Help on callback function

[Ajay]

Hi all,
Can you please give a good example of callback function.I
tried on google Search but could not found the good one.I am working in
embedded system so giving example in the same context would be
helpful.thanks in advance.Ajay

 

[Ian Collins]

Hi all,
Can you please give a good example of callback function.I
tried on google Search but could not found the good one.I am working in
embedded system so giving example in the same context would be
helpful.thanks in advance.Ajay

Your embedded device might have a driver for an input device, that
driver might be wired to call a function provided by a higher layer when
it receives some data.

Something like:

void (*dataCallback)(const char*);

void registerDataCallback( void (*fn)(const char*) )
{
dataCallback = fn;
}

Then somewhere in the driver..

void passOnData(const char* data)
{
if( dataCallback )
{
dataCallback( data );
}
}