Delphi 키워드 자세히 1
18227 단어 Delphi
absolute
// , .
var
Str: string[32];
StrLen: Byte absolute Str;
// StrLen Str .
// 0 , StrLen .
begin
Str := 'abc';
Edit1.Text := IntToStr(StrLen);
end;abstract
// , .
//Abstract Virtual Dynamic , .
// , .
type
TDemo = class
private
protected
procedure X; virtual; abstract;
public
constructor Create;
destructor Destroy; override;
published
end;and
// 、
if (a>0) and (b>0) then
// 、
var
a,b,c: Integer;
begin
c := (a and b);
end;
// And , And , .
// :
if a>0 and b>0 then
// :
if a>(0 and b)>0 then
// :
if (a>0) and (b>0) then
// , , .
// a>b>c , Delphi .
// And , .
// , And .array
//Array , . ２ .
//
var
Arr1: array [1..10] of Integer;
// , , SetLength
var
Arr2: array of Integer;
// , , , Length
function X(A: array of Integer): Integer;
var
i: Integer;
begin
Result := 0;
for i := 0 to Length(A)-1 do
Result := Result + A[i];
end;as
//As
procedure BtnClick(Sender:TObject);
begin
(Sender as TButton).Caption := 'Clicked';
end;
// , As
(HTTPRIO as IExp).GetConnection;
//As , :
var
i: Integer;
s: string;
begin
s := (i as string);
end;
// :
s := string(i);asm
//Asm , , asm...end; , begin...end;
function IntToHex(Value: Integer; Digits: Integer): string;
asm
CMP EDX, 32
JBE @A1
xor EDX, EDX
@A1: PUSH ESI
MOV ESI, ESP
SUB ESP, 32
PUSH ECX
MOV ECX, 16
CALL CvtInt
MOV EDX, ESI
POP EAX
CALL System.@LStrFromPCharLen
ADD ESP, 32
POP ESI
end;assembler
//Assembler , 80386 .
// Asm :Asm Win32 , Assembler 80x86 , Invoke .
function IntToHex(AValue: Int64): string; assembler;automated
//Automated , .
//ComObj Automated .
type
TDemo = class
automated
Str:WideString;
end;
// , Str ,
type
TDemo = class
automated
Str: AnsiString;
end
// Str WideString , AnsiString.
// , , automated .begin
//begin , end .
procedure X;
begin
ShowMessage('A Demo');
end;
// , If, For, While begin
for i:=1 to 100 do
begin
sum := sum + i;
if sum > 1000 then Break;
end;case
//Case , Case , , , .
//Case end , , else .
function GetDays(AYear,AMonth: Integer): Integer;
begin
case AMonth of
1,3,5,7,8,10,12: Result := 31;
4,6,9,11: Result := 30;
2: begin
if IsLeapYear(AYear) then
Result:=29
else
Result:=28;
end;
else
Result:=0;
end;cdecl
//Cdecl , C C++ DLL .
// C C++ Delphi .
// C++ :
int X(int i)
{
return i*2;
}// Demo.dll , Delphi :
function X(i: Integer): Integer; Cdecl; external 'Demo.dll';class
//Class , .
// , Class , .
type
ClassDemo = class(TObject)
private
public
constructor Create;
end;
// class , , :
type
ClassA = class
private
public
procedure Y;
end;
type
ClassB = class(ClassA)
private
public
class procedure X;
end;
// ClassA ClassB X
procedure ClassA.Y;
begin
Self.X;
end;
// class .const
//Const , const .
// , const .
const MyFileName = 'Delphi';
const MyInteger = 100;
// Const , , .
// const
function X(const i: Integer): string;
// , i .constructor
//constructor , ,
// Create , Create CreateWnd .
type
ClassDemo = class(TObject)
private
fValue: Integer;
public
constructor Create;
end;
constructor ClassDemo.Create;
begin
fValue := 0;
end;contains
//Contains (Package) .
// Contains , .
package DATAX;
requires
rtl, clx;
contains
Db, DBLocal, DBXpress;
end.default
//Default
// , .
type
ClassDemo = class
private
fValue: Integer;
published
property Value: Integer read fValue write fValue default 0;
end;
//
property strings[Index: Integer]: string read GetString write PutString; Default;destructor
//Destructor , .
// , . Destroy .
type
ClassDemo = class(TComponent)
public
destructor Destroy;override;
end;
// TComponent Destroy ,
// , , :
destructor Destroy; overload;dispid
//DispId DispInterface , .
// DispInterface , ,
// DispId, .
// DispInterface .
type
IStringsDisp = dispinterface
['{EE05DFE2-5549-11D0-9EA9-0020AF3D82DA}']
property ControlDefault[Index: Integer]: Olevariant dispid 0; default;
function Count: Integer; dispid 1;
property Item[Index: Integer]: Olevariant dispid 2;
procedure Remove(Index: Integer); dispid 3;
procedure Clear; dispid 4;
function Add(Item: Olevariant): Integer; dispid 5;
function _NewEnum: IUnknown; dispid -4;
end;dispinterface
//DispInterface , .
// DispInterface , .
//DispInterface , .
// DispId .
//DispInterface Windows , Linux , .
// , DispInterface.
// DispIddiv
//Div . Div , .
var
a,b,c:Integer;
begin
a := 20; b := 3;
c := a div b; {6}
end;do
//Do For, While, On, With ,
//For :
for i := 1 to 100 do sum:=sum+i;
//While :
while i < 100 do
begin
sum := sum + i;
Inc(i);
end;
//On ( ):
try
i := StrToInt(s);
except
on exception do ShowMessage('Error!');
end;
//With :
with Memo1.Lines do
begin
Clear;
Append('abc');
Append('123');
end;downto
//DownTo For , .
for i := 100 downto 1 do
ListBox1.Items.Add(IntToStr(i));
// For , To , DownTo .dynamic
//Dynamic ,
// , ( Virtual).
procedure X(i: Integer); dynamic;else
//else , If, Case On , , else
//If ( If , else ):
if a > b then
c := a
else
c:=b;
//Case :
case Tag Of
1:Result:=1;
2:Result:=2;
3:Result:=3;
else
Result:=0;
end;
//On ( ):
try
i := StrToInt(s);
Excpet
on EZeroDivide do Result := 1;
on EOverflow do Result := 2;
else
Result := 0;
end;end
//End .
// begin, Case, Class, Interface, Asm, Unit, Package .
// ( ), End .
// ( ), end .
// If else End .
procedure X;
begin
with Button1 do
begin
if Button1.ShowHint then
Button1.Caption := 'Hinted'
else
Button1.Caption := 'Not Hinted';
end;
end;
// End :
package DATAX;
requires
rtl,
clx;
contains Db, DBLocal, DBXpress;
end.except
//except , try , , except
try
i := StrToInt(s);
except
ShowMessage('Error!');
end;export
//Export , , .
// dll . .
function Add(a,b: Integer): Integer; export;
// Demo.exe, ,
function Add(a,b: Integer): Integer; stdcall; external 'Demo.exe';exports
//exports , , , .
library Demo;
function X(i: Integer): string; stdcall;
begin
Result:=IntToStr(i);
end;
exports
X;
begin
end.
// , , .
library Demo;
function X(i: Integer): string; overload; stdcall;
begin
Result := IntToStr(i);
end;
function X(s: string): Integer; overload; stdcall;
begin
Result := StrToInt(s);
end;
exports
X(i: Integer) name 'x1',
X(s: string) name 'x2';
begin
end.external
//External OBJ .
{$L Demo.OBJ}
procedure X(i:Integer);external;
// dll , :
function A(FileName: string): string; external 'Demo.dll';
// , .
function A(Name: string): string; overload; stdcall; external 'Demo.dll' name 'A1';
function A(Code: Integer): string; overload; stdcall; external 'Demo.dll' name 'A2';
// External , , .far
//Far , .
// dll . .
function Add(a,b: Integer): Integer; Far;
// Demo.exe, , :
function Add(a,b: Integer): Integer; stdcall; external 'Demo.exe';file
//File , File,
// File Of , .
type
TPerson = record
PName: string[32];
PAge: Integer;
end;
var
PFile: file of TPerson;finalization
//finalization ,
// , .
//finalization OLE .
initialization
ActiveX.OleInitialize(nil);
finalization
ActiveX.OleUninitialize;finally
//finally ,
// , finally try .
try
Node := Node.GetNext;
Edit1.Text := Node.Text;
finally
Node := nil;
end;for
//For For , .
for i := 1 to 100 do sum := sum + i;
// , DownTo
for i := 100 downto 1 do Inc(sum);forward
//Forward . , .
// , , .
function X(i: Integer): Integer; forward;
procedure Y(s: string); forward;
...
function X;
begin
Result := i * 2;
end;
procedure Y;
begin
WriteLn(s);
end;
// Forward , .function
//Function
function X(i: Integer): Integer;
//
type
TFun = function(i: Integer): Integer of object;
// , , , .goto
//Goto , .
// label .
// Goto , .
var
a,b: Integer;
label
X,Y;
begin
if a > b then
goto X
else
goto Y;
X:
WriteLn('a > b');
Y:
WriteLn('b > a');
end;if
//If If , .
var
a,b: Integer;
begin
a := 2; b := 3;
if a>b then
WriteLn('a=' + IntToStr(a))
else
WriteLn('b=' + IntToStr(b));
end;
//If If...Then...else, else .
// If , begin...End .
if a > b then
begin
WriteLn('a>b');
WriteLn('a=' + IntToStr(a));
WriteLn('b=' + IntToStr(b));
End
else
WriteLn('b>a');implementation
//Implementation , :
//Unit...Interface...implementation...end.
// , implementation .
// implementation , , .
implementation
uses frmAbout;
begin
FormAbout.Show;
end;
// implementation .implements
//Implements , .
// , .
type
IMyInterface = interface
procedure P1;
procedure P2;
end;
TMyImplclass = class
procedure P1;
procedure P2;
end;
TMyclass = class(TInterfacedObject, IMyInterface)
FMyImplClass: TMyImplClass;
property MyImplClass: TMyImplclass read FMyImplclass implements IMyInterface;
procedure IMyInterface.P1 = MyP1;
procedure MyP1;
end;
// implements , , :
procedure IMyInterface.P1 = MyP1;이 내용에 흥미가 있습니까?
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