C / C++ / MFC

11-Jun-12 22:06

Maximilien wrote:
to be able to use all of the new MFC (VS2008) expansion UI goodies (custom toolbars, application framework, ...)

New?

I am not sure if the compiler can tell you about resource ID conflicts, but if you check this note[^] it gives some good guidance.

Re: Resource ID conflicts with internal MFC.

Maximilien13-Jun-12 5:02

Maximilien

13-Jun-12 5:02

Richard MacCutchan wrote:
New?

New as in "MFC Feature Pack 2008" Sniff | :^)

(4 years!)

The compiler does not report ID conflicts, it all builds nicely.

Anyway, I will clean up my hundreds of resources in the offending range.

Watched code never compiles.

CapAVI callback – again - user defined parameter?

Vaclav_11-Jun-12 4:20

Vaclav_

11-Jun-12 4:20

This is a callback function definition used in capAVI frame callback.
The LPVIDEOHDR structure supplies useful data and one of the members ( dwUser) can be user defined. Is there a way to set this before the system executes this callback?
Could someone point me to a sample code which actually uses this member in any capAVI callbacks.

LRESULT CALLBACK capVideoStreamCallback(
HWND hWnd,
LPVIDEOHDR lpVHdr
);
typedef struct videohdr_tag {
LPBYTE    lpData;
DWORD     dwBufferLength;
DWORD     dwBytesUsed;
DWORD     dwTimeCaptured;
DWORD_PTR dwUser;
DWORD     dwFlags;
DWORD_PTR dwReserved[4];
} VIDEOHDR, *PVIDEOHDR, *LPVIDEOHDR;
Thanks for your help.
Vaclav

Re: CapAVI callback – again - user defined parameter?

C^hris L^osinger11-Jun-12 4:46

C^hris L^osinger

11-Jun-12 4:46

does capSetUserData do it ?

image processing toolkits | batch image processing

About Active Window And Receive Msg

yingkou11-Jun-12 3:53

yingkou

11-Jun-12 3:53

There is a MFC-Based Application，his window tree structure as below:
Root Parent Window
Sub-Parent Window1：Edit、ComboBox
Sub-Parent Window2：Edit、ComboBox、Static
Sub-Parent Window3：ListCtrl、Progress Bar
Sub-Parent Window4：Check Box
Child Window4-1：Edit、ComboBox
Child Window4-2：Edit、ComboBox
****
I want to know if user click any window(including controls) or Get Focus，which message can Root parent window receive.

Re: About Active Window And Receive Msg

Code-o-mat11-Jun-12 5:29

Code-o-mat

11-Jun-12 5:29

Try the NM_SETFOCUS[^] and NM_CLICK notification messages.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Re: About Active Window And Receive Msg

JohnCz13-Jun-12 13:10

JohnCz

13-Jun-12 13:10

Since you are using nonstandard nomenclature, please define Root Window, Sub window and Child window. What is relationship between all windows?

In general message about gaining focus (by any means including mouse click) is sent to a window that is gaining focus and loosing focus.
If this window is a child window, the parent does not know about what child gained focus.
You have two choices: write code in the child window to notify parent window about gaining focus using custom defined message, or write windows hook that will receive messages before any window does and post a message from the hook procedure to a parent window.

In both cases you would pass a handle to a window that gains focus.

JohnCz

Active Directory

Hadi Dayvary10-Jun-12 19:08

Hadi Dayvary

10-Jun-12 19:08

Hi Is it possible to read hardware information from another computer in a network with Active Directory and WMI?

www.logicsims.ir

What CWinThread is pointed to by AfxGetApp

ForNow10-Jun-12 7:51

10-Jun-12 7:51

The documentation says <b>A pointer to the single CWinApp object for the application</b>

However that is not really true is it CWinthread::m_pMainWnd

If whitin a CDialog I create a Thread and populate the data area with that (CWnd *) CDialog then AfxGetApp will return that window

Richard MacCutchan10-Jun-12 7:55

10-Jun-12 7:55

ForNow wrote:
The documentation says

Which documentation; please provide links?

ForNow wrote:
However that is not really true is it CWinthread::m_pMainWnd

Again, no idea what you are looking at, but the actual documentation is here[^].

ForNow10-Jun-12 9:02

10-Jun-12 9:02

<a href="http://msdn.microsoft.com/en-us/library/5k9f064x(v=vs.80).aspx">http://msdn.microsoft.com/en-us/library/5k9f064x(v=vs.80).aspx</a>[<a href="http://msdn.microsoft.com/en-us/library/5k9f064x(v=vs.80).aspx" target="_blank" title="New Window">^</a>]

ForNow10-Jun-12 9:08

10-Jun-12 9:08

For some reason my pre tags aren't working sorry for thr giberich

I just googled AfXGetApp and the doc say the Thread pointed to My CWinApp

Richard MacCutchan10-Jun-12 22:01

10-Jun-12 22:01

Exactly so, but I still don't know what your question is. Aside from the fact that you still seem to be having trouble understanding the Windows model, the use of threads and MFC.

Erudite_Eric10-Jun-12 9:15

Erudite_Eric

10-Jun-12 9:15

How many more days do you want to spend trying to bend windows to do what you want?

Rather than try to make a worker thread a UI thread in order to get a message handler in it just add your own messaging. It is easy:

C++

MyThread()
{
WaitForEvent();
WhileNotMessageQueueEmpty()
{
ReadMessageOffQueue();
ProcessMessage();

}

}

somewhere in your code.....

C++

PutMessageOnQueue();
SignalQueueEvent();

and at shut down....

C++

SignalQueueEvent();

And domnt forget your queue needs to be protected with a lock so it it thread safe.

==============================

Nothing to say.

ForNow10-Jun-12 18:26

10-Jun-12 18:26

I am Using a UI thread

Erudite_Eric11-Jun-12 0:58

Erudite_Eric

11-Jun-12 0:58

Because you want to use windows messaging.

OK, keep struggling, keep wasting time, it is your choice. Smile | :)

==============================

Nothing to say.

Callback (capAVI) and MFC doc/view

Aescleal10-Jun-12 13:11

Aescleal

10-Jun-12 13:11

There is only 1 object of a class derived from CWinApp in an MFC application. Any program with more than one object of a CWinApp derived class won't even compile. As CWinApp is derived from CWinThread that means the app object is a thread as well.

AfxGetApp (as generated by the code generator) always returns that one object. Always, no exceptions.

Now... Windows has two types of threads. We've been over that in other questions. If you want to use them in MFC you do one of the following:

- Worker threads are kicked off by AfxBeginThread. Call that with a pointer to the function you want it execute, it gives you a CWinThread, and off you go, woo hoo! CAVEAT if you call a USER function in your worker thread it gets a message queue BUT you won't be able to do anything with it as MFC doesn't know that it's changed. It's still just scheduling that single function (which could include a message loop but please don't try it...).

- UI threads are slightly harder - you have to derive your own class from CWinThread. Override InitInstance to create the window for your UI thread. Don't try and be clever and use an existing window - if you do messages for that window will be processed by whatever thread created the window, not what you want. Then call AfxBeginThread passing it a pointer to your derived class's RUNTIME_CLASS. You can't just assign an arbitary window pointer to m_pMainWnd and expect it to work - it won't.

Vaclav_10-Jun-12 6:17

Vaclav_

10-Jun-12 6:17

I need some hint how to do this.
Most capAVI examples of callback let the callback function process the data.
I have static splitter with four views of the document and one of them does the callback stuff – semi real time video capture.
I need to “send” the video data from the callback function to the document so I can do processing and updating of the remaining views accordingly.

I though that I could just instantiate another view, but it would have to be in the initial templates to have access to the document. Little kludgy, but doable.
Ideally I would like to let view which runs the callback to send the data to the document, but I do not know how to do it.
I also do not have a clue how to access the callback return value.
Maybe that would work if I can return the data.
I am pretty much stuck.
Any help would be as always appreciated.
Thanks Vaclav

PS This is plain MFC doc/view in VC++ 6.0 ancient stuff, peppered with OpenCV and capAVI.

Addendum
I found this here and I think it will get me started
Callbacks, Threads, and MFC

-- modified 10-Jun-12 12:38pm.

Example of CONSTRUCTOR and DESTRUCTOR in derived class ? ? ?

likescr79-Jun-12 19:41

likescr7

9-Jun-12 19:41

hey guys....i need you all to help me to get an example of CONSTRUCTOR and DESTRUCTOR in derived class....and before helping me make sure your answer is correct and can help me,...Thanks Wink | ;)

SuNiL

Re: Example of CONSTRUCTOR and DESTRUCTOR in derived class ? ? ?

Richard MacCutchan9-Jun-12 22:17

9-Jun-12 22:17

likescr7 wrote:
make sure your answer is correct

Well, just in case I'm not up to the job, you could always read the documentation[^].