- #DELPHI XE10 PACKED RECORD CREATE DISPOSE FULL#
- #DELPHI XE10 PACKED RECORD CREATE DISPOSE CODE#
- #DELPHI XE10 PACKED RECORD CREATE DISPOSE WINDOWS#
we must use an array type to avoid the array being treated IMPORTANT - note that the array type must not be defined here. Procedure that updates a dynamic array size Pass a number of characters as an open constant array to a subroutine Pass this predefined array as an open array to a subroutine Pass the undefined array as a dynamic array to a subroutine
#DELPHI XE10 PACKED RECORD CREATE DISPOSE CODE#
ShowMessage('multiArray = '+Įxample code : Using open arrays as parameters Set and show all elements of this array Set the length of the 3 sub-arrays to different sizes Set the length of the 1st dimension of the multi-dim array ShowMessage('byteArray element 4 = '+IntToStr(byteArray)) ShowMessage('byteArray element 2 = '+IntToStr(byteArray)) Furnish this array - remember that dynamic arrays start at 0 ShowMessage('byteArray highest element = '+IntToStr(High(byteArray))) ShowMessage('byteArray lowest element = '+IntToStr(Low(byteArray))) ShowMessage('byteArray length = '+IntToStr(Length(byteArray))) Set the length of the single dimension array MultiArray : Array of Array of string // Multi-dimension array ShowMessage('rangeArray element 20 = '+rangeArray) Įxample code : Declaring and using dynamic arraysīyteArray : Array of Byte // Single dimension array ShowMessage('rangeArray element 7 = '+rangeArray) Now use indexing to display 2 of the elements ShowMessage('wordArray Element 20 = '+IntToStr(wordArray)) ShowMessage('wordArray Element 7 = '+IntToStr(wordArray))
#DELPHI XE10 PACKED RECORD CREATE DISPOSE FULL#
The full range of a static array are available before assignment, ShowMessage('rangeArray highest element = '+IntToStr(High(rangeArray))) ShowMessage('rangeArray lowest element = '+IntToStr(Low(rangeArray))) ShowMessage('rangeArray length = '+IntToStr(Length(rangeArray))) ShowMessage('multiArray highest element = '+IntToStr(High(multiArray))) ShowMessage('multiArray lowest element = '+IntToStr(Low(multiArray))) ShowMessage('multiArray length = '+IntToStr(Length(multiArray))) ShowMessage('wordArray highest element = '+IntToStr(High(wordArray))) ShowMessage('wordArray lowest element = '+IntToStr(Low(wordArray))) ShowMessage('wordArray length = '+IntToStr(Length(wordArray))) Show the sizes and ranges of these arrays RangeArray : Array of string // Static array, size = 16 MultiArray : Array of char // Static array, 2 dimensions
WordArray : Array of Integer // Static, size=High(Word)
#DELPHI XE10 PACKED RECORD CREATE DISPOSE WINDOWS#
Returns the lowest value of a type or variableĬhanges the size of a string, or the size(s) of an arrayĬreates a slice of an array as an Open Array parameterĭownload this web site as a Windows program.Įxample code : Declaring and using static arrays Return the number of elements in an array or string Returns the highest value of a type or variable But be warned - it only copies the first, highest array dimension - the new array will still refer to elements of the subarrays.Ĭreate a copy of part of a string or an array In order to pass a Dynamic array by reference, the array and the subroutine definition of the array must be via an array type definition. This is called a Variant open array - it is mostly used to allow a variable number of argument value to be passed to a subroutine. Delphi passes the length as a hidden parameter to the subroutine.Īn open array may also be defined with const value type. Such an array is referred to as an Open array. If the array parameter definition has no range (ie, a dynamic array type), then you must, paradoxically pass a static array as a parameter. After one such SetLength operation, elements of the set array may be referenced, even though the rest of the array is undefined.īoth static and dynamic arrays may be passed to subroutines as parameters. Individual subarrays of a multidimensional dynamic array may have different sized dimensions - they are, of course, separate arrays. Sets the dynArray single dimension array size to 5 elements. Such arrays must have their length set before they can be used. For example, a Byte gives a 0.255 range.Īlternatively, the range of each dimension may be given by direct ordinal values, such as 22.44.ĭynamic arrays have no preallocated storage. The range of this type defines the dimension range. Where Index is an integer type, normally Byte or Word. The size of each dimension is determined in two ways, which may be freely mixed in a multidimensional array : The size and range of such a multidimensional array is always given for the highest, leftmost array - the parent array. They may be single or multidimensional - the latter being an array of arrays (of arrays etc). These are defined with fixed, unchangeable sizes. The Array keyword provides single and multi dimensional arrays (indexable sequences) of data. Type Name = array[ Index type| Ordinal.Ordinal const // Open variant array Delphi Basics : Array command Delphi BasicsĪ data type holding indexable collections of data