C / C++ / MFC

5-Mar-04 11:49

how do you get your program to communicate across a LAN?

til

Re: networking

Rickard Andersson²⁰5-Mar-04 13:12

Rickard Andersson²⁰

5-Mar-04 13:12

By using Winsock. Search this site and you'll find a dozen of articles about network programming!

Rickard Andersson
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Re: networking

Prakash Nadar6-Mar-04 3:15

Re: Message Maps in Services

6-Mar-04 3:15

I guess ur problem is related to proxy servers... you need to know about the type of proxy server you have.. mostly it is HTTP 1.1

This space is empty.

Message Maps in Services

mmica5-Mar-04 10:59

mmica

5-Mar-04 10:59

Hi,

I wrote a test application that trapped WM_DEVICECHANGE. It worked fine so I tried the same thing in a service but I can't seem to catch events in services. Am quite a newbie to Visual C++ so would appreciate all the help i can get.

Can I trap such events in services?

Mark

Prakash Nadar5-Mar-04 13:23

5-Mar-04 13:23

Create a hidden window in the service and in then message proc you can then listen to the messages.

Interviewer (me) : "Did you install Linux all my yourself?"
Candidate : "Yes i installed Linux all my yourself."

Help with OnPaint

S van Leent5-Mar-04 10:56

S van Leent

5-Mar-04 10:56

Currently, I have this code in my on paint event in a view.

<br />
	CPaintDC dc(this);<br />
<br />
	CPoint originalSize = matrix.GetSize();<br />
	int y, x;<br />
<br />
	for (y = 0; y < size.y; y++)<br />
	{<br />
		for (x = 0; x < size.x; x++)<br />
		{<br />
			dc.SetPixelV(CPoint(x,y), obj.GetColorRef(CPoint(x, y)));<br />
		}<br />
	}<br />
<br />

As you can understand, this is pretty slow with soewhat bigger pictures where for example, tje size is over 1000 x 1000 pixels. A solution, as far as I know, is to use a memory DC. However, I am doing something wrong.

I want to create the memory DC with the following

<br />
	CPaintDC dc(this);<br />
	CDC pdc;<br />
	dc.CreateCompatibleDC(&pdc);<br />
<br />
	CPoint originalSize = matrix.GetSize();<br />
	int y, x;<br />
<br />
	for (y = 0; y < size.y; y++)<br />
	{<br />
		for (x = 0; x < size.x; x++)<br />
		{<br />
			pdc.SetPixelV(CPoint(x,y), obj.GetColorRef(CPoint(x, y)));<br />
		}<br />
	}<br />
<br />
	dc.BitBlt(0, 0, size.x, size.y, ...)	<br />
<br />

However, the first time only a black block was drawn then, when resizing things go wrong (the app crashes), where a colored block should be drawn. What am I doing wrong, and if I am doing it wrong, how should I do it?

LPCTSTR Dutch = TEXT("Double Dutch Smile | :)

");

LunaticFringe5-Mar-04 12:46

LunaticFringe

5-Mar-04 12:46

You need to allocate a bitmap (ideally a DIBSection) of the appropriate size and select it into the device context. The default bitmap in a freshly created DC is 1x1. If you use a DIBSection, you can get direct access to the bitmap's pixel data. This can dramatically speed up pixel manipulation.

Prakash Nadar5-Mar-04 13:21

5-Mar-04 13:21

The effective way of createing a memory dc.

HDC memDC = CreateCompatibleDC ( hDC );
HBITMAP memBM = CreateCompatibleBitmap ( hDC );
SelectObject ( memDC, memBM );

Interviewer (me) : "Did you install Linux all my yourself?"
Candidate : "Yes i installed Linux all my yourself."

John R. Shaw6-Mar-04 6:18

John R. Shaw

6-Mar-04 6:18

Go look in the "Bitmaps & Pallettes" section of codeproject; both CDibSectionLite and CDibData provide ways of accessing pixels directly without having to select them into a DC first.

Note: Accessing pixel data through any DC is very slow.

INTP

play music in the background of my program

Joe Woodbury6-Mar-04 11:51

Joe Woodbury

6-Mar-04 11:51

As was suggested before you need to create a compatible bitmap. You also need to pass the dc from the paint DC to the CreateCompatibleDC function, not the other way around.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

til rules5-Mar-04 10:41

Re: play music in the background of my program

5-Mar-04 10:41

hi, i made a program in MFC C++ 6 and want to put music in the background. is there an easy way to do this?

thanks,
til

LunaticFringe5-Mar-04 12:41

LunaticFringe

5-Mar-04 12:41

PlaySound.

in confused

til rules5-Mar-04 10:18

5-Mar-04 10:18

hi all,
iv been programming in MFC (visual c++ 6) for a few months and i am confused at the difference between public, and protected code. Whats the point of putting public at the top of a section, or private. Please help

many thanks

til Big Grin | :-D

Re: in confused

David Crow5-Mar-04 10:24

David Crow

5-Mar-04 10:24

Protected indictates that only member functions, friends, and derived classes can access the members of that class. Public indicates that the members of that class are accessible by all. Private indicates that only member functions and friends can access the members of that class.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: in confused

BlackDice5-Mar-04 10:26

BlackDice

5-Mar-04 10:26

private keeps things from being utilized by other classes on accident, or maybe even another user if you plan to let someone else use your classes down the line.

Protected only allows access by derived classes, so it's private to itself and any of its children that are derived from it.

public is letting everyone have access, so that if you have a CEdit control object declared as public, another dialog or screen can access it.

If it's broken, I probably did it

bdiamond

Re: in confused

til rules5-Mar-04 10:31

Displaying a list of CD/DVD drives

5-Mar-04 10:31

Cheers guys, i appreciate it alot Big Grin | :-D

til

Dev5785-Mar-04 10:06

Dev578

5-Mar-04 10:06

I am using MFC, how would I go about finding and displaying all of the CD/DVD drives of the users computer? I have been looking around for articles, and have not found anything yet. Any help is appreciated.

-Dev578

mmica5-Mar-04 10:09

mmica

5-Mar-04 10:09

Take a look at _getdrives() and GetDriveType() in MSDN.

There is also an example.

David Crow5-Mar-04 10:19

David Crow

5-Mar-04 10:19

mmica wrote:
Take a look at _getdrives()...

This does not sound like a valid function. Are you sure it exists?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Prakash Nadar5-Mar-04 13:15

5-Mar-04 13:15

Yeah it does, many microsoft C api/functions starts with _ for some compatiblity issue.

Interviewer (me) : "Did you install Linux all my yourself?"
Candidate : "Yes i installed Linux all my yourself."

David Crow5-Mar-04 10:17

David Crow

5-Mar-04 10:17

Have you seen the Enumdisk1 sample (article Q264203) on MSDN? It uses the Setup class GUID_DEVCLASS_DISKDRIVE GUID (4D36E967-E325-11CE-BFC1-08002BE10318 I think) to enumerate all the disk devices that are installed in the system.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)