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Hello. Can anybody tell me how-to add a icon to control listbox in MFC?
Thanks,
Caleb
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Use a CComboBoxEx instead, which has built-in support for images.
--Mike--
http://home.inreach.com/mdunn/
A recent survey reports that 1/4 of all internet users in England surf for porn.
The other 3/4 just didn't want to admit it.
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You have two options:
1) use owner-draw. In this scenario you're responsible for drawing listbox items; you can draw text, icons, whatever you want
2) switch to CListCtrl. This control can display item images.
Tomasz Sowinski -- http://www.shooltz.com
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Hi,
I have a class used to create a member varible within another class.
The problem is I can't pass values to the constructor as parameters, from the header file.
How do you normally deal with this scenario?
Cheers
Richard
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I think this is what you mean
Class A is a member variable of class B, and requires an int. I cannot do this inside my constructor:
{
m_A(12);
}
What I *can* do is this
B::B(char * pChar) : m_A(12)
By putting a colon and then listing the variable that needs values in it's constructor, the problem is solved.
Christian
Secrets of a happy marriage #27:
Never go to bed if you are mad at each other. It's more fun to stay up and fight.
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Hi,
I would like to create a bitmap, eventually to be saved onto disk. This is going to be a composite of two other bitmaps, placed side by side.
Can some one point me in the right direction of suitable functions and any issues involved.
Cheers
Richard
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Saving to disk requires GDI+ or an external library. Other than that, it's just a case of creating a bitmap big enough and drawing the two other bitmaps onto it.
Oh, and you'll have trouble if you use DDB's ( i.e. CBitmap ) and the two images are different bit depths to each other or the target image. I suggest if you don't use GDI+ you use a DIBSection wrapper, like the one found here on CP.
Christian
Secrets of a happy marriage #27:
Never go to bed if you are mad at each other. It's more fun to stay up and fight.
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I've had a problem with Visual C 6 for a while now where the debugger freezes after a certain point in the program.
For example. I set a break point somewhere in the program - say a method thats called when the use clicks on a button - when I click on the button the program freezes, and so does VisualC. I've tried leaving it like this overnight (maybe it was just being slow...) and it made no difference.
However it sometimes, albeit rarely, works.
I've tried re-installing service pack 6 and the same happens. I've tried reinstalling VisualC and the same happens, I've even tried reinstalling Windows (going from 98 to 2000) and the same happens.
Oh, it doesn't seem to happen with all projects. It seems to only happen with largish projects. With my current project, and with the VisualStudioDemo project (part of the BCGControlBar library), but not with a simple dialog demo.
Any ideas on how to solve this?
Thanks
Duncan Strand
www.zebs.org.uk
(Win2000 sp2, VC6 sp5)
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I'd like to do something if a view in my MDI app loses focus to another view, but not if it loses focus to a dialog or message box. OnKillFocus gives me a pointer to the new CWnd, so is there a safe way to check if that is a CView?
thanks,
Jake
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I think you may use pWnd->IsKindOf(RUNTIME_CLASS(CView)) - look in MSDN for that function (from CObject).
Paolo
------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)
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You can try this:
CWnd* m_wnd; (pointer you get from OnKillFocus)
if (m_wnd->IsKindOf(RUNTIME_CLASS(CView)))
// Its a CView
else
// Its not a CView
Bret Faller
Odyssey Computing, Inc.
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I have an OnKillFocus handler on an edit control. If the user
presses the window close ("x") button while the focus is on the
control, I would like to handle the WM_CLOSE message, however the
KillFocus message is being generated first.
How can I either determine in the OnKillFocus handler that the
user pressed the "x" button, or alternately, what message can
I handle that would occur before the KillFocus.
As a last resort, is there any way to disable the "x" button?
Thanks,
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How can I tell which if any ports are open. I can attempt to open and close them, but that doesn't tell me if its already opened, that only tells me whether or not I can open it now (which may mean the port just does not exist)..
Thanks,
John
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yust trace netstat -a 
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I have an app A, which uses CreateProcess to spawn another app B. It works fine.
I took the code from A and moved it to another app C. I thought app C would now launch app B. It does but as soon as B becomes alive it(B) causes an 'illegal instruction' and exits.
How can it be it works with app A and not C? Could you help me find possible reasons for this behaviour.
Thank You
LP
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Hi,
in a simple application using Document/View Architecture:
In My view I have a CWnd Item, I use it to create a very special control, it work very well.
so you can see theses lines in my view definition (.h)
class CBoopView : public CView
{
[.....] //some stuff
public:
CMYSpecialControl MyControl;
[.....] //other stuff
};
//then in the cpp file i create the control itself that way
int CBoopView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
CRect MyRect(10,10,200,30);
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
//for sure MyControl.Create is an override to simplify his creation
MyControl.Create(MyRect,this,1);
MyControl.ShowWindow(SW_SHOWNORMAL);
return 0;
}
in the CMYSpecialControl, derived from CWnd you can find this override on
the create function
BOOL CGraphScroll::Create(const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)
{
return CWnd::Create(NULL,
_T(""),
WS_CHILD,
rect,
pParentWnd,
nID,
pContext);
}
Now the problem is:
MoveWindow(...) and SetWindowPos(...) did'nt work!! My special control is a CWnd so i'm supposed to be able to replace it anywhere in the parent frame(my view) but it didn't work.
I've try a lot of thing.
who control the client area of my control? his parent(My View)? himself?
It's hard to find the exact way you must create a child window in a view and how deal whit it....
thanks for help or anything who can help me to find the solution
Remi Morin
Remi.Morin@Lyrtech.com
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Well, a view is just like any other window, nothing special from the system's point of view.
Which exactly is the problem? Can you see the child window?
Maybe you need to add the style WS_CLIPCHILDREN to the view, in PreCreateWindow(). You should be able to move/resize the child window at any time (if it's been created of course).
Paolo
------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)
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I can see the control at it's original position, but if I move it, it is not display anymore. In fact my special control is only able to draw himself in the first rectangle he received in the create function.
example:
MySpecialControl.Create(CRect(10,10,100,50),this,1);
this will work very well
I can see my control but when i try to move it that way:
MySpecialControl.OnNewSize(this,CRect(10,35,100,50));
OnNewSize is a member function that i have create
void CMySpecialControl::OnNewSize(CWnd *pParent,CRect MyRect)
{
//that way
MoveWindow(MyRect,TRUE);
//or that way (i have also try the two...)
SetWindowPos(pParent,
MyRect.top,
MyRect.bottom,
MyRect.Width(),
MyRect.Height(),
SWP_SHOWWINDOW)
}
Maybe there something I don't understand whit windows...
By the way I've try this
PreCreateWindow(CREATESTRUCT& cs)
{
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
cs.style |=WS_CLIPCHILDREN ;
return CView::PreCreateWindow(cs);
}
nothing...
do I have to call the OnSize(UINT nType, int cx, int cy) or something like that?
thank you
Remi Morin
Remi.Morin@Lyrtech.com
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...now it work...
i don't know why...
and I don't know why it was'nt working...
Remi Morin
Remi.Morin@Lyrtech.com
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I am using CInternetSession, CHttpConnection, and CHttpFile to get a file
from an HTTP server.
I am having a problem though determining if the initial connection succeeded
or not. If the server is 'off' then the code seems to execute despite my
'ifs' and produces an exception. If I put the statement throwing the
exception into a try-catch, it isn't caught, and crashes the program anyway.
CInternetSession net;
CHttpConnection* http = NULL;
CHttpFile* file = NULL;
http = net.GetHttpConnection("cabadam.homeip.net");
if (http == NULL)
{
status += "Failed to connect to server!\r\n";
dlg->edit_status.SetWindowText(status);
dlg->GetDlgItem(IDC_BUTTON_CONTINUE)->EnableWindow(1);
return 1;
}
file = http->OpenRequest(CHttpConnection::HTTP_VERB_GET,"version.txt");
try
{
file->SendRequest(); //THIS STATEMENT crashes the program even though it
is inside a try catch
}
catch (CInternetException pEx)
{
status += "Failed to connect to server!\r\n";
dlg->edit_status.SetWindowText(status);
dlg->GetDlgItem(IDC_BUTTON_CONTINUE)->EnableWindow(1);
return 1;
}
I have tried several different things, but I haven't been able to figure out
how to determine if it was unable to connect with the server.
Am I doing something wrong? Or is there an easier way to do this?
Thanks!
Adam
cabadam@houston.rr.com
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try this:
try
{
http = net.GetHttpConnection("cabadam.homeip.net");
}
catch(CInternetException *ex)
{
...failed...
ex->Delete();
}
hope this helps
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Oh duh!!
On the catch, I had the pEx as CInternetException, not CInternetException*
That did it...
thx
Adam
cabadam@houston.rr.com
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When I fail to define a New Class correctly, how do I remove the New Clas from the project, si I can redifine it?
Richard
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delete the files from the file view (highlight, press delete)
delete the actual files (from Explorer)
delete your .CLW file (from Explorer). this will be regenerated the next time you launch classwiz
-c
------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com
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