Chapter 4 Programming Issues for CINs

Support Manager

The support manager is a collection of constants, macros, basic data types, and functions that perform operations on strings and numbers. The support manager also has functions for determining the current time in a variety of formats.

The string functions contain much of the functionality of the string libraries supplied with standard C compilers, such as string concatenation and formatting. You can use variations of many of these functions with LabVIEW strings (4-byte length field followed by data, generally stored in a handle), Pascal strings (1-byte length field followed by data), and

C strings (data terminated by a null character).

With the utility functions you can sort and search on arbitrary data types, using quicksort and binary search algorithms.

The support manager also contains transcendental functions for many complex and extended floating-point operations.

Certain routines specify time as a data structure using the following form.

typedef struct {

int32	sec;/* 0:59 */
int32	min;/* 0:59 */
int32	hour;/* 0:23 */
int32	mday;/* day of the month, 1:31 */
int32	mon;/* month of the year, 1:12 */
int32	year;/* year, 1904:2040 */
int32	wday;/* day of the week, 1:7 for Sun:Sat */
int32	yday;/* day of year (julian date), 1:366 */
int32	isdst;/* 1 if daylight savings time */
} DateRec;

Using External Code in LabVIEW

4-36

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