Qt-interest Archive, July 2007
QSocketNotifier
Message 1 in thread
Hi,
we want to be notified about serial port receive events on a windows
plattform ( Windows XP SP2, Visual Studio 2003, QT 4.3.0 ).
we need the file handle for other classes, so we get the file descriptor
by using _open_osfhandle.
all is done without any error, but QSocketNotifier doesn't emit SIGNAL
activated if any data arrives.
is it a programming error or a windows problem?
thanks
Marko
the code fragment:
HANDLE m_fileHandle;
DCB m_config;
int m_fileDescriptor;
QSocketNotifier *m_socketNotifier;
//open device
m_fileHandle = CreateFileA( "COM1", GENERIC_READ|GENERIC_WRITE, 0,
NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING , NULL );
//config device - get current settings
m_config.DCBlength = sizeof( DCB );
GetCommState( m_fileHandle, &m_config );
//config device - edit settings
m_config.fBinary = true;
m_config.fAbortOnError = false;
m_config.fNull = false;
//config device - apply settings
SetCommState( m_fileHandle, &m_config );
//other initialisation for serial port ( baud rate a.s.o. )
//get filedescriptor
m_fileDescriptor = _open_osfhandle( reinterpret_cast<intptr_t>(
m_fileHandle ), _O_RDWR );
//create socketNotifier
m_socketNotifier = new QSocketNotifier( m_fileDescriptor,
QSocketNotifier::Read, this );
//connect
connect( m_socketNotifier, SIGNAL( activated( int ) ), this, SLOT(
canRead( int ) ) );
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[ signature omitted ]
Message 2 in thread
On Wednesday 04 July 2007 15:35:46 Marko Doering wrote:
> Hi,
>
> we want to be notified about serial port receive events on a windows
> plattform ( Windows XP SP2, Visual Studio 2003, QT 4.3.0 ).
> we need the file handle for other classes, so we get the file descriptor
> by using _open_osfhandle.
> all is done without any error, but QSocketNotifier doesn't emit SIGNAL
> activated if any data arrives.
>
> is it a programming error or a windows problem?
QSocketNotifier is implemented using the WinSock API, and I'm guessing that's
why you don't see any activity, since you are passing a handle that is not a
WinSock socket descriptor.
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[ signature omitted ]
