◇[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]获得双字节字符内码 function getit(s: string): integer; begin Result := byte(s[1]) * $100 + byte(s[2]); end; 使用：getit(''''计'''')//$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]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:\1.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:\1.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]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.
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