Solution found... - C / C++ / MFC Discussion Boards

Re: Confused about FindResource

albean4-May-02 9:12

albean

4-May-02 9:12

No, I am not using #define _UNICODE. Should I be?

Re: Confused about FindResource

Michael Dunn4-May-02 9:25

Michael Dunn

4-May-02 9:25

The error message says the compiler is expecting a unsigned short*, which indicates a Unicode string. If you don't know what Unicode is, you shouldn't be using it. Wink | ;)

Now, the APIs that accept strings can be built for either ANSI or Unicode strings. To use the ANSI APIs, #define _MBCS either in your main header file before all #include statements, or (better) in your compiler options.

--Mike--
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Set Combo Box values??

Aoife4-May-02 3:07

Aoife

4-May-02 3:07

Hello,

I'm using MFC dialog based app. In it I have two dialog boxes Dialog1 and Dialog2. There is a Combo Box in Dialog2 that I want to populate with integer values obtained from Dialog1. The following explains what I want to do.

Dialog1.cpp

#include "Dialog2.h"

clear all contents from the Combo Box in Dialog2

while (number < 10)
{
...
if(some condition)
{
write whatever the 'number' value is to the
combo box in Dialog2
}
...

number++;
}

Does anyone know how I can do this or know of any document explaining this.

Thanks in advance,

Aoife

Re: Set Combo Box values??

Ravi Bhavnani4-May-02 3:49

Ravi Bhavnani

4-May-02 3:49

Use ResetContent() to clear the contents of a combobox. To add elements, use AddString() or InsertString().

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Just about had enough, stupid debug error

Alexander Wiseman4-May-02 2:17

Alexander Wiseman

4-May-02 2:17

Hello!

I am working on a custom control derived from CWnd, which I was hoping to put on CodeProject until I tried the control with the Create function (two step creation) in debug mode and it errored out. I then tried the control in Release mode and everything worked fine. Here is what my create function looks like:

//Function: Create
//Job: creates the NavBarCtrl
BOOL CNavBarCtrl::Create(const RECT& rect, CWnd* parent, UINT nID, DWORD dwStyle /* = WS_CHILD | WS_BORDER | WS_TABSTOP | WS_VISIBLE*/)
{
//Make sure variables are valid:
ASSERT(parent && IsWindow(parent->GetSafeHwnd())); //parent must be a valid window
ASSERT(parent->GetDlgItem(nID) == NULL); //must be a unique dialog item

//Create the window:
if(!CWnd::Create(NAVBARCTRL_CLASSNAME, NULL, dwStyle, rect, parent, nID))
return false;

//Done:
return true;
}

The program crashes in debug mode sometime within the call to CWnd::Create. I have properly initialized the class name contained in NAVBARCTRL_CLASSNAME, since I used the same code Chris Maunder does in his grid control. Just a side note, I tried this code in debug mode first on a Windows XP machine, and was unable to get into the heart of the CWnd call to see what was wrong. Then I tried the code on a Windows 2000 machine and was able to debug enough to see that apparently the code was ASSERTing in the call to CWnd::Attach, on this line:
ASSERT(m_hWnd == NULL)

I examined the values for m_hWnd and found that, while it did not point to any place in memory (pointer had not been initialized), the value was not NULL. So I tried setting m_hWnd to NULL right before the call to CWnd::Create, but that didn't help. I am hoping someone can shed some light on this situation because it is really annoying to have to run all the programs that use this control in Release mode, and frankly, I hate miscellaneous errors. I would rather not send the code, but if it will help to solve this problem then I will do whatever.

Thanks in advance!
Eek! | :eek:

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

Re: Just about had enough, stupid debug error

Neville Franks4-May-02 11:11

Neville Franks

4-May-02 11:11

Alexander, how are you instantiating CNavBarCtrl? If m_hWnd is erroneous then it sounds like the instance of CNavBarCtrl might not be valid.

I don't understand why you couldn't step into the code CWnd::Create on XP.

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: Just about had enough, stupid debug error

Alexander Wiseman5-May-02 9:59

Alexander Wiseman

5-May-02 9:59

Hi Neville,

Thanks for your response. I am creating a pointer to a CNavBarCtrl and then using the 'new' operator to create a new object of the class. Then in the create call, the program crashes in debug mode (it runs fine in release mode). Here is the code I use to create it:

//somewhere in .h file of a view class:
CNavBarCtrl *m_nav;

//in .cpp file:
m_nav = new CNavBarCtrl();
if(!m_nav->Create( /* variables */ )) //crashes in debug mode

I couldn't step into the code of CWnd::Create on XP because every time I was in debug mode and reached that line and then pressed the button to step into the next function, the program crashes as soon as I did (in other words, it threw an exception as soon as I tried to step into the function).

If you could shed some light on this I would be very appreciative!
Thanks in advance!

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

Solution found...

Alexander Wiseman6-May-02 9:34

Alexander Wiseman

6-May-02 9:34

Hello!

Just in case anyone was wondering, I found the solution to the problem. Stepping through the code didn't work on my machine for some reason, but the actual problem was a line fo code in PreSubclassWindow. Just goes to show how you should really know your window creation process; I din't remember when it was called and so when I manually stepped through the code I found the error in that function.

Thanks for your time!

Sincerely,
Alexander Wiseman

Est melior esse quam videri
It is better to be than to seem

Fonts

Sonu Kapoor4-May-02 1:54

Sonu Kapoor

4-May-02 1:54

Hi Guys,

how to get the Current installed fonts ??? I am already usinf the EnumFontFamilies() Function, but i want to use an another function ! Maybe somebody knows one Smile | :)

)

Thanks for your help

Best Regards

Sonu

Re: Fonts

Tom Archer4-May-02 5:41

Tom Archer

4-May-02 5:41

In the MSDN article, "Enumerating the Installed Fonts", it states that to do what you want you need to utilize the EnumFonts and EnumFontFamilies functions. If you're looking for an alternative, you'll need to let us know what exactly you're looking to do that these functions don't.

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Re: Fonts

Sonu Kapoor4-May-02 6:42

Sonu Kapoor

4-May-02 6:42

As mentioned i already use the Enumfontfamilies. I dont know what i am doing wrong but the function is very slow in my app. Actually i want to draw all installed fonts in my app !! The EnumFontFamilies does this but its slow, maybe its a bug in my app but i cant find it. If you want i can send you my app to your email id. Just let me know.

Thanks for your Help

Best Regards

Sonu

Re: Fonts

Tom Archer4-May-02 6:53

Tom Archer

4-May-02 6:53

sonu wrote:
I dont know what i am doing wrong but the function is very slow in my app

This was the part you didn't mention, which was why nobody could help you - we didn't know what the problem was - just that you didn't want to use EnumFamilyFonts. Go ahead and send me the app and I'll take a look at it as time permits.

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Quickest way to get childern of CTreeCtr

generic_user_id4-May-02 0:12

generic_user_id

4-May-02 0:12

What is the best way to get the number of items from a 'branch' of a tree control, so I can put a number in brackets behind the name of the parent.

ROOT
- People (2)
* Paul
* John
- Kids (3)
* Jack
* Tom
* William

So in this case I want to know how many items have "people" as parent. (that's two)

GetCount() returns the total number of counts, so that's useless.

Also, how can I change the name of an already existing item in a treeview?

Who can help me out?

Cheers!

I got it working, nevermind.

generic_user_id4-May-02 0:59

generic_user_id

4-May-02 0:59

[nt]

Re: I got it working, nevermind.

Tom Archer4-May-02 5:23

Tom Archer

4-May-02 5:23

While many of us know the solution, it would be great if you could share your solution as well. That way, another person searching for this will find a complete solution. Besides, you might have come up with a unique way of completing the task that would teach us all.

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Sure, this is what worked for me.

generic_user_id6-May-02 6:20

generic_user_id

6-May-02 6:20

HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
	
CBitmap bitmap;
CBrush brush;

bitmap.LoadBitmap(IDB_BACKG);
	
int nCtrl = pWnd->GetDlgCtrlID();
pDC->SetBkColor(RGB_VALUE);

if ( NULL != brush.m_hObject )            
        ::DeleteObject(brush);        

brush.CreatePatternBrush(&bitmap);
hbr = brush;
return hbr;

This is not written by me though, I read something like this somewhere else.

Re: Sure, this is what worked for me.

Tom Archer6-May-02 14:17

Tom Archer

6-May-02 14:17

Um...what does this have to do with getting the children of a HTREEITEM Smile | :)

Cheers,
Tom Archer
Author - Inside C#, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Re: Sure, this is what worked for me.

generic_user_id6-May-02 23:24

generic_user_id

6-May-02 23:24

Oops, I answered the wrong question of myself here. Smile | :)

My solution to this one was pretty cheap, I just made a counter (structure with HTREEITEM and an INT) and every time an item was added to a part of a tree I updated the counter.

As the user could not add or delete things from the tree, this solution worked quite well.

I used GetItemtext(..), added "(%d)" to the string and set the new string with SetItem(..)

But I take it this was not the 'obvious' solution Smile | :)

Event handling for dynamically created controls

sanskypotov3-May-02 23:48

sanskypotov

3-May-02 23:48

Hi,
I am having the following scenario
a class CMy( and is not MFC class ),
and I create 3 objects a,b,c ( actually I need to create
any number of objects)

CMy a , b ,c

now CMy has an event WM_LBUTTONDOWN, WM_LBUTTONUP

I want only 1 function(event handler) OnMouseLButtonDown(),
so this is called whenever I press any one of the object
i.e a , b or c

I am trying to avoid Subclassing.

Can some tell me what should I do.
Thanks,
Sansky Big Grin | :-D

God is Good, all the Time.
All the Time, God is Good.

Re: Event handling for dynamically created controls

Maxwell Chen4-May-02 0:13

Maxwell Chen

4-May-02 0:13

Maybe you may try to modify my code below into what you want to...

#include <iostreamᡊe9ac73-238b-46be-991d-0f050c37248dusing namespace std;

class CCore
{
public:
	void Job(int iId) {
		// Do the job
		cout << "Hey this is button " << iId << " clicked.\n";
		// Passing info from that ID to WM_LBUTTONDOWN....
	}
};

class CMy
{
	int _iId;
	static CCore _EventMachine;

public:
	CMy(int iId) { _iId = iId; }
	void ButtonLClicked() {
		_EventMachine.Job(_iId);
	}
};

CCore CMy::_EventMachine;


void main()
{
	CMy	btn[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

	btn[2].ButtonLClicked();
	btn[6].ButtonLClicked();
}

Maxwell Chen
People say "No news is good news". Then, no code is good code!?

Re: Event handling for dynamically created controls

Tom Archer4-May-02 5:44

Tom Archer

4-May-02 5:44

Subclassing is precisely what you need. In fact, it's what the MFC control classes do for you internally. Therefore, you don't want to use MFC, you'll need to either manually do the subclassing yourself or use another library that does it (such as MFC).

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Re: Event handling for dynamically created controls

Maxwell Chen4-May-02 7:40

Maxwell Chen

4-May-02 7:40

Tom Archer wrote:
Subclassing is precisely what you need.

Hi Tom, was my way wrong ?
Confused | :confused:

Maxwell Chen
People say "No news is good news". Then, no code is good code!?

Re: Event handling for dynamically created controls

Neville Franks4-May-02 11:17

Neville Franks

4-May-02 11:17

Hi Maxwell, I would have thought you would have a base class as you've done and then have virtual OnxxxButton() function in the base class to handle the event. This could then be overriden in the derived classes as required.

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: Event handling for dynamically created controls

Tom Archer4-May-02 11:21

Tom Archer

4-May-02 11:21

Hi Maxwell,

I guess I'm just not understanding how your code is going to attach handlers to control windows messages without hooking the control's wndproc. Can you explain that a bit more? Maybe I'm just missing something obvious here.

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

Re: Event handling for dynamically created controls

Tom Archer4-May-02 12:52

Tom Archer

4-May-02 12:52

Ok. I finally took more than a second to look at your code Smile | :)

The issue is that I'm looking at it from a different level than you. You're assuming you already have the routed messages (via subclassing the control) and are providing an event machine to better handle the messaging of an array of controls. I, on the other hand, was thinking that the poster wasn't even at the point of getting the messages for the controls yet. He hasn't responded to any of the posts yet so it'll be interesting to see what he really is trying to get.

By the way, with regards to your "event engine", is this something you threw together for this question or is it something more fleshed out that you could share with us (maybe in an article with examples of its use)?

Cheers,
Tom Archer
Author, Inside C#
Author, Visual C++.NET Bible

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af

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