Friday, 8 December 2006
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| You Must View This Videoclip! Zargof 00:35:48 |
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| |  31 answer | Add comment |
Thursday, 7 December 2006
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| callbacks .. events Indika Bandara 22:48:32 |
| | hello,
can somebody help me in explaining howto write event driven programs
with C(not related go GUI events). for example when data arrives at a
socket how can you run a specific function(rather than implicitly
calling it) i read somewhere that callbacks can be used but don't know
how.
i know of one method of handling events related to files i.e using
select() sys call
thank you
indika
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| | 10 answers | Add comment |
|
| C or C++ Project Text Editor Ajay 22:24:58 |
| | Hi
I need Project Text Editor in C OR C++.
Please send me the code.
Regards
ajay
Gurgaon
ajaykataria2002@yahoo.com [mailto:ajaykataria2002%40yahoo.com]
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| | 2 answer | Add comment |
|
| height Behavior Unaffected 22:02:03 |
| | |
| | Add comment |
|
| DOS question (revised) Rob C 20:54:22 |
| | I have used powerC (DOS) from Mix software for many years. There
are two functions in powerC called readch(); and readattr();
which reads the characters and attributes of the current cursor
position, which I then take and store in a file. IÆm now using
the DOS (standard) platform of Borland C++ 5.02 and am asking
what function(s) I would use to perform this same operation.
It has been suggested I use gettextinfo(); I looked into that.
It seems to me this would not return the sort of byte by byte
inforfmation that IÆm looking for.
Another suggestion was gettext(); This seems a bit more what IÆm
looking for, although IÆm still unclear how I could later access
the second sub, cell attribute. (In the example, puttext(),
thatÆs supposed to print out (or recall) the value that
gettext() earlier read, did not do anything.) And then I have to
be able to store the row and column position, too.
Following is a code fragment I wrote in powerC to accomplish this task. The computer reads one x/y position each iteration and returns the foreground and background color, as well as the character (if any), at that particular position. I write all this plus the row and column position to a file, which then another function, writescreen(), reads and prints back on the screen.
variables startrow, endrow, startcol, and endcol are the window parameters.
for( row=startrow; row<= endrow; row++ ) /* Save what's there */
{ //289
for( col=startcol; col<= endcol; col++ )
{ //291
poscurs( row, col ); //<-- position the cursor and read
ch = readch();
attr= readattr();
//now I write the info to file
SaveScreen( ch, attr, row, col );
} //291
} //289
|
| | 7 answers | Add comment |
|
| [ROOT] G__exception Alberto Pulvirenti 17:38:08 |
| | Hi all,
is that possible that I get this error message
Error: Symbol G__exception is not defined in current scope rec.C:3:
Error: type G__exception not defined
FILE:/home/pulvir/events/head-2006-11-22/gun/./rec.C LINE:3
because of something I didn't do when compiling ROOT?
Thanks.
Alberto
-- >>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>>
Alberto Pulvirenti, Ph. D.
University of Catania,
Department of Physics & Astronomy
Via Santa Sofia, 64
I-95123, Catania, Italy
Tel :+39-095-3785286 >>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>>
|
| | 2 answer | Add comment |
|
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| | 1 answer | Add comment |
|
| inter thread communication Indika Bandara 07:19:56 |
| | hello,
how is inter-thread communication done?
say i want to send a string from thread_A(or main) to thread_B to
print it on to stdout how can i do it?
pipes are used between processes as opposed to threads isn't it?
TIA
indika
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| | 8 answers | Add comment |
|
| [ROOT] compilation problem Stilianos Kesisoglou 00:35:11 |
| | Hi,
I've noticed strange(?) behavior when creating a shared library with ACLiC,
although I am not sure if it's important or not
The following piece of code fails to compile:
#include <iostream>
#include "TROOT.h"
#include "TCanvas.h"
void Performance()
{
if ((TCanvas*)gROOT->GetListOfCanvases()->FindObject("c1"))
{c1->Clear();} else {TCanvas *c1 = new TCanvas();}
....
}
with the following error:
root [0] .L Performance.C++
Info in <TUnixSystem::ACLiC>: creating shared library
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/./Performance_C.so
In file included from
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/fileHWpokk.h:29,
from
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/fileHWpokk.cxx:13:
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/Performance.C: In
function `void Performance()':
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/Performance.C:16: `
c1' undeclared (first use this function)
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/Performance.C:16: (Each
undeclared identifier is reported only once for each function it appears
in.)
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/Performance.C:16: warning: unused
variable `TCanvas*c1'
g++x:
/rooms/salon/work/kesisogl/Thesis/PhotonPointingDevelopment/RandomTracksAnal
ysis/./fileHWpokk.o: No such file or directory
Error in <ACLiC>: Compilation failed!
If the code is written as follows:
#include <iostream>
#include "TROOT.h"
#include "TCanvas.h"
void Performance()
{
// TCanvas *c1 = (TCanvas*)gROOT->GetListOfCanvases()->FindObject("c1");
//
// if (c1) {c1->Clear();} else {c1 = new TCanvas();}
if ((TCanvas*)gROOT->GetListOfCanvases()->FindObject("c1"))
{c1->Clear();} else {TCanvas *c1 = new TCanvas();}
....
}
it compiles ok. I am not sure, perhaps I am making a mistake here but
shouldn't be the same?
Thanks!
Stelios.
|
| | 8 answers | Add comment |
Wednesday, 6 December 2006
|
| How to execute DOS command Deepak Battu 23:26:46 |
| | Hi ,
How can we execute a dos command from the c program.please provide
syntax.
deepak
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