Re: reduce size of array - C / C++ / MFC Discussion Boards

Alexander ^M.,21-Jul-05 1:23

21-Jul-05 1:23

If possible, use stack memory instead of allocating. Then you don't have to care about size.

Don't try it, just do it! Wink | ;-)

Re: reduce size of array

Bob Stanneveld21-Jul-05 2:54

Bob Stanneveld

21-Jul-05 2:54

Why do you want to decrease the size of the buffer? You know that there are no easy ways to manipulate the size of an array! The only way to change the size of an array is to create a complete new one with the size you want and copy all the items you can from the old array..

As other users pointed out, you can use a std::vector or some other collection class.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: reduce size of array

David Crow21-Jul-05 3:02

David Crow

21-Jul-05 3:02

Something like:

LPBYTE lpBuffer2 = new BYTE[1000];
memcpy(lpBuffer2, lpBuffer, 2 * sizeof(BYTE));
delete [] lpBuffer2;

The other way is to not make it too big in the first place. Lastly, even if you ended up just using 2 of the 5000 bytes, that's not a big deal in the overall scheme of things.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: reduce size of array

John R. Shaw21-Jul-05 6:00

John R. Shaw

21-Jul-05 6:00

Strange.
Declare and array of 1000 bytes, then copy 2 bytes from the old array to the new array. D'Oh! | :doh:

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: reduce size of array

David Crow21-Jul-05 6:27

David Crow

21-Jul-05 6:27

John R. Shaw wrote:
Strange.

Indeed, but since the OP did not specify what size he wanted the array "shrunk" to, I just pulled a smaller number from the sky.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: reduce size of array

John R. Shaw21-Jul-05 6:45

John R. Shaw

21-Jul-05 6:45

:-DYeh; I thought about that after the fact.
Normaly I just substitute the numbers with something like new_array_size. Because it is closer to how we would actually write it.

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: reduce size of array

David Crow21-Jul-05 7:06

David Crow

21-Jul-05 7:06

John R. Shaw wrote:
Normaly I just substitute the numbers with something like new_array_size. Because it is closer to how we would actually write it.

Yes, I've done that too, only to be asked shortly afterwards, "What is this new_array_size thing and how do I use it?"

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: reduce size of array

Mepho21-Jul-05 19:51

Mepho

21-Jul-05 19:51

Ya first of all just like to thank everyone for helping out

cant use Cbytes for the application

and ya the buffer doesnt get filled by only 2... its filled by user specified items. So ill probably use the memcpy function that DavidCrow suggested, the buffer will be reduced by checking the amount the user filled.

Was hoping i didnt need to create another buffer array but seems like best solution is to cpy it so far.

Thanks,
Mepho

Timer

Halawlaws20-Jul-05 23:03

Halawlaws

20-Jul-05 23:03

When using a timer SetTimer(Bla,1000,0) the count start inside the timer or it waits until it get out of the ontimer function to start the time

/\|-||\/|/\|)

Re: Timer

toxcct21-Jul-05 0:20

toxcct

21-Jul-05 0:20

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_cwnd.3a3a.settimer.asp[^]

if this doesn't satisfy you, search the MSDN for SetTimer()[^]

TOXCCT >>> GEII power
[toxcct][VisualCalc]

mail attachment

_tasleem20-Jul-05 22:57

_tasleem

20-Jul-05 22:57

hi i want to know how to attach bmp file as attachment in email in vc. i m not using the MAPI and using the smtp server to send email.

ddd

Re: mail attachment

Alexander ^M.,21-Jul-05 1:25

Alexander ^M.,

21-Jul-05 1:25

Read the SMTP RFC!

Don't try it, just do it! Wink | ;-)

Re: mail attachment

David Crow21-Jul-05 3:08

David Crow

21-Jul-05 3:08

See these examples.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Passing Data Around Custom Draw Message Handler

yccheok20-Jul-05 22:55

yccheok

20-Jul-05 22:55

Hello all, I decide to have a list control, where it will print out the error message in red and the information message in green.

I try to take a look on http://www.codeproject.com/listctrl/lvcustomdraw.asp

The item is colered, based on their position. However, I need a way to store, to indicate whether this item represents error or information message.

Hence, I use the following approach:

In my method which inserting the control list item:

LVITEM lvi
lvi.lParam = ERROR_MESSAGE

In my custom draw method:

NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<nmlvcustomdraw*>( pNMHDR );
if ( (pLVCD->nmcd.lItemlParam) == ERROR_MESSAGE)

However, I always get something else in pLVCD->nmcd.lItemlParam

How I can pass the "error message" information to the custom draw message handler? Can anyone please advice on my implementation?

Thank you.

cheok

Re: Passing Data Around Custom Draw Message Handler

Blake Miller21-Jul-05 4:53

Blake Miller

21-Jul-05 4:53

When you added the items, did you remember to set LVIF_PARAM in the mask field?

LVITEM lvi

lvi.mask = LVIF_PARAM;
lvi.lParam = ERROR_MESSAGE;

If you don't do that, it will not store your lParam for you.

Compile program C++ by Visual C++.NET

SAKURAVN20-Jul-05 22:50

SAKURAVN

20-Jul-05 22:50

I write a class by C++, in this class use string. For exsample:

#include "string"
using namespace std;

int exsample{}
{
string strTest;
......
}

I compile by Visual C++.NET. I get a lot of errors:
(Compile by Visual C++ 6, no Errors)
Compiling...
wmutility.cpp
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(862) : error C2143: syntax error : missing ';' before '<'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(935) : see reference to class template instantiation 'std::istreambuf_iterator<_Elem,_Traits>' being compiled
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(862) : error C2238: unexpected token(s) preceding ';'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(863) : error C2143: syntax error : missing ';' before '<'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(863) : error C2238: unexpected token(s) preceding ';'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2143: syntax error : missing ')' before '*'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2143: syntax error : missing ';' before '*'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2864: '_Sb' : only const static integral data members can be initialized inside a class or struct
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2501: 'std::istreambuf_iterator<_Elem,_Traits>::_Sb' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2143: syntax error : missing ';' before 'throw'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(866) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(871) : error C2143: syntax error : missing ')' before '&'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(871) : error C2143: syntax error : missing ';' before '&'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(871) : error C2059: syntax error : ')'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(871) : error C2143: syntax error : missing ';' before 'throw'

Please help me this problemp.
Thank you very much!

CListCtrl

ditty grail20-Jul-05 22:49

ditty grail

20-Jul-05 22:49

how to enable CListctrl which is disabled at design time...

ditty grail

Re: CListCtrl

Jetli Jerry20-Jul-05 23:37

Jetli Jerry

20-Jul-05 23:37

m_listControlVariable.EnableWindow(TRUE);

Jetli
Constant Thing In World Is Change.

Need Help to Resolve the Problem in Hit test

SivaramanDhamodharan20-Jul-05 22:14

SivaramanDhamodharan

20-Jul-05 22:14

Hi,

The situation:
* Using a Window with the Scroll bar capabilities.
* The mapping mode is MM_HIMETRIC.
* Just drawn a Circle in the View using OnDraw()
* Handled MouseLeft button click to perform the hit test.

I know that:
* Mouse Co-ordinates are device co-ordinate system (in pixel)
* The circle drawn is in the Logical Co ordinate

My Doubt:
The following code does't work WTF | :WTF:

. Why?

What is wrong with me. I have tested it after converting the point into Logical point.

Code:

void CEX04CView::OnLButtonDown(UINT nFlags, CPoint point) <br />
{<br />
// TODO: Add your message handler code here and/or call default<br />
CClientDC dc(this);<br />
	OnPrepareDC(&dc);<br />
	CRect rectDevice = m_rectEllipse;<br />
	dc.DPtoLP(& point);<br />
	if (rectDevice.PtInRect(point)) <br />
{<br />
		if (m_nColor == GRAY_BRUSH)<br />
			m_nColor = WHITE_BRUSH;<br />
		else<br />
			m_nColor = GRAY_BRUSH;<br />
		InvalidateRect(rectDevice);<br />
	}<br />
CScrollView::OnLButtonDown(nFlags, point);<br />
}

Thanks in advance for the Valuable help! Rose | [Rose]

Re: Need Help to Resolve the Problem in Hit test

Jose Lamas Rios21-Jul-05 3:12

Jose Lamas Rios

21-Jul-05 3:12

SivaramanDhamodharan wrote:
The following code does't work

"Doesn't work" is a little vague. What or where is failing exactly?

SivaramanDhamodharan wrote:
CRect rectDevice = m_rectEllipse;

Despite its name, rectDevice is in logical coordinates, right? Since you are converting the point to logical coordinates too, the test in rectDevice.PtInRect(point) should work as expected.

However, when calling InvalidateRect, you should pass a rect in device coordinates, so I'd try doing dc.LPtoDP(rectDevice) before the call to InvalidateRect.

On another point, you are calling CScrollView::OnLButtonDown with the modified value of point... It probably doesn't matter (I don't think the default implementation actually uses this value), but I'd fix that too.

--
jlr
http://jlamas.blogspot.com/[^]

Re: Need Help to Resolve the Problem in Hit test

John R. Shaw21-Jul-05 6:32

John R. Shaw

21-Jul-05 6:32

Do not convert the point coordinates to logical coordinates.

1) If the rectDevice is in device coordinates, then no conversion is needed.

2) If the rectDevice is in logical coordinates then convert it to device coordinates instead.

InvalidateRect() does not take a rectangle in logical coordinates and niether does CScrollView::OnLButtonDown(nFlags, point).

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: Need Help to Resolve the Problem in Hit test

SivaramanDhamodharan21-Jul-05 20:57

SivaramanDhamodharan

21-Jul-05 20:57

Hi John,

Thanks it works.
"If the rectDevice is in logical coordinates then convert it to device coordinates instead." - This helped me with the Quote "InvalidateRect() does not take a rectangle in logical coordinates"

Thanks a Lot.

The Working Code is :

CClientDC dc(this);<br />
 OnPrepareDC(&dc);<br />
 CRect rectDevice = m_rectEllipse;<br />
 dc.LPtoDP(rectDevice);<br />
 if (rectDevice.PtInRect(point)) <br />
 {<br />
     if (m_nColor == GRAY_BRUSH) <br />
     {<br />
         m_nColor = WHITE_BRUSH;<br />
     }<br />
     else <br />
     {<br />
         m_nColor = GRAY_BRUSH;<br />
     }<br />
     InvalidateRect(rectDevice);<br />
 }

trouble in inserting data to tree control

firebolt7720-Jul-05 21:47

firebolt77

20-Jul-05 21:47

Hi..I want to insert a item to an existing tree and I want to make the item become the child of one of the tree members
for example:
before:
root
..|_parent1
..|_parent2
..|_parent3

after:
root
..|_parent1
..|_parent2
......|_(I want to insert my new item in here)
..|_parent3

but I didn't know how to do it. Plz help me because I'm a newbie in MFC programming
thx.

Re: trouble in inserting data to tree control

Marc Soleda20-Jul-05 22:29

Marc Soleda

20-Jul-05 22:29

m_treeCtrl.InsertItem. From MSDN:

HTREEITEM InsertItem( LPTVINSERTSTRUCT lpInsertStruct );

HTREEITEM InsertItem(UINT nMask, LPCTSTR lpszItem, int nImage, int nSelectedImage, UINT nState, UINT nStateMask, LPARAM lParam, HTREEITEM hParent, HTREEITEM hInsertAfter );

Download this project[^], you'll find it usefull.

Marc Soleda.

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Re: trouble in inserting data to tree control

David Crow21-Jul-05 3:07

David Crow

21-Jul-05 3:07

Call CTreeCtrl::GetItem() on the "parent2" item. Then call CTreeCtrl::InsertItem() to insert the new "child" item below that.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

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