Re: RegQueryValueEx fails, but why? - C / C++ / MFC Discussion Boards

(Resolved): Problem of load icon in dialog box.

Le@rner29-Mar-08 2:44

Le@rner

29-Mar-08 2:44

thanks. now my problem is resolved

Can MFC call a WTL DLL with CString params?

DaveB229-Mar-08 2:03

DaveB2

29-Mar-08 2:03

Just posted this question
http://www.codeproject.com/script/Forums/View.aspx?fid=4486&msg=2485460[^]

Not sure if it belongs here on in WTL forum... so this is a cross pointer... hope I'm not breaking protocol (newbie here, sorry)

DaveB

A crisis with string table

ganesa moorthy29-Mar-08 2:00

ganesa moorthy

29-Mar-08 2:00

How to change the language settings of a string table - in order to hold chinese characters. I have gone mad Cry | :((

of trying to work it out.

I need to copy the chinese string into the string table and i need to use the same in my project.

Thanks in advance Rose | [Rose]

Thanks a lot

Re: A crisis with string table

Michael Schubert29-Mar-08 4:00

Michael Schubert

29-Mar-08 4:00

Where are you trying to change it? In the VS6 resource editor for example you right-click on the stringtable in Resource View -> Properties -> Language.

RegQueryValueEx fails, but why?

Vimvq198729-Mar-08 1:19

Vimvq1987

29-Mar-08 1:19

Today I wrote some code for my program. Unfotunately, it didn't work, and the reason was RegQueryValueEx failed Frown | :(

Please check my code and help me to determine why it's fail.

DWORD dwType = REG_DWORD;
DWORD dwLength = sizeof(DWORD);

HKEY hkey;
long lres = RegOpenKeyEx(HKEY_LOCAL_MACHINE,_T("Software\\DeltaX\\TicTacToe"),0,KEY_QUERY_VALUE|KEY_SET_VALUE,&hkey);
if(lres!=ERROR_SUCCESS)
{
lres = RegCreateKeyEx(HKEY_LOCAL_MACHINE,_T("Software\\DeltaX\\TicTacToe"),0,NULL,
REG_OPTION_VOLATILE,
KEY_SET_VALUE|KEY_QUERY_VALUE,
NULL,
&hkey,
NULL);
}

lres = RegQueryValueEx(hkey,TEXT("DifficultLevel"),NULL,&dwType,(PBYTE)&dwMode,&dwLength);
if ((lres!=ERROR_SUCCESS))
{
dwMode = 1;
RegSetValueEx(hkey,TEXT("DifficultLevel"),NULL,REG_DWORD,(LPBYTE)&dwMode,sizeof(DWORD));
}

RegCloseKey(hkey);

everything seems to be fine, but nothing's done. dwMode var gets 0 value, and I don't know why Frown | :(

I checked the registry, and the value of dwMode is OK.

Please tell me why Smile | :)

Thanks in advance

Re: RegQueryValueEx fails, but why?

Michael Schubert29-Mar-08 4:23

Michael Schubert

29-Mar-08 4:23

The code you provided never sets dwMode to 1

Maybe it should be:

if ((lres==ERROR_SUCCESS))
{
dwMode = 1;
RegSetValueEx(hkey,TEXT("DifficultLevel"),NULL,REG_DWORD,(LPBYTE)&dwMode,sizeof(DWORD));
}

Re: RegQueryValueEx fails, but why?

Vimvq198729-Mar-08 4:38

Vimvq1987

29-Mar-08 4:38

Thank you, but you don't understand my code. In case that RegQueryValueEx fails (cause of something such as the value doesn't exit, etc), my program will re-create that value for later run.

Anyway, I changed my code and now it works well.

lres = RegQueryValueEx(hkey,TEXT("BoardSize"),0,&dwType,(PBYTE)&dwSize,&dwLength);

Thank you all! Smile | :)

Re: RegQueryValueEx fails, but why?

David Crow30-Mar-08 2:59

David Crow

30-Mar-08 2:59

Vimvq1987 wrote:
...RegQueryValueEx failed . Please check my code and help me to determine why it's fail.

I see no call to GetLastError(). Why?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

auto_ptr in exception safety design

George_George29-Mar-08 0:54

George_George

29-Mar-08 0:54

Hello everyone,

What I am confused is about,

http://www.gotw.ca/gotw/059.htm

--------------------
Indeed, often the best way to implement the Pimpl idiom is exactly as shown in Example 4 above, by using a pointer (in order to take advantage of nonthrowing operations) while still wrapping the dynamic resource safely in an auto_ptr manager object. Just remember that now your object must provide its own copy construction and assignment with the right semantics for the auto_ptr member, or disable them if copy construction and assignment don't make sense for the class.
--------------------

1. What means "the right semantics for the auto_ptr member"?

2. "disable" means for the class, copy construction and assignment are not needed? Curious. Never thought of a class which does not need that two basic functions. Smile | :)

thanks in advance,
George

Re: auto_ptr in exception safety design

CPallini30-Mar-08 2:55

CPallini

30-Mar-08 2:55

George_George wrote:
1. What means "the right semantics for the auto_ptr member"?

Right semantics means: "a copy constructor and a assignment operator that make sense for that class", I think. Maybe a deep member copy, maybe different.

George_George wrote:
2. "disable" means for the class, copy construction and assignment are not needed? Curious. Never thought of a class which does not need that two basic functions.

For instance a Singleton.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: auto_ptr in exception safety design

George_George30-Mar-08 19:03

George_George

30-Mar-08 19:03

Hi CPallini,

I lost your context, "maybe different" is different for what? Any more descriptions?

regards,
George

Re: auto_ptr in exception safety design

CPallini30-Mar-08 21:24

CPallini

30-Mar-08 21:24

Well, suppose, for instance, you design a rather complex class (maybe a graphic tool). The class may cache some info to speed up computations. The cached info is part of class internal data but it isn't independent info and should be skipped by assignment operator.
Smile | :)

Re: auto_ptr in exception safety design

George_George30-Mar-08 22:19

George_George

30-Mar-08 22:19

Thanks CPallini,

Question answered.

regards,
George

regarding Visual Studio 2005

rowdy_vc++29-Mar-08 0:28

rowdy_vc++

29-Mar-08 0:28

hi

I have one source code (it was developed visual studio .NET 2003) but i have only VS2005 but visual studio 2005 does not compiling this source code why?
how to solve this problem?

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: regarding Visual Studio 2005

rp_suman29-Mar-08 1:48

rp_suman

29-Mar-08 1:48

Hi,

Refer this article: Upgrade Projects from Previous Versions of Visual C++[^]

Best Regards,
Suman

--
"Programming is an art that fights back!"

Re: regarding Visual Studio 2005

Mark Salsbery29-Mar-08 7:05

Mark Salsbery

29-Mar-08 7:05

If you still have trouble after reviewing the migration documentation, please
post the errors you''re seeing - verbatim! It's much easier to help that way Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Problem with wndTopMost in Vista

creatman28-Mar-08 23:35

creatman

28-Mar-08 23:35

Hi!

I have a problem with TopMost window on Windows Vista.
In Dialog's OnInitDialog method I try to set position by the following code

<br />
<br />
    int cx, cy; <br />
    HDC dc = ::GetDC(NULL); <br />
    cx = GetDeviceCaps(dc,HORZRES) + <br />
        GetSystemMetrics(SM_CXBORDER); <br />
    cy = GetDeviceCaps(dc,VERTRES) +<br />
        GetSystemMetrics(SM_CYBORDER); <br />
    ::ReleaseDC(0,dc); <br />
<br />
//Put window on top and expand it to fill screen<br />
	SetWindowPos(&wndTopMost, <br />
        -(GetSystemMetrics(SM_CXBORDER) + 2), <br />
        -(GetSystemMetrics(SM_CYBORDER) + 2), <br />
        cx+5,cy+5, 0); <br />

that works fine in XP - dialog is realy top most, but on Vista sometimes it is not - some active windows like Firefox can be above of my dialog. I can't understand where is the problem here and how can it be fixed?

Re: Problem with wndTopMost in Vista

rowdy_vc++29-Mar-08 1:31

rowdy_vc++

29-Mar-08 1:31

hi i need some extra explains from u ..

1. What's the error u get it from Windows vista?

2. Which type of compiler u used like VS2005 r some thing..?

give the answer for above questions..

and also try install service pack for windows vista and then u compile it

i think it's may be working fine .
Actually windows vista is one of the poor OS in this world ..but we ll try our level best!!

*****THANKS N ADVANCE****
Mathen.K
(I WILL TRY MY LEVEL BEST )

Re: Problem with wndTopMost in Vista

creatman29-Mar-08 7:28

creatman

29-Mar-08 7:28

hi, thanks for answer.

1. I did not get any visual errors, I've got only strange behavior of the windows on screen. I set for my window TOPMOST order, but in OS it actually appears under any current active window on the screen.

2. I use VC2005.

I found some interesting topic on this problem: http://groups.google.com/group/microsoft.public.vc.mfc/browse_thread/thread/8c9333777d461126/c5ee093565701048[^]

What's the newest Platform SDK VC6 can use under Windows XP? [modified]

followait28-Mar-08 23:03

followait

28-Mar-08 23:03

and develop applications for Windows XP?

I've used Windows XP SP2 Platform SDK for several months, there are some incomptible problem, like CFileDialog crashing.

I wonder if there is a more compatible one.
What about Windows Server 2003 R2 Platform SDK?

Thanks.

modified on Saturday, March 29, 2008 5:48 AM

Re: What's the newest Platform SDK VC6 can use under Windows XP?

Randor 30-Mar-08 16:40

Randor

30-Mar-08 16:40

Windows Server 2003 R2 Platform SDK February 2003 Edition is the last version compatible with VC6. I cannot tell you if your problems will go away however.

Best Wishes,
-David Delaune

Re: What's the newest Platform SDK VC6 can use under Windows XP?

followait30-Mar-08 18:08

followait

30-Mar-08 18:08