C / C++ / MFC Discussion Boards

balgovindpandey13-Jul-01 8:17

13-Jul-01 8:17

I have a UserDefined Class named CMyProj and A dialog box class,CMyDlg.
The dialog box has a ListBox control placed in it.
with m_Listbox as member variable of type CListCtrl.
I want to acess the following function of
list box from my class (ie)CMyProj
m_ListBox.AddString()
For This I have created an Object of class CMyDlg
some thing like this
CMyDlg *pDlg
pDlg->m_ListBox.AddStriing("Some String");
On Compiling this application Iam getting Asset Voilation exception

Can Any one help me to solve my problem

bgpandey,

Re: Problem with List Box Addstring Method

Frank Deo13-Jul-01 11:14

Frank Deo

13-Jul-01 11:14

Where does the Assert occur? If it is in IsWindow(m_hWnd) more than likely, the framework can't find the listbox to addd the string.

You'll have to get a valid pointer to the listctrl after its created. Also, make sure that the member variable defined in your Dlg class is defined public. Other than that...sorry i cant be more help.

I fight with this every time I use a ctrl class. Unfortunately, I don't have a solution. A few days ago I posted a similar question.

Good luck (to both of us). Big Grin | :-D

Frank

Re: Problem with List Box Addstring Method

Steve T13-Jul-01 18:06

Steve T

13-Jul-01 18:06

There's got to be more to your code than you're telling!

>> CMyDlg *pDlg
>> pDlg->m_ListBox.AddStriing("Some String");

There must be something more between these two lines
You can't just start using an uninitialized pointer
lime that!

It would help if you could copy all the relevant
code segments instead of just jotting down ( complete
with typos ("AddStriing" with two i's) a few lines
that you think may be relevant.

Do you ever create an instance of CMyDlg?
If so what do you do with m_ListBox in the
constructor of CMyDlg?
Do you invoke the Dialog? ( DoModal() )

Also "AddString()" is not a member function of
CListCtrl - it's a member of CListBox. Is m_ListBox
really of type CListCtrl? or is it actual of type
CListBox?

Give a bit more info and I'll try to help a bit
more.

Steve T.

Re: Problem with List Box Addstring Method

Bret Faller18-Jul-01 12:54

Bret Faller

18-Jul-01 12:54

Well, first it should be CMyDlg dlg; dlg.m_ListBox.AddString("..."), but like a previous reply stated, if it fails on the m_hWnd its because the ListBox hasn't been created yet and then you should think about maybe passing it as a parameter to the constructor of the dialog.

Bret Faller
Odyssey Computing, Inc.

Dialog Bars.

John Uhlenbrock13-Jul-01 7:38

John Uhlenbrock

13-Jul-01 7:38

MSDN states:

"While it is normal to derive your own dialog classes from CDialog, you do not typically derive your own class for a dialog bar. Dialog bars are extensions to a main window and any dialog-bar control-notification messages, such as BN_CLICKED or EN_CHANGE, will be sent to the parent of the dialog bar — the main window."

I am able to create the control-notification messages handlers, however that is all. I cannot get the buttons activated, I cannot set checkboxes, I cannot set the text in a text box....etc. How is this supposed to be done without a derived class?

Thanks, John
johnu@micromotion.com

ps - If anyone has a simple app that uses a dialog bar with a few controls, like buttons, text boxes, etc, and they are willing to share, it would be greatly appreciated.

big endian to little endian

13-Jul-01 7:18

could somebody help me get some piece of "C" code which would convert from Big Endian to Little Endian byte orders ?
The situation is that I am reading a Solaris binary file which has Big Endian format. When I fread() it in a NT machine,I need to convert it to Little Endian for it make sense.

PS :
1. We could always use the winsock functions like htons or htonl but I do not want to link the entire wsock32 dll to my dll
just for these functions.

2. No .Net APIs please ! pure "C" - preferably platform independent

Thanks !
Retish

Re: big endian to little endian

C^hris L^osinger13-Jul-01 8:07

C^hris L^osinger

13-Jul-01 8:07

long t = 55;
SwabLong(&t);

void SwabLong(void* lp)
{
	BYTE* cp = (BYTE*) lp;
	int t;
	
	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
}

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: big endian to little endian

Michael Dunn13-Jul-01 8:10

Michael Dunn

13-Jul-01 8:10

Just use the bitwise and shift operators:

unsigned short s1, s2 = 0x1234;
s1 = (s2 & 0xFF) << 8 | (s2 & 0xFF00) >> 8;

I'm not sure of the operator precedence there (since I rarely write expressions like that, I don't know the precedence off the top of my head), but that should be enough to get you started.

--Mike--
http://home.inreach.com/mdunn/
Sometimes, arming yourself with a big pointy stake just won't do you any good.

Re: big endian to little endian

13-Jul-01 8:32

chris and michael,

thanks a ton to both of you ! ur code is wonderful ! it works GREAT !!

thanks
Retish

Tab Control

RobJones13-Jul-01 6:01

RobJones

13-Jul-01 6:01

Are there any good articles (with examples) on how to use the tab control? I have seen the few articles posted under tab controls here but they look like customized tab controls and I don't even know how to use the basic MFC tab control. Any suggestions?

Thanks,

Rob Jones

CString from basic_string

13-Jul-01 5:06

How do i turn a basic_string into a CString, or get the contents from one to the other??

Thanks,

Re: CString from basic_string

Michael Dunn13-Jul-01 5:34

Michael Dunn

13-Jul-01 5:34

basic_string<TCHAR> bs;
CString cs;

cs = bs.c_str();
bs = (LPCTSTR) cs;

--Mike--
http://home.inreach.com/mdunn/
Sometimes, arming yourself with a big pointy stake just won't do you any good.

Re: CString from basic_string

Kevnar14-Jul-01 11:07

Kevnar

14-Jul-01 11:07

I'm not sure about basic_string but for string I usually use

CString cstrText = strText.c_str();

the c_str() function does the trick...

Get DB Settings via ODBC

Derek Price13-Jul-01 4:48

Derek Price

13-Jul-01 4:48

Hello!

I am interested in getting SQLAnywhere 5.5 database switches (EngineName, Start, etc.) via ODBC using VC++. I can create these using SQLConfigDataSource(), but can't figure out how to retrieve them.

Any ideas?

Thanks,
Derek

Re: Get DB Settings via ODBC

Bret Faller18-Jul-01 12:55

Bret Faller

18-Jul-01 12:55

Try SQLGetConfigMode(...) or SQLGetInfo(...)

Bret Faller
Odyssey Computing, Inc.

EDIT BOX

13-Jul-01 4:43

I have created a dlgbox where i put edit box and button. In one of the edit box, i have attached a COleDateTime variable to it. So, the variable is initialized with GetCurrentlyDate, and keep this value all the time whatever i do to change it, it recognizes only the today date and just this date. It's problem for me because i want to be able to change the date and to use this new date for others parts of my application. How could i do that?

thanks in advance

gerald

Re: EDIT BOX

Daniel Ferguson13-Jul-01 10:45

Daniel Ferguson

13-Jul-01 10:45

I'd recommend using the date time picker control rather
than an edit box.

"das leid schlaft in der maschine" -Einstürzende Neubauten

Re: EDIT BOX

1-Oct-01 0:42

Ok.
But how can i initialize a date to the date time picker control ?

Microsoft Speech SDK V5.0

jerry0davis13-Jul-01 4:33

jerry0davis

13-Jul-01 4:33

I've been doing a bit of text-to-speech stuff using the Microsoft Speech SDK V5.0. What I'd like to do now, is distribute my app with the text-to-speech capabilities. However when installed, the installation program will also have to install the text-to-speech engine. I don't want to distribute the whole 110M worth of Speech SDK, so looking at the redistribution details, I need to install sp5ttint.msm, and spcommon.msm.

I can't actually find these two files. I've look on my system, and in the SDK cab file, and can't find them. I may just be thick, or blind, but does anyone know either how to install the text-to-speech engine, or where I can find these files please? Confused | :confused:

Thanks

Listview Tooltip

Anthony988713-Jul-01 4:03

Anthony9887

13-Jul-01 4:03

I'm trying to add a tooltip for a listview control using SDK style programming. I want to display the tooltip based on the data displayed in the rows..I can't seem to find any code samples in achieving this process..

Re: Listview Tooltip

Derek Price13-Jul-01 5:23

Derek Price

13-Jul-01 5:23

I'm not sure if this is what you want, but this is what I've used for my listviews:

const int LVS_EX_LABELTIP = 0x00004000;
ListView_SetExtendedListViewStyle(m_libraryPlans,LVS_EX_FULLROWSELECT | LVS_EX_LABELTIP);

Hope this helps!
Derek

ATL Comm band: a few problems

BigBear13-Jul-01 1:47

BigBear

13-Jul-01 1:47

Hi, I have been creating a band object for IE starting from a base created with the band wizard here: http://www.codeproject.com/atl/rbdeskband.asp
To the class created i have added a CWindowImpl derived class (CMainWindow) which replaces the default window object created by the wizard (HWND m_hWnd). This class is used as a container to handle the command messages created by a toolbar. This toolbar is a member variable of CMainWindow. There are a few things i wish to sort out but am unsure how:

Firstly if i close IE with my band still visible, when i load IE up again the band is still there as it should be however the toolbar is not loaded (or at least not visible nor clickable). The toolbar creation code is handled in the OnCreate method of the CMainWindow (which does get executed everytime, i checked). Has anyone else come across this? perhaps the code should be elsewhere.

Secondly I am wondering how to get a handle to the parent rebar that my band object is in so that I can add chevrons to my band (or is there a different way of adding chevrons?).

Thankyou in advance.

Mat.

Re: ATL Comm band: a few problems

Erik Thompson13-Jul-01 7:22

Erik Thompson

13-Jul-01 7:22

You could be having drawing problems because of the threading model you are using. If you are using my old wizard, there was a bug in it that the threading model was not getting set and thus you could only have one instance of the band at any time. Setting the threading model to apartment will fix this. You would look for this in the *.RGS file of your project.

As for the cheverons, the code in the SetSite method implementation gets the parent window handle that will allow you to do cheverons or what have you. This code is produced by the wizard by default and is near the middle of the function just before the call to RegisterAndCreateWindow. The parameter passed into the R&CW method is the handle to the rebar window.

Cheers,
-Erik
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
My thoughts are my own and reflect on no other.

timer

ov12-Jul-01 23:46

12-Jul-01 23:46

How can I check for timer's existance?
I can create a flag, set it with SetTimer and reset with KillTimer, but is the easier way exist? I'm using a pure API.

With the best regards, Vitaly.

Re: timer

Tomasz Sowinski13-Jul-01 0:49

Tomasz Sowinski

13-Jul-01 0:49

I don't think there's any documented way of doing this. The funny thing is that if you create a second timer with given ID, the function returns TRUE, and GetLastError returns 0.

Tomasz Sowinski -- http://www.shooltz.com

Last Visit: 31-Dec-99 18:00 Last Update: 21-May-24 2:03

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