accessing a part of a char array - C / C++ / MFC Discussion Boards

Re: delete pointer

ChandraRam26-Dec-06 1:14

ChandraRam

26-Dec-06 1:14

John R. Shaw wrote:
I assume this is a joke, because of the smiley face marking the problem line.

The smiley face was unintentional - a result of for( ; ; ), with the spaces removed.

Smile | :)

Re: delete pointer

John R. Shaw26-Dec-06 1:29

John R. Shaw

26-Dec-06 1:29

I should have thought of that.

Wink | ;)

Note to self: Do not answer questions before your mourning coffee.

Re: delete pointer

ChandraRam26-Dec-06 1:31

ChandraRam

26-Dec-06 1:31

John R. Shaw wrote:
your mourning coffee.

There, there... dont take it to heart. Smile | :)

Re: delete pointer

John R. Shaw26-Dec-06 1:52

John R. Shaw

26-Dec-06 1:52

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: delete pointer

Mark Salsbery26-Dec-06 6:08

Mark Salsbery

26-Dec-06 6:08

So was this a joke? If not then

this code is bad:

char *ch=new char[100];
strcat(ch,achData);

You haven't initialized ch before using strcat() on it.

You are in an endless for loop so your "if(achData)//This code will not run never" will
never get called.

Re: delete pointer

Mark Salsbery26-Dec-06 6:10

Mark Salsbery

26-Dec-06 6:10

Sorry about that....I just noticed John Shaw already answered about the endless loop.
Sorry John Smile | :)

Re: delete pointer

Hamid_RT26-Dec-06 6:27

Hamid_RT

26-Dec-06 6:27

use of Ignore HTML tags when you want to psot code

WhiteSky

accessing a part of a char array

Johpoke25-Dec-06 23:37

Johpoke

25-Dec-06 23:37

Im working in C++ w MFC. In my program i create a char that looks kinda like this:

char data[11] = "1101110110";

and then later in the program i have a for which reads this binary data and does certain things depending on if its a 1 or 0:

for ( short c=0; c<=10; c++ )
{
if (data[c] == 1 )
{
//do this
}

}

But it doesn't work at all, the data[c] always seems to return 0 with the if..

any ideas?

maybe theres a better way to store my binary data (which is actually a lot longer, like 64 chars) and then do things depending on 1 or 0?

thanks!

man ive gotten like loads of post errors now..

/Johannes

Re: accessing a part of a char array

Johan Pretorius25-Dec-06 23:52

Johan Pretorius

25-Dec-06 23:52

you are testing ascii values
ie.
'1' == 49

for this to work you can test
if (data[c] == 49)

or you can test
if (data[c] == '1')

Hope this helps Smile | :)

Artificial Intelligence is no match for Natural Stupidity

No one can understand the truth until he drinks of coffee's frothy goodness. ~Sheik Abd-al-Kadir

I can't always be wrong ... or can I?

Re: accessing a part of a char array

sunit525-Dec-06 23:54

sunit5

25-Dec-06 23:54

if ( 1==(int)data[c])

never say die

Re: accessing a part of a char array

sunit526-Dec-06 0:01

sunit5

26-Dec-06 0:01

i m not able to modify my posting so a better way

int i=atoi(&data[c]);<br />
if ( 1==i)

never say die

Re: accessing a part of a char array

prasad_som25-Dec-06 23:54

prasad_som

25-Dec-06 23:54

Johpoke wrote:
if (data[c] == 1 )
{

change this to

if (data[c] == '1' )
{
//do this
}

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: accessing a part of a char array

S Douglas26-Dec-06 0:58

S Douglas

26-Dec-06 0:58

Johpoke wrote:
char data[11] = "1101110110";

Are you really using

data

as a chars or as numbers? You can't directly compair a number to a char.

If

data

is just an array of numbers and thats all its used for why not do an array of numbers then?

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Re: accessing a part of a char array (resolved)

Johpoke26-Dec-06 2:16

Johpoke

26-Dec-06 2:16

Ah yes of course thank you all!

/Johannes

How to Disable sound of a particular application

jk chan25-Dec-06 23:09

jk chan

25-Dec-06 23:09

Dear all,

Anyone have an idea about how to disable sound of a particular application. it may be a game exe or a swf(flash) file or any type. Is it possible ?

Using direct show filters(Overriding default filter) i can make it work with only media files. But i don't know how to prevent sound coming from an exe.

Any help is appreciated.
My project is just for study purpose.

Best Regards
krishnan

If u can Dream... U can do it

managing process

dvsr25-Dec-06 21:10

dvsr

25-Dec-06 21:10

Hi,
I am executing an exe file using CreateProcess. Is there any mechanisam to check wheather the .exe file is already running or not .

Thanks and Regards,
Venkat

Re: managing process

Michael Dunn25-Dec-06 21:44

Michael Dunn

25-Dec-06 21:44

Do a search for "single instance" - you'll find a few articles on the subject.

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

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

Ford, what's this fish doing in my ear?

Re: managing process

sunit525-Dec-06 21:48

sunit5

25-Dec-06 21:48

use PROCESSENTRY32

never say die

Re: managing process

prasad_som25-Dec-06 21:59

prasad_som

25-Dec-06 21:59

Use PROCESSENTRY32 as mentioned earlier.
See this[^] article about its usage.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: managing process

kasturi_haribabu25-Dec-06 22:28

kasturi_haribabu

25-Dec-06 22:28

Example For You:
HANDLE hWatchDog;
CProcessMonitor mProcessMonitor;
hWatchDog = mProcessMonitor.GetHandleToProcess("WatchDog.exe");
if(hWatchDog != NULL)
{
TerminateProcess(hWatchDog,0);
}

CProcess Monitor is the class, which is implemented using PSAPI.

HANDLE CProcessMonitor::GetHandleToProcess(CString ProcessName)
{
HANDLE hProcess;
hProcess = NULL;
char szProcessName[MAX_PATH] = "unknown";
char szTargetProcessName[MAX_PATH];
strcpy(szTargetProcessName,ProcessName.GetBuffer(50));
ProcessName.ReleaseBuffer();

ULONG lCpuusage = 0;
UINT index;

//Find Total Number of Processes;
if (!EnumProcesses( mAvailableProcesses, sizeof(mAvailableProcesses), &cbNeeded ) )
return hProcess;

// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);
if(cProcesses > 1000)
{
AfxMessageBox("There are Too Many applications Running on PC.");
}

for ( index = 0; index < cProcesses; index++ )
{
hProcess= GetProcessHandle(mAvailableProcesses[index],szTargetProcessName);
if(hProcess != NULL)
{
return hProcess;
}
}
return hProcess;
}

I think this should be enough for you.... Smile | :)

haribabu
(Impossible to understand Smile | :)

)

Re: managing process

Cristian Amarie25-Dec-06 22:29

Cristian Amarie

25-Dec-06 22:29

Use a separate thread to call CreateProcess and then a WaitXXX call.

DWORD WINAPI
_thWaitProcess(LPVOID pvParam)
{
	// retrieve parameters from pvParam
	HANDLE hProcess = ::CreateProcess( parameters_from_pvParam);
	// handle CreateProcess error

	HANDLE hLeaveEvent = get_leave_event(); // in case we want to stop watching

	HANDLE Handles[2] = {0};
	Handles[0] = hProcess;
	Handles[1] = hLeaveEvent;
	// wait for either process to finish or cancel listening event
	WaitForMultipleObjects(2, Handles, FALSE, INFINITE);

	return 0;
}

need math suggestions

includeh1025-Dec-06 20:38

includeh10

25-Dec-06 20:38

I want to draw an open line which smoothly passes several (or any number of) points.

those points are set by user with mouse clicking.

do you know any formula suitable for c++ code to draw the smooth line passing all of those points?

Re: need math suggestions

_AnsHUMAN_ 25-Dec-06 20:50

_AnsHUMAN_

25-Dec-06 20:50

includeh10 wrote:
want to draw an open line which smoothly passes several (or any number of) points.

A line, or straight line, can be described as an infinitely thin, infinitely long, perfectly straight curve.
Three or more points that lie on the same line are called collinear.
So for you, if the user clicks on different points that are not collinear than it won't be possible for you to connect this points using one single line. You would need to store the points in an array (or whatever you prefer) and then draw a line betweent the consecutive points.
You could prefer a curve if you want to connect these points but a single line won't do it, unless and until the points are collinear.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: need math suggestions

kasturi_haribabu25-Dec-06 22:31

kasturi_haribabu

25-Dec-06 22:31

Try Bezier curves.

Re: need math suggestions

Russell^'25-Dec-06 23:24

Russell^'

25-Dec-06 23:24

Use a spline!
You can implement it with polynomial expression joining 3 or 4 points each time and then join the splines obtained to get a continuos line.

Cheers,
Russell

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