C / C++ / MFC Discussion Boards

Hans Dietrich1-Jan-09 13:46

1-Jan-09 13:46

Does anyone have a sample program (+ source code) that uses the Vista magnification APIs? Or a link to such a sample program? I'm looking for a working sample program, not the docs for the API.

Best wishes,
Hans

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Emergence! 0xC0000005: Access Violation again [modified]

whiteclouds1-Jan-09 12:57

whiteclouds

1-Jan-09 12:57

Hi, thomas!
Thanks for your reply.
I think I had found the reason. After I delete some variables that aren't be used any more, the exception is missing. But another exception is occur same as this when I use the code following:

time_t  ltime;      // local time
struct tm *gmt; // Greenwich Mean Time
png_time ttime; // png format
time (&ltime);  // get the local time---EXCEPTION 0xC0000005 OCCUR HERE!
gmt = gmtime (&ltime);  // convert to gmt
png_convert_from_struct_tm (&ttime, gmt);  // convert to png format
        png_set_tIME (png_ptr, info_ptr, &ttime);

I trace this exception into MFC and I found when a function named _mlock was invoked in the __tzset function, the exception occur. The related code like this:

_mlock( _TIME_LOCK );

I don't know the reason and hope you or others can give me some suggestion. Thank you!
By the way: if the title of this message offend someone, I'm very sorry because this event is an emergency really. Mad | :mad:

Regards!

whiteclouds

modified on Thursday, January 1, 2009 8:20 PM

Re: Emergence! 0xC0000005: Access Violation again

Luc Pattyn1-Jan-09 13:11

Luc Pattyn

1-Jan-09 13:11

Hi,

0xC0000005 is an access or privilege violation, which means you can't access something;
quite often it indicates an invalid pointer, such as NULL. It could also mean you don't
have the required privileges to do something.

suggestion: look at your source code, and all the variables that appear in the line that fails.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

Re: Emergence! 0xC0000005: Access Violation again

whiteclouds1-Jan-09 14:20

whiteclouds

1-Jan-09 14:20

Hi
I can't get your meaning. I check my code again. The address of the variable ltime is valid. All things looks like in order. But the error always occur. Frown | :(

Help!

Regards!

whiteclouds

Re: Emergence! 0xC0000005: Access Violation again

Luc Pattyn1-Jan-09 14:48

Luc Pattyn

1-Jan-09 14:48

Maybe this is relevant[^]?

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

Re: Emergence! 0xC0000005: Access Violation again

whiteclouds3-Jan-09 14:54

whiteclouds

3-Jan-09 14:54

I think I had resolved this problem. My solution is to instead the time_t with SYSTEMTIME structure. Then everything looks right. Otherwise I don't know the detail of it. I think maybe this structure was obsoleted. Smile | :)

Re: Emergence! 0xC0000005: Access Violation again

Luc Pattyn3-Jan-09 15:50

Luc Pattyn

3-Jan-09 15:50

Glad you got it working.
Thanks for sharing this.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Love, happiness and fewer bugs for 2009!

Menu Items

BobInNJ1-Jan-09 11:09

BobInNJ

1-Jan-09 11:09

I am developing an application using C++ and MFC. Please consider the following code from a Windows RC (Resource Script) file:

<br />
<br />
IDR_MAINFRAME MENU<br />
BEGIN<br />
    POPUP "&File" {<br />
        MENUITEM "&New",                CALC_FILE_NEW<br />
        MENUITEM "Calculate"            CALCULATE<br />
        MENUITEM "Abort Calculation"    ABORT_CALCULATION,GRAYED<br />
        MENUITEM "&Exit",               CALC_FILE_EXIT<br />
    }<br />
    .<br />
    .<br />
    .<br />

I would expect the third menu selection to be grayed out. That is, the user should not be able to select it. However, this is not what happens. I would like to know why?

Thanks

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 11:27

Richard Andrew x64

1-Jan-09 11:27

I think you also have to specify that it's disabled as well.

Re: Menu Items

BobInNJ1-Jan-09 12:31

BobInNJ

1-Jan-09 12:31

Richard,

Thanks for the response. However, I do not think DISABLED is a valid option for creating the menu item. When I tried it, it would not going through the resource compiler. The line I tried
was:

<br />
        MENUITEM "Abort Calculation"    ABORT_CALCULATION,GRAYED,DISABLED<br />

Was that what you meant?

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 12:35

Richard Andrew x64

1-Jan-09 12:35

You're right. I checked the docs, and the word I was thinking of is "INACTIVE", not "disabled".

However, it says that GRAYED should do what you are looking for.

Can you say what behavior you are observing when you use just GRAYED?

Re: Menu Items

BobInNJ1-Jan-09 12:40

BobInNJ

1-Jan-09 12:40

Richard,

What I would like is the menu option to be set in such a way that the user cannot select it. In addition, when the menu is displayed, it should be displayed in such a way that it looks disabled to the user.

Thanks

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 12:39

Richard Andrew x64

1-Jan-09 12:39

I see that you are missing commas in a couple of locations in your MENUITEM list.

Perhaps that is the cause of the malfunction?

You're missing commas on the Calculate and Abort Calculation menu items.

Re: Menu Items

BobInNJ1-Jan-09 12:56

BobInNJ

1-Jan-09 12:56

Richard,

Thanks for the response. I tried adding those missing commas as you suggested but it did not solve my problem.

Bob

Amcap C++ source code!

Hadi Dayvary1-Jan-09 9:40

Hadi Dayvary

1-Jan-09 9:40

Hi I need Amcap c++ source code(Active Movie Capture c++ sample), but I can not not find it in visual studio folder or in internet!
please give a link to it's source code,
thanks

www.logicsims.ir

Re: Amcap C++ source code!

Jijo.Raj1-Jan-09 10:19

Jijo.Raj

1-Jan-09 10:19

Amcap is a DirectShow Sample[^]. You have to install Windows SDK[^] for it. Well, check this[^] link too, which will be helpful to you.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Amcap C++ source code!

Hadi Dayvary1-Jan-09 20:57

Hadi Dayvary

1-Jan-09 20:57

Thank you
But I can't download Windows SDK, it's too big, I just wanna Amcap source code, I know it's DirectShow sample, and I've seen that 'How to compile AMCap' page,

www.logicsims.ir

"C++" Base64 De/En coding Class

Joseph Marzbani1-Jan-09 8:36

Joseph Marzbani

1-Jan-09 8:36

Would you direct me to an address to download a "C++" Base64 De/En coding Class for free please?

Thank you masters!

Re: "C++" Base64 De/En coding Class

Mark Salsbery1-Jan-09 8:46

Mark Salsbery

1-Jan-09 8:46

I don't have a specific link to a download, but
there's lots of sample code here[^] Smile | :)

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

Re: "C++" Base64 De/En coding Class

Dark_eye1-Jan-09 9:37

Dark_eye

1-Jan-09 9:37

A very good one, in STL:
http://www.adp-gmbh.ch/cpp/common/base64.html[^]

Re: "C++" Base64 De/En coding Class

bob169721-Jan-09 11:49

bob16972

1-Jan-09 11:49

Why not just implement the frackin thing. It is probably one of the simpler encoding schemes to implement and is about one page of code for the encoder method and one page for the decoder method.

IMO, a C/C++ programmer should have implemented the algorithm at least once in their career. Libraries are nice but implementing this one helps keep the rust out and gives you a tad more independence.

All the necessary information and links to the RFC's and sample source code are here[^]

UnClickable window... Clicks thru

yytg1-Jan-09 3:35

yytg

1-Jan-09 3:35

How do you create a window so when someone clicks on it the click event go to the window under it? (not the parent)

thanks in advance

Re: UnClickable window... Clicks thru

Christopher W. Smith1-Jan-09 9:58

Christopher W. Smith

1-Jan-09 9:58

What do you mean by "the window under it"? Do you mean in the z-order, or perhaps the window that created the current window??? "the window under it" could be any window.

Whichever window you mean, it's pretty easy to notify another window of an event in the current window.

First add a WM_LBUTTONDOWN handler to both windows. (http://msdn.microsoft.com/en-us/library/ms645607(VS.85).aspx[^])

in the window class header files under DECLARE_MESSAGE_MAP()

afx_msg void OnLButtonDown(UINT nFlags, CPoint point);

in the window class source file for the window being clicked:

...
//pass the message on to another window...
void CMyWnd::OnLButtonDown(UINT nFlags, CPoint point)
{
    m_NotifyWnd.SendMessage(WM_LBUTTONDOWN);
}
...
//under BEGIN_MESSAGE_MAP
    ON_WM_LBUTTONDOWN()
...

where m_NotifyWnd is whatever window you want to notify of the click.

Also remember to add the message map for the window receiving the notification.

I did not preserve wparam and lparam across the SendMessage call, you will probably want to read up on the message (link above) and finish the code with the wparam and lparam arguments.

Insofar as finding the correct window to notify, I direct you to the following CWnd member functions to check out (since I'm not quite sure what you're looking for):

CWnd::GetParent[^]

CWnd::GetOwner[^]

CWnd::GetParentOwner[^]

Additionally you can create a member of your class to store a pointer or reference to some other window to notify.

Hope that helps Smile | :)

Chris Smith

Re: UnClickable window... Clicks thru

aks.1-Jan-09 17:55

aks.

1-Jan-09 17:55

Create a layared window. For more pls check SetLayeredWindowAttributes() in MSDN for how to create a layared window.
Then set the Transparent property( WS_EX_TRANSPARENT ) for the dialog.

Now the messages to the layared wnidow will be transferred to the window underlying it.

aks

Re: UnClickable window... Clicks thru

yytg1-Jan-09 20:15

yytg

1-Jan-09 20:15

Thanks

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