Re: C++ -> Camera project, (mjpeg, jpeg to avi ... ?) - C / C++ / MFC Discussion Boards

sweep1233-May-04 23:10

3-May-04 23:10

I am trying to have an MFC application that shares data with a DLL.
The DLL is loaded via a batch file in a C-Scripting environment.

I have included the following lines of code in both the EXE and DLL

#pragma data_seg(".CSL_DATA")

int volatile abortFlag = 0; /* The flag to abort the test */
int volatile contiuneFlag = 1; /* The flag to schedule the test to continue */
int volatile enterFlag = 0; /* The flag to schedule data entry the test */

#pragma data_seg()
#pragma comment(linker, "/SECTION:.CSL_DATA,RWS")

On the C-Scripting side of things the batch file loads the DLL as follows:-

#loadlibrary 'WHLLIB'

However any changes in the data (abortFlag say) is not reflected in the other side.

Basically all I want is the 3 variables to be visible by the libray and the application.

Am I doing it wrong?!?

Displaying dynamic XML in IE which is translated by xslt

chabster3-May-04 0:32

chabster

3-May-04 0:32

I need to display XML in IE Com control. This XML is translated by xslt (some external file, presented by end-user), and after i change source xml i want IE somehow to synchronize it's representation...

about directsound / getting instantaneous frequency of the sound playing

dipum2-May-04 22:51

dipum

2-May-04 22:51

hi,

please help me in any way you can which will be highly appreciated.

i'm a computer engineering student and i'm doing a 3 months project on computer controlled musical water fountain. we have to create an audio player and capture the instantaneous frequency of the song playing from its buffer, calculate the dominating frequency for brief interval of time and send it to the electrical team who will receive the signal and activate the corresponding motors for the different pattern of the water fountain.

I used Java's JMF(java media framework) API but it could only give the samples per second. but what i actually need is the sample values.i also studied the DirectX.DirectSound 's getFrequency() method but it could only give the samples per second.

Eagerly hoping for positive response.

Re: about directsound / getting instantaneous frequency of the sound playing

Anonymous31-May-04 21:36

Anonymous

31-May-04 21:36

tre 46 654 5465 6547 54 ı ayman Laugh | :laugh:

C++ -> Camera project, (mjpeg, jpeg to avi ... ?)

Qualvis2-May-04 22:23

Qualvis

2-May-04 22:23

Hello, I am a student working on a camera surveillance project and I am trying to write an
application that will be able to use any camera regardless of its vendor.

I have an axis PTZ 2130 camera to work with, and I have the ActiveX control for this camera that displays the MJPEGs being pushed from the camera.

If I want to periodically grab one of those JPEG being pushed from the
camera what would be the best way to do it. I know I want to use DirectShow.
But I'm not quite sure how to go about doing it.

Any help would be much appreciated, thanks.

Re: C++ -> Camera project, (mjpeg, jpeg to avi ... ?)

Andrew Walker3-May-04 0:14

Andrew Walker

3-May-04 0:14

Download and install the DirectX SDK.

Take a look at the PlayCap sample application which installed to C:/DXSDK/Sample/C++/DirectShow/Capture/Playcap for a default installation. It describes how to get a capture graph up and going. Modify the graph to include a ?sample?grabber filter (the name depends on the version of the SDK). Modify the application to grab and parse jpegs.

There is a fair bit of work involved in doing this, but enough people on Codeproject know how to use DirectShow so you should get plenty of help

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Re: C++ -> Camera project, (mjpeg, jpeg to avi ... ?)

Qualvis3-May-04 1:39

Qualvis

3-May-04 1:39

Well, I've been working for a few weeks with directshow, and working whith the capture graph isn't really a problem anymore.

its the parsing of these Jpegs that troubles me. I Have no idea how to make a stream out of these and using them with in Directshow.
I use Wininet to download one jpeg and save it to a file at a time, and I can show this with using RenderFile(c:\\"example.jpg") or something. I just don't know how to stream these jpegs. (the camera has a webserver where a jpeg image is refreshed constantly).

thanks for the reply btw

Re: C++ -> Camera project, (mjpeg, jpeg to avi ... ?)

Andrew Walker3-May-04 1:46

Andrew Walker

3-May-04 1:46

I'm speculating - your application doesn't seem to be as similar to what I was using DirectShow for as I first thought. Have you looked at the PushSource Filter? It pushes bitmaps from files, but I'm sure it could be modified to either push jpegs or to convert jpegs in bitmaps and then push them into a graph.

Re: C++ -> Camera project, (mjpeg, jpeg to avi ... ?)

Qualvis3-May-04 3:28

Qualvis

3-May-04 3:28

I think I'll try working with this filter, I'll let you know if i accomplish something

Invalidate() - Erasing background

AJ1232-May-04 22:11

AJ123

2-May-04 22:11

Hi,

I am using a CView to display a GDI+ image. My problem is when I change the image displayed i want to erase the background first. Invalidate(true) appears to have no effect, does anyone know why this is the case? Any clues at all would be appreciated!

Cheers
Rich

Re: Invalidate() - Erasing background

AJ1232-May-04 23:38

AJ123

2-May-04 23:38

doh!, please ignore this my logic was a bit screwed up. Wasn't clearing one of my GDI+ Graphics objects.

How to make a .lib ?

Anonymous2-May-04 21:12

Anonymous

2-May-04 21:12

How create a .lib from a .cpp & its .h ?

And that's in order to use some functions which are defined in.

Re: How to make a .lib ?

nguyenvhn2-May-04 23:17

nguyenvhn

2-May-04 23:17

if you are using Visual Studio, just try something bellow:

1. Select File -> New -> Projects -> Win32 Static Library
2. Specify Project Name and Location
3. Add all your files into project with command: Project -> Add to project -> Files
4. Make any setting that you need and build

In order to re-use library function:

1. Include headers which declare functions into file where you plan to use that functions
2. In project setting, at Link tab -> Object/ Library modules, type the path points to your lib file
3. Build

There is an easier way to re-use library function from lib file if you add that library project to your current project and set the dependency between them correctly (Project -> Dependencies)

Have fun.

Re: How to make a .lib ?

Anonymous3-May-04 2:16

Anonymous

3-May-04 2:16

Thank's it works well Smile | :)

And very easy to run...

Problems with Mfc-Program: black screen

Brennivin2-May-04 21:04

Brennivin

2-May-04 21:04

Hi everybdoy!
I developed a program under Mfc and VisualC++, SP5. After installing the program and all the components (i. e. controls) under Win98 (not SE), I get a black screen. When I click around and hit a control, it appears back, the rest stays black.
Under Win2000 it works fine without any problems.

Now I need your help:
Where could the problem be located?
How can I resolve this problem?

Thank you very much for your help
Brennivin

Re: Problems with Mfc-Program: black screen

Alexander ^M.,3-May-04 1:54

Alexander ^M.,

3-May-04 1:54

what do you mean by black screen? does the program or the os not react anymore?

Don't try it, just do it! Wink | ;-)

Re: Problems with Mfc-Program: black screen

Brennivin4-May-04 7:47

Brennivin

4-May-04 7:47

No, there is just no picture! If you finish the program, it appears back and you can work on without any problems. And if you click left on a control, you see just this control, the rest is black.

Greets
Brennivin

CreateRemoteThread for Win98

Kuldeep Bhatnagar2-May-04 20:47

Kuldeep Bhatnagar

2-May-04 20:47

Hi Friends,

Can anyone tell me what is the alternative of CreateRemoteThread in Win98 . How can i create a thread in Remote Process in Win98 operating system.

Thanx in advance !

Kuldeep

Re: CreateRemoteThread for Win98

Hans Ruck3-May-04 0:22

Hans Ruck

3-May-04 0:22

Use hooks, as in this article[^].

rechi

Re: Help regrarding TrayIcons.

Monty²2-May-04 20:24

Monty²

2-May-04 20:24

there are a couple of articles here at cp that show a ballon help one is CPPTooltip and another is by shog.

calculate the coordinates of ur tray icon (easier said than done Smile | :)

)
and show the ballon help

i can't even remember what my point is now, but anyway, i'm correct

Barring unforeseen acts of God and Adminstrators, my server will be up tomorrow. I'm more worried about the Adminstrators.

Re: Help regrarding TrayIcons.

Michael Dunn2-May-04 20:31

Michael Dunn

2-May-04 20:31

On XP, use the IUserNotification interface provided by the shell. On earlier OSes, you'll need to handle adding/removing the icon yourself.

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
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-- Buffy

Re: Help regrarding TrayIcons.

Prakash Nadar3-May-04 2:15

Prakash Nadar

3-May-04 2:15

Michael Dunn wrote:
On XP, use the IUserNotification interface provided by the shell. On earlier OSes, you'll need to handle adding/removing the icon yourself.

Thanx for the advice, but my software is targeted for varity of OS's so i cant use it even if i want to.

But i figured out that NIF_INFO in NOTIFYICONDATA by using Shell_NotifyIcon does the samething.

But i havent test it yet but seems like that what i am looking for.

Smile | :)

I'll write a suicide note on a hundred dollar bill - Dire Straits

simple postfix decrement

alex.barylski2-May-04 20:16

alex.barylski

2-May-04 20:16

I have the following snippet of code:

for(int i=nIndex; i>=0; i--){
	if(csBuff[i]==chDelim || csBuff[i]==LF) break;
}

I thought it would decrement i until a deliminator was found or until i == 0 in which case it would not execute anything inside the loop, nor would it decrement i anymore either...

to my surprise i is -1 and it's driving me nutts...

someone tell me this is normal or indicate the bug in my code....

Should I just test after the loop and make sure -1 becomes ZERO...like I thought it would and all post code assumes as well...?

Thanks

Cheer s Smile | :)

How do I print my voice mail?

Re: simple postfix decrement

Michael Dunn2-May-04 20:29

Michael Dunn

2-May-04 20:29

Hockey wrote:
I thought it would decrement i ... until i == 0

No, the loop runs as long as the condition i>=0 is true. When i is 0, the test becomes 0>=0 which is true, so the loop runs. If you want to stop when i is 0, the test should be i>0

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
There is a saying in statistics that a million monkeys pounding on typewriters would eventually create a work of Shakespeare. Thanks to the Internet, we now know that this is not true.

Re: simple postfix decrement

alex.barylski2-May-04 20:41

alex.barylski

2-May-04 20:41

I understand true would cause the loop to iterate again, but I still can't get the code working...

I'm trying to extract a word given an offset into a buffer using space as delimiters, this is what I have so far and it doesn't work...and I have no idea why...

// Find the index for the deliminator that the word starts on
for(int i=nIndex; i>0; i++){
	if(csBuff[i]==chDelim || csBuff[i]==LF) break;
}
	
// Concatenate each iterated character onto csWord
for(int j=i; j<csBuff.GetLength(); j++){
	if(csBuff[j]==chDelim || csBuff[i]==CR) break;

	csWord += csBuff[j];
}

Any idea?

Thank again Smile | :)

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