C / C++ / MFC Discussion Boards

AVL Tree insertion algorithm

Sarath C1-Feb-05 3:27

Sarath C

1-Feb-05 3:27

any body can explain the AVL Tree insertion algorithm. or pls give some useful links for the same

Thanks,
Sarath

Hooked MDIChild window ---> problem

Ro_land1-Feb-05 3:15

Ro_land

1-Feb-05 3:15

Hi !

I managed to hook a MDIChild window to a class of mine, which is derived from the class CHookWnd , supplied by J.P.Naughter (see article http://www.naughter.com/hookwnd.html)

I additionally do attach a Toolbar programmatically to the hooked MDIChild window, all works fine, meaning that 1)the toolbar is created and attached, 2) the messages are rerouted to my WindowProc.

There is one problem , though:
I am not able to intercept the WM_COMMAND message sent, whenever I click on one of the toolbar buttons, this message is sent directly to the child and not rerouted. I also DO NOT want to induce a redirection of the message from within the MDI child window, that would be pointless in my case.

QUESTION : How can I intercept the WM_COMMAND messages issued upon clicking the toolbar buttons such, that they will be redirected automatically to my WindowProc procedure.

The whole project is available upon request,

thanks to anyone trying to help,

Rubi

Re: Hooked MDIChild window ---> problem

Roger Allen1-Feb-05 6:10

Roger Allen

1-Feb-05 6:10

The problem is due to the way MFC routes the messages in the OnCmdMsg() function.

BOOL CFrameWnd::OnCmdMsg(UINT nID, int nCode, void* pExtra,
	AFX_CMDHANDLERINFO* pHandlerInfo)
{
	CPushRoutingFrame push(this);

	// pump through current view FIRST
	CView* pView = GetActiveView();
	if (pView != NULL && pView->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	// then pump through frame
	if (CWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	// last but not least, pump through app
	CWinApp* pApp = AfxGetApp();
	if (pApp != NULL && pApp->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	return FALSE;
}

If you override this function in your mainframe you can add an extra stage to query the CMdiChild window.

e.g.

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra,
	AFX_CMDHANDLERINFO* pHandlerInfo)
{
	CPushRoutingFrame push(this);

	// pump through current view FIRST
	CView* pView = GetActiveView();
	if (pView != NULL)
	{
		CWnd *pParent = pView->GetParent();
		if (pParent != NULL && pParent->OnCmdMdg(nID, nCode, pExtra, pHandlerInfo))
			return TRUE;
	}
	if (pView != NULL && pView->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	// then pump through frame
	if (CWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	// last but not least, pump through app
	CWinApp* pApp = AfxGetApp();
	if (pApp != NULL && pApp->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	return FALSE;
}

If you vote me down, my score will only get lower

Re: Hooked MDIChild window ---> problem

Ro_land2-Feb-05 19:19

Ro_land

2-Feb-05 19:19

Thanks , but I should have explained better. What I needed to achieve was a way to cause my DLL to plug into an existing application by some other programmer, without having to involve the the other programmer .This way , he wouldn't have to change a bit. There would be only his application with a few MDI child windows created by him, while I hook up to those MDI child windows, I induce the creation of different toolbars for the respective MDI child and intercept all the messages to those windows, thus taking over the MDI children. I achieved it, everything works fine now. As I explained in the former posting, I do receive the rerouted messages. The WM_COMMAND message cannot be intercepted by me, it is intercepted in the MDI child, but I found a way around it. Whenever I create the toolbar, I keep record of the amount of buttons and record the rectangles within the toolbar, where they are located. Now, I need just to catch the WM_LBUTTONDOWN and ..BUTTONUP messages, thus enabling me to detect which button was pressed and take action... Works great !

Thank you for your interest !
Rubi

AVL Tree

Sarath C1-Feb-05 3:05

Sarath C

1-Feb-05 3:05

Any useful links to understand AVL Tree insertion Algorithm?

Sarath

extracting part of a string

si_691-Feb-05 2:52

si_69

1-Feb-05 2:52

hi all

does ne1 know the best way of extracting a sting

what i need to do i extract str1 out of str2

CString str1 = "7"
CSting str2 = "07HGN"

so the result for str2 would be "0HGN"

any ideas

thanks

si

Re: extracting part of a string

V.1-Feb-05 3:03

1-Feb-05 3:03

Check out : CString members[^]

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: extracting part of a string

Sarath C1-Feb-05 3:26

Sarath C

1-Feb-05 3:26

The common logic is:

int nPos = str2.Find(str1);
int nDelLen = str1.GetLength();
if(nPos != -1)
str2.Delete(nPos,nDelLen);

This is a simple method. u can also use extraction method using Left, Right, Mid functions and concatenate the extract the string.

Sarath

Re: extracting part of a string

bolivar1231-Feb-05 5:32

bolivar123

1-Feb-05 5:32

Or how about:

str2.Replace(str1,"");

....

Re: extracting part of a string

toxcct1-Feb-05 5:52

toxcct

1-Feb-05 5:52

CString str1 = "7";
CString str2 = "07HGN";
CString strResult = str2.Mid(0, str2.Find(str1)) + str2.Find(str.Find(str1)+1, -1);

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

Caveats when using SetParent ?

Maximilien1-Feb-05 1:27

Maximilien

1-Feb-05 1:27

I have a CDialog (as child of something else) that I need to reparent to another window ( a CWnd child of a floating/non-floating evil dialogbar ).

Are there any caveats when reparenting CWnd in general ?

( I know it's very vague, but I'm looking for generics before going deeper into the problem )

Thanks.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Any example Advise Sink in C++ ?

im4help1-Feb-05 1:13

im4help

1-Feb-05 1:13

Hi I want to develop one small Win32 Console Application which monitors the Microsoft Exchange Outlook and if there is any new mail in user mail box it will tell that there is new message.

For this I want to use Advise Sink and and using MAPI I want to develop small application. Any material or any example that can help me.

Though I have foun many applications but all are in COM or DCOM so I don't know how to write Interface in simple C++ ?

Please if any one can help me it will be gr8

Thankx in advance...

Yours

Mike

vc++

nowshadmc1-Feb-05 1:01

nowshadmc

1-Feb-05 1:01

kindly give me the information about how to link between the projects created in workspace using win32 console application

Nowshad.M.C
nowshadmc@rediffmail.com

Intelligent Agent

SummersZone1-Feb-05 0:49

SummersZone

1-Feb-05 0:49

Hi I am starting a new project to program an AI Agent. Before I started I wanted to look for source code for similar projects. Can anyone give me links or anything? just to have an idea

Thanks

Re: Intelligent Agent

Selvam R1-Feb-05 1:51

Selvam R

1-Feb-05 1:51

Hi,

Do you mean Microsoft Agent Programming???

http://www.microsoft.com/msagent/dev/code/default.asp[^]

Regards,
Selvam

GET ICON

kedar.dave1-Feb-05 0:33

kedar.dave

1-Feb-05 0:33

hiii...

how can i get an ICON from a window and pass it to the
CreateWindowEx function?

regards,

kedar.

Re: GET ICON

ThatsAlok1-Feb-05 2:53

ThatsAlok

1-Feb-05 2:53

kedar.dave wrote:
how can i get an ICON from a window and pass it to the
CreateWindowEx function?

if you want to get the Icon from some other window and use that in your window program you can use ExtractIcon api

here is small code listing for that

HICON m_hRemoteIcon;
CString m_strFileName;
<font color=#008000>//Assume m_strFileName point to valid Program file//Now use the Extract Icon api to Extract the Icon
//First Parameter =NULL( indicateuse the curent instance)
//Second Parameter = Name of file from which you want to extract icon
//Third Parameter : Index of icon ,here i am extracting the
// first icon from the exefile
</font>

m_hRemoteIcon=ExtractIcon(NULL,m_strFileName,0);
<font color=#008000>//here  m_statIcon is static ctrl of type ICON </font>
m_statIcon.SetIcon(m_hRemoteIcon);

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

Re: GET ICON

kedar.dave2-Feb-05 19:06

kedar.dave

2-Feb-05 19:06

thanks a lot Alok...

i also have another Query...

how can i get a bitmap and an image n use it ?

if possible...can u attach a piece of code..

regards,

kedar.

resize PropertySheet

includeh101-Feb-05 0:32

includeh10

1-Feb-05 0:32

(MFC questions)
how to use mouse to resize property sheet

thx

includeh10

Re: resize PropertySheet

PJ Arends1-Feb-05 10:25

PJ Arends

1-Feb-05 10:25

http://www.codeproject.com/property/resizableproperties.asp[^]

Basicly in your propertysheet's OnSize handler you have to resize the tab control to match the sheet and then resize the active page to match the tab control. Then use your propertypage's OnSize handler to resize the controls on the page.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

How to get image dimensions?

Monisankar1-Feb-05 0:08

Monisankar

1-Feb-05 0:08

Is there any API to get dimensions(height and width)of an image(jpg or gif)?
Please help..

Re: How to get image dimensions?

Selvam R1-Feb-05 1:48

Selvam R

1-Feb-05 1:48

Hi,

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_0rho.asp[^]

Regards,
Selvam

Re: How to get image dimensions?

viliam1-Feb-05 3:08

viliam

1-Feb-05 3:08

With GDI+ it could be like this:

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;

INT main()
{
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

Image* image = new Image(L"Crayons.jpg");
UINT imageHeight = image->GetHeight();
printf("The height of the image is %u.\n", imageHeight);

delete image;
GdiplusShutdown(gdiplusToken);
return 0;
}

viliam

Overriding mouse events in Win32 Console application

mahade131-Jan-05 23:49

mahade1

31-Jan-05 23:49

Hi,

Well, I have a console based application which keeps printing to the console for every second or so. The problem that I am facing is when some user clicks on the console, the application is just hanging because of the "printf()" function. The thread resumes operation only after the user presses the right click button.

Any clues as to how I can over ride the mouse events in a console application? (this seems to be the only solution to me, any other solutions are more than welcome).

I have heard something about "GetConsoleWindow()" etc. which provides an alternative to printf()...any1 can please update me on this??

Thanks a lot folks.

Regards,
Mahadevan.

Page Flip Effect

Muneeb R. Baig31-Jan-05 23:43

Muneeb R. Baig

31-Jan-05 23:43

Hi!
I am writing an application kinda photo album in which i want to provide the page flip effect. i don't know what

should i select from the following:
DirectX
GDI
OpenGL
or something else.

currently i worked with my graphics+web designer and developed the application using Flash; but you might know that

flash is not reliable and doesn't provide better integration with VC.

I can code in VC, C# and VB/VB.NET. so i would appreciate your effort if you suggest me in this regard.

Thanks.

Muneeb-ur-Rehman Baig.
A thing of beauty is the joy forever.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.