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High Performance OPC UA Server SDK
1.2.0.193
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High Performance OPC UA Server SDK
1.2.0.193
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A table structure that is used to return Event fields to a Historical Read. More...
#include <historyevent.h>
Data Fields | |
| struct ua_historyeventfieldlist * | events |
| The list of Events being delivered. | |
| int32_t | num_events |
| Number of elements in ua_historyevent::events. | |
Related Functions | |
| void | ua_historyevent_init (struct ua_historyevent *t) |
| Initialize an ua_historyevent struct with a valid value. More... | |
| void | ua_historyevent_clear (struct ua_historyevent *t) |
| Clear all resources alloctated in an ua_historyevent struct. More... | |
| int | ua_historyevent_compare (const struct ua_historyevent *a, const struct ua_historyevent *b) |
| Compare two ua_historyevent structs. More... | |
| int | ua_historyevent_copy (struct ua_historyevent *dst, const struct ua_historyevent *src) |
| Create a copy of a ua_historyevent struct. More... | |
| static int | ua_historyevent_resize_events_array (struct ua_historyevent *val, int32_t new_len) |
| Resize the events array of a ua_historyevent struct. More... | |
A table structure that is used to return Event fields to a Historical Read.
The structure is in the form of a table consisting of one or more Events, each containing an array of one or more fields. The selection and order of the fields returned for each Event is identical to the selected parameter of the EventFilter.
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Clear all resources alloctated in an ua_historyevent struct.
Frees allocated memory like arrays and resets numeric values. The ua_historyevent struct itself is not freed and must be freed by the caller if required. This function always succeeds for a valid ua_historyevent struct, that was validly decoded, initilized by ua_historyevent_init or created with ua_historyevent_copy.
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Compare two ua_historyevent structs.
Compares the content of the ua_historyevent struct a to the content of the ua_historyevent struct b. If a is smaller than b, an integer less than zero is returned, if a is bigger than b, an integer greater than zero is returned. If both structs are equal zero is returned.
This function creates a total order on ua_historyevent structs, so it is well suited to not only determine equality, but also sort multiple instances of this struct.
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Create a copy of a ua_historyevent struct.
Copy all fields from struct ua_historyevent src to dst. Creates a deep copy so all content is recusively copied and both src and dst can be used and must be freed separately.
dst is not cleared before the copy operation, so it must not have any allocated data. It may or may not be initilized by the caller before copy.
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Initialize an ua_historyevent struct with a valid value.
After initialization the fields of the struct are set to valid and consistent values and can safley be accessed. An initialized ua_historyevent struct can also be passed to ua_historyevent_compare, ua_historyevent_copy and ua_historyevent_clear. This function will always succeed as long as an ua_historyevent struct is passed to it.
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Resize the events array of a ua_historyevent struct.
Depending on new_len and the current size of the array, the array will be created, increased, decreased or deleted. In case array members are removed these are cleared properly, new array members are initialized with zero.
| new_len | New length of the events array in number of members. |