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I make member functions static for a few reasons:
1. Entire class is composed of static functions and there is NO member data. No need to make an instance.
2. The static member function is used as a placeholder for a callback, the static function accepts data (such as the ubiquitous LPVOID or LPARAM) and casts it to a pointer of the class and then calls a non-static member function. This is very common to convert a parameter to _beginthreadex, for example, into a class' instance. Also, some Windows API callbacks allow you to pass 'user' data, which I usually make a pointer to a class.
3. The static function returns the pointer to the singleton class' instance.
No knowing much more about the class or its history, it seems like the class you describe needs some serious refactoring. Maybe it was a submission to the 'Obfuscated C++ Code Contest' 
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Three very good reasons for making a class or member static. In this case, I suspect that some unknown history was at work here. The callback is a possibility that I will look at today. The code uses winsock.h extensively and so there may be some dependancy on this that I've overlooked. And I will be doing some serious refactoring in order to remove the memory leaks.
Thanks for the comments to all. 
Chris Meech
I am Canadian. [heard in a local bar]
Remember that in Texas, Gun Control is hitting what you aim at. [Richard Stringer]
Nice sig! [Tim Deveaux on Matt Newman's sig with a quote from me]
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I need to get data from that Win32_PerfFormattedData_PerfProc_Thread class. How can I do that?
I need to get detailed info about thread.
Thanks.
Alex
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There is an article about WMI on CodeProject!
Don't try it, just do it! 
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HRESULT hr;
_variant_t v;
ULONG ulReturned;
DWORD dwAuthLevel;
IWbemLocator *pLocator;
IWbemServices *pService = NULL;
IEnumWbemClassObject *pEnum = NULL;
IWbemClassObject *pClass;
hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *) &pLocator);
if (S_OK == hr)
{
hr = pLocator->ConnectServer(_bstr_t(L"root\\cimv2"), NULL, NULL, NULL, NULL, 0, NULL, &pService);
if (WBEM_S_NO_ERROR == hr)
{
hr = CoQueryProxyBlanket(pService, NULL, NULL, NULL, &dwAuthLevel, NULL, NULL, NULL);
hr = CoSetProxyBlanket(pService, RPC_C_AUTHN_DEFAULT, RPC_C_AUTHZ_NONE, NULL, dwAuthLevel,
RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE);
hr = pService->CreateInstanceEnum(_bstr_t("Win32_PerfFormattedData_PerfProc_Thread"),
WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY, NULL, &pEnum);
if (WBEM_S_NO_ERROR == hr)
{
do
{
hr = pEnum->Next(WBEM_INFINITE, 1, &pClass, &ulReturned);
if (WBEM_S_NO_ERROR == hr)
{
hr = pClass->Get(L"Caption", 0, &v, NULL, NULL);
if (VT_NULL != v.vt)
TRACE("Caption = %s\n", V_BSTR(&v));
}
} while (WBEM_S_NO_ERROR == hr);
pEnum->Release();
}
pService->Release();
}
pLocator->Release();
}
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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Thanks a lot. Thats what I need.
Alex
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Is there an easy way to hide the taskbar button of an application. I found an MSDN article which makes the window a child of an invisible window. Has anyone found another way to hide the button that is a little less complicated?
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Can anyone tell me how to write a change of color in c++ for a program running in ms-dos?
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Better use QBasic 
Don't try it, just do it!
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Change the color of what? Have you seen this API?
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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Dear All
I am a student of BS(CS).
I am doing my final project and thesis. I need some
help regarding my project
The Project title is:-
"Display Enlargement using Multiple Monitors and Image
Enhancement"
The objective is to make a software that can split
the primary monitor's display on 4 other monitors
(that are secondary monitors) shch like if we placse 4
moniters like a matrix they will show the same display
as primary monitor's display
Primary Moniror and secondary monitors are attach with
a single system unit that has 5 VGA Cards .
I am also sending u a jpg file that can help you to
illutrate the problem
The purposed solution where i have thought is make
resoloution 800 x 600 of primary monitor
and assign 400 x 300 to other secondry monitors.
But problem is that
1:- How can i detact VGA Cards
2:- How can capture video stream from one VGA and to Split or collect specific coordinates and sent this to other VGA's
3:- How can i change the resoloution of different in my program
4:- how can i assign them this resoloution.
If u find any information regarding this
please tell me OR If you have any new solution regarding this
please send me information and code as well on my e-mail touqeer_khan@yahoo.com.
The solution Should be in Visual C++ OR in Visual Basic
Thanking n anticipation.
Take Care
Regards
Touqeer
I will very thank ful to you for this consideration
Regards
Touqeer
Touqeer_khan@yahoo.com
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My app registers filetype ".xyz" so that opening "fred.xyz" automatically
opens the data file in our app.
However ... if I click on a link to "fred.xyz" in internet explorer, it
simply opens it as text (.xyz is a text format). What additional steps are
needed to enable IE to launch my app when someone clicks on a link to
"fred.xyz" ?
Many thanks,
Steve
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How did you go about registering the .xyz extension?
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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SetRegKey(HKEY_LOCAL_MACHINE, _T("software\\microsoft\\windows\\currentversion\\app paths\\MYPROG.EXE"), szPathName);<br />
SetRegKey(HKEY_LOCAL_MACHINE, _T("software\\microsoft\\windows\\currentversion\\app paths\\MYPROG.EXE"), szPath, _T("Path"));<br />
<br />
DelRegTree(HKEY_CLASSES_ROOT, _T("MyProg.File"));<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File"), _T("MyProg File"));<br />
<br />
CString szDefaultIconCommandLine;<br />
szDefaultIconCommandLine.Format(_T("%s,-%d"),szPathName,UI_CONFIG_DOCFRAME_ID);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\DefaultIcon"), szDefaultIconCommandLine);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\QuickView"), _T("*"));<br />
<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\open\\ddeexec"), _T("[open(\"%1\")]"));<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\print\\ddeexec"), _T("[print(\"%1\")]"));<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\printto\\ddeexec"), _T("[printto(\"%1\",\"%2\",\"%3\",\"%4\")]"));<br />
<br />
CString szPathDDE = szPathName + _T(" /dde");<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\open\\command"), szPathDDE);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\print\\command"), szPathDDE);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\printto\\command"), szPathDDE);<br />
<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\open\\ddeexec\\application"), szApplicationKeyValue);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\print\\ddeexec\\application"), szApplicationKeyValue);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\printto\\ddeexec\\application"), szApplicationKeyValue);<br />
<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\open\\ddeexec\\topic"), szTopicKeyValue);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\print\\ddeexec\\topic"), szTopicKeyValue);<br />
SetRegKey(HKEY_CLASSES_ROOT, _T("MyProg.File\\shell\\printto\\ddeexec\\topic"), szTopicKeyValue);<br />
<br />
SetRegKey(HKEY_CLASSES_ROOT, _T(".xyz"), _T("MyProg.File"));
a few names have been changed, etc
Any clues?
Steve
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I have an unmanaged C++ project that is largely complete. Up to this point I have used a CVS repository on my local machine to do version control.
I would like to run a series of tests on some past versions of the project, however only the source itself is part of the repository and I can't use the old .vcproj files.
If I check out an old version of the code and add it to a new project, it behaves very differently - sluggish response, takes a lot longer to load and there are different things shown in the output window when debugging. I've changed as many settings as I can think of (it's a multithreaded project, and uses winmm.lib for MIDI etc.) and as far as I can see I've taken this into account. Is there any way I can copy the current project settings, or even the current project file itself and use that without it complaining that most of files no longer exist in the older versions?
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hello friends
i m making my project's backend in vc++ and i want to use gui in VB. so plz guide me that how i can wrap these coding through com wrapper
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smarty12 wrote:
i m making my project's backend in vc++ and i want to use gui in VB. so plz guide me that how i can wrap these coding through com wrapper
Make A Com/ATL DLL!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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if you write like following code:
while(1)
{
create a instance of _CommandPtr
create a sql statement and bind it to command object
set command object's prepared attribute to false
execute the command
destroy the command object
......
}
if we use above code and use the same sql statement for command object to run, I want to know whether the db server will cache the sql, i.e. db will not parse the sql every time.
If we change the setting of the prepared attribute to true, whether the db will parse the sql statement?
Thanks.
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I have created a dialog and it's corresponding class, but when I call DoModal(), the dialog does not appear. DoModal returns -1, and GetLastError() returns 1812.
I'm not sure what these codes mean, any help is appreciated.
-Alan
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MSDN says error 1812 is:
1812 The specified image file did not contain a resource section. ERROR_RESOURCE_DATA_NOT_FOUND
Artificial intelligence is no match for natural
stupidity.
Never argue with an idiot. They will drag you down to their level where they are an expert.
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Try using the "Error Lookup" application that comes with Visual Studio (it's also part of VC6). For 1812, it sounds like the resource for the dialog was not found. This can happen if you manually edit resource.h. Try doing a 'build all' ("rebuild solution" in VS.NET parlance).
Software Zen: delete this;
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Hi I'm italian (sorry for my bad english)
I create a small program that with IFFT and directsound (using CSoundManager & CSound class) make a sound....
After IFFT routine i have an array:
short psOutData = new short[ lSamplesPerSec ];
where there is a wave. I create a CSound class:
ULONG uDataSize = lSamplesPerSec * sizeof( short );
g_pSoundManager->CreateFromMemory( &g_pSound, (BYTE*)psOutData, uDataSize,
pwfx, DSBCAPS_GLOBALFOCUS | DSBCAPS_CTRLPAN | DSBCAPS_CTRLFREQUENCY | DSBCAPS_CTRLVOLUME,
GUID_NULL, 1 );
g_pSound->Play( 1, 1 );
The sound are play correctly (looping)
I have the same problem if the strating level (psOutData[0]) is not 0 but a value...this cause a interference at the beginning.
But this problem is very ugly if I try to change the sound...
I take the sound buffer:
BYTE *pbData = NULL;
BYTE *pbData2 = NULL;
DWORD dwLength;
DWORD dwLength2;
LPDIRECTSOUNDBUFFER pDSB = g_pSound->GetBuffer( 0 );
I lock the buffer:
hr = pDSB->Lock(0, uDataSize, (void**)&pbData, &dwLength, (void**)&pbData2, &dwLength2, 0L );
than I copy a new psOutData (another wave sound) in the buffer:
memcpy( pbData, psOutData, dwLength );
hr = pDSB->Unlock( pbData, dwLength, NULL, 0 );
And new sound are played...but...a "tick" are produced when the new sound starting....why?
I think because the starting level of new wave is different to the play point of old wave...this "jolt" can produce a strange effect during the changing?
How can I do?
There is a method for to avoid this problem?
I hope that someone has understood my problem (I know my english is terrible  )...
Thanks to all.
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the "tick" (or click) which you hear at the beginning of your sound is absolutely normal. If you listen carefully, you will also hear a click at the end of your sound eg. when playing a noise. The reason is, that your loudspeaker membrane goes from zero deflection abruptly to a hughe deflection or the other way around at the end of your sound. If you change the sound it is the same. You change the deflection very abruptly. This will always cause a click.
To prevent this effect, one usually "ramp" the signal (kind of fading). A cosine square ramp at the beginning and at the end of your signal will prevent this click (rise ramp:-pi/2 to 0; decay ramp: 0 to pi/2). 5ms ramp duration each should be enough. You can also use a linear rise/decay ramp of this duration. It is not as good as the cosine sqaure ramp but maybe it is a little bit easier to program.
Good luck
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