3、动态数组(dynamic array) 动态数组是一种在运行时分配内存的数组,一个动态数组可以变大,也可以变小。 声明一个动态数组,只要在声明时不要制定维数,就像这样: 1 2 3 4 5 6 7 8 9 10 var SA: array of string; { 一维动态数组} begin { 使用SetLength进行动态数组的空间分配,已有元素可以得到保留} ...
singleArray : array of string; multiArray : array of array of Word; i, j : Integer; begin // Set the length of a single dimension array SetLength(singleArray, 4); // Now fill it up : note that dynamic arrays start at 0 ShowMessage('Single dimensional array :'); for i := 0 to...
动态方法dynamic、抽象方法abstract、覆盖override和重载overload的方法、处理消息的方法message 消息常量。 虚拟方法:用空间换时间,较快 动态方法:时间换空间,较慢 抽象方法:前缀必须是虚拟方法或动态方法,只需声明不用定义 Tobject.destroy 是虚拟的 属性成员:反映数据(域)的窗口,对数据处理。包括数据属性和事件属性。
Elements of the array are values that are all of the same type (string, integer, record, custom object). In Delphi, there are two types of arrays: a fixed-size array which always remains the same size--a static array--and a dynamic array whose size can change at runtime. Static Arr...
1 {动态数组} 2 type 3 StringArray = array of string; 4 var 5 NArray : StringArray; 6 NameArray1 : StringArray; 7 Indexs1 : Integer; 8 Elem1 : string; 9 10 procedure Dynamic_MyProc1; 11 begin 12 SetLength(NArray,20); //设置长度,并未创建元素 13 14 NameArray1 := StringArray...
Letters = set of Char; var Name: string; begin { long comment and long statement, going on in the following line and indented two spaces } MessageDlg ('This is a message', mtInformation, [mbOk], 0); 提出以上代码编写格式只是向你建个议而已,这样代码能更加易读,其实代码格式并不影响编译结果...
type TIdentifier = array[0..15] of Char; TFileName = array[0..259] of Char; TMemoText = array[0..1023] of WideChar; With extended syntax enabled ({$X+}), you can assign a string constant to a statically allocated zero-based character array. (Dynamic arrays won't work for this...
指针也是变量.但其中不存储数值或字符,而是一个内存存储单元的地址.如果将内存看做是一个大数组,指针可以看做是这个数组中的一个入口,指向数组中另一个数组的入口索引.( If you see memory as an array,a pointer can be seen as an entry in the array which contains the index of another entry in the...
function Two(const value : integer) : string; //函数-实例2 begin result := IntToStr(2 * value) ; end; 定义将要使用动态函数指针参数的函数 function DynamicFunction(f : TFunctionParameter; const value : integer) : string; begin result := f(value) ; ...
Note:Use of such constructs is discouraged. You can free a variant by setting it toUnassignedand an interface or dynamic array by setting it tonil. See Also About Data Types (Delphi) Simple Types (Delphi) String Types (Delphi) Structured Types (Delphi) ...