C / C++ / MFC Discussion Boards

Jesper Knudsen31-Mar-03 2:05

31-Mar-03 2:05

#define NEXT_INDEX ????<br />
<br />
void something()<br />
{<br />
   int A0 = NEXT_INDEX;   //compiles as: int A0 = 0<br />
   int A1 = NEXT_INDEX;   //compiles as: int A1 = 1<br />
   int A2 = NEXT_INDEX;   //compiles as: int A2 = 2<br />
   ...<br />
   ...<br />
}

Hi, how can I define NEXT_INDEX macro so that it increments by one, each time the compiler parses it?

Re: Automatic macro increment

Cedric Moonen31-Mar-03 2:25

Cedric Moonen

31-Mar-03 2:25

You can use a static variable that you increment with the macro. Something that looks like:

<br />
static int StaticIndex = 0;<br />
#define NEXT_INDEX  StaticIndex++;<br />

This should work!

Re: Automatic macro increment

Jesper Knudsen31-Mar-03 2:40

Jesper Knudsen

31-Mar-03 2:40

This would increment the index at runtime. What I need is the pre-processor to increment the index as it compiles so that the indices are found at compile time and fixed at runtime.

Something like this (which will not compile..)

#define AAA 0<br />
<br />
#define NEXT_INDEX<br />
{<br />
   AAA                   //insert as AAA<br />
   #define AAA (AAA+1)   //next time it is incremented by one<br />
}

First time using NEXT_INDEX it compiles to AAA (which is 0 at first), next time I want it to compile to 1. This setup imo makes sence, but not to the compiler..

Wink | ;)

Re: Automatic macro increment

Daniel Turini31-Mar-03 7:54

Daniel Turini

31-Mar-03 7:54

IMHO, there is no way of storing information at compile time. So, there is no way of storing a numbeer, incrementing and using it at compile time.

It's not the fall that kills you: it's the sudden stop - Down by Law, Jim Jamursch (1986)

Re: Automatic macro increment

Alvaro Mendez31-Mar-03 5:44

Alvaro Mendez

31-Mar-03 5:44

I'm pretty sure there's a clever template solution to this problem, but from looking at your example, I'm thinking it doesn't need to be too complicated.

Going on the assumption that your variable will be named with the same value as it holds (such that VARn = n), then you can create a simple macro that defines it, like this:

#define DEFINE_INDEX_VAR(prefix, number)  const int prefix##number = number
 
void something()
{
  DEFINE_INDEX_VAR(A, 0);
  DEFINE_INDEX_VAR(A, 1);
...
  DEFINE_INDEX_VAR(Z, 1000);
}

Regards,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

static control color

Cedric Moonen31-Mar-03 1:20

Cedric Moonen

31-Mar-03 1:20

Hi !!

This is a little stupid question but I don't know how to make it Smile | :)

I derived a class from the CStatic class and I draw the control myself in the Paint() function. But know I want it to have the "normal" grey color (the color of a standard push button for exaple) in the background. Does anybody know the RGB color code of it ?

Thanks

Re: static control color

Alin Negru31-Mar-03 1:31

Alin Negru

31-Mar-03 1:31

RGB(192, 192, 192) Smile | :)

Re: static control color

Cedric Moonen31-Mar-03 2:18

Cedric Moonen

31-Mar-03 2:18

Thanks but it's not the same gray Frown | :(

So, it's quite ugly because I use this control on a form so the colors are not exactly the same

Re: static control color

Gunnar Bolle31-Mar-03 2:40

Gunnar Bolle

31-Mar-03 2:40

uhh, bad idea - the color depends on your os settings.

use ::GetSysColor(COLOR_BTNFACE)

that should do it.

Re: static control color

Cedric Moonen31-Mar-03 2:54

Cedric Moonen

31-Mar-03 2:54

Thanks a lot!!

I was exactly searching for something like that Smile | :)

Help about appending the latest data to another file.

dxhdxh31-Mar-03 1:09

dxhdxh

31-Mar-03 1:09

I have two files:
a.txt:
20020102,23.0
20020103,23.0
.............
20021220,23.5
b.txt:
20010101,22
20010102,25
...........
20010301,35
Now I want to append the latest datas of the file "a.txt" to the file "b.txt". How could I do ! Please tell me the easy way to do it!
The focus is: I want appending the "latest" datas of a.txt to the file bb.txt
The latest datas in the file a.txt are the datas that are not included in the file b.txt.
Note: i only want to append the datas that the b.txt is not included.
Thanks a lot!

WebBrowser control questions

tinkywinky31-Mar-03 0:50

tinkywinky

31-Mar-03 0:50

Hi,

1. Is it possible to remove the right scrollbar of a WebBrowser control ?

2. In my control I load a page that open a new window with ad every 2 minutes, so i wrote this code to prevent this :

void CBrowserDlg::NewWindow2Explorer(LPDISPATCH* ppDisp, BOOL* Cancel)
{
*Cancel = TRUE;
}

The problem is that if I click on a link, and that link try to open a new window, it will be blocked, so is it possible to intercept the URL of the page that is going to be opened ?

Re: WebBrowser control questions

Stephane Rodriguez.31-Mar-03 1:10

Stephane Rodriguez.

31-Mar-03 1:10

tinkywinky wrote:
1. Is it possible to remove the right scrollbar of a WebBrowser control ?

I am doubtful that removing the WS_VSCROLL style would do much (especially since, from what I remember, several windows are embedded, not only one). After all, scrollbars are dynamically set and are part of the web browser.

tinkywinky wrote:
2. In my control I load a page that open a new window with ad every 2 minutes, so i wrote this code to prevent this :

Implement the BeforeNavigate2 event handler.

getting a file

Jump_Around31-Mar-03 0:42

Jump_Around

31-Mar-03 0:42

What is the easiest way of getting a file from the http protocol, of course without the prompt asking the user for confiramtion??

Re: getting a file

MarkusStr31-Mar-03 1:25

MarkusStr

31-Mar-03 1:25

see the functions

InternetOpen
InternetOpenUrl
InternetReadFile
InternetCloseHandle

..in this order .. and you should easily be able to download a file via http!

greetings

markus Smile | :)

Monitoring dialling - how?

Mark Otway31-Mar-03 0:08

Mark Otway

31-Mar-03 0:08

Hi all,

I'm trying to find out how I can 'get into' the ras dial process before a connection is established. Basically, I need to be able to measure the time it takes to carry out the various stages of dialling a connection - whether or not it's my app which instigates the dial.

Currently, I measure the dialling stages (dial, connect, auth, projection, etc) if I dial myself (using a RasDialFun and RasDial). I can measure the timings for the later stages of a dial (everything from Auth onwards) by using RasConnectionNotification to indicate a new connection being made, and then by polling with RasGetConnectStatus to see the later connection stages change. However, I have no way of detecting a new dial occurrence before the physical link is established.

Ideally, I'd like to be able to detect the dialling as soon as it occurred, and monitor the time it takes for the call to be answered (including failures, such as line engaged, etc) for *any* connection, instigated by any app (or even the user dialling via DUN). Is this possible?

Thanks

Mark

________________________
http://www.webreaper.net

Re: Monitoring dialling - how?

Ted Ferenc31-Mar-03 4:11

Ted Ferenc

31-Mar-03 4:11

I assume you are using the callback in RasDial e.g. RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError) and checking rasconnstate for all states such as RASCS_OpenPort

If not I can post the states I check.

I never managed to check for a line engaged, what happens is when a line is enaged you get a timeout notification, I would like to teminate the call on an engaed tone, so if you find out how I would be very interested to find out how you did it!

If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676

Re: Monitoring dialling - how?

Mark Otway31-Mar-03 4:21

Mark Otway

31-Mar-03 4:21

That's exactly what I'm doing, and it works perfectly - as long as I perform the dial myself.

However, I also want to monitor the dialling even if it's performed by another app, or by the user manually starting a connection via dial-up networking. In the latter case, whilst I can get an HRASCONN handle by enumerating RAS connections, it only 'appears' after the RASC_Auth status occurs - meaning I can't time the actually dialling part of the connection unless I initiate it.

Regarding the engaged error issue, I'm not sure - but it's something I have to handle/detect, so if I find a solution I'll post it back in this thread. Big Grin | :-D

________________________
http://www.webreaper.net

ntddk.h problem

vikramlinux30-Mar-03 23:57

vikramlinux

30-Mar-03 23:57

I have one code downloaded from
http://safariexamples.informit.com/0130869856/Samples/Chapt_04/DDISpy/
It is DDI functions spy.
When I start compiling the code. I get the error
"Cannot open include file: 'ntddk.h': No such file or directory"

I included the inc(include) and libfre\i386(library) in the project through the Tools->Options->Directories... but Still no effect...
what I need to do Confused | :confused:

VIkramS

Prb with PreCreateWindow

SatyaDY30-Mar-03 23:22

SatyaDY

30-Mar-03 23:22

Hi guys,
I want a SDI window without minimize, maximize buttons with maximized window. I have overwritten the PreCreateWindow's CREATE STRUCTURE like this:
cs.style=WS_MAXIMIZED | WS_OVERLAPPED | WS_SYSMENU | WS_BORDER; I am getting the window without the buttons but not maximized. What could be wrong??
Thanks in advance.
Satya

Re: Prb with PreCreateWindow

Cedric Moonen31-Mar-03 0:17

Cedric Moonen

31-Mar-03 0:17

An easier way to do this is to go in the InitInstance(à function of your App-derived class. It's in this function that the function is created.

Find these lines:

<br />
        m_pMainWnd->ShowWindow(SW_SHOW);<br />
	m_pMainWnd->UpdateWindow();<br />

and replace them by these ones:

<br />
	m_pMainWnd->ModifyStyle(WS_SYSMENU, NULL);<br />
	m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);<br />
	m_pMainWnd->UpdateWindow();<br />

Re: Prb with PreCreateWindow

SatyaDY31-Mar-03 0:49

SatyaDY

31-Mar-03 0:49

Thanks cedric,
I got it. Smile | :)

MPEG-1 length how?

Philip Patrick30-Mar-03 22:34

Philip Patrick

30-Mar-03 22:34

How can I retrieve an information about length (either in time or frames) from MPEG-1 file? I mean raw, without using any tools, not DirectX too.
The problem is that using DirectX and some other SDK, I'm getting different results, since I've seen in the past that DirectX had several bugs (when working with MPEGs), I can't say for sure which one is right. The difference I get is 24 frames (25 fps, which is almost a second).

Thanx

Philip Patrick
Web-site: www.stpworks.com
"Two beer or not two beer?" Shakesbeer

Re: MPEG-1 length how?

Philip Patrick31-Mar-03 0:08

Philip Patrick

31-Mar-03 0:08

Still haven't found an answer (if anyone know, post please), but found that DirectX still have problems and I cannot work with it if I want frame-accurate Frown | :(

Philip Patrick
Web-site: www.stpworks.com
"Two beer or not two beer?" Shakesbeer

Re: MPEG-1 length how?

_Theo_31-Mar-03 0:50

_Theo_

31-Mar-03 0:50

Here's some header info for the MPEG file format which should help you:

1-4 byte Sequence header In Hex 000001B3
12 bits Horizontal size In pixels
12 bits Vertical size In pixels
4 bits Pel aspect ratio
18 bits Picture rate

Mind the difference between bits and bytes here. Only the sequence header is four whole bytes, the rest are all a certain amount of bits.

The picture rate stands for a certain frame rate:
1 = 23.976 frames/sec
2 = 24
3 = 25
4 = 29.97
5 = 30
6 = 50
7 = 59.94
8 = 60

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