C / C++ / MFC Discussion Boards

Re: how to magnify the video

Blake Miller20-Aug-04 5:36

Blake Miller

20-Aug-04 5:36

Look at source code for ZoomIn developer utility ships with Visual C++.

Re: how to magnify the video

zahid_ash20-Aug-04 19:14

zahid_ash

20-Aug-04 19:14

hi,
Where can i get this xource code of Zoom in utility of VC++.

plz tell ,
and i want to use zoom in for video previewing that i m building with VC++ and directshow ....

thanx for help

Regards.

Re: how to magnify the video

Blake Miller23-Aug-04 4:20

Blake Miller

23-Aug-04 4:20

The ZoomIn is a utility that ships with visual Studio 6.0.
I am pretty sure the source code is available from the MSDN library.

Also take a look at PJ's code here:

http://www.codeproject.com/tools/imageviewer.asp

It has ability to zoom in as well.

Focus problem.

V.16-Aug-04 21:47

16-Aug-04 21:47

Hi,

In our project @ work we have a flex grid component. When you double click a cell you get in 'edit mode' and a dialog appears so you can type a value and if you press OK the cell gets this value. (They probably had their reasons to do it like that Confused | :confused:

)

I derived a class from this one with some extra features, but now it seems I have to click on the dialog again to get the focus on the dialog (after doubleclick) setting the focus to another cell in the grid! (if you would press OK the WRONG cell gets the value)

I have checked my code against the base class and there is nothing I can see that is significantly different.

In the OnInitDialog from the called dialog I set the focus to a control.

Question: How can I put focus ON the dialog and OFF the grid without an extra click? (which will set focus to another cell)

1 more note: I can type in my control no problem, so If you would press enter everything would be fine. It's just as if the mouse doesn't get there? Unsure | :~

I hope somebody can help me, tnx in advance!

"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: Focus problem.

V.16-Aug-04 22:47

16-Aug-04 22:47

OK, I found it:

<br />
	SendMessage(WM_LBUTTONDOWN);<br />
	SendMessage(WM_LBUTTONUP);<br />

and it seems to work. (pfew Smile | :)

)

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

Enter

Johnny Peszek16-Aug-04 21:21

Johnny Peszek

16-Aug-04 21:21

Hi!

In a dialog based application with a multiline edit box I’m trying to count the number of enter hits. I tried to use code like this:

void CNanoDlg::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if(nChar==VK_RETURN)
{
counter++;
}

CDialog::OnChar(nChar, nRepCnt, nFlags);
}

The code doesn’t work.

Any Ideas?

Thanks in advance.

Re: Enter

V.16-Aug-04 21:34

16-Aug-04 21:34

Do this:

message map:

	<br />
ON_WM_GETDLGCODE()   <br />

header file:

<br />
afx_msg UINT OnGetDlgCode( );<br />

in code:

<br />
UINT CtrlFlexArray::OnGetDlgCode(){<br />
	return DLGC_WANTALLKEYS;<br />
}		//end function OnGetDlgCode<br />

good luck.

"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: Enter

Johnny Peszek17-Aug-04 2:32

Johnny Peszek

17-Aug-04 2:32

I almost got it. But when I press enter or any different key in the edit box the function OnGetDlgCode()
returns always the same result so I’m not able to count enter hits. Am I missing something?

Regards.

Re: Enter

V.17-Aug-04 3:53

17-Aug-04 3:53

I dunno,

Do you handle your keystrokes in OnKeyDown (or Up) messagehandler?

in message map:
ON_WM_KEYDOWN()

in header:
afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
in code:

void yourclas::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags){<br />
//your code here<br />
}

if you do have this I wouldn't know, what you could have forgotten.

Hope this helps.

"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: Enter

Johnny Peszek17-Aug-04 9:23

Johnny Peszek

17-Aug-04 9:23

The code that you wrote works fine in SDI or MDI application. But I have dialog based application with edit box in which I want to count enter hits.

Re: Enter

V.17-Aug-04 21:46

17-Aug-04 21:46

Try adding a button to your dialog,
set it as default button and make it invisible.

(note: it could take the ESC button too)
(note: if it doesn't work, set it's focus explicitly)

just an idea, hope it works.

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

Difference Btw Win32 and MFC programming

zahid_ash16-Aug-04 18:36

zahid_ash

16-Aug-04 18:36

HI,

Plz tell me differnce between Win32 and MFC programming

thanx

Regards.

Re: Difference Btw Win32 and MFC programming

kailai_nishanth16-Aug-04 19:33

kailai_nishanth

16-Aug-04 19:33

Win32 is the programming interface to Windows, including all the Windows functions.

MFC is an application framework that includes much of the Win32 functionality, and a lot more.

On File-> New (Project) Win32 application and MFC wizard

zahid_ash16-Aug-04 19:57

zahid_ash

16-Aug-04 19:57

thanx
but i want to know

When we use File ->New(PRoject tab)
there r options many ....

wts there differece win32 application and MFC wizard,

is that we can not use MFC classes in Win32 application or some else

thanx

Regards.

Re: On File-> New (Project) Win32 application and MFC wizard

kailai_nishanth16-Aug-04 20:51

kailai_nishanth

16-Aug-04 20:51

Check the following links
FOR MFC:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_overview.3a_.creating_an_mfc_exe_program.asp

FOR WIN32:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcgrfoverviewwin32appwizard.asp

Re: On File-> New (Project) Win32 application and MFC wizard

David Crow17-Aug-04 5:32

David Crow

17-Aug-04 5:32

Per MSDN:

MFC is an "application framework" for programming in Microsoft Windows. Written in C++, MFC provides much of the code necessary for managing windows, menus, and dialog boxes; performing basic input/output; storing collections of data objects; and so on. All you need to do is add your application-specific code into this framework. The MFC framework is a powerful approach that lets you build upon the work of expert programmers for Windows. MFC shortens development time; makes code more portable; provides tremendous support without reducing programming freedom and flexibility; and gives easy access to "hard to program" user-interface elements and technologies.

The Win32 application programming interface (API) defines the 32-bit members of the Windows operating system family from the programmer's point of view. Some members of the Windows family use the entire Win32 API, while others use subsets. MFC encapsulates, or "wraps," much of (but not all of) the Win32 API. In general, MFC supplies classes representing key Windows objects, such as windows, dialog boxes, brushes, pens, and fonts. The member functions of these classes wrap most of the important Win32 API functions associated with the encapsulated object. That is, the MFC class member function calls the Win32 API function.

With Visual C++, you can program for Windows using either C or C++ and the Win32 API, or using C++ and MFC.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Difference Btw Win32 and MFC programming

ThatsAlok17-Aug-04 0:49

ThatsAlok

17-Aug-04 0:49

Actually,let me explain the diffence between them in wasy way.
i think you know dosbased c and c++ before going for the MFC and win32 api.
here is the solution,
you can win32 api as windows based c and mFC as Windows Based c++.
basically as dos based c is more close to system same way win32 are more close to system and dos based c++ is oops based same way the mfc is oops based.

and as you know c++ use wrappper of c to provide easy handlling of function ,same way mfc provide wrapper some commonly used win32 api function,i think that enough.
if you want more search CP

-----------------------------
"I Think It will Work"
Formerly Known As "Alok The Programmer" at CP
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

CRC/checksum for a group of files

Anthony_Yio16-Aug-04 17:54

Anthony_Yio

16-Aug-04 17:54

Hello,

I have a group of files, how do I check the integrity of the files with a the given value which summarize the files content. For a single files, I know there are CRC. But how about a group files?
Any proven methods?

thanks

Sonork 100.41263:Anthony_Yio

Re: CRC/checksum for a group of files

Antony M Kancidrowski17-Aug-04 0:42

Antony M Kancidrowski

17-Aug-04 0:42

The only way I have seen a group of files checked is with an additional SFV file.

I believe it uses CRCs for each file in the set. A search for SFV on google may help you out.

Sorry I can not be any more help as I have not used them myself.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Anti-alias w/ GDI NOT GDI+

Tony Teveris16-Aug-04 16:46

Tony Teveris

16-Aug-04 16:46

Does anyone have a way of drawing with the GDI API (LineTo, ArcTo, etc) and create anti-alising (smoother looking vectors) ? Adobe Illustrator, CorelDraw do it, are they drawing to an off screen image and bitblting ? or is there some other way ? I don't want to use GDI+

Thanks in advance

Tony Teveris
Gerber Scientific Products
Senior Software Engineer
Phone: 860 648 8151
Fax: 860 648 8214
83 Gerber Road West
South Windsor, CT 06074

Here's a good one.

JD Steffen16-Aug-04 15:58

JD Steffen

16-Aug-04 15:58

Okay here's a problem I am having:

I create a pointer to a char like so:

char *test = new char;

then I pass that pointer to a class member function which fills it with data from a file. Heres the code for that:

bool FileManager::ReadString(LPSTR StringData)
{
char SingleChar;
bool done = false;

while (done != true)
{
if(ReadData(&SingleChar, 1)==2)
{
return true;
}

switch (SingleChar)
{
case 10:
case 13:
{
done=true;
}break;
default:
{
*StringData = SingleChar;
StringData++;
}break;
}
}
*StringData = 0;
StringData++;
return true;
}

Then afterwards in the function that called the member function I do a:

delete test;

When it runs this piece of code I get:

Debug Error!

Program: c:\JD's Projects\FileManager\Debug\FileManager.exe

DAMAGE: after Normal block (#38) at 0x00851FC0.

Any Ideas?

thanks,
JD

Re: Here's a good one.

Rory Solley16-Aug-04 21:27

Rory Solley

16-Aug-04 21:27

Your test variable is a pointer to a SINGLE char value. If you want to store an array of chars i.e. a string, you will have to declare an array:

char* pArray = new char[NumChars + 1];

where NumChars is the number of characters you want to store. If you don't know in advance how many you want to store, pick a large constant value. Note the extra one added to accommodate the null-terminator at the end of the string. This is a style issue, you may wish to include the null-terminator in the NumChars count.

Now when you use your pointer arithmetic:

StringData++;

you will be using valid allocated memory. Remember that when you come to deallocate an array, the syntax is as follows:

delete []pArray; // Note the square brackets

On a related note, you might want to look at the standard library's basic_string<> template (STL). use MSDN - it can simpify string handling a great deal and is a good way to learn about templates.

Hope that helps.

Winsock 2: Local IP address

wooden0jesus16-Aug-04 14:25

wooden0jesus

16-Aug-04 14:25

I'm working on a program that at one point needs to display the user's "public" IP address. I'm sure I'm forgetting the technical name for this, so for now "public" will have to do. Assuming their running through a router, all the techniques I know will return addresses like 192.168.1.100 or something similar provided by their router. How do I find (programatically) one IP address as seen by external sites?

Thanks!

Re: Winsock 2: Local IP address

Antony M Kancidrowski16-Aug-04 22:56

Antony M Kancidrowski

16-Aug-04 22:56

Assuming the router supports SNMP. You will have to interogate the routers routing table in order to determine the public ip addresses used.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

RegRestoreKey huge delay on 2003

farby16-Aug-04 11:57

farby

16-Aug-04 11:57

Hello,
it seems something has drastically changed on Windows 2003, if we write to the registry.

I was using the code example from JOHN11 (How to Save and Restore Registry Keys) which is working without any problems on Windows 2000.
If I use the same tool on 2003, export the registry to a file works fine, but importing takes very long. (using option "/R" from JOHN11's tool) The function "RegRestoreKey" hangs some how. I was using the same registry key (which was generating about an 8 MB file). No problems on 2000 (about 30 seconds). On windows 2003 the function returned after about 15 minutes.
I was also chaning the possible parameters without success (REG_NO_LAZY_FLUSH)

Do you have any clue if there is a new "registry" feature on 2003 which delays the "RegRestoreKey" ?

Can we tune this somewhere?

Thanks a bunch for your hints!

Best regards

Farby

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