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arrays_20of_20structures_20_28lbb_29
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arrays_20of_20structures_20_28lbb_29 [2018/03/31 13:19] 127.0.0.1 external edit |
arrays_20of_20structures_20_28lbb_29 [2018/04/17 15:10] (current) tbest3112 Added syntax highlighting |
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| //by Richard Russell, December 2014//\\ \\ One of the language extensions provided by [[http://www.lbbooster.com/|LB Booster]] is native **arrays of structures**. These can be useful for structured data storage within a program, or when calling a Windows API function (for example [[http://msdn.microsoft.com/en-us/library/windows/desktop/dd162814.aspx|Polygon]]) which requires an array of structures as one of its parameters.\\ \\ The syntax for declaring an array of structures is very similar to that for declaring a single structure; the only difference is the addition of the dimension(s) in parentheses:\\ | //by Richard Russell, December 2014//\\ \\ One of the language extensions provided by [[http://www.lbbooster.com/|LB Booster]] is native **arrays of structures**. These can be useful for structured data storage within a program, or when calling a Windows API function (for example [[http://msdn.microsoft.com/en-us/library/windows/desktop/dd162814.aspx|Polygon]]) which requires an array of structures as one of its parameters.\\ \\ The syntax for declaring an array of structures is very similar to that for declaring a single structure; the only difference is the addition of the dimension(s) in parentheses:\\ | ||
| + | <code lb> | ||
| STRUCT sname(dims), member1 AS type, member2 AS type... | STRUCT sname(dims), member1 AS type, member2 AS type... | ||
| + | </code> | ||
| Arrays of structures may have any number of dimensions, limited only by available memory. As with ordinary numeric and string arrays the index value runs from 0 to the specified maximum dimension.\\ \\ Accessing an individual member, in order to change or read its value, again uses a syntax very similar to that used for a single (scalar) structure:\\ | Arrays of structures may have any number of dimensions, limited only by available memory. As with ordinary numeric and string arrays the index value runs from 0 to the specified maximum dimension.\\ \\ Accessing an individual member, in order to change or read its value, again uses a syntax very similar to that used for a single (scalar) structure:\\ | ||
| + | <code lb> | ||
| sname(index).member.struct = newvalue | sname(index).member.struct = newvalue | ||
| PRINT sname(index).member.struct | PRINT sname(index).member.struct | ||
| + | </code> | ||
| \\ To pass the entire array of structures as a parameter to an API function use the following syntax:\\ | \\ To pass the entire array of structures as a parameter to an API function use the following syntax:\\ | ||
| + | <code lb> | ||
| sname() AS struct | sname() AS struct | ||
| + | </code> | ||
| Note the use of a pair of parentheses with nothing in between.\\ \\ Here are a couple of examples of the use of arrays of structures. Firstly an adaptation of the program by Dennis McKinney at the [[http://lbpe.wikispaces.com/ArraysAndStructs|Lliberty BASIC Programmer's Encyclopedia]]:\\ | Note the use of a pair of parentheses with nothing in between.\\ \\ Here are a couple of examples of the use of arrays of structures. Firstly an adaptation of the program by Dennis McKinney at the [[http://lbpe.wikispaces.com/ArraysAndStructs|Lliberty BASIC Programmer's Encyclopedia]]:\\ | ||
| + | <code lb> | ||
| 'define array of 100 structures | 'define array of 100 structures | ||
| struct test(99),_ | struct test(99),_ | ||
| Line 44: | Line 51: | ||
| [quit] | [quit] | ||
| end | end | ||
| + | </code> | ||
| \\ Secondly, an example of passing an array of structures to an API function:\\ | \\ Secondly, an example of passing an array of structures to an API function:\\ | ||
| + | <code lb> | ||
| nomainwin | nomainwin | ||
| open "Structure array" for graphics as #w | open "Structure array" for graphics as #w | ||
| Line 64: | Line 73: | ||
| close #w | close #w | ||
| end | end | ||
| + | </code> | ||
arrays_20of_20structures_20_28lbb_29.txt ยท Last modified: 2018/04/17 15:10 by tbest3112
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