using PostDelayedCall how to get the value passed through void * callbackData?
Can someone tell me how to get the data passed through void * callbackData?
The following code, panel_ptr has the right address but still contains zero.
void CVICALLBACK value_changed (void * callbackData)
{
int * panel_ptr;
panel_ptr = callbackData;
calculate_new_value (* panel_ptr);
}
int sign;
Panel = 2;
PostDelayedCall (value_changed & Panel, 0.2);
The problem is using the callbackData parameter if it is a pointer, it must be a pointer to something which is still topical at the moment that the callback executes. That is to say, you cannot pass the pointer to a local variable in callbackData as when the callback executes the pointer is no longer valid. You can switch from its value, instead, in this way:
... SomeFunction)
{
int sign;
...
Panel = 2;
PostDelayedCall (value_changed, (void *) Panel, 0.2);
...
}
void CVICALLBACK value_changed (void * callbackData)
{
int panel_ptr;
panel_ptr = (int) callbackData;
calculate_new_value (panel_ptr);
return;
}
There are many discussions on the forums on callbackData parameter that you might want to read.
Tags: NI Software
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