|
|
 |
DELPHI常用函数集及简要范例 |
热 ★★★★ |
|
DELPHI常用函数集及简要范例 |
|
作者：闵涛 文章来源：闵涛的学习笔记 点击数：19859 更新时间：2009/4/23 18:30:33  |
|
|
p;''''Today is '''' + DateToStr(Date);
end;
# Date, DateToStr Example
--------------------------------------------------------
DayOfWeek 求叁数日期是星期几.
--------------------------------------------------------
Unit SysUtils
函数原型 function DayOfWeek(Date: TDateTime): Integer;
说明 传回值是一整数,1~7.
星期日为1.
范例
procedure TForm1.Button1Click(Sender: TObject);
var
ADate: TDateTime;
days: array[1..7] of string;
begin
days[1] := ''''Sunday'''';
days[2] := ''''Monday'''';
days[3] := ''''Tuesday'''';
days[4] := ''''Wednesday'''';
days[5] := ''''Thursday'''';
days[6] := ''''Friday'''';
days[7] := ''''Saturday'''';
ADate := StrToDate(Edit1.Text);
ShowMessage(Edit1.Text + '''' is a '''' + days[DayOfWeek(ADate)];
end;
# StrToDate, DayOfWeek Example
--------------------------------------------------------
DecodeDate 将TDateTime型态的日期变数，转为Word型态.
--------------------------------------------------------
范例
procedure TForm1.Button1Click(Sender: TObject);
var
Present: TDateTime;
Year, Month, Day, Hour, Min, Sec, MSec: Word;
begin
Present:= Now;
DecodeDate(Present, Year, Month, Day);
Label1.Caption := ''''Today is Day '''' + IntToStr(Day) + '''' of Month ''''
+ IntToStr(Month) + '''' of Year '''' + IntToStr(Year);
DecodeTime(Present, Hour, Min, Sec, MSec);
Label2.Caption := ''''The time is Minute '''' + IntToStr(Min) + '''' of Hour ''''
+ IntToStr(Hour);
end;
# DecodeDate, DecodeTime Example
--------------------------------------------------------
DecodeTime 将TDateTime型态的时间变数，转为Word型态.
--------------------------------------------------------
Unit SysUtils
函数原型 procedure DecodeDate(Date: TDateTime; var Year, Month,Day: Word);
函数原型 procedure DecodeTime(Time: TDateTime; var Hour, Min, Sec,MSec: Word);
范例 procedure TForm1.Button1Click(Sender: TObject);
var
Present: TDateTime;
Year, Month, Day, Hour, Min, Sec, MSec: Word;
begin
Present:= Now;
DecodeDate(Present, Year, Month, Day);
Label1.Caption := ''''Today is Day '''' + IntToStr(Day) + '''' of
Month '''' + IntToStr(Month) + '''' of Year '''' + IntToStr(Year);
DecodeTime(Present, Hour, Min, Sec, MSec);
Label2.Caption := ''''The time is Minute '''' +IntToStr(Min) + '''' of
Hour '''' + IntToStr(Hour);
end;
--------------------------------------------------------
EncodeDate 将Word型态的日期变数，转为TDateTime型态.
--------------------------------------------------------
范例
procedure TForm1.Button1Click(Sender: TObject);
var
MyDate: TDateTime;
begin
MyDate := EncodeDate(StrToInt(Edit1.Text), StrToInt(Edit2.Text), StrToInt(Edit3.Text));
Label1.Caption := DateToStr(MyDate);
end;
-------------------------------------------------------
EncodeTime 将Word型态的时间变数，转为TDateTime型态.
--------------------------------------------------------
Unit SysUtils
函数原型 function EncodeDate(Year, Month, Day: Word): TDateTime;
函数原型 function EncodeTime(Hour, Min, Sec, MSec: Word):
TDateTime;
范例 procedure TForm1.Button1Click(Sender: TObject);
var
MyDate: TDateTime;
MyTime: TDateTime;
begin
MyDate := EncodeDate(83, 12, 31);
Label1.Caption := DateToStr(MyDate);
MyTime := EncodeTime(0, 45, 45, 7);
Label2.Caption := TimeToStr(MyTime);
end;
范例
procedure TForm1.Button1Click(Sender: TObject);
var
MyTime: TDateTime;
begin
MyTime := EncodeTime(0, 45, 45, 7);
Label1.Caption := TimeToStr(MyTime);
end;
--------------------------------------------------------
FormatDateTime 将日期时间依Format的格式转换给一字串.
--------------------------------------------------------
Unit SysUtils
函数原型 function FormatDateTime(const Format: string; DateTime:
TDateTime): string;
**** 类似DateTimeToString.
Format格式
c 内定值ShortDateFormat的格式.(1996/12/20 09:20:15 PM).
d 日期,前面不补0.(1-31)
dd 日期,前面补0.(01-31)
ddd 星期.(星期日).
Dddd 中文2.01版,同上.
ddddd 日期.(1996/12/20)
dddddd 日期.(1996年12月20日)
m 月份,前面不补0.(1-12)
mm 月份,前面补0.(01-12)
mmm 中文显示.(十二月)
mmmm 中文2.01版,同上.
Yy 年度.(00-99)
yyyy 年度.(0000-9999)
h 小时.(0-23)
hh 小时.(00-23)
n 分钟.(0-59)
nn 分钟.(00-59)
s 秒钟.(0-59)
ss 秒钟.(00-59)
t 时间.(09:20 PM)
tt 时间.(09:20:15 PM)
am/pm 单独显示am or pm.(若大写,则显示大写)
a/p 单独显示a or p.
范例
The following example assigns ''''The meeting is on Wednesday, February 15, 1995 at 10:30 AM'''' to the string variable S.
S := FormatDateTime(''''"The meeting is on " dddd, mmmm d, yyyy, " at " hh:mm AM/PM'''',
StrToDateTime(''''2/15/95 10:30am''''));//???
--------------------------------------------------------
Now 传回目前的日期时间.
--------------------------------------------------------
Unit SysUtils
函数原型 function Now: TDateTime;
范例
procedure TForm1.Button1Click(Sender: TObject);
begin
Label1.Caption := DateTimeToStr(Now);
end;
# Now, DateTimeToStr Example
--------------------------------------------------------
StrToDate 将字串转为TDateTime型态的日期.
--------------------------------------------------------
Unit SysUtils
函数原型 function StrToDate(const S: string): TDateTime;
范例 procedure TForm1.Button1Click(Sender: TObject);
var
ADate: TDateTime;
begin
ADate := StrToDate(Edit1.Text);
Label1.Caption := DateToStr(ADate);
end;
范例
procedure TForm1.Button1Click(Sender: TObject);
var
ADate: TDateTime;
days: array[1..7] of string;
begin
days[1] := ''''Sunday'''';
days[2] := ''''Monday'''';
days[3] := ''''Tuesday'''';
days[4] := ''''Wednesday'''';
days[5] := ''''Thursday'''';
days[6] := ''''Friday'''';
days[7] := ''''Saturday'''';
ADate := StrToDate(Edit1.Text);
ShowMessage(Edit1.Text + '''' is a '''' + days[DayOfWeek(ADate)];
end;
# StrToDate, DayOfWeek Example
--------------------------------------------------------
StrToDateTime 将字串转为TDateTime型态的日期时间.
--------------------------------------------------------
Unit SysUtils
函数原型 function StrToDateTime(const S: string): TDateTime;
范例
procedure TForm1.Button1Click(Sender: TObject);
var
ADateAndTime: TDateTime;
begin
ADateAndTime := StrToDateTime(Edit1.Text);
Table1.FieldByName(''''TimeStamp'''').AsDateTime := ADateAndTime;
end;
--------------------------------------------------------
StrToTime 将字串转为TDateTime型态的时间.
--------------------------------------------------------
Unit SysUtils
函数原型 function StrToTime(const S: string): TDateTime;
范例
procedure&n上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >>
没有相关教程
|
|
| 教程录入：mintao 责任编辑：mintao |
|
|
上一篇教程： Delphi中预想不到的代码
下一篇教程： Delphi数据库的动态建立 |
|
|
| 【字体：小 大】【发表评论】【加入收藏】【告诉好友】【打印此文】【关闭窗口】 |
|
 注：本站部分文章源于互联网，版权归原作者所有！如有侵权，请原作者与本站联系，本站将立即删除！ 本站文章除特别注明外均可转载，但需注明出处！ [MinTao学以致用网] |
| 网友评论：（只显示最新10条。评论内容只代表网友观点，与本站立场无关！） |
| |
|
|
|
|
|
 |
同类栏目 |
 |
|
赞助链接 |
|
|
500 - 内部服务器错误。
|
|
|
|
|
|
