Implement callbacks

About this task

In the C Library integration, you will implement most callbacks based on a defined signature.

This includes:

initialization_CB
library_shutdown_CB
register_pos_CB
register_ped_CB
create_new_tender_CB
library_exception_CB
cancel_or_refund_CB
show_screen_CB
tx_store_CB

We have defined a signature for each callback. The signature we provide looks like:

void initialization_CB(void * result, void * echo_pointer);

You will need to implement callback functions with the same signature.

The process differs for callbacks that are added to the register_device_request structure and passed with the register_ped call. For these callbacks, see .

Steps

To use these callbacks:

Implement the callback with the same signature. In the following example we will implement the intitialization_CB callback.

void initialization_CB(void * result, void * echo_struct){

    app_context_t * sPOS = (app_context_t *)echo_struct;

    sPOS->pending_callback = 0;      //mark handled

}

Pass intitialization_CB as a parameter of the init_library call.

ADYLibraryResult result = init_library(initReq, initialization_CB, sPOS);