◇[DELPHI]截获WM_QUERYENDSESSION关机消息
type
TForm1 = class(TForm)
procedure WMQueryEndSession(var Message: TWMQueryEndSession); message WM_QUERYENDSESSION;
procedure CMEraseBkgnd(var Message:TWMEraseBkgnd);Message WM_ERASEBKGND;
private
{ Private declarations }
public
{ Public declarations }
end;
procedure TForm1.WMQueryEndSession(var Message: TWMQueryEndSession);
begin
Showmessage(‘computer is about to shut down’);
end;
◇[DELPHI]得到硬盘序列号
var SerialNum : pdword; a, b : dword; Buffer : array [0..255] of char; begin if GetVolumeInformation(‘c:\’, Buffer, SizeOf(Buffer), SerialNum, a, b, nil, 0) then Label1.Caption := IntToStr(SerialNum^); end;
◇[DELPHI]MEMO的自动翻页
Procedure ScrollMemo(Memo : TMemo; Direction : char);
begin
case direction of
‘d’: begin
SendMessage(Memo.Handle, { HWND of the Memo Control }
WM_VSCROLL, { Windows Message }
SB_PAGEDOWN, { Scroll Command }
0) { Not Used }
end;
‘u’ : begin
SendMessage(Memo.Handle, { HWND of the Memo Control }
WM_VSCROLL, { Windows Message }
SB_PAGEUP, { Scroll Command }
0); { Not Used }
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ScrollMemo(Memo1,’d'); //上翻页
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ScrollMemo(Memo1,’u'); //下翻页
end;
◇[DELPHI]DBGrid中回车到下个位置(Tab键)
procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: Char); begin if Key = #13 then if DBGrid1.Columns.Grid.SelectedIndex < DBGrid1.Columns.Count – 1 then DBGrid1.Columns[DBGrid1.Columns.grid.SelectedIndex + 1].Field.FocusControl else begin Table1.next; DBGrid1.Columns[0].field.FocusControl; end; end;
◇[DELPHI]如何安装控件
安装方法:
1.对于单个控件,Component–>install component..–>PAS或DCU文件–>install
2.对于带*.dpk文件的控件包,File–>open(下拉列表框中选*.dpk)–>install即可.
3.对于带*.dpl文件的控件包,Install Packages–>Add–>dpl文件名即可。
4.如果以上Install按钮为失效的话,试试Compile按钮。
5.是run time lib则在option下的packages下的runtimepackes加之.
如果编译时提示文件找不到的话,一般是控件的安装目录不在delphi的Lib目录中,有两种方法可以解决:
1.把安装的原文件拷入到delphi的Lib目录下。
2.或者Tools–>Environment Options中把控件原代码路径加入到Delphi的Lib目录中即可。
◇[DELPHI]目录完全删除(deltree)
procedure TForm1.DeleteDirectory(strDir:String); var sr: TSearchRec; FileAttrs: Integer; strfilename:string; strPth:string; begin strpth:=Getcurrentdir(); FileAttrs := faAnyFile; if FindFirst(strpth+’\'+strdir+’\*.*’, FileAttrs, sr) = 0 then begin if (sr.Attr and FileAttrs) = sr.Attr then begin strfilename:=sr.Name; if fileexists(strpth+’\'+strdir+’\'+strfilename) then deletefile(strpth+’\'+strdir+’\'+strfilename); end; while FindNext(sr) = 0 do begin if (sr.Attr and FileAttrs) = sr.Attr then begin strfilename:=sr.name; if fileexists(strpth+’\'+strdir+’\'+strfilename) then deletefile(strpth+’\'+strdir+’\'+strfilename); end; end; FindClose(sr); removedir(strpth+’\'+strdir); end; end;
◇[DELPHI]取得TMemo 控件当前光标的行和列信息到Tpoint中
1.function ReadCursorPos(SourceMemo: TMemo): TPoint; var Point: TPoint; begin point.y := SendMessage(SourceMemo.Handle,EM_LINEFROMCHAR,SourceMemo.SelStart,0); point.x := SourceMemo.SelStart-SendMessage(SourceMemo.Handle,EM_LINEINDEX,point.y,0); Result := Point; end; 2.LineLength:=SendMessage(memol．handle,EM-LINELENGTH,Cpos,0);//行长
◇[DELPHI]读硬盘序列号
function GetDiskSerial(DiskChar: Char): string; var SerialNum : pdword; a, b : dword; Buffer : array [0..255] of char; begin result := ""; if GetVolumeInformation(PChar(diskchar+":\"), Buffer, SizeOf(Buffer), SerialNum, a, b, nil, 0) then Result := IntToStr(SerialNum^); end;
◇[INTERNET]CSS常用综合技巧
1。P:first-letter { font-size: 300%; float: left }//首字会比普通字体加大三倍。
2。//连接一个外部样式表
3。嵌入一个样式表
4。 //内联样式
Arial//SPAN接受STYLE、CLASS和ID属性
DIV可以包含段落、标题、表格甚至其它部分
5。CLASS属性
//定义见3。
6。ID属性
//定义见3。
7。属性列表
字体风格:font-style: [normal | italic | oblique];
字体大小:font-size: [xx-small | x-small | small | medium | large | x-large | xx-large | larger | smaller | | ]
文本修饰:text-decoration:[ underline || overline || line-through || blink ]
文本转换:text-transform:[none | capitalize | uppercase | lowercase]
背景颜色:background-color:[ | transparent]
背景图象:background-image:[ | none]
行高:line-height: [normal | | | ]
边框样式:border-style: [ none | dotted | dashed | solid | double | groove | ridge | inset | outset ]
漂浮:float: [left | right | none]
8。长度单位
相对单位:
em (em,元素的字体的高度)
ex (x-height,字母 “x” 的高度)
px (像素,相对于屏幕的分辨率)
绝对长度:
in (英寸,1英寸=2.54厘米)
cm (厘米,1厘米=10毫米)
mm (米)
pt (点,1点=1/72英寸)
pc (帕,1帕=12点)
◇[DELPHI]VCL制作简要步骤
1.创建部件属性方法事件
(建立库单元,继承为新的类型,添加属性、方法、事件,注册部件,建立包文件)
2.消息处理
3.异常处理
4.部件可视
◇[DELPHI]动态连接库的装载
静态装载:procedure name;external ‘lib.dll’;
动态装载:var handle:Thandle;
handle:=loadlibrary(‘lib.dll’);
if handle<>0 then
begin
{dosomething}
freelibrary(handle);
end;
◇[DELPHI]指针变量和地址
var x,y:integer;p:^integer;//指向INTEGER变量的指针 x:=10;//变量赋值 p:=@x;//变量x的地址 y:=p^;//为Y赋值指针P @@procedure//返回过程变量的内存地址
◇[DELPHI]判断字符是汉字的一个字符
ByteType(‘你好haha吗’,1) = mbLeadByte//是第一个字符 ByteType(‘你好haha吗’,2) = mbTrailByte//是第二个字符 ByteType(‘你好haha吗’,5) = mbSingleByte//不是中文字符
◇[DELPHI]memo的定位操作
memo1.lines.delete(0)//删除第1行 memo1.selstart:=10//定位10字节处
◇[DELPHI]获得双字节字符内码
function getit(s: string): integer; begin Result := byte(s[1]) * 0 + byte(s[2]); end;
使用:getit(‘计’)//$bcc6 即十进制 48326
◇[DELPHI]调用ADD数据存储过程
存储过程如下:
create procedure addrecord( record1 varchar(10) record2 varchar(20) ) as begin insert into tablename (field1,field2) values(:record1,:record2) end
执行存储过程:
EXECUTE procedure addrecord("urrecord1","urrecord2")
◇[DELPHI]将文件存到blob字段中
function blobcontenttostring(const filename: string):string; begin with tfilestream.create(filename,fmopenread) do try setlength(Result,size); read(Pointer(Result)^,size); finally free; end; end; //保存字段 begin if (opendialog1.execute) then begin sFileName:=OpenDialog1.FileName; adotable1.edit; adotable1.fieldbyname(‘visio’).asstring:=Blobcontenttostring(FileName); adotable1.post; end;
◇[DELPHI]把文件全部复制到剪贴板
uses shlobj,activex,clipbrd; procedure Tform1.copytoclipbrd(var FileName:string); var FE:TFormatEtc; Medium: TStgMedium; dropfiles:PDropFiles; pFile:PChar; begin FE.cfFormat := CF_HDROP; FE.dwAspect := DVASPECT_CONTENT; FE.tymed := TYMED_HGLOBAL; Medium.hGlobal := GlobalAlloc(GMEM_SHARE or GMEM_ZEROINIT, SizeOf(TDropFiles)+length(FileName)+1); if Medium.hGlobal<>0 then begin Medium.tymed := TYMED_HGLOBAL; dropfiles := GlobalLock(Medium.hGlobal); try dropfiles^.pfiles := SizeOf(TDropFiles); dropfiles^.fwide := False; longint(pFile) := longint(dropfiles)+SizeOf(TDropFiles); StrPCopy(pFile,FileName); Inc(pFile, Length(FileName)+1); pFile^ := #0; finally GlobalUnlock(Medium.hGlobal); end; Clipboard.SetAsHandle(CF_HDROP,Medium.hGlobal); end; end;
◇[DELPHI]列举当前系统运行进程
uses TLHelp32; procedure TForm1.Button1Click(Sender: TObject); var lppe: TProcessEntry32; found : boolean; Hand : THandle; begin Hand := CreateToolhelp32Snapshot(TH32CS_SNAPALL,0); found := Process32First(Hand,lppe); while found do begin ListBox1.Items.Add(StrPas(lppe.szExeFile)); found := Process32Next(Hand,lppe); end; end;
◇[DELPHI]根据BDETable1建立新表Table2
Table2:=TTable.Create(nil); try Table2.DatabaseName:=Table1.DatabaseName; Table2.FieldDefs.Assign(Table1.FieldDefs); Table2.IndexDefs.Assign(Table1.IndexDefs); Table2.TableName:=’new_table’; Table2.CreateTable(); finally Table2.Free(); end;
◇[DELPHI]最菜理解DLL建立和引用
//先看DLL source(FILE–>NEW–>DLL)
library project1;
uses
SysUtils, Classes;
function addit(f:integer;s:integer):integer;export;
begin
makeasum:=f+s;
end;
exports
addit;
end.
//调用(IN ur PROJECT)
implementation
function addit(f:integer;s:integer):integer;far;external ‘project1′;//申明
{调用就是addit(2,4);结果显示6}
◇[DELPHI]动态读取程序自身大小
function GesSelfSize: integer; var f: file of byte; begin filemode := 0; assignfile(f, application.exename); reset(f); Result := filesize(f);//单位是字节 closefile(f); end;
◇[DELPHI]读取BIOS信息
with Memo1.Lines do begin Add(‘MainBoardBiosName:’+^I+string(Pchar(Ptr($FE061)))); Add(‘MainBoardBiosCopyRight:’+^I+string(Pchar(Ptr($FE091)))); Add(‘MainBoardBiosDate:’+^I+string(Pchar(Ptr($FFFF5)))); Add(‘MainBoardBiosSerialNo:’+^I+string(Pchar(Ptr($FEC71)))); end;
◇[DELPHI]动态建立MSSQL别名
procedure TForm1.Button1Click(Sender: TObject); var MyList: TStringList; begin MyList := TStringList.Create; try with MyList do begin Add(‘SERVER NAME=210.242.86.2′); Add(‘DATABASE NAME=db’); Add(‘USER NAME=sa’); end; Session1.AddAlias(‘TESTSQL’, ‘MSSQL’, MyList); // ミMSSQL Session1.SaveConfigFile; finally MyList.Free; Session1.Active:=True; Database1.DatabaseName:=’DB’; Database1.AliasName:=’TESTSQL’; Database1.LoginPrompt:=False; Database1.Params.Add(‘USER NAME=sa’); Database1.Params.Add(‘PASSWORD=’); Database1.Connected:=True; end; end; procedure TForm1.Button2Click(Sender: TObject); begin Database1.Connected:=False; Session1.DeleteAlias(‘TESTSQL’); end;
◇[DELPHI]播放背景音乐
uses mmsystem //播放音乐 MCISendString(‘OPEN e:.MID TYPE SEQUENCER ALIAS NN’, ”, 0, 0); MCISendString(‘PLAY NN FROM 0′, ”, 0, 0); MCISendString(‘CLOSE ANIMATION’, ”, 0, 0); end; //停止播放 MCISendString(‘OPEN e:.MID TYPE SEQUENCER ALIAS NN’, ”, 0, 0); MCISendString(‘STOP NN’, ”, 0, 0); MCISendString(‘CLOSE ANIMATION’, ”, 0, 0);
◇[DELPHI]接口和类的一个范例代码
Type{接口和类申明:区别在于不能在接口中申明数据成员、任何非公有的方法、公共方法不使用PUBLIC关键字}
Isample=interface//定义Isample接口
function getstring:string;
end;
Tsample=class(TInterfacedObject,Isample)
public
function getstring:string;
end;
//function定义
function Tsample.getstring:string;
begin
result:=’what show is ‘;
end;
//调用类对象
var sample:Tsample;
begin
sample:=Tsample.create;
showmessage(sample.getstring+’class object!’);
sample.free;
end;
//调用接口
var sampleinterface:Isample;
sample:Tsample;
begin
sample:=Tsample.create;
sampleInterface:=sample;//Interface的实现必须使用class
{以上两行也可表达成sampleInterface:=Tsample.create;}
showmessage(sampleInterface.getstring+’Interface!’);
//sample.free;{和局部类不同,Interface中的类自动释放}
sampleInterface:=nil;{释放接口对象}
end;
◇[DELPHI]任务条就看不当程序
var ExtendedStyle : Integer; begin Application.Initialize; ExtendedStyle := GetWindowLong (Application.Handle, GWL_EXSTYLE); SetWindowLong(Application.Handle, GWL_EXSTYLE, ExtendedStyle OR WS_EX_TOOLWINDOW AND NOT WS_EX_APPWINDOW); Application.CreateForm(TForm1, Form1); Application.Run; end.
◇[DELPHI]ALT+CTRL+DEL看不到程序
在implementation后添加声明: function RegisterServiceProcess(dwProcessID, dwType: Integer): Integer; stdcall; external ‘KERNEL32.DLL’; RegisterServiceProcess(GetCurrentProcessID, 1);//隐藏 RegisterServiceProcess(GetCurrentProcessID, 0);//显示
◇[DELPHI]检测光驱符号
var drive:char; cdromID:integer; begin for drive:=’d’ to ‘z’ do begin cdromID:=GetDriveType(pchar(drive+’:\’)); if cdromID=5 then showmessage(‘你的光驱为:’+drive+’盘!’); end; end;
◇[DELPHI]检测声卡
if auxGetNumDevs()<=0 then showmessage(‘No soundcard found!’) else showmessage(‘Any soundcard found!’);
◇[DELPHI]在字符串网格中画图
StringGrid.OnDrawCell事件 with StringGrid1.Canvas do Draw(Rect.Left, Rect.Top, Image1.Picture.Graphic);
◇[SQL SERVER]SQL中代替Like语句的另一种写法
比如查找用户名包含有”c”的所有用户, 可以用
use mydatabase select * from table1 where username like’%c%"
下面是完成上面功能的另一种写法:
use mydatabase select * from table1 where charindex(‘c’,username)>0
这种方法理论上比上一种方法多了一个判断语句,即>0, 但这个判断过程是最快的, 我想信80%以上的运算都是花在查找字
符串及其它的运算上, 所以运用charindex函数也没什么大不了. 用这种方法也有好处, 那就是对%,|等在不能直接用like
查找到的字符中可以直接在这charindex中运用, 如下:
use mydatabase select * from table1 where charindex(‘%’,username)>0
也可以写成:
use mydatabase select * from table1 where charindex(char(37),username)>0
ASCII的字符即为%
◇[DELPHI]SQL显示多数据库/表
SELECT DISTINCT A.bianhao,a.xingming, b.gongzi FROM "jianjie.dbf" a, "gongzi.DBF" b WHERE A.bianhao=b.bianhao
◇[DELPHI]RFC(Request For Comment)相关
IETF(Internet Engineering Task Force)维护RFC文档http://www.ietf.cnri.reston.va.us
RFC882:报文头标结构
RFC1521:MIME第一部分,传输报文方法
RFC1945:多媒体文档传输文档
◇[DELPHI]TNMUUProcessor的使用
var inStream,outStream:TFileStream;
begin
inStream:=TFileStream.create(infile.txt,fmOpenRead);
outStream:=TFileStream(outfile.txt,fmCreate);
NMUUE.Method:=uuCode;{UUEncode/Decode}
//NMUUE.Method:=uuMIME;{MIME}
NMUUE.InputStream:=InStream;
NMUUE.OutputStream:=OutStream;
NMUUE.Encode;{编码处理}
//NMUUE.Decode;{解码处理}
inStream.free;
outStream.free;
end;
◇[DELPHI]TFileStream的操作
//从文件流当前位置读count字节到缓冲区BUFFER
function read(var buffer;count:longint):longint;override;
//将缓冲区BUFFER读到文件流中
function write(const buffer;count:longint):longint;override;
//设置文件流当前读写指针为OFFSET
function seek(offset:longint;origin:word):longint;override;
origin={soFromBeginning,soFromCurrent,soFromEnd}
//从另一文件流中当前位置复制COUNT到当前文件流当前位置
function copyfrom(source:TStream;count:longint):longint;
//读指定文件到文件流
var myFStream:TFileStream;
begin
myFStream:=TFileStream.create(OpenDialog1.filename,fmOpenRead);
end;
[JavaScript]检测是否安装IE插件Shockwave&Quicktime
var myPlugin = navigator.plugins["Shockwave"];
if (myPlugin)
document.writeln("你已经安装了 Shockwave!")
else
document.writeln("你尚未安装 Shockwave!")
var myPlugin = navigator.plugins["Quicktime"];
if (myPlugin)
document.writeln("你已经安装了Quicktime!")
else
document.writeln("你尚未安装 Quicktime!")