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Phil.Benson wrote: If used correctly...
That's a mighty big if there. The problem is that most beginners do not use it correctly and end up butchering their code just to get around its caveats. I find it best to avoid altogether. GetWindowText() and SetWindowText are a lot cleaner and you can tell exactly what is going to happen. Using UpdateData() is an all-or-nothing operation.
Consider the situation where you set some member variables, call a dialog's DoModal() method, call UpdateData(), then click the Cancel button. Now the member variables are potentially not in the same state they were prior to calling DoModal(). You should be able to assume that member variables retain their same value before and after if the Cancel button has been clicked. Use of UpdateData() makes this a bad assumption.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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David wrote
"That's a mighty big if there. The problem is that most beginners do not use it correctly..."
Nobody said programming is easy. If it was, we would not get paid as much 
As for choosing Cancel, do you manipulate application data directly within the dialog? Or do you wait for the result (IDOK or IDCANCEL) before making any changes resulting from the data being changed within the dialog?
again, just my tuppence
Phil
bum... and I thought I´d got rid of all the bugs 
-- modified at 9:43 Tuesday 14th March, 2006
Here on code project, If I can remember correctly it was PJ Ahrens, has written an interesting article about DDX-DDV in the MFC
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I need to integrate Activex control(OCX) object into ATL COM Server DLL project. I created a dialog in my the project and added activex control. After adding the ActiveX control my other parts of the program are not working properly. The COM DLL calls CoCreateInstance() to connect to another component. At this point it hangs. If I remove the ActiveX object from the project everything works fine. Do you guys have any idea?
kars82
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Hi again
i have another simple question
i'm doing the following
string text;
int lenght=text.lenght;
compilation error::
error C2440: 'initializing' : cannot convert from 'unsigned int (__thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::*' to 'int'
Conversion is a valid standard conversion, which can be performed implicitly or by use of static_cast, C-style cast or function-style cast
Error executing cl.exe.
What is the problem i've seen this in many codes what is wrong with mine
Thanks in advance
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antonaras_marcou wrote: string text;
int lenght=text.lenght;
string text;
int nLength = text.length();
Nibu thomas
Software Developer
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Thanks Nibu thomas
appriciate the help
it's working fine now
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They didn't do the beginners any good with this stupid property-notation in the Hype-languages.
"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."
-- Caius Petronius, Roman Consul, 66 A.D.
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To Whom it may concer:
I have a serious issue with the development under MS Exchange Database using unmanaged C++. I would really appreciate ( for a bootle of BEAR if you live in Kyiv, Ukraine) if someone can provide me with the documentation and/or samples of such code.
Thank you in advance!
For more info please advice
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hi!! is any1 familiar wiz openGl? I want to integrate terrain codes which r in openGL in MFC n am having sm problem.. cud any1 plz help me
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You could go to the website nehe.gamedev.net/ you will find some good tutorials on opengl at this site. 
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adiilah wrote: I want to integrate terrain codes which r in openGL
as mentioned go to Nehe.... if the issue is how to do terrains in OpenGL, go here: http://www.vterrain.org/LOD/Implementations/index.html[^]
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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What do you exactly mean by "terrain codes in OpenGL" ?
SkyWalker
-- modified at 14:48 Tuesday 14th March, 2006
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Hello People,
I want to paint the caption bar dynamically with color of my choice. The Font and Color of the Caption Bar text should change.
Besides, I also want to change the border color to match the Caption Bar Color.
Has Anyone done this earlier?
Any help on this?
Sukant Tiwary
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maybe it is some helpful to you
http://www.codeproject.com/dialog/skinedcaptionbars.asp
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After repeated database operations while opening closing a child window of a dialog applications, a message box will pop up saying "Too many client tasks. Driver's SQLSetConnectAttr failed". I am a beginner in mfc/C++ programming and need this program runnning ASAP and any help would be appreciated. thanx
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For every connection that you create, there must be a matching destroy. Why not just create one connection when the application is started, and destroy it when the application closes? Creating a connection to a datasource can be a very costly operation.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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The code given below works fine as long the mouse is on the application dialog,
but as it leaves the dialog mouse position coordinates do not change.
I have set hook as under;
pfnMyMouseMonitor = (HOOKPROC)MouseProc;
hMouseHook = ::SetWindowsHookEx(WH_MOUSE,pfnMyMouseMonitor,(HINSTANCE) NULL, GetCurrentThreadId());
Mouse function is as under
LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
MOUSEHOOKSTRUCT* pms = (MOUSEHOOKSTRUCT*)lParam;
//pms->
if (nCode == HC_ACTION)
{
str.Format("x = %d : y = %d",pms->pt.x ,pms->pt.y);
px->SetWindowText(str); // px is pointer to static control on dialog
}
return(::CallNextHookEx(hMouseHook, nCode, wParam, lParam));
}
I donot want to use dlls.
Thanks in advance.
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u can't put a globel mouse hook unless u put the hook function in a dll.
In this case in order to get the window text below, use
SetCapture()
nave
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The system function call waveInGetPosition retrieves the current input position of the given waveform-audio input device. The function call returns the position in the parameter MMTIME in the given format. (if possible)
In my application I use the TIME_SAMPLES format wich specifies the current position in an offset in samples since the last time the waveform-audio input device was reset.
My question is: What would happen if a recording gets to long (nSamples>(2^32)-1).
I think it just simply wraps around the current position but I am not sure about this. (I have never tried) And it would take me about 12 hours to figure out by myself. (4294967296/96000/3600=12.43) 
Thanks.
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Hai to all,
Can anybody understand this function can you please explain me. by using this function the size of the image we are storing is increasing the size. I have to reduce that size. I am unable to find what to do. with out using this function the size of the image is 40kb and after using this function it size become 622kb. I am using Black and while image. I think by reading any image by Gdiplus Image function it will take it into color mode. becoz of that it is taking large size.
If possible can tell me how to reduce the size of the image.
CLogEntry CDocImage::MergeSignRegions(LPCTSTR szSaveFileName, FocusSide nSide ) {
CLogEntry retcode;
CString csError ;
Bitmap *pbmBase = NULL ;
Gdiplus::Image *pImageIn = NULL ;
Status saveStatus ;
// Don't do anything if there is no sign regions for this side.
if ((nSide == Side1 && m_ptaSignRegions.GetSize() == 0) ||
(nSide == Side2 && m_ptaSignRegions2.GetSize() == 0))
return retcode;
TCHAR szTempPath[MAX_PATH] = "\0";
TCHAR szSigTempFile[MAX_PATH] = "\0";
TCHAR szBaseTempFile[MAX_PATH] = "\0";
if ( !::GetTempPath( MAX_PATH, szTempPath ) ) {
VXTRACE();
return CLogEntry("Failed to get temp path.", -1);
}
// Get the number of sign regions of this side
int nSignRegionCount = 0;
if (nSide == Side1)
nSignRegionCount = m_ptaSignRegions.GetSize();
else
nSignRegionCount = m_ptaSignRegions2.GetSize();
// Load the saved document image and merge all signatures
try {
CLSID encoderClsid ;
WCHAR wcFileName[_MAX_PATH*sizeof(WCHAR)] ;
WCHAR wcTempName[_MAX_PATH*sizeof(WCHAR)] ;
WCHAR wcSaveName[_MAX_PATH*sizeof(WCHAR)] ;
LPCTSTR pszFileName ;
CDC memDC, sigDC ; // memory DC into which main image will be loaded
HBITMAP hbm, hbmSig ;
memDC.CreateCompatibleDC( CDC::FromHandle( ::GetDC( NULL ) ) ) ; // .like display.
sigDC.CreateCompatibleDC( CDC::FromHandle( ::GetDC( NULL ) ) ) ; // .like display.
if ( nSide == Side1 )
pszFileName = m_szFilename ;
else
pszFileName = m_szFilename2 ;
//--- Read in document image, as a tif
mbstowcs( wcFileName, pszFileName, sizeof( wcFileName ) ) ;
pImageIn = new Gdiplus::Image( wcFileName, false ) ;
if (!::GetTempFileName(szTempPath, "BAS", 0, szBaseTempFile)) {
VXTRACE() ;
return CLogEntry( _T("Failed to get base temp path"), -1 ) ;
}
// Get the CLSID of the BMP encoder
if ( GetEncoderClsid( L"image/tiff" /*L"image/bmp"*/, &encoderClsid ) == -1 ) {
::DeleteFile( szBaseTempFile ) ;
VXTRACE() ;
return CLogEntry( _T("Cannot find encoder clsid for BMP encoder"), -1 ) ;
}
//--- Save the document image as a bmp
mbstowcs( wcFileName, szBaseTempFile, sizeof( wcFileName ) ) ;
pImageIn->Save( wcFileName, &encoderClsid, NULL ) ;
//--- Reload document as a GDI+ BMP Image
pbmBase = new Bitmap( wcFileName, false ) ;
PixelFormat pxfBase = pbmBase->GetPixelFormat() ;
//--- Put base document bitmap into memory dc
Status status = pbmBase->GetHBITMAP( NULL, &hbm ) ;
memDC.SelectObject( hbm ) ;
CDC adc ; // memory DC for result
CBitmap bmp ; // will contain the composite image
bmp.CreateCompatibleBitmap( &memDC, pbmBase->GetWidth(), pbmBase->GetHeight() ) ;
adc.CreateCompatibleDC( &memDC ) ;
adc.SelectObject( bmp.m_hObject ) ;
//--- Suck the composite image out of the assembly dc, into a bmp that we can use
adc.BitBlt( 0, 0, pbmBase->GetWidth(), pbmBase->GetHeight(), &memDC, 0, 0, SRCCOPY ) ;
CPalette *pPal = memDC.GetCurrentPalette() ;
Bitmap *pSigMap = new Bitmap( (HBITMAP)bmp.m_hObject, (HPALETTE) pPal->m_hObject ) ;
if ( GetEncoderClsid( L"image/tiff", &encoderClsid ) == -1 ) {
VXTRACE() ;
return CLogEntry( _T("Cannot find encoder clsid for tiff encoder"), -1 ) ;
}
//--- Create a 2-parameter array, for Compression and for Color Bit depth
EncoderParameters* pEncoderParameters = (EncoderParameters*) malloc(sizeof(EncoderParameters)
+ 1 * sizeof(EncoderParameter));
//--- Use LZW Compression instead of Group 4, since it works for color and G4 doesn't
ULONG ulCompression = EncoderValueCompressionLZW ;
//--- 24-bit seems to be the SMALLEST one that works here - it might be the image, since
//--- the encoder claims to work for smaller values, but disk space is cheep.
ULONG ulColorDepth = 24L ;
pEncoderParameters->Count = 2 ;
pEncoderParameters->Parameter[0].NumberOfValues = 1 ;
pEncoderParameters->Parameter[0].Guid = EncoderCompression ;
pEncoderParameters->Parameter[0].Type = EncoderParameterValueTypeLong ;
pEncoderParameters->Parameter[0].Value = &ulCompression ;
pEncoderParameters->Parameter[1].NumberOfValues = 1 ;
pEncoderParameters->Parameter[1].Guid = EncoderColorDepth ;
pEncoderParameters->Parameter[1].Type = EncoderParameterValueTypeLong ;
pEncoderParameters->Parameter[1].Value = &ulColorDepth ;
mbstowcs( wcSaveName, szSaveFileName, sizeof( wcSaveName ) ) ;
saveStatus = pSigMap->Save( wcSaveName, &encoderClsid, pEncoderParameters ) ;
if ( saveStatus != Ok ) {
VXTRACE() ;
csError.Format( _T("Bitmap::Save failed for %s, error %d"), szSaveFileName, saveStatus ) ;
return CLogEntry( csError, -1 ) ;
}
} catch ( Exception error ) {
csError.Format( _T("ImageMagick Exception: %s"), error.what() ) ;
retcode = CLogEntry( csError, -1 ) ;
}
//--- can't delete the temporary file used for the Bitmap object while that object still exists
if ( pbmBase )
delete pbmBase ;
if ( pImageIn )
delete pImageIn ;
if ( *szBaseTempFile ) {
if ( !::DeleteFile( szBaseTempFile ) ) {
csError.Format( _T("DeleteFile failed for %s, error %d"), szSigTempFile, ::GetLastError() ) ;
return CLogEntry( csError, -1 ) ;
}
}
VETRACE();
return retcode ;
}
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Every DHCP network has a DHCP server, and every DHCP server has a lease table. Every DHCP Lease table has a correlation of Mac to IP. I want to be able to access the information in the DHCP Lease Table without shutting down services. The Microsoft DHCP management console can do this, and the W2K3 admin pack (installed on a client computer) allows this to happen from a remote computer, so I know it can be done. Not all DHCP servers are Windows machines, some are Routers, some are Linux, etc. So is there a way of accessing the information in the Lease table regardless if it is on a Windows server, router, etc.? Could perhaps output the information to a .csv file in a temp folder for input/review for our program.
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hi friends,
I connect to any website via proxy. But I want to connect to site by bypassing proxy.
for connecting proxy use
INTERNET_OPEN_TYPE_PRECONFIG
from CInternetsession class
I want to connect it without using proxy. kindly give me a reply.
Regards
kedar
Girish
Software Developer
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Hello,
I have a LogIn Form which should close and destroy itself upon verification of password and username.
How can I link the text inputed to be verified from an Access file?.
Also,I want the logIn form to be closed and load a diferent Form (Not CDialog form). Any help is highly appreciated. Tks
new to Visual C++, bt we gonna make it catch-a-fi-er
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Hi Gurus,
I have an ActiveX control that has an Edit control inside. I have embeded this control in IE. the problem is when i try to delete some text in Edit control using backspace key the browser takes me to the previous page instead of Erasing the text in Edit control. Does any one know how to deal with this situation
please its urgent
thanks
Muhammad Azam
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I think it is because the browser gets the events first.
Subclass the Edit control, and you are good to go.
this is this.
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