delphi±ÊÊÔÌâ(Ò»)
1¡¢ÇëÁоÙVCLÀà¿âÖÐÒÔTObjectΪ¸ùµÄ¶ÔÏóÌåϵ£¨¿ÉÒÔÖ»ÀàÖ÷¸É£©
2¡¢ÇëÁоÙVCLÊý¾Ý¿â·½ÃæµÄºËÐÄÀà
3¡¢DelphiÖÐoverrideºÍoverloadµÄ×÷Ó÷ֱðÊÇʲô£¿
4¡¢DelphiÖÐRTTIÊÇʲô£¿ÓÐʲô×÷Óã¿
5¡¢Èç¹ûÒ»¸ö¸Õ²¿ÊðµÄWeb·þÎñÆ÷²»ÄÜ·ÃÎÊ£¬Áоٳö¿ÉÄÜ´æÔÚµÄÔÒò£¿
6¡¢ÔÚSQLÖÐ×óÁ¬½Óʱʲô?ËüÄÜʵÏÖµÄÊý¾Ý½á¹û¼¯µÄÌØµãÊÇʲô£¿
7¡¢ÇëÎÊÔÚOracleºÍMssqlÖÐÈçºÎֻȡselectÓï¾ä½á¹û¼¯ÖеÄǰ100Ìõ£¿
Oracle£ºselect top 100 * from tablename
Mssql£ºselect * from tablename where rownum < 101
8¡¢¶þ²æÊ÷
type
TBTreeNode = class
Data: string;
Left: TBTreeNode;
Right: TBTreeNode;
end;
function NewNode(const Data: string; Left, Right: TBTreeNode): TBTreeNode;
begin
Result := TBTreeNode.Create;
Result.Data := Data;
Result.Left := Left;
Result.Right := Right;
end;
var Root: TBTreeNode;
procedure Init;
begin
{ ½¨Ê÷£º
=
X *
+ -
1 2 3 4
}
Root = NewNode('=', NewNode('X', nil, nil),
NewNode('*', NewNode('+', NewNode('1', nil, nil), NewNode('2', nil, nil)),
NewNode('-', NewNode('3', nil, nil), NewNode('4', nil, nil))));
end;
¼ÙÉè±äÁ¿RootÒѾÓÐInit³õʼ»¯£¬Çëд³öÖÐÐò±éÀúRootÊ÷µÄ´úÂ룬ҪÇóÊä³ö½á¹ûX=1+2*3-4
9¡¢Á½ÖÖÊý¾Ý¿â½á¹¹±í¼°²¿·Ö¼Ç¼ÈçÏ£º
±àÂëÊ÷£º
—————————
ID
01
0102
0103
010204
—————————
¸¸×ÓÊ÷£º
—————&mda
Ïà¹ØÎĵµ£º
Delphi µÄ×Ö·û¼°×Ö·û´®[1] - string¡¢AnsiString¡¢WideString¡¢String[n]¡¢ShortString
2008-10-17 14:57:17
//×î³£ÓÃµÄ string
var
str: string; {¶¨Òå}
begin
str := 'ÍòÒ»'; {¸³Öµ}
ShowMessage(IntToStr(Length(str))); {³¤¶ÈÊÇ: 4}
end;
//³¤×Ö·û´® AnsiString; ÔÚµ±Ç°°æ± ......
Ãû³Æ ÀàÐÍ ËµÃ÷
abort º¯Êý ÒýÆð·ÅÆúµÄÒâÍâ´¦Àí
abs º¯Êý ¾ø¶ÔÖµº¯Êý
addexitproc º¯Êý ½«Ò»¹ý³ÌÌí¼Óµ½ÔËÐÐʱ¿âµÄ½áÊø¹ý³Ì±íÖÐ
addr º¯Êý ·µ»ØÖ¸¶¨¶ÔÏóµÄµØÖ·
adjustlinebreaks º¯Êý ½«¸ø¶¨×Ö·û´®µÄÐзָô·ûµ÷ÕûΪcr/lfÐòÁÐ
align Êô ......
{ º¯Êý : RESULTSTRING = HexToBin(HEXSTRING)
{ Ä¿µÄ : °ÑÊ®Áù½øÖÆ×Ö·û´®×ª»»Îª¶þ½øÖÆ×Ö·û´®
{
{===============================================================}
{ º¯Êý : RESULTINTEGER = HexCharToInt(HEXCHAR)
{ Ä¿µÄ : ת»»Ò»¸öÊ®Áù½øÖÆ×Ö·ûΪÕûÊý
{==================================================== ......
Delphi Óë C/C++ Êý¾ÝÀàÐͶÔÕÕ±í
DelphiÊý¾ÝÀàÐÍC/C++
ShorInt
8λÓзûºÅÕûÊý
char
Byte
8λÎÞ·ûºÅÕûÊý
BYTE,unsigned short
SmallInt
16λÓзûºÅÕûÊý
short
Word
16λÎÞ·ûºÅÕûÊý
unsigned short
Integer,LongInt
32λÓзûºÅÕûÊý
int,long
Cardinal,LongWord/DWORD
32λÎÞ·ûºÅÕûÊý
unsigned long
Int6 ......