Error opening port in Symbian S60 3rd edition FP1

[gaurav.gupta]

Hi

I am trying to Read Write Data on Ports in Symbian S60 3RD EDITION FP1
BUT THE CODE LEAVE WITH ERROR CODE -4 WHEN I TRY TO OPEN THE PORT....
PLEASE HELP..
THANKS IN ADVANCE
GAURAV GUPTA

void CRWPorts::testPorts()
{
// KillFaxModemProcess();

_LIT(CSYMOD, "ECACM");
_LIT(KACMPort1, "ACM::1");
TInt ret = StartC32();

if ( ret != KErrNone && ret != KErrAlreadyExists )
{
console->Printf(_L("RET\n"));
User::Leave ( ret );
console->Printf(_L("after RET\n"));
}
RCommServ server;

User::LeaveIfError( server.Connect() );
// Load CSY Module

User::LeaveIfError( server.LoadCommModule( CSYMOD ) );

TBuf16<KMaxPortName> portName;
portName.Copy( KACMPort1 );
// Open the comm. port
RComm commPort;

User::LeaveIfError( commPort.Open( server, portName, ECommShared ) ); // CODE LEAVES HERE
// Verify capabilities of the port and configure it
TCommCaps portCaps;
commPort.Caps( portCaps );
if (((portCaps().iRate & KCapsBps115200) == 0) |
((portCaps().iDataBits & KCapsData8) == 0) |
((portCaps().iStopBits & KCapsStop1) == 0) |
((portCaps().iParity & KCapsParityNone) == 0))
{
User::Leave( KErrNotSupported );
}
TCommConfig portCfg;
commPort.Config( portCfg );
portCfg().iRate = EBps115200;
portCfg().iParity = EParityNone;
portCfg().iDataBits = EData8;
portCfg().iStopBits = EStop1;
portCfg().iHandshake = 0;
User::LeaveIfError( commPort.SetConfig( portCfg ) );
commPort.Write(aStatus,_L8("Hello World"));

console->Printf(_L("DAta sent"));
User::After(3000000);
TBuf8<20> iData;
commPort.ReadOneOrMore(aStatus,iData);
TBuf<20>iPrintData;
iPrintData.Copy(iData);
console->Printf(_L("data : %S"),&iPrintData);


}

[savaj]

I found your other similar thread. Please do not start multiple thread for same question.

http://discussion.forum.nokia.com/fo...d.php?t=164204

[gaurav.gupta]

hi savaj sir
Nobody gave me the solution on that thread so i thought that i should start a new one. could u please help on that...
thanks in advance
gaurav gupta

[savaj]

Socket server returns error -4 (KErrNoMemory) if there is any attempt to create a further connection through the socket server.

Read this article and check whether samething is happening with comms server???
http://wiki.forum.nokia.com/index.ph...cation_failure

[gaurav.gupta]

Hi all
i am able to open the port but when i write over it the code leaves..

thanks

Gaurav Gupta

TInt ret = StartC32();
if ( ret != KErrNone && ret != KErrAlreadyExists )
{
User::Leave ( ret );
}

TInt r=iCommServ.Connect();
if(r==KErrNone)
r=iCommServ.LoadCommModule(CSYMOD);
console->Printf(_L("r "));
// // OPEN
//
r= iCommPort.Open(iCommServ,_L("ACM::1"),ECommExclusive);

console->Printf(_L("Ready"));
console->Getch();
iCommPort.Write(iStatus,_L8("hello0000"));

[savaj]

What is the panic code??? Have you implemented active object???

[gaurav.gupta]

HI savaj sir

i have tried both way .
1 when i implement AO then there is no response ... application hangs
2 when i dont implement AO then code leaves
Plz help
regards
Gaurav Gupta

[savaj]

NO when i implement active objects then code does not leaves..but again there is no activity then,,,

Since RComm::Write() is asynchronous method, either you have to implement active object or use User::WaitForRequest(TRequestStatus &aStatus).

[gaurav.gupta]

HI savaj sir


but when i am writing on the port it is not going into RunL
where i hv written the code of reading the data ...
Plz help
regards
Gaurav Gupta

[gaurav.gupta]

Since RComm::Write() is asynchronous method, either you have to implement active object or use User::WaitForRequest(TRequestStatus &aStatus).

Sir As it is a asynchronous method .. then its RunL should be called as i am writing on data on port .. but nothing happens....

[bdonegan]

Hi,

Have you tried using User::WaitForRequest instead of an AO? This is a bit more straightforward, just for checking purposes.

Let us know what happens,

[gaurav.gupta]

hi bdonegan
no i have not tried User::waitforRequest.. as i have never used...
how should i do that ..
before writingto port...
for eg ...

User::WaitforRequest(iStatus);
iCommPort.Write(iStatus,_L8("hello0000"));

or where i am calling the function in which i am connecting to ports...

[bdonegan]

Just after you call the asynchronous function:

TRequestStatus status;
iCommPort.Write(status,_L8("hello0000");
User::WaitForRequest(status);

When it returns (if it does) you can check status.iInt for the error code. If it does return then you might not be using active objects correctly.

[gaurav.gupta]

hi
This is the code that i am using to write to ports:
but the moment it reaches write method code leaves ..
plz help....
Regards
Gaurav Gupta


_LIT(CSYMOD, "ECACM");
_LIT(KACMPort1, "ACM::1");

TInt ret = StartC32();
if ( ret != KErrNone && ret != KErrAlreadyExists )
{
User::Leave ( ret );
}

TInt r=iCommServ.Connect();
if(r==KErrNone)
r=iCommServ.LoadCommModule(CSYMOD);

r= iCommPort.Open(iCommServ,_L("ACM::1"),ECommExclusive);

TRequestStatus aStatus;
iCommPort.Write(aStatus,_L8("hello0000")); //code leaves here
User::WaitForRequest(aStatus);[/SIZE][/SIZE]

[ScrewSomeOne]

Hi gaurav,

Really good font size. Someone from 100 miles away can read your post, even i think blind man can also able to read your post. really good.

Regards,
S.