C / C++ / MFC

Re: Modifying external files

12-Aug-02 18:23

AfxGetMainWnd() returns the main window, you just need to cast it to be a CMainFrame.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Modifying external files

Anonymous12-Aug-02 17:54

Anonymous

12-Aug-02 17:54

(Newbie-Warning!)

Hi,
Is there anyone that got a short sample code on how to edit/modify the contents of an external binary file at an exact position?
I've read some articles on how to modify ASCII files, but when it comes to binary files and modifying data in an exact offset location (like a hexeditor)... I'm stuck...

OMG | :OMG:

Regards,
Johan

C^hris L^osinger12-Aug-02 19:23

C^hris L^osinger

12-Aug-02 19:23

fopen(filename, "wb");
fseek(pos, offset);
fwrite(data, size, count, filePointer);
fclose(filePointer);

-c

Conservative:
One who admires radicals centuries after they're dead.
-- Leo C. Rosten

image effects!

Re: Modifying external files

Anonymous12-Aug-02 20:10

Anonymous

12-Aug-02 20:10

Thanks for your quick help!
I'm now heading for my keyboard to try it out!! Smile | :)

/Johan

What purpose does this type of class declaration serve?

clintsinger12-Aug-02 17:20

clintsinger

12-Aug-02 17:20

If I have a class A, I can also create a class within it called B. Is there any practical use for this? To illustrate my question I will give an example.

<br />
class A<br />
{<br />
  int m_nMemberOfA;<br />
<br />
  class B<br />
  {<br />
  public:<br />
    void MethodOfB();<br />
  };<br />
};<br />
<br />
...<br />
<br />
void A::B::MethodOfB()<br />
{<br />
  ...<br />
  // Is it possible to access A::m_nMemberOfA?<br />
}<br />

Can B gain access to the member variables of A or anything like that without having to pass the "this" pointer?

Thanks in advance,
Clint

Re: What purpose does this type of class declaration serve?

Christian Graus12-Aug-02 17:25

Re: What purpose does this type of class declaration serve?

12-Aug-02 17:25

clintsinger wrote:
Can B gain access to the member variables of A or anything like that without having to pass the "this" pointer?

No, of course not. What would happen if they both had an int called a ?

You'd encapsulate one class within another if it existed solely as a helper for that class, if only class A had a need to create instances of class B. Then you could make it private or protected in class A, and control the fact that only class A could make them.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

JT Anderson13-Aug-02 7:21

JT Anderson

13-Aug-02 7:21

I think your question is, are nested classes in C++ like inner classes in Java? The answer is no. Offhand, I'd say they are much like static nested classes in Java.

The purpose of nested classes is to express scoping of names.

How to write data to cdr

nlecren12-Aug-02 17:15

nlecren

12-Aug-02 17:15

Does anyone know how to write data to cd-r drives using IoControl codes in the platform sdk??

Re: How to write data to cdr

Christian Graus12-Aug-02 17:26

Re: How to write data to cdr

12-Aug-02 17:26

The fact that several expensive SDK's exist to do this suggests to me that it is not an easy task.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Scott H. Settlemier13-Aug-02 5:23

Scott H. Settlemier

13-Aug-02 5:23

Check out the Image Mastering API (IMAPI)
available now under WinXP.

Re: How to write data to cdr

nlecren13-Aug-02 7:08

nlecren

13-Aug-02 7:08

Was going to use that but it only works on XP not 2000/me/98 etc..

Thanks

Re: splitting

Christian Graus12-Aug-02 16:05

12-Aug-02 16:05

Why have you asked this question three times ?

I'm fairly sure there is an example on the site. The app wizard also creates an app with one splitter, it should not be hard to increase the count to support four views, I would think.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: splitting

wong190712-Aug-02 16:36

12-Aug-02 16:36

I also try to find this on the site, but I can't got it. Could you mind tell me where can i find it? Big Grin | :-D

Re: splitting

Christian Graus12-Aug-02 17:11

How to create your own "ad hoc" framework?

12-Aug-02 17:11

I dunno, I thought I'd seen it. Maybe it was in MSDN.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Anonymous12-Aug-02 15:54

Anonymous

12-Aug-02 15:54

hello Everybody,

I am working on a project involving PCs as peer sensors on a network. The sensor can use ccd cameras (microscops), can process acquired images, can replicate data on an overlay network (P2P), can distribute processing (actually start, control and stop them remotely).

I'd like to create a object-oriented, component-oriented "generic" framework in C++... for sensors in general and for my application in particular. Also, I'd like to have some functionalities (Input, Processing, Networking...), as independent components, i.e. that can be used without the others (separate DLLs?).

Sensor Component
|
|- Input Component
|
|- Processing Component
|
|- Networking Component
|
|- Coordinator Component

MySensor Component : inherited from Sensor Component
|
|- Vision Component : inherited from Input Component
|
|- MyProcessing : inherited from Processing Component
|
|- P2P : inherited from Networking Component
|
|- MyCoordinator : inherited from Coordinator Component

How do I make such a framework? What tools are the easiest?
Where should I start?
Should I buy a book "creating our own framework for dummies"?

Any comments are welcome!!
Thanks a lot!

Bertrand Boichon

Research Assistant
Electrical & Computer Engr.
Oregon State University

Re: How to create your own "ad hoc" framework?

Tomasz Sowinski12-Aug-02 23:00

Tomasz Sowinski

12-Aug-02 23:00

Anonymous wrote:
I'd like to create a object-oriented, component-oriented "generic" framework in C++...

Your description suggests a class library, not the framework. What exactly do you mean by 'generic'? 'Generic' as in 'generic programming'?

Tomasz Sowinski -- http://www.shooltz.com

What is "scratch" and why can everything be made from it?

splitting view

wong190712-Aug-02 15:49

12-Aug-02 15:49

I want to ask how to display four view at the same time(i.e. splitting), each views are come from different class?? (e.g view1, view2 view 3, view4)

Smile | :)

Weiye Chen12-Aug-02 18:39

Weiye Chen

12-Aug-02 18:39

You want to display in 2x2 or 4x1 or 1x4??

Weiye, Chen
When pursuing your dreams, don't forget to enjoy your life...

wong190712-Aug-02 19:54

12-Aug-02 19:54

i WANT TO DISPLAY 2X2
THX!!!

Weiye Chen12-Aug-02 20:16

Weiye Chen

12-Aug-02 20:16

Then you can try this

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/,<br />
	CCreateContext* pContext)<br />
{<br />
	// Create splitter window for 2 rows, 2 cols, abort if failed<br />
	if (m_wndSplitter.CreateStatic(this, 2, 2) == FALSE)<br />
		return FALSE;<br />
<br />
	// Create each view for each pane, abort if failed<br />
	if (m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CView1), CSize(100, 100), pContext) == FALSE ||<br />
            m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CView2), CSize(100, 100), pContext) == FALSE ||<br />
            m_wndSplitter.CreateView(1, 0, RUNTIME_CLASS(CView3), CSize(100, 100), pContext) == FALSE ||<br />
            m_wndSplitter.CreateView(1, 1, RUNTIME_CLASS(CView4), CSize(100, 100), pContext) == FALSE)<br />
  	        return FALSE;<br />
<br />
	// Splitter window and views created successfully<br />
	return TRUE;<br />
}

Weiye, Chen
When pursuing your dreams, don't forget to enjoy your life...

wong190712-Aug-02 21:46

12-Aug-02 21:46

Thx you very much!!!

But when I execute it
it tell me
CView1 is not a class or namespace name
classCView1: undeclared identifier

CView2 is not a class or namespace name
classCView2: undeclared identifier

CView3 is not a class or namespace name
classCView3: undeclared identifier

CView4 is not a class or namespace name
classCView4: undeclared identifier

How can I solve it?
Sorry for I have many question!!!