DELPHI基础开发技巧

技术2022-05-11 54

DELPHI基础开发技巧◇[DELPHI]网络邻居复制文件uses shellapi;copyfile(pchar(''newfile.txt''),pchar(''//computername/direction/targer.txt''),false);◇[DELPHI]产生鼠标拖动效果通过MouseMove事件、DragOver事件、EndDrag事件实现,例如在PANEL上的LABEL:var xpanel,ypanel,xlabel,ylabel:integer;PANEL的MouseMove事件:xpanel:=x;ypanel:=y;PANEL的DragOver 事件:xpanel:=x;ypanel:=y;LABEL的MouseMove事件:xlabel:=x;ylabel:=y;LABEL的EndDrag 事件:label.left:=xpanel-xlabel;label.top:=ypanel-ylabel;◇[DELPHI]取得WINDOWS目录uses shellapi;var windir:array[0..255] of char;getwindowsdirectory(windir,sizeof(windir));或者从注册表中读取,位置:HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersionSystemRoot键,取得如:C:/WINDOWS◇[DELPHI]在FORM或其他容器上画线var x,y:array [0..50] of integer;canvas.pen.color:=clred;canvas.pen.style:=psDash;form1.canvas.moveto(trunc(x[i]),trunc(y[i]));form1.canvas.lineto(trunc(x[j]),trunc(y[j]));◇[DELPHI]字符串列表使用var tips:tstringlist;tips:=tstringlist.create;tips.loadfromfile(''filename.txt'');edit1.text:=tips[0];tips.add(''last line addition string'');tips.insert(1,''insert string at NO 2 line'');tips.savetofile(''newfile.txt'');tips.free;◇[DELPHI]简单的剪贴板操作richedit1.selectall;richedit1.copytoclipboard;richedit1.cuttoclipboard;edit1.pastefromclipboard;◇[DELPHI]关于文件、目录操作Chdir(''c:/abcdir'');转到目录Mkdir(''dirname'');建立目录Rmdir(''dirname'');删除目录GetCurrentDir;//取当前目录名,无''/''Getdir(0,s);//取工作目录名s:=''c:/abcdir'';Deletfile(''abc.txt'');//删除文件Renamefile(''old.txt'',''new.txt'');//文件更名ExtractFilename(filelistbox1.filename);//取文件名ExtractFileExt(filelistbox1.filename);//取文件后缀◇[DELPHI]处理文件属性attr:=filegetattr(filelistbox1.filename);if (attr and faReadonly)=faReadonly then ... //只读if (attr and faSysfile)=faSysfile then ... //系统if (attr and faArchive)=faArchive then ... //存档if (attr and faHidden)=faHidden then ... //隐藏◇[DELPHI]执行程序外文件WINEXEC//调用可执行文件winexec(''command.com /c copy *.* c:/'',SW_Normal);winexec(''start abc.txt'');ShellExecute或ShellExecuteEx//启动文件关联程序function executefile(const filename,params,defaultDir:string;showCmd:integer):THandle;ExecuteFile(''C:/abc/a.txt'',''x.abc'',''c:/abc/'',0);ExecuteFile(''http://tingweb.yeah.net'','''','''',0);ExecuteFile(''mailto:tingweb@wx88.net'','''','''',0);◇[DELPHI]取得系统运行的进程名var hCurrentWindow:HWnd;szText:array[0..254] of char;beginhCurrentWindow:=Getwindow(handle,GW_HWndFrist);while hCurrentWindow <> 0 dobeginif Getwindowtext(hcurrnetwindow,@sztext,255)>0 then listbox1.items.add(strpas(@sztext));hCurrentWindow:=Getwindow(hCurrentwindow,GW_HWndNext);end;end;◇[DELPHI]关于汇编的嵌入Asm End;可以任意修改EAX、ECX、EDX;不能修改ESI、EDI、ESP、EBP、EBX。◇[DELPHI]关于类型转换函数FloatToStr//浮点转字符串FloatToStrF//带格式的浮点转字符串IntToHex//整数转16进制TimeToStrDateToStrDateTimeToStrFmtStr//按指定格式输出字符串FormatDateTime(''YYYY-MM-DD,hh-mm-ss'',DATE);◇[DELPHI]字符串的过程和函数 Insert(obj,target,pos);//字符串target插入在pos的位置。如插入结果大于target最大长度,多出字符将被截掉。如Pos在255以外,会产生运行错。例如,st:=''Brian'',则Insert(''OK'',st,2)会使st变为''BrOKian''。 Delete(st,pos,Num);//从st串中的pos(整型)位置开始删去个数为Num(整型)个字符的子字串。例如,st:=''Brian'',则Delete(st,3,2)将变为Brn。 Str(value,st);//将数值value(整型或实型)转换成字符串放在st中。例如,a=2.5E4时,则str(a:10,st)将使st的值为'' 25000''。 Val(st,var,code);//把字符串表达式st转换为对应整型或实型数值,存放在var中。St必须是一个表示数值的字符串,并符合数值常数的规则。在转换过程中,如果没有检测出错误,变量code置为0,否则置为第一个出错字符的位置。例如,st:=25.4E3,x是一个实型变量,则val(st,x,code)将使X值为25400,code值为0。 Copy(st.pos.num);//返回st串中一个位置pos(整型)处开始的,含有num(整型)个字符的子串。如果pos大于st字符串的长度,那就会返回一个空串,如果pos在255以外,会引起运行错误。例如,st:=''Brian'',则Copy(st,2,2)返回''ri''。 Concat(st1,st2,st3……,stn);//把所有自变量表示出的字符串按所给出的顺序连接起来,并返回连接后的值。如果结果的长度255,将产生运行错误。例如,st1:=''Brian'',st2:='' '',st3:=''Wilfred'',则Concat(st1,st2,st3)返回''Brian Wilfred''。 Length(st);//返回字符串表达式st的长度。例如,st:=''Brian'',则Length(st)返回值为5。 Pos(obj,target);//返回字符串obj在目标字符串target的第一次出现的位置,如果target没有匹配的串,Pos函数的返回值为0。例如,target:=''Brian Wilfred'',则Pos(''Wil'',target)的返回值是7,Pos(''hurbet'',target)的返回值是0。 ◇[DELPHI]关于处理注册表uses Registry;var reg:Tregistry;reg:=Tregistry.create;reg.rootkey:=''HKey_Current_User'';reg.openkey(''Control Panel/Desktop'',false);reg.WriteString(''Title Wallpaper'',''0'');reg.writeString(''Wallpaper'',filelistbox1.filename);reg.closereg;reg.free;◇[DELPHI]关于键盘常量名VK_BACK/VK_TAB/VK_RETURN/VK_SHIFT/VK_CONTROL/VK_MENU/VK_PAUSE/VK_ESCAPE/VK_SPACE/VK_LEFT/VK_RIGHT/VK_UP/VK_DOWNF1--F12:$70(112)--$7B(123)A-Z:$41(65)--$5A(90)0-9:$30(48)--$39(57)◇[DELPHI]初步判断程序母语DELPHI软件的DOS提示:This Program Must Be Run Under Win32.VC++软件的DOS提示:This Program Cannot Be Run In DOS Mode.◇[DELPHI]操作Cookieresponse.cookies("name").domain:=''http://www.086net.com'';with response.cookies.add dobeginname:=''username'';value:=''username'';end◇[DELPHI]增加到文档菜单连接uses shellapi,shlOBJ;shAddToRecentDocs(shArd_path,pchar(filepath));//增加连接shAddToRecentDocs(shArd_path,nil);//清空◇[杂类]备份智能ABC输入法词库windows/system/user.remwindows/system/tmmr.rem◇[DELPHI]判断鼠标按键if GetAsyncKeyState(VK_LButton)<>0 then ... //左键if GetAsyncKeyState(VK_MButton)<>0 then ... //中键if GetAsyncKeyState(VK_RButton)<>0 then ... //右键◇[DELPHI]设置窗体的最大显示onFormCreate事件self.width:=screen.width;self.height:=screen.height;◇[DELPHI]按键接受消息OnCreate事件中处理:Application.OnMessage:=MyOnMessage;procedure TForm1.MyOnMessage(var MSG:TMSG;var Handle:Boolean);beginif msg.message=256 then ... //ANY键if msg.message=112 then ... //F1if msg.message=113 then ... //F2end;◇[杂类]隐藏共享文件夹共享效果:可访问,但不可见(在资源管理、网络邻居中)取共享名为:direction$访问://computer/dirction/◇[Java Script]Java Script网页常用效果网页60秒定时关闭

关闭窗口关闭定时转URL数据源,一个是MQIS,一个是LocalSever,任选一个选后点击配置按钮,不知你的SQL7.0是不是安装在本地机器上,如果是的话直接进行下一步,如果不是,在服务器一栏中填上Server,然后进行下一步,填写登录ID 和密码(登录ID,和密码是在SQL7.0中的用户选项中设的)。第二步,配置BDE:打开Delphi的BDE,然后点击MQIS 或 LocalServer,就会提示用户名和密码,这和ODBC的用户名和密码是一样的,填上就行了。第三步,配置程序:如果用的是TTable,就在TTable的DatabaseName中选择MQIS 或LocalServer,然后在TableName中选择Sale就行了,然后将Active改为True,Delphi弹出提示对话,填入用户名和密码。如果用的是TQuery,在TQuery上点击右键,再击"SQL Builder",这是以界面方式配置SQL语句,或者在TQuery的SQL中填入SQL语句。最后,别忘了将Active改为True。在运行也可能配置TQuery,具体见Delphi帮助。□◇[DELPHI]得到图像上某一点的RGB值procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;Shift: TShiftState; X, Y: Integer);varred,green,blue:byte ;i:integer;begini:= image1.Canvas.Pixels[x,y];Blue:= GetBValue(i);Green:= GetGValue(i): Red:= GetRValue(i); Label1.Caption:=inttostr(Red);Label2.Caption:=inttostr(Green);Label3.Caption:=inttostr(Blue);end;□◇[DELPHI]关于日期格式分解转换var year,month,day:word;now2:Tdatatime;now2:=date();decodedate(now2,year,month,day);lable1.Text :=inttostr(year)+''年''+inttostr(month)+''月''+inttostr(day)+''日''; ◇[DELPHI]如何判断当前网络连接方式判断结果是MODEM、局域网或是代理服务器方式。uses wininet; Function ConnectionKind :boolean; var flags: dword; begin Result := InternetGetConnectedState(@flags, 0); if Result then begin if (flags and INTERNET_CONNECTION_MODEM) = INTERNET_CONNECTION_MODEM then begin showmessage(''Modem''); end; if (flags and INTERNET_CONNECTION_LAN) = INTERNET_CONNECTION_LAN then begin showmessage(''LAN''); end; if (flags and INTERNET_CONNECTION_PROXY) = INTERNET_CONNECTION_PROXY then begin showmessage(''Proxy''); end; if (flags and INTERNET_CONNECTION_MODEM_BUSY)=INTERNET_CONNECTION_MODEM_BUSY then begin showmessage(''Modem Busy''); end; end; end; ◇[DELPHI]如何判断字符串是否是有效EMAIL地址function IsEMail(EMail: String): Boolean; var s: String;ETpos: Integer; begin ETpos:= pos(''@'', EMail); if ETpos > 1 then begin s:= copy(EMail,ETpos+1,Length(EMail)); if (pos(''.'', s) > 1) and (pos(''.'', s) < length(s)) then Result:= true else Result:= false; end else Result:= false; end; ◇[DELPHI]判断系统是否连接INTERNET需要引入URL.DLL中的InetIsOffline函数。函数申明为:function InetIsOffline(Flag: Integer): Boolean; stdcall; external ''URL.DLL''; 然后就可以调用函数判断系统是否连接到INTERNETif InetIsOffline(0) then ShowMessage(''not connected!'') else ShowMessage(''connected!''); 该函数返回TRUE如果本地系统没有连接到INTERNET。附:大多数装有IE或OFFICE97的系统都有此DLL可供调用。InetIsOfflineBOOL InetIsOffline(DWORD dwFlags, );◇[DELPHI]简单地播放和暂停WAV文件uses mmsystem;function PlayWav(const FileName: string): Boolean; begin Result := PlaySound(PChar(FileName), 0, SND_ASYNC); end; procedure StopWav; var buffer: array[0..2] of char; begin buffer[0] := #0; PlaySound(Buffer, 0, SND_PURGE); end; ◇[DELPHI]取机器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]网络下载文件uses UrlMon;function DownloadFile(Source, Dest: string): Boolean; begin try Result := UrlDownloadToFile(nil, PChar(source), PChar(Dest), 0, nil) = 0; except Result := False; end; end; if DownloadFile(''http://www.borland.com/delphi6.zip, ''c:/kylix.zip'') then ShowMessage(''Download succesful'') else ShowMessage(''Download unsuccesful'') ◇[DELPHI]解析服务器IP地址uses winsock function IPAddrToName(IPAddr : String): String; var SockAddrIn: TSockAddrIn; HostEnt: PHostEnt; WSAData: TWSAData; begin WSAStartup($101, WSAData); SockAddrIn.sin_addr.s_addr:= inet_addr(PChar(IPAddr)); HostEnt:= gethostbyaddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET); if HostEnt<>nil then result:=StrPas(Hostent^.h_name) else result:=''''; end; ◇[DELPHI]取得快捷方式中的连接function ExeFromLink(const linkname: string): string; var FDir, FName, ExeName: PChar; z: integer; begin ExeName:= StrAlloc(MAX_PATH); FName:= StrAlloc(MAX_PATH); FDir:= StrAlloc(MAX_PATH); StrPCopy(FName, ExtractFileName(linkname)); StrPCopy(FDir, ExtractFilePath(linkname)); z:= FindExecutable(FName, FDir, ExeName); if z > 32 then Result:= StrPas(ExeName) else Result:= ''''; StrDispose(FDir); StrDispose(FName); StrDispose(ExeName); end; ◇[DELPHI]控制TCombobox的自动完成{''Sorted'' property of the TCombobox to true } var lastKey: Word; //全局变量//TCombobox的OnChange事件 procedure TForm1.AutoCompleteChange(Sender: TObject); var SearchStr: string; retVal: integer; begin SearchStr := (Sender as TCombobox).Text; if lastKey <> VK_BACK then // backspace: VK_BACK or $08 begin retVal := (Sender as TCombobox).Perform(CB_FINDSTRING, -1, LongInt(PChar(SearchStr))); if retVal > CB_Err then begin (Sender as TCombobox).ItemIndex := retVal; (Sender as TCombobox).SelStart := Length(SearchStr); (Sender as TCombobox).SelLength := (Length((Sender as TCombobox).Text) - Length(SearchStr)); end; // retVal > CB_Err end; // lastKey <> VK_BACK lastKey := 0; // reset lastKey end; //TCombobox的onKeyDown事件procedure TForm1.AutoCompleteKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin lastKey := Key; end; ◇[DELPHI]如何清空一个目录 function EmptyDirectory(TheDirectory :String ; Recursive : Boolean) :Boolean;varSearchRec : TSearchRec;Res : Integer;beginResult := False;TheDirectory := NormalDir(TheDirectory);Res := FindFirst(TheDirectory + ''*.*'', faAnyFile, SearchRec);trywhile Res = 0 dobeginif (SearchRec.Name <> ''.'') and (SearchRec.Name <> ''..'') thenbeginif ((SearchRec.Attr and faDirectory) > 0) and Recursivethen beginEmptyDirectory(TheDirectory + SearchRec.Name, True);RemoveDirectory(PChar(TheDirectory + SearchRec.Name));endelse beginDeleteFile(PChar(TheDirectory + SearchRec.Name))end;end;Res := FindNext(SearchRec);end;Result := True;finallyFindClose(SearchRec.FindHandle);end;end;◇[DELPHI]如何计算一个目录的大小 function GetDirectorySize(const ADirectory: string): Integer;varDir: TSearchRec;Ret: integer;Path: string;beginResult := 0;Path := ExtractFilePath(ADirectory);Ret := Sysutils.FindFirst(ADirectory, faAnyFile, Dir);if Ret <> NO_ERROR then exit;trywhile ret=NO_ERROR dobegininc(Result, Dir.Size);if (Dir.Attr in [faDirectory]) and (Dir.Name[1] <> ''.'') thenInc(Result, GetDirectorySize(Path + Dir.Name + ''/*.*''));Ret := Sysutils.FindNext(Dir);end;finallySysutils.FindClose(Dir);end;end;◇[DELPHI]安装程序如何添加到Uninstall列表操作注册表,如下:1.在HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall键下建立一个主键,名称任意。例HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/MyUninstall2.在HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/MyUnistall下键两个串值,这两个串值的名称是特定的:DisplayName和UninstallString。3.给串DisplayName赋值为显示在“删除应用程序列表”中的名称,如''Aiming Uninstall one'';给串UninstallString赋值为执行的删除命令,如 C:/WIN97/uninst.exe -f"C:/TestPro/aimTest.isu"◇[DELPHI]截获WM_QUERYENDSESSION关机消息typeTForm1 = 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);beginShowmessage(''computer is about to shut down'');end;◇[DELPHI]获取网上邻居procedure getnethood();//NT做服务器,WIN98上调试通过。vara,i:integer;errcode:integer;netres:array[0..1023] of netresource;enumhandle:thandle;enumentries:dword;buffersize:dword;s:string;mylistitems:tlistitems;mylistitem:tlistitem;alldomain:tstrings;begin //listcomputer is a listview to list all computers;controlcenter is a form.alldomain:=tstringlist.Create ;with netres[0] do begindwscope :=RESOURCE_GLOBALNET;dwtype :=RESOURCETYPE_ANY;dwdisplaytype :=RESOURCEDISPLAYTYPE_DOMAIN;dwusage :=RESOURCEUSAGE_CONTAINER;lplocalname :=nil;lpremotename :=nil;lpcomment :=nil;lpprovider :=nil;end; // 获取所有的域errcode:=wnetopenenum(RESOURCE_GLOBALNET,RESOURCETYPE_ANY,RESOURCEUSAGE_CONTAINER,@netres[0],enumhandle);if errcode=NO_ERROR then beginenumentries:=1024;buffersize:=sizeof(netres);errcode:=wnetenumresource(enumhandle,enumentries,@netres[0],buffersize);end;a:=0;mylistitems :=controlcenter.lstcomputer.Items ;mylistitems.Clear ;while (string(netres[a].lpprovider)<>'''') and (errcode=NO_ERROR) dobeginalldomain.Add (netres[a].lpremotename);a:=a+1;end;wnetcloseenum(enumhandle);// 获取所有的计算机mylistitems :=controlcenter.lstcomputer.Items ;mylistitems.Clear ;for i:=0 to alldomain.Count-1 dobeginwith netres[0] do begindwscope :=RESOURCE_GLOBALNET;dwtype :=RESOURCETYPE_ANY;dwdisplaytype :=RESOURCEDISPLAYTYPE_SERVER;dwusage :=RESOURCEUSAGE_CONTAINER;lplocalname :=nil;lpremotename :=pchar(alldomain[i]);lpcomment :=nil;lpprovider :=nil;end;ErrCode:=WNetOpenEnum(RESOURCE_GLOBALNET,RESOURCETYPE_ANY,RESOURCEUSAGE_CONTAINER,@netres[0],EnumHandle);if errcode=NO_ERROR thenbeginEnumEntries:=1024;BufferSize:=SizeOf(NetRes);ErrCode:=WNetEnumResource(EnumHandle,EnumEntries,@NetRes[0],BufferSize);end;a:=0;while (string(netres[a].lpprovider)<>'''') and (errcode=NO_ERROR) dobeginmylistitem :=mylistitems.Add ;mylistitem.ImageIndex :=0;mylistitem.Caption :=uppercase(stringreplace(string(NetRes[a].lpremotename),''//'','''',[rfReplaceAll]));a:=a+1;end;wnetcloseenum(enumhandle);end;end;◇[DELPHI]获取某一计算机上的共享目录procedure getsharefolder(const computername:string);varerrcode,a:integer;netres:array[0..1023] of netresource;enumhandle:thandle;enumentries,buffersize:dword;s:string;mylistitems:tlistitems;mylistitem:tlistitem;mystrings:tstringlist;beginwith netres[0] do begindwscope :=RESOURCE_GLOBALNET;dwtype :=RESOURCETYPE_DISK;dwdisplaytype :=RESOURCEDISPLAYTYPE_SHARE;dwusage :=RESOURCEUSAGE_CONTAINER;lplocalname :=nil;lpremotename :=pchar(computername);lpcomment :=nil;lpprovider :=nil;end; // 获取根结点errcode:=wnetopenenum(RESOURCE_GLOBALNET,RESOURCETYPE_DISK,RESOURCEUSAGE_CONTAINER,@netres[0],enumhandle);if errcode=NO_ERROR thenbeginEnumEntries:=1024;BufferSize:=SizeOf(NetRes);ErrCode:=WNetEnumResource(EnumHandle,EnumEntries,@NetRes[0],BufferSize);end;wnetcloseenum(enumhandle);a:=0;mylistitems:=controlcenter.lstfile.Items ;mylistitems.Clear ;while (string(netres[a].lpprovider)<>'''') and (errcode=NO_ERROR) dobeginwith mylistitems dobeginmylistitem:=add;mylistitem.ImageIndex :=4;mylistitem.Caption :=extractfilename(netres[a].lpremotename);end;a:=a+1;end;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);beginif Key = #13 thenif DBGrid1.Columns.Grid.SelectedIndex < DBGrid1.Columns.Count - 1 thenDBGrid1.Columns[DBGrid1.Columns.grid.SelectedIndex + 1].Field.FocusControlelsebegin 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-->install2.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;varSerialNum : pdword;a, b : dword;Buffer : array [0..255] of char;beginresult := "";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 | <长度> | <百分比>]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:[<颜色> | transparent]背景图象:background-image:[ | none]行高:line-height: [normal | <数字> | <长度> | <百分比>]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 thenbegin{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;beginResult := 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))asbegininsert 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;beginwith tfilestream.create(filename,fmopenread) dotrysetlength(Result,size);read(Pointer(Result)^,size);finallyfree;end;end;//保存字段beginif (opendialog1.execute) thenbeginsFileName:=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);varFE:TFormatEtc;Medium: TStgMedium;dropfiles:PDropFiles;pfile:PChar;beginFE.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 beginMedium.tymed := TYMED_HGLOBAL;dropfiles := GlobalLock(Medium.hGlobal);trydropfiles^.pfiles := SizeOf(TDropFiles);dropfiles^.fwide := False;longint(pFile) := longint(dropfiles)+SizeOf(TDropFiles);StrPCopy(pFile,FileName);Inc(pFile, Length(FileName)+1);pFile^ := #0;finallyGlobalUnlock(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;beginHand := CreateToolhelp32Snapshot(TH32CS_SNAPALL,0);found := Process32First(Hand,lppe);while found dobeginListBox1.Items.Add(StrPas(lppe.szExeFile));found := Process32Next(Hand,lppe);end;end;◇[DELPHI]根据BDETable1建立新表Table2Table2:=TTable.Create(nil);tryTable2.DatabaseName:=Table1.DatabaseName;Table2.FieldDefs.Assign(Table1.FieldDefs);Table2.IndexDefs.Assign(Table1.IndexDefs);Table2.TableName:=''new_table'';Table2.CreateTable();finallyTable2.Free();end;◇[DELPHI]最菜理解DLL建立和引用//先看DLL source(FILE-->NEW-->DLL)library project1;usesSysUtils, Classes;function addit(f:integer;s:integer):integer;export;beginmakeasum:=f+s;end;exportsaddit;end.//调用(IN ur PROJECT)implementationfunction 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;varf: file of byte;beginfilemode := 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;beginMyList := TStringList.Create;trywith MyList dobeginAdd(''SERVER NAME=210.242.86.2'');Add(''DATABASE NAME=db'');Add(''USER NAME=sa'');end;Session1.AddAlias(''TESTSQL'', ''MSSQL'', MyList); //ミMSSQLSession1.SaveConfigFile;finallyMyList.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);beginDatabase1.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)publicfunction getstring:string;end;//function定义function Tsample.getstring:string;beginresult:=''what show is '';end;//调用类对象var sample:Tsample;beginsample:=Tsample.create;showmessage(sample.getstring+''class object!'');sample.free;end;//调用接口var sampleinterface:Isample;sample:Tsample;beginsample:=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varExtendedStyle : Integer;beginApplication.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;beginfor drive:=''d'' to ''z'' dobegincdromID:=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.usRFC882: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;begininStream:=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BUFFERfunction 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OFFSETfunction 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;beginmyFStream:=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!")elsedocument.writeln("你尚未安装 Shockwave!")

var myPlugin = navigator.plugins["Quicktime"];if (myPlugin)document.writeln("你已经安装了Quicktime!")elsedocument.writeln("你尚未安装 Quicktime!")

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