timeout for while loop - C / C++ / MFC Discussion Boards

lihin0028-Jul-05 9:21

28-Jul-05 9:21

Say i have a client and server. Server listening at 10.10.10.10 on port 4000. Client connects from 11.11.11.11. Server sends back a message saying:

"You are connected from <ip> on port <port>"

Where having the server use GetPeerName would give the proper ip of 11.11.11.11, but the port will be some other number other than 4000 in my case. So the message to the client would say something like:

"You are connected from 11.11.11.11 on port 3000"

Should GetPeerName be returning 4000 as the port? Or is the port of the client just a random one?

Re: What port is GetPeerName returning?

Alexander ^M.,28-Jul-05 9:29

Alexander ^M.,

28-Jul-05 9:29

Type: netstat -n
GetPeerName will return the "remote address" column (only a single item of course).

Don't try it, just do it! Wink | ;-)

Re: What port is GetPeerName returning?

lihin0028-Jul-05 9:36

lihin00

28-Jul-05 9:36

Ok thanks. The client port is just a random one. I get it now.

sndvol32?

billiam90428-Jul-05 8:57

billiam904

28-Jul-05 8:57

I am starting a project soon and the contact wants to control the record volume settings from within the application. Is there a way to do this with sndvol32 or some other way without using DirectX? He is concerned about file size, that's why he doesn't wish to use DirectX. Thanks.

Bill Dennis
Orlando, FL

Re: sndvol32?

Alexander ^M.,28-Jul-05 9:06

Alexander ^M.,

28-Jul-05 9:06

billiam904 wrote:
He is concerned about file size

Using DirectX does not create big binaries at all!

By the way: DirectX does adjust the volume of a single buffer, but not the volume of the system. You can use waveOutSetVolume to set the output volume.

Don't try it, just do it! Wink | ;-)

Re: sndvol32?

billiam90428-Jul-05 9:10

billiam904

28-Jul-05 9:10

what would i use to set the Line In record level?

Bill Dennis
Orlando, FL

Re: sndvol32?

Alexander ^M.,28-Jul-05 9:14

Alexander ^M.,

28-Jul-05 9:14

mixerSetControlDetails

Don't try it, just do it! Wink | ;-)

timeout for while loop

trigger9128-Jul-05 8:53

trigger91

28-Jul-05 8:53

Hi,
I am quite new to vc++. I am doing a project in win32. I want to set timeout value for a while loop. I am checking a condition in a while loop. If that condition is not satisfied at all, instead of looping forever I want to set timeout value like 300 msec then exit the while loop. I want to do this with CreateEvent() and waitforsingleobject(), but I dont know how to do it exactly.
Can someone help me with sample code???
Thanks a lot.

Re: timeout for while loop

Alexander ^M.,28-Jul-05 8:57

Alexander ^M.,

28-Jul-05 8:57

You can't create an easy timeout loop that way. What kind of code is running in the loop? There are normally better ways.

Don't try it, just do it! Wink | ;-)

Re: timeout for while loop

trigger9128-Jul-05 9:33

trigger91

28-Jul-05 9:33

Actually inside the while loop I am reading or writing to a usb device using our library apis...what are the other ways doing it better.

Re: timeout for while loop

Alexander ^M.,29-Jul-05 4:26

Alexander ^M.,

29-Jul-05 4:26

Use completion routines and kinda timeout thread, that makes it easier.

Don't try it, just do it! Wink | ;-)

Re: timeout for while loop

Peter Weyzen28-Jul-05 9:46

Peter Weyzen

28-Jul-05 9:46

HANDLE hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );<br />
<br />
while ( looping )<br />
{<br />
    if( WaitForSingleObject( hEvent, 300 ) == WAIT_TIMEOUT )<br />
    {<br />
        // timeout expired<br />
    }<br />
    else<br />
    {<br />
        // someone called SetEvent on my hEvent (likely)<br />
        // use SetEvent for cause the wait to expire<br />
    }<br />
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Re: timeout for while loop

Alexander ^M.,29-Jul-05 4:25

Alexander ^M.,

29-Jul-05 4:25

That does not work because when there are more than 1 loop the timeout will be 300ms FOR EVERY LOOP, and not for the whole loop.

Don't try it, just do it! Wink | ;-)

Re: timeout for while loop

David Crow29-Jul-05 6:03

David Crow

29-Jul-05 6:03

Where was it mentioned that multiple loops were involved?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: timeout for while loop

nm_11429-Jul-05 14:16

nm_114

29-Jul-05 14:16

I don't know if this is a good way to do it but you could try something like:

DWORD t = GetTickCount();
while (1)
{
if ((GetTickCount() - t) > 300)
	break;
}

read from comport problem

quarry_0628-Jul-05 8:42

quarry_06

28-Jul-05 8:42

Hi I am using the library I found here:
http://www.codeproject.com/system/serial.asp
in my program. However, I run into the following problem when I am reading from a comport. (example listener).

I took the code, and created a little function

int readme(CSerial &serial)<br />
{<br />
	LONG    lLastError = ERROR_SUCCESS;<br />
	lLastError = serial.SetMask(CSerial::EEventBreak |<br />
								CSerial::EEventCTS   |<br />
								CSerial::EEventDSR   |<br />
								CSerial::EEventError |<br />
								CSerial::EEventRing  |<br />
								CSerial::EEventRLSD  |<br />
								CSerial::EEventRecv);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port event mask"));<br />
<br />
	// Use 'non-blocking' reads, because we don't know how many bytes<br />
	// will be received. This is normally the most convenient mode<br />
	// (and also the default mode for reading data).<br />
    lLastError = serial.SetupReadTimeouts(CSerial::EReadTimeoutNonblocking);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port read timeout."));<br />
	<br />
	bool fContinue = true;<br />
	do<br />
	{<br />
		// Wait for an event<br />
		lLastError = serial.WaitEvent();<br />
		if (lLastError != ERROR_SUCCESS)<br />
			return ::ShowError(serial.GetLastError(), _T("Unable to wait for a COM-port event."));<br />
<br />
		// Save event<br />
		const CSerial::EEvent eEvent = serial.GetEventType();<br />
<br />
		// Handle break event<br />
		if (eEvent & CSerial::EEventBreak)<br />
		{<br />
			printf("\n### BREAK received ###\n");<br />
		}<br />
<br />
		// Handle CTS event<br />
		if (eEvent & CSerial::EEventCTS)<br />
		{<br />
			printf("\n### Clear to send %s ###\n", serial.GetCTS()?"on":"off");<br />
		}<br />
<br />
		// Handle DSR event<br />
		if (eEvent & CSerial::EEventDSR)<br />
		{<br />
			printf("\n### Data set ready %s ###\n", serial.GetDSR()?"on":"off");<br />
		}<br />
<br />
		// Handle error event<br />
		if (eEvent & CSerial::EEventError)<br />
		{<br />
			printf("\n### ERROR: ");<br />
			switch (serial.GetError())<br />
			{<br />
			case CSerial::EErrorBreak:		printf("Break condition");			break;<br />
			case CSerial::EErrorFrame:		printf("Framing error");			break;<br />
			case CSerial::EErrorIOE:		printf("IO device error");			break;<br />
			case CSerial::EErrorMode:		printf("Unsupported mode");			break;<br />
			case CSerial::EErrorOverrun:	printf("Buffer overrun");			break;<br />
			case CSerial::EErrorRxOver:		printf("Input buffer overflow");	break;<br />
			case CSerial::EErrorParity:		printf("Input parity error");		break;<br />
			case CSerial::EErrorTxFull:		printf("Output buffer full");		break;<br />
			default:						printf("Unknown");					break;<br />
			}<br />
			printf(" ###\n");<br />
		}<br />
<br />
		// Handle ring event<br />
		if (eEvent & CSerial::EEventRing)<br />
		{<br />
			printf("\n### RING ###\n");<br />
		}<br />
<br />
		// Handle RLSD/CD event<br />
		if (eEvent & CSerial::EEventRLSD)<br />
		{<br />
			printf("\n### RLSD/CD %s ###\n", serial.GetRLSD()?"on":"off");<br />
		}<br />
<br />
		// Handle data receive event<br />
		if (eEvent & CSerial::EEventRecv)<br />
		{<br />
			// Read data, until there is nothing left<br />
			DWORD dwBytesRead = 0;<br />
			char szBuffer[101];<br />
			do<br />
			{<br />
				// Read data from the COM-port<br />
				lLastError = serial.Read(szBuffer,sizeof(szBuffer)-1,&dwBytesRead);<br />
				if (lLastError != ERROR_SUCCESS)<br />
					return ::ShowError(serial.GetLastError(), _T("Unable to read from COM-port."));<br />
<br />
				if (dwBytesRead > 0)<br />
				{<br />
					// Finalize the data, so it is a valid string<br />
					szBuffer[dwBytesRead] = '\0';<br />
<br />
					// Display the data<br />
					printf("%s|", szBuffer);<br />
					<br />
					// Check if EOF (CTRL+'[') has been specified<br />
					if (strchr(szBuffer,EOF_Char))<br />
						fContinue = false;<br />
				}<br />
			}<br />
		    while (dwBytesRead == sizeof(szBuffer)-1);<br />
		}<br />
	}<br />
	while (fContinue);<br />
	serial.Close();<br />
	lLastError = serial.Open(_T("COM1"),0,0,false);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to open COM-port"));<br />
<br />
    // Setup the serial port (9600,8N1, which is the default setting)<br />
    lLastError = serial.Setup(CSerial::EBaud38400,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port setting"));<br />
	return 0;<br />
}

then, what I do is following:

int __cdecl _tmain (int /*argc*/, char** /*argv*/)<br />
{<br />
    CSerial serial;<br />
	LONG    lLastError = ERROR_SUCCESS;<br />
<br />
    // Attempt to open the serial port (COM1)<br />
    lLastError = serial.Open(_T("COM1"),0,0,false);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to open COM-port"));<br />
<br />
    // Setup the serial port (9600,8N1, which is the default setting)<br />
    lLastError = serial.Setup(CSerial::EBaud38400,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);<br />
	if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Unable to set COM-port setting"));<br />
<br />
    // Register only for the receive event<br />
    <br />
<br />
    // Keep reading data, until an EOF (CTRL-Z) has been received<br />
<br />
	//lLastError = serial.Write("\n");<br />
	//Sleep(1000);<br />
lLastError = serial.Write("\nwhoami\n");<br />
int r;<br />
//r = readme(serial);<br />
if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Error sending a return"));<br />
lLastError = serial.Write("\nwhoami\n");<br />
		 <br />
r = readme(serial);<br />
if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Error sending a return"));<br />
<br />
		//r = readme(serial);<br />
<br />
		//lLastError = serial.Write("\nwhoami\n");<br />
if (lLastError != ERROR_SUCCESS)<br />
		return ::ShowError(serial.GetLastError(), _T("Error sending a return"));<br />
<br />
    // Close the port again<br />
    serial.Close();<br />
    return 0;<br />
}

ok when the first is commented out, I see the results of both functions. but when the first readme is there, it only reads up to that point, and goes no further.

why is that so? I would like to read information step by step, as it needs to processed.

thanks alot for any help

quarry

Re: read from comport problem

Bob Stanneveld28-Jul-05 19:19

Bob Stanneveld

28-Jul-05 19:19

Hello,

Put the caret next to that line and than hit "run to cursor" in your Debug menu. Second step in your code and see where your code hangs and post more specific information on your problem. Until then, most people here will not bother to look at your post with so much code.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: read from comport problem

quarry_0629-Jul-05 8:15

quarry_06

29-Jul-05 8:15

hey thanks for the answer

if (strchr(szBuffer,EOF_Char))<br />
						fContinue = false;

I think the problem is, that this never happens.

so it gets stuck in this while loop, where there is a function
lLastError = serial.WaitEvent();
but nothing happens here neither. how can interupt this loop?

thanks

Re: read from comport problem

Bob Stanneveld1-Aug-05 1:01

Bob Stanneveld

1-Aug-05 1:01

Hello,

I think your problem is that you wait forever for an event. So I guess that no event arrives on your COM port and that you are stuck in the WaitEvent() function.

See if this helps:

lLastError = serial.WaitEvent(NULL /* no overlapped IO */, 100 /* wait 100 ms */);
if( lLastError == ERROR_TIMEOUT )
{
    // no event arrived in the specified time interval
}

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Web Services from VC++ 6.0

carks28-Jul-05 8:21

carks

28-Jul-05 8:21

Hi All,

Ive got a project which was developed in Visual C++ version 6.0.

Now Ive got to make it access a web service to get data from a database...

First of all im COMPLETELY ignorant on these matters, but i suppose we've all got to take the plunge sometime...

I know that in the Visual Studio .NET version there are some tools to "automatically" generate the volumes of code required to do the web service method accessing stuff, but I dont want to change to .NET just to do this little thing!

Is there a simple generalized web service accessing API which wraps all the crap required to access a web service into a few simple routines?

Ive been looking around the net but im not convinced that Ive found the perfect solution.

Thanks in advance for any pointers,

Dave

Re: Web Services from VC++ 6.0

fakefur28-Jul-05 10:05

fakefur

28-Jul-05 10:05

Search here on CP for an article by Anders Molin. It has a class that does exactly what you are looking for.

Re: Web Services from VC++ 6.0

Ravi Bhavnani28-Jul-05 10:16

Ravi Bhavnani

28-Jul-05 10:16

I wrote CWebResourceProvider[^] to solve exactly this kind of problem! You can find robust applications of this class here[^] and here[^].

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib@ravib.com

Help me... Rich Edit

Aqueel28-Jul-05 8:18

Aqueel

28-Jul-05 8:18

Now I am able to read data from a .rtf file and write its contents in a rich edit control. Now I want to include this .rtf file as a resourse (just like we include bitmap), to print its contents in a rich edit control. Please can anyone tell me how can i do that?

Thank you
Aqueel A. Mirza

We Believe in Excellence

Re: Help me... Rich Edit

John R. Shaw28-Jul-05 8:51

John R. Shaw

28-Jul-05 8:51

Goto the resource pane: right click on the on the root node of the list and select import.
OR
Insert->Resource->Import
OR
Ctrl+R

You should be able to figure out the rest from there.

Good Luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: Help me... Rich Edit

David Crow28-Jul-05 9:49

David Crow

28-Jul-05 9:49

Here is a somewhat related example.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.