajh

16-May-06 18:15

Hey guys,
I would like to know what happends with memory in this code,

CArray<int,int> myArray;

//my array could be 0 or can grow upto 1000
myArray.SetSize(0,1000);

for (int j = 0; j < 900; j++)
{
myArray.Add(j);
}

//what is below line going to do?
myArray.FreeExtra();

Is SetSize & FreeExtra functions anyway improves anything here or it would be better of without these lines.
Thanks

Mohan

Christian Graus16-May-06 18:24

Christian Graus

16-May-06 18:24

http://www.google.com.au/search?hl=en&q=CArray+FreeExtra&meta=[^]

FreeExtra apparrenty will free any memory allocated, but I would guess what it does depends on the classes grow policy, no memory was pre allocated.

std::vector is a far better container to use than CArray.

Christian Graus - Microsoft MVP - C++

NiceNaidu16-May-06 18:36

NiceNaidu

16-May-06 18:36

CArray<CPoint,CPoint> myArray;<br />
int i;<br />
<br />
// Allocate memory for at least 32 elements.<br />
myArray.SetSize(32, 128);<br />
<br />
// Add elements to the array.<br />
CPoint* pPt = (CPoint*) myArray.GetData();<br />
for (i=0;i < 32;i++,pPt++)<br />
   *pPt = CPoint(i, 2*i);<br />
<br />
// Only keep first 5 elements and free extra (unused) bytes.<br />
myArray.SetSize(5, 128);<br />
myArray.FreeExtra();

Look at the above code .

Hope now u can understand the use of FreeExtra.

Appu..
"If you judge people, you have no time to love them."

Laxman Auti16-May-06 18:29

Laxman Auti

16-May-06 18:29

HI Mohan,
function FreeExtra():

Frees any extra memory that was allocated while the array was grown. This function has no effect on the size or upper bound of the array

function SetSize():

Use this function to set the size of your array before you begin using the array. If you do not use SetSize, adding elements to your array causes it to be frequently reallocated and copied. Frequent reallocation and copying are inefficient and can fragment memory

...referenced from MSDN oct 2001

Knock out 'T' from CAN'T ,
You 'CAN' if you think you 'CAN'
Cool | :cool:

grigsoft16-May-06 19:08

grigsoft

16-May-06 19:08

With SetSize your code runs faster - memory for 1000 items is allocated and not copied\extended during adding new items. Without it array will allocate new memory several times, copying all items to new location.
FreeExtra just free unused memory - but it have to copy whole array to new location, which cost time. So I almost never use it - if you will want to add new item afterwards, you will cause array to copy items again.

Igor Green
http://www.grigsoft.com/ - files and folders comparison tools

mohanrajh17-May-06 15:08

mohanrajh

17-May-06 15:08

Igor,

I kinda got a clue, thanks. But i got a question...

I load the array only once when my application loads & then i just use it for reference purpose only, in this case if i include SetSize(0,1000) & the array loads only 500 items, will that mean the memory for other 500 still exists & not released?

Thanks.

Mohan

grigsoft17-May-06 20:55

grigsoft

17-May-06 20:55

Yes, that's true.

Igor Green
http://www.grigsoft.com/ - files and folders comparison tools

string..

Prinz Ryoiji16-May-06 18:08

Prinz Ryoiji

16-May-06 18:08

can anyone teach me how to get string input and display it in the blackbox?

fe8her

Nibu babu thomas16-May-06 18:10

16-May-06 18:10

Prinz Ryoiji wrote:
it in the blackbox?

Is this a Console Application? Unsure | :~

Nibu thomas
Software Developer

Faqs by Michael dunn

Prinz Ryoiji16-May-06 18:17

Prinz Ryoiji

16-May-06 18:17

yupe..
win32 console application..

Nibu babu thomas16-May-06 18:24

16-May-06 18:24

That blackbox is called console.

Well I wrote an example for you and then I lost the whole thing (Page cannot be displayed).

Well CG has done that for you...

Nibu thomas
Software Developer

Faqs by Michael dunn

Prinz Ryoiji16-May-06 18:33

Prinz Ryoiji

16-May-06 18:33

owh..ok..

thanks...