Problems when converting from VC6++ to .Net - C / C++ / MFC Discussion Boards

Michael Dunn20-Dec-04 7:30

20-Dec-04 7:30

If the window you want to fade is a top-level window, use AnimateWindow() with the AW_BLEND flag.

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb

Re: Alphablend question

__makaveli__20-Dec-04 8:02

__makaveli__

20-Dec-04 8:02

Thanks for the reply, I tried AnimateWindow() before but I keep getting the error that it is an undeclared identifier even when I include windows.h as specified in the MSDN Library. What am I doing wrong?

Re: Alphablend question

Michael Dunn20-Dec-04 8:37

Michael Dunn

20-Dec-04 8:37

See the FAQ
2.2 I'm trying to call a Windows API, but the compiler gives an undeclared identifier error (C2065). Why?[^]

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb

Re: Alphablend question

__makaveli__20-Dec-04 8:39

__makaveli__

20-Dec-04 8:39

Cheers, I've cracked it now, just had to define the windows version.

A (simple) dialogs question

Dave Kerr19-Dec-04 23:17

Dave Kerr

19-Dec-04 23:17

Hi,

I have a dialog based MFC app. When a certain command line argument is passed to it, I want the dialog to be run initially invisible. How do I do this? PreCreateWindow isn't called for dialog boxes, and I've tried all sorts of other ways (calling ShowWindow(SW_HIDE) in OnInitDialog doesn't work, overriding OnShowWindow doesn't work...) any ideas anyone? this has been bugging me for a while!

Thanks in advance,

Dave

Re: A (simple) dialogs question

ThatsAlok20-Dec-04 0:50

ThatsAlok

20-Dec-04 0:50

There is very good article Written by Mr Nishant S for your problem.

visit his Site http://www.voidnish.com for details

-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: A (simple) dialogs question

Dave Kerr20-Dec-04 2:28

Dave Kerr

20-Dec-04 2:28

Cheers, the solution on the site works great!

Dave Kerr
codechamber@hotmail.com
http://www.codechamber.com

Problems when converting from VC6++ to .Net

Samuel Ranta-Eskola19-Dec-04 22:50

Samuel Ranta-Eskola

19-Dec-04 22:50

I'm converting a multi project, multi threaded application from VC6 to .Net. After solving all the obvious problems due to the forgiveful VC6 compiler I stumbled across some harder problems.

First of all I got a ziljon of warnings (4251 and 4275). I chose to pragma ignore them. After that I got it all to compile and ran the application.

Then I got an Assertion Failed when the application greated the first CFrameWnd:

<br />
BOOL InterfaceThread::InitInstance()<br />
{<br />
  // Init event handles.<br />
	iThreadHasExited = NULL;<br />
<br />
  // Init dummy window<br />
  iDummyWindow=new DummyWindow();<br />
<br />
  iDummyWindow->Create(NULL,"InterfaceThreadDummy");<br />

iDummyWindow is a CFrameWnd and InterfaceThread inherits from CWinthread. This is the first function called from _AfxThreadEntry.

In CFrameWnd::CreateEx AfxGetInstanceHandle Fails Assertion.

After this a lot of assertion fails and finally I get an unrecoverable crash in AfxNewHandler. The error occurs here (in operator new):

<br />
#ifdef _AFXDLL<br />
		if (pfnNewHandler == _pfnUninitialized)<br />
		{<br />
			AFX_MODULE_THREAD_STATE* pState = AfxGetModuleThreadState();<br />
			pfnNewHandler = pState->m_pfnNewHandler;<br />
		}<br />
		if (pfnNewHandler == NULL || (*pfnNewHandler)(nSize) == 0)<br />
			break;<br />
#else<br />
		->>>>>>>>if (_afxNewHandler == NULL || (*_afxNewHandler)(nSize) == 0)<br />
			break;<br />
#endif<br />

Seems like _AFXDLL isn't defined even though it is defined in the preprocessor definitions.

Anybody got a hint???

Re: Problems when converting from VC6++ to .Net

Samuel Ranta-Eskola19-Dec-04 23:00

Samuel Ranta-Eskola

19-Dec-04 23:00

After a little debugging I just realized that new returned NULL. How can that be possible, now extraordinary amout of memory has been used and the size of the block alloced is just 400 bytes.

A new just before this had functioned perfectly.

Is there something that need to be done i .Net?

Re: Problems when converting from VC6++ to .Net

benjymous19-Dec-04 23:18

benjymous

19-Dec-04 23:18

Just a suggestion - have you tried reading through all the warnings you're getting, rather than just ignoring them? - You might be overlooking something really important

--
Help me! I'm turning into a grapefruit!
Phoenix Paint - back from DPaint's ashes!

Re: Problems when converting from VC6++ to .Net

Samuel Ranta-Eskola19-Dec-04 23:40

Samuel Ranta-Eskola

19-Dec-04 23:40

Of course I read through them. I also seached the web for similar problems, and most places indicated that you should ignore them.

The warnings were the following:

URLParameters.h(167) : warning C4251: 'URLParameters::iAttributes' : class 'CMapStringToString' needs to have dll-interface to be used by clients of class 'URLParameters'
c:\Program Files\Microsoft Visual Studio .NET\Vc7\atlmfc\include\afxcoll.h(1410) : see declaration of 'CMapStringToString'

BackgroundImage.h(26) : warning C4275: non dll-interface class 'CWnd' used as base for dll-interface class 'BackgroundImage'
c:\Program Files\Microsoft Visual Studio .NET\Vc7\atlmfc\include\afxwin.h(1913) : see declaration of 'CWnd'
BackgroundImage.h(25) : see declaration of 'BackgroundImage'

On top of this I've tried to find what's wrong with the memory handling.

I added a dummy loop that allocates an int in each iteration. If I put it in the top of InitInstance it can allocate int forever and ever, but if I move it down a bit (below a couple of window creations) it fails really quickly, after a 9 ints Frown | :(

We have now problem what so ever with memory when we're using VC 6, but now it crashes really early (not more than 14Mb of memory usage).

Recommendation of interpolation methods in visual C++

melachseng19-Dec-04 22:29

melachseng

19-Dec-04 22:29

I have a program in visual C++ which is used to plot rainfall rate graphs against time. Now i am looking for a suitable interpolation method that can improved my rainfall rate graphs especially near the maximum turning points.
Anyone out there that i can tap on his or her expertise????Thank youu
God bless;)

Re: Recommendation of interpolation methods in visual C++

Anonymous20-Dec-04 9:17

Anonymous

20-Dec-04 9:17

Try http://www.efunda.com/math/num_interpolation/num_interpolation.cfm[^] for a quick explanation of several interpolation methods. Google can also turn up some helpful references...

Help! about 2 threads share one com port

stans8019-Dec-04 22:12

stans80

19-Dec-04 22:12

Now i have one serial com port, and i want it been shared by 2 threads. Now i am using the binary semaphore to control it. I want to ask is it good? or is it good to use the critical section?

Can any body help me compare these method to let me see which one is better?

Thanks

Re: Help! about 2 threads share one com port

Blake Miller20-Dec-04 7:08

Blake Miller

20-Dec-04 7:08

Microsoft's own documentation makes the claim that the critical section is faster. Critical section can be used for synchronization among many threads within the same process. The critical section can not synchronize separate threads from different processes. It is difficult to make reader/writer type objects with critical sections.

Thread Termination

sudiptam19-Dec-04 21:17

sudiptam

19-Dec-04 21:17

Please if any of you can help me in these 2 cases :
Case 1:
I want to know something about Thread Termination . Generally I do it by exiting from the thread function by a return statement and posting a message to the main thread that the thread has ended . I have never used Terminate thread or Exit Thread API calls . But I have seen articles telling you call call Exit Thread from "Inside a thread" and not from "Outside a thread".Can you please explain me or put some of your thoughts in this matter ?

Case 2 :
Can you please send me a sample project which contains any program such as this :
There is a main thread which monitors two different Worker threads . Any sample application will do . So far I have done by creating a single thread within my the main thread .

Any help will be great . Thanks in Advance . Please mail me at aveek_99@yahoo.com .

Regards,
Aveek

Re: Thread Termination

David Crow20-Dec-04 6:18

David Crow

20-Dec-04 6:18

sudiptam wrote:
But I have seen articles telling you call call Exit Thread from "Inside a thread" and not from "Outside a thread".Can you please explain me or put some of your thoughts in this matter ?

See here.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Thread Termination

sudiptam19-Dec-04 21:17

sudiptam

19-Dec-04 21:17

Re: Thread Termination

stans8019-Dec-04 22:03

stans80

19-Dec-04 22:03

pls refer to the following url,
http://www.codeguru.com/Cpp/misc/misc/threadsprocesses/article.php/c3747/[^]
I think it is quite clear.

Suggestions Please

Neelesh K J Jain19-Dec-04 20:28

Neelesh K J Jain

19-Dec-04 20:28

Hello Friends,
I want to migrate from VC++6.0 to .Net, Please suggest me the correct path and what are the different technologies are present in it.
Thanks you in advance only.

Neelesh K J Jain.

Problem when Copying Text content to Clipboard

SivaramanDhamodharan19-Dec-04 19:33

SivaramanDhamodharan

19-Dec-04 19:33

, I'am copying some text content into the Clipboard. But I'm getting error at the SetClipboardData(CF_TEXT, h_glbl); function call. This is the code I'm using

CString str; <br />
HGLOBAL h_glbl;<br />
char * buff_data ;<br />
EmptyClipboard();<br />
m_ctrl_edit_cliptextdata.GetWindowText(str);<br />
if ( OpenClipboard() != 0 )<br />
{<br />
h_glbl = GlobalAlloc(GMEM_DDESHARE, str.GetLength() );<br />
buff_data = (char * ) GlobalLock(h_glbl);<br />
strcpy(buff_data, (LPCSTR) str) ;<br />
GlobalUnlock(h_glbl);<br />
SetClipboardData(CF_TEXT, h_glbl);<br />
CloseClipboard();<br />
}

Thanks in Advance. Smile | :)

Re: Problem when Copying Text content to Clipboard

Anonymous19-Dec-04 19:39

Anonymous

19-Dec-04 19:39

is this why if not what error type!

Text format. Each line ends with a carriage return/linefeed (CR-LF) combination. A null character signals the end of the data. Use this format for ANSI text.

to CF_TEXT

Re: Problem when Copying Text content to Clipboard

David Crow20-Dec-04 8:18

David Crow

20-Dec-04 8:18

SivaramanDhamodharan wrote:
But I'm getting error...

Would you mind telling us what this error is?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Problem when Copying Text content to Clipboard

SivaramanDhamodharan20-Dec-04 19:44

SivaramanDhamodharan

20-Dec-04 19:44

DavidCrow wrote:
Would you mind telling us what this error is?

This is error message i am getting :
"Unhandled Exception at 0x77f767 in Clipboard.exe : User breakpoint"

I am using vc++.net.

Also, I tried to copy the Error dialog and failed because it is opened state by this application.

Thanks ,
DavidCrow and annonymous Smile | :)

compile hangs

Anonymous19-Dec-04 19:28

Anonymous

19-Dec-04 19:28

compiler = vs.net2003 pro
anti software norton internet security 2005

i can not run forms.net but am able to compile com based apps.
i have disabled all antivirus and all others including scripts indicated
by severall help sites either internally or on net

the problem is still there can any one come up with a soloution besides un
installing NAV internet security 2005

email pgelliott@iprimus.com.au

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