C / C++ / MFC Discussion Boards

cje27-Jun-06 11:52

27-Jun-06 11:52

there are articles here on CodeGuru that are pretty good regarding DirectShow - you can also find some sample applications with the DirectX SDK

Functions with Pointer Parameters

Jay0327-Jun-06 10:10

Jay03

27-Jun-06 10:10

Hey guys,

I am trying to study how functions with POINTER PARAMETER WORKS. Does anyone know any link where I can study how Functions with pointer parameters work.

Thanks D'Oh! | :doh:

void ObjectRoot::classInit( RTI::RTIambassador* rtiAmb, const char* classIdStr )<br />
{<br />
   ObjectRoot::ms_rtiAmb = rtiAmb;<br />
   ObjectRoot::ms_classIdStr = classIdStr;<br />
<br />
   if ( ms_rtiAmb )<br />
   {<br />
      ms_classId = ms_rtiAmb->getObjectClassHandle( ms_classIdStr );<br />
   }<br />
}

Re: Functions with Pointer Parameters

Maximilien27-Jun-06 10:26

Maximilien

27-Jun-06 10:26

what's the problem ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Functions with Pointer Parameters

Jay0327-Jun-06 10:32

Jay03

27-Jun-06 10:32

I am trying to study how functions with POINTER PARAMETER WORKS. Do you know any good links which will provide me with the details of FUNCTIONS WITH POINTER PARAMETERS

Re: Functions with Pointer Parameters

led mike27-Jun-06 11:17

led mike

27-Jun-06 11:17

Microsoft C Bible[^]
cplusplus.com pointer tutorial[^]

Re: Functions with Pointer Parameters

Jun Du27-Jun-06 12:24

Jun Du

27-Jun-06 12:24

I'm wondering if you're going to again delete your post after getting the answer. For your reference, here is the link[^].

Best,
Jun

Re: Functions with Pointer Parameters

Jay0328-Jun-06 2:59

Jay03

28-Jun-06 2:59

Hey Jun,

Im new to this thing so im just messing around .. hahaha Smile | :)

Re: Functions with Pointer Parameters

Jun Du28-Jun-06 3:30

Jun Du

28-Jun-06 3:30

It's Ok. Hope you enjoy here.

Best,
Jun

Re: Functions with Pointer Parameters

Hamid_RT27-Jun-06 19:02

Hamid_RT

27-Jun-06 19:02

See Here[^]

whitesky

Re: Functions with Pointer Parameters

David Crow28-Jun-06 6:24

David Crow

28-Jun-06 6:24

Jay03 wrote:
...how Functions with pointer parameters work.

They work just the same as any other function does. When calling them, simply pass the variable's address instead of its actual value.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

expanding environment strings

neilsolent27-Jun-06 10:03

neilsolent

27-Jun-06 10:03

Has anyone written any code to expand a string with embedded environment variables in it, e.g.
%systemroot%\system32\drivers\etc\hosts

.. to form a literal string (as required by functions such as CreateFile()):

c:\windows\system32\drivers\etc\hosts

?

Many thanks.......

cheers,
Neil

Re: expanding environment strings

Michael Dunn27-Jun-06 11:38

Michael Dunn

27-Jun-06 11:38

Microsoft has. Wink | ;)

ExpandEnvironmentStrings()

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

VB > soccer

Re: expanding environment strings

neilsolent27-Jun-06 21:31

neilsolent

27-Jun-06 21:31

Thanks. I thought there had to be something, just couldn't spot it.

You the man! Smile | :)

cheers,
Neil

HBITMAP or CDC into a PDF File

Christopher Stratmann27-Jun-06 10:02

Christopher Stratmann

27-Jun-06 10:02

Anyone know how to place an HBITMAP into a PDF File? or Save a CDC as a PDF File?

Chris

Re: HBITMAP or CDC into a PDF File

C^hris L^osinger27-Jun-06 10:28

C^hris L^osinger

27-Jun-06 10:28

you'll probably have to convert that HBITMAP it into a JPG or TIFF or whatever format PDFs can handle.

Cleek | Image Toolkits | Thumbnail maker

Re: Char Pointers

Maximilien27-Jun-06 8:05

Maximilien

27-Jun-06 8:05

Yes, why ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Char Pointers

Christopher Stratmann27-Jun-06 23:59

Christopher Stratmann

27-Jun-06 23:59

I am using a CMSChart. When I want to save this thing as a file I have to copy the chart into the clipboard as a bitmap and then I can bring it out of the clipboard into an HBITMAP. From there I can save it as a bmp or a jpg. But then the user can easily go into paint and try to change the contents. If I could put the HBITMAP into a pdf then the average user will not be able to change or manipulate the picture.

Chris

Problems synchronizing multiple threads??

pavanbabut27-Jun-06 7:45

pavanbabut

27-Jun-06 7:45

Hi,
I am having an application written in vc++ in which it is having multiple threads (to say 2 threads) running parallel. These threads are created by the user at the same time, but ofcourse one after the other. I want them to be syncronized with each other so that they wont be off even by 33.3msec. Actuallly these two threads generate waveform signals through 2 waveform generator boards which finally generates images. So, the framerate will be at 30Hz. The problem is each thread generates two differnt images at the same frame rate, but while I replay the images they are "sometimes" off by one frame(33.3msec).
thanks,
-Pavan

Re: Problems synchronizing multiple threads??

Jun Du27-Jun-06 8:20

Jun Du

27-Jun-06 8:20

Have you implemented any synchronization mechanism between the two threads, or just created them and let them go?

Best,
Jun

Re: Problems synchronizing multiple threads??

mikeorama1234527-Jun-06 8:39

mikeorama12345

27-Jun-06 8:39

mswin does not provide us with much control of threads. They do not even give us a simple control to temporarily disable switching of threads. Just imagine if we could disable switching momentarily so that we could execute a couple of lines of code and guarantee that no other threads were run in between. It could prevent a mess of control flags.
Anyway, I always suggest... DO it in one thread! Then you do not have these problem!

Just livin a dream.. dont wake me!

Re: Problems synchronizing multiple threads??

David Crow27-Jun-06 9:09

David Crow

27-Jun-06 9:09

mikeorama12345 wrote:
Just imagine if we could disable switching momentarily so that we could execute a couple of lines of code and guarantee that no other threads were run in between.

Isn't this what a critical section does?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: Problems synchronizing multiple threads??

Michael Dunn27-Jun-06 11:44

Michael Dunn

27-Jun-06 11:44

All a critical section does is prevent another thread from running the protected section of code. He was asking about totally preventing other threads from running, which isn't possible.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

VB > soccer

Re: Problems synchronizing multiple threads??

Graham Bradshaw27-Jun-06 11:46

Graham Bradshaw

27-Jun-06 11:46

It is, but I think you have to be running Windows 3.1 Big Grin | :-D

Re: Problems synchronizing multiple threads??

Jun Du28-Jun-06 3:45

Jun Du

28-Jun-06 3:45

Michael Dunn wrote:
He was asking about totally preventing other threads from running,

I don't think so, but I'd like to hear what the originator says.

Michael Dunn wrote:
which isn't possible.

Why not?

Best,
Jun

Re: Problems synchronizing multiple threads??

John M. Drescher28-Jun-06 7:06

John M. Drescher

28-Jun-06 7:06

Jun Du wrote:
I don't think so, but I'd like to hear what the originator says.

Isn't this the only way both threads can remain time synchronized? I mean the only way I can see this to work is he has to have a dual processor dual core machine with the two threds on their own cpu and that the operating system will never schedule any other threads (or yield execution) on either of the cpus that are runing the two threads.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.