int vscphlp_isDataAvailable( long handle, 
                                unsigned int *pCount )
int pyvscphlp_isDataAvailable( handle, count )



Handle for the communication channel obtained from a call to vscphlp_newsession.

pCount (c/c++)

Pointer to variable that gets the number of events waiting in the queue on a successful call.

count (Python)

Variable that gets the number of events waiting in the queue on a successful call.

Return Value

Return VSCP_ERROR_SUCCESS on success, VSCP_ERROR_ERROR on failure. If the connection is closed VSCP_ERROR_CONNECTION is returned. VSCP_ERROR_PARAMETER is returned if called while in a receive loop.


Check the number of events (if any) that are available in the remote input queue.


// Check queue for events
if ( VSCP_ERROR_SUCCESS == (rv = vscphlp_isDataAvailable( handle2, &count ) ) ) {
     printf( "Command success: vscphlp_isDataAvailable on handle2\n" );
    printf( "count = %d\n", count );
        if ( 3 == count ) printf("Which is correct.\n");
else {
    printf("\aCommand error: vscphlp_isDataAvailable on channel 2  Error code=%d\n", rv);
print "Waiting for incoming data..."

cntAvailable = ctypes.c_uint(0)
while cntAvailable.value==0:
    print 'Still waiting...'

print '%d event(s) is available' % cntAvailable.value

for i in range(0,cntAvailable.value):
    ex = vscpEventEx()
    if VSCP_ERROR_SUCCESS == pyvscphlp_receiveEventEx(h1,ex):

Very Simple Control Protocol
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