Re: exception error occurs in Navigate2 function - C / C++ / MFC Discussion Boards

Re: How to get application idle state for Pocket PC 2003

Ali Rafiee21-Feb-08 9:32

Ali Rafiee

21-Feb-08 9:32

Doesn't the CWinApp::OnIdle get called?

AliR.

AliR.
Visual C++ MVP

How to disable lockup screen key(VK_LWIN+L or VK_RWIN+L)?

zhouhh19-Feb-08 21:31

zhouhh

19-Feb-08 21:31

I have tryed to use Windows Hook, but failure.

Re: How to disable lockup screen key(VK_LWIN+L or VK_RWIN+L)?

James R. Twine20-Feb-08 7:28

James R. Twine

20-Feb-08 7:28

   You might not be able to. I am fairly sure that the SAS (Secure Attention Sequence, or <CTRL+ALT+DELETE>) cannot be intercepted, and this is by design. (Edit: This is without getting into the nitty-gritty of implementing a GINA DLL...)

   The same might apply to the Lock Workstation hotkey/accelerator.

   Besides, the user could still do <CTRL+ALT+DELETE> and then hit <K> or click [Lock Workstation], so even if you intercepted <WinKey+L> the user could still lock the workstation.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

output status - update window

Paulraj G19-Feb-08 21:03

Paulraj G

19-Feb-08 21:03

hi...

my program is running via service.

if shutdown or restart my system, my program will start to run automaticaly.

now the problem is it is running newly.

it didn't take previous status.

like

first time

"server listening.
client1 connected.
client2 connected.
client3 connected.
client1 disconnected.
client2 disconnected.
client3 disconnected.
server disconnected."

this is my previous output.

if i restart this will start from
""server listening."

i need to update previous status.

what is the procedure?

can anyone help me?

thanks

paulraj

Re: output status - update window

Mark Salsbery20-Feb-08 6:00

Mark Salsbery

20-Feb-08 6:00

I don't understand the problem.

As with any data that needs to persist between executions of a program, you
need to persist that data somewhere. Saving to a file usually works well.

Mark

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

How to run vbscript from C++ code?

sandeepkavade19-Feb-08 20:22

sandeepkavade

19-Feb-08 20:22

Hi all,
How to vb script from a C++ code.

the script is like:

Function execute()
.
.
.
.
.
.
.
execute = obj.xml 'obj.xml is a xml
End Function

the script is working fine if i write it in a vbs file and double click on it.
but how to call it from a C++ code.

I tried with IScriptControl::Run but the its not giving any output.

SAFEARRAYBOUND rgsabound[] = { 0, 0 }; // 0 elements, 0-based
USES_CONVERSION;

psa = SafeArrayCreate(VT_VARIANT, 1, rgsabound);
if (!psa)
{
return E_OUTOFMEMORY;
}

_variant_t outpar = m_pScriptControl->(m_bstrFunction, &psa); // m_bstrFunction = execute

but after execution of this statement outpar is empty.

exception error occurs in Navigate2 function

nitin_pro19-Feb-08 19:10

nitin_pro

19-Feb-08 19:10

Hello All
I have an application in which i use a navigate2 function but when i make a DLL , there is an exception in navigate2 function kindly look into the matter
Thanks

Re: exception error occurs in Navigate2 function

_AnsHUMAN_ 19-Feb-08 19:48

_AnsHUMAN_

19-Feb-08 19:48

Are you sure that the exception is occurring within the Navigate2 function. Did you check for the parameters that you pass to the function.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: exception error occurs in Navigate2 function

nitin_pro19-Feb-08 22:33

nitin_pro

19-Feb-08 22:33

there are two programs one is exe ane another one is Dll in EXE there is no error and in Dll we face a exception error
i 'll pass the path of the file in Navigate2 like this

memset(szFolderPath, 0x00, MAX_PATH);
SHGetSpecialFolderLocation(NULL,CSIDL_RECENT, &pidl);
BOOL f = SHGetPathFromIDList(pidl,szFolderPath);

csTempPath.Format(_T("%s"),szFolderPath);

INT nTempIndex =csTempPath.Find(_T("Recent"));
csTempPath =csTempPath.Mid(0,nTempIndex);
csTempPath =csTempPath + _T("Local Settings\\Temp\\Sample") + csExt;

hDevice = CreateFile(csTempPath, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
NULL, CREATE_ALWAYS,0,NULL);

if(hDevice)
{
pView->Navigate2(csTempPath);
pView->EnableWindow(FALSE);
pView->ShowWindow(SW_NORMAL);
}

the same code successfully runs in an exe but when i make a dll ithe navigate function gives the error . when i debug the code error shows in this Class C:\....MFC\SRC\VIEWHTML.CPP
just have a look the code where excatly the error promts i'll mark the arrow

void CHtmlView::Navigate2(LPCTSTR lpszURL, DWORD dwFlags /* = 0 */,
LPCTSTR lpszTargetFrameName /* = NULL */,
LPCTSTR lpszHeaders /* = NULL */,
LPVOID lpvPostData /* = NULL */, DWORD dwPostDataLen /* = 0 */)
{
ASSERT(m_pBrowserApp != NULL);

COleSafeArray vPostData;
if (lpvPostData != NULL)
{
if (dwPostDataLen == 0)
dwPostDataLen = lstrlen((LPCTSTR) lpvPostData);

vPostData.CreateOneDim(VT_UI1, dwPostDataLen, lpvPostData);
}

COleVariant vURL(lpszURL, VT_BSTR);
COleVariant vHeaders(lpszHeaders, VT_BSTR);
COleVariant vTargetFrameName(lpszTargetFrameName, VT_BSTR);
COleVariant vFlags((long) dwFlags, VT_I4);

===>>> m_pBrowserApp->Navigate(vURL,
vFlags, vTargetFrameName, vPostData, vHeaders);
}

kindly solve the issue
thanks

C++ code migration to Linux

Member 386968219-Feb-08 19:02

Member 3869682

19-Feb-08 19:02

Hi all,
i m developing a dll on visualC++ 2005 which needs to be made poratable to linux as well. I implemented the expected functionality in windows. Now i m looking whether any POSIX api's available which would work similarly on both windows as well as linux.As such i used standard C++ api's at the max but still there are few api's like createprocess() on windows doesn't seems to work on linux but i found out equivalent linux api's(fork() and execv()).
1)Is there any POSIX api which work on both Linux and windows and creates a child process how createprocess() does on windows and fork(),execv() combination does on Linux..?
2)Is there any POSIX api which would get list of files and subfolder names for a given folder name..?( i could not even find out a separate api on windows or linux which does this listing of files/subfolders.!!!)

Thanks in advance
kathir

Re: C++ code migration to Linux

Nemanja Trifunovic20-Feb-08 5:59

Nemanja Trifunovic

20-Feb-08 5:59

1) Pretty much no.
2) For POSIX, look at dirent.h. Even better, there is (soon to be a part of the Standard) Boost Filesystem library that is portable.

Programming Blog

utf8-cpp

DirectShow

Chandrasekharan P19-Feb-08 18:18

Chandrasekharan P

19-Feb-08 18:18

I insalled DirectX10 SDK. but i dint see anything to work on video. now where can i download DirectShow? is there any sites where i can download?

Re: DirectShow

Rajkumar R19-Feb-08 18:20

Rajkumar R

19-Feb-08 18:20

DirectShow SDK is now not part of new DirectX SDK, u may find it in DirectX 9 SDK, it is now moved to platform SDK.
see this DirectShow 9.0[^]

Re: DirectShow

Chandrasekharan P19-Feb-08 18:27

Chandrasekharan P

19-Feb-08 18:27

so what needs to be done with the DirectX 10 that i have installed?? it say that To get the latest DirectShow SDK, download the latest version of the Windows SDK.

when i try to search with Windows SDK i am not getting the right downloadable.

Re: DirectShow

Rajkumar R19-Feb-08 18:38

Rajkumar R

19-Feb-08 18:38

search for platform SDK, may be this useful PSDK[^]

Chandrasekharanp wrote:
so what needs to be done with the DirectX 10 that i have installed?

Direct Show requires DirectX Runtime only, DXSDK is not required if u have DSHOW SDK. if u bother about disk space u can remove DXSDK.

gaussion function in c++ [modified]

gentleguy19-Feb-08 16:15

gentleguy

19-Feb-08 16:15

dear all

how to use Gaussion function to generate different image according to different k value? and also how to multiply with another image value f(x)? anyone has such code and let me make a refference. thanks a lot.

how the gaussion function convolute another one function, this is my first time to do this, so difficult, anyone give me suggestion and who can provide such code is better, thanks

Li Zhiyuan

modified on Tuesday, February 19, 2008 11:22 PM

Re: gaussion function in c++

CPallini19-Feb-08 22:54

CPallini

19-Feb-08 22:54

li zhiyuan wrote:
how to use Gaussion function to generate different image according to different k value?

AFAIK the Gaussian is a function depending on a variable, say x, and two parameters, say Xmean and Sigma.
I don't see any k in the above definition hence, I cannot understand your requirements. Maybe you have to further detail your problem.
Regarding the image generation: What kind of image do you need to generate?
What is image definition? Is it a curve depending on Gaussian values?

I think you'll need to explain more more clearly your problem.
Smile | :)

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: gaussion function in c++ [modified]

gentleguy20-Feb-08 0:31

gentleguy

20-Feb-08 0:31

thanks, my problem is how to blur a image, it is a 2D digital image. like f(x,y).

by the way
A[(-1,-1),(0,-1),(1,-1);(-1,0),(0,0),(1,0);(-1,1),(0,1),(1,1)]
how to denote this array by for loop in my code? thanks

Li Zhiyuan

modified on Wednesday, February 20, 2008 7:17 AM

Re: gaussion function in c++

CPallini20-Feb-08 4:26

CPallini

20-Feb-08 4:26

li zhiyuan wrote:
thanks, my problem is how to blur a image, it is a 2D digital image. like f(x,y).

Typing blur in CP search engine make magical things happen [^].

li zhiyuan wrote:
by the way
A[(-1,-1),(0,-1),(1,-1);(-1,0),(0,0),(1,0);(-1,1),(0,1),(1,1)]

Do you mean

int A[][3][2]={{{-1,-1},{0,-1},{1,-1}},{{-1,0},{0,0},{1,0}},{{-1,1},{0,1},{1,1}}};

UI Thread question (noob)

Maximilien19-Feb-08 13:47

Maximilien

19-Feb-08 13:47

I take full responsability on my "noobness" concerning threads.

I have been reading a lot of Newcomer's comments and tips (http://www.flounder.com[^]) and a lot of other places, books, and I still got a few question.

If I create a UI thread like this (in a simple dialog based application (in the OnInitDialog) ) :

// m_pMyThread is derived from CWinThread.
m_pMyThread = new MyThread(this);
m_pMyThread->CreateThread(CREATE_SUSPENDED);
m_pMyThread->m_bAutoDelete = false;
m_pMyThread->ResumeThread();

And in my thread class, OnPlay and OnStop and thread messages called from my UI (with registered messages), the PostMessageW in the loop is to update a CStatic in the dialog:

	ON_REGISTERED_THREAD_MESSAGE(WM_PLAY_THREAD_MESSAGE, OnPlay)
	ON_REGISTERED_THREAD_MESSAGE(WM_STOP_THREAD_MESSAGE, OnStop)

void MyThread::OnPlay(WPARAM wParam, LPARAM lparam)
{
	m_bRunning = true;
	int i = 0;
	while( m_bRunning)
	{
		m_pParent->PostMessageW( WM_THREAD_PLAYING_MESSAGE, (WPARAM) i, 0 );
		Sleep(500);
		i++;
	}
	TRACE("MyThread::OnPlay\n");
}

void MyThread::OnStop(WPARAM wParam, LPARAM lparam)
{
	TRACE("MyThread::OnStop\n");
	m_bRunning = false;
}

This (above) obviously does not work since the loop in OnPlay is "blocking" the thread messaging. If I do not loop in OnPlay, the OnStop message is handled properly.

I also tried this, and it does not work either:

m_pMyThread->PostThreadMessage(WM_QUIT, 0, 0);

So, What is the way to to stop the loop from my UI ? I tried adding a PeekMessage/TranslateMessage/DispatchMessage check in my loop to see if it would catch the message.
I cannot send a message to the thread.

Is modifying the m_bRunning with a direct call the preferred way ? like :

m_pMyThread->m_bRunning = false;

Thanks for any info tips and hints.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: UI Thread question (noob)

Mark Salsbery19-Feb-08 14:45

Mark Salsbery

19-Feb-08 14:45

Maximilien wrote:
Is modifying the m_bRunning with a direct call the preferred way ?

In this case, yes. To make the interface cleaner (instead of the inconsistent
post a message to start, set a variable to stop) you could add two public methods
to your thread class - Play() and Stop(). In Play(), post your WM_PLAY_THREAD_MESSAGE,
and in Stop(), you can set your running flag. That makes the thread control interface nice
and clean to the outside world.

Just my 2 cents - IMO, beyond the learning experience, the implementation is overkill...
a simple timer at 500ms intervals would make a much cleaner solution, without the need
for the secondary thread. Periodic timers are made for what you're doing there Smile | :)

Mark

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

Re: UI Thread question (noob)

Maximilien19-Feb-08 15:11

Maximilien

19-Feb-08 15:11

Thanks Mark.

Using a thread in our application will probably be overkill and not necessary, but I'm using the opportunity to learn a little bit on the side; Thread is one of the things I never really coded (was done by other people before).

BTW, the Sleep will not be in the final code! I will replace that with real functional code.

Still learning.

Maximilien Lincourt
Your Head A Splode - Strong Bad

How to start ? built app to communication through USB port

quangpk19-Feb-08 13:12

quangpk

19-Feb-08 13:12

Hi,
- I use VC++ 6.0 in Win2k. I want built app to communication through USB port. How to start ?
Quang,

Re: How to start ? built app to communication through USB port

Maxwell Chen19-Feb-08 15:57

Maxwell Chen

19-Feb-08 15:57

USB FAQ[^]

Maxwell Chen

Any buttons styles to get a CButton to look like a toolbar button?

jeffb4219-Feb-08 11:19

jeffb42

19-Feb-08 11:19

I have a CDialogBar which has a few CButton objects in it. Each CButton object contains an icon (no text) and I'd like them to appear like the buttons in a CToolBar do (flat, not raised, until the mouse hovers over the button). I used Spy++ to look at the button styles of the buttons in the tool bar, but only the tool bar has a hwnd - none of the buttons do, so it looks like the tool bar might be owner-drawing the buttons itself.

Is there a known set of button styles/window styles that one can set a CButton to and get it to appear like a button within a CToolBar does?

I can always look and see if someone has built an owner drawn CButton class which emulates a CToolBar button, but if this functionality is already built into the system then I'd rather use what's already here.

Thanks,

Jeff

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