DELPHI基础开发技巧

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\CurrentVersion
SystemRoot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;
begin
hCurrentWindow:=Getwindow(handle,GW_HWndFrist);
while hCurrentWindow <> 0 do
begin
if 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
TimeToStr
DateToStr
DateTimeToStr
FmtStr//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_DOWN
F1--F12:$70(112)--$7B(123)
A-Z:$41(65)--$5A(90)
0-9:$30(48)--$39(57)
◇[DELPHI]初步判断程序母语
DELPHI软件的DOS提示:This Program Must Be Run Under Win32.
VC++软件的DOS提示:This Program Cannot Be Run In DOS Mode.
◇[DELPHI]操作Cookie
response.cookies("name").domain:='http://www.086net.com';
with response.cookies.add do
begin
name:='username';
value:='username';
end
◇[DELPHI]增加到文档菜单连接
uses shellapi,shlOBJ;
shAddToRecentDocs(shArd_path,pchar(filepath));//增加连接
shAddToRecentDocs(shArd_path,nil);//清空
◇[杂类]备份智能ABC输入法词库
windows\system\user.rem
windows\system\tmmr.rem
◇[DELPHI]判断鼠标按键
if GetAsyncKeyState(VK_LButton)<>0 then ... //左键
if GetAsyncKeyState(VK_MButton)<>0 then ... //中键
if GetAsyncKeyState(VK_RButton)<>0 then ... //右键
◇[DELPHI]设置窗体的最大显示
onFormCreate事件
self.width:=screen.width;
self.height:=screen.height;
◇[DELPHI]按键接受消息
OnCreate事件中处理:Application.OnMessage:=MyOnMessage;
procedure TForm1.MyOnMessage(var MSG:TMSG;var Handle:Boolean);
begin
if msg.message=256 then ... //ANY键
if msg.message=112 then ... //F1
if msg.message=113 then ... //F2
end;
◇[杂类]隐藏共享文件夹
共享效果:可访问,但不可见(在资源管理、网络邻居中)
取共享名为:direction$
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
◇[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]获取网上邻居
procedure getnethood();//NT做服务器,WIN98上调试通过。
var
a,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 begin
dwscope :=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 begin
enumentries:=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) do
begin
alldomain.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 do
begin
with netres[0] do begin
dwscope :=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 then
begin
EnumEntries:=1024;
BufferSize:=SizeOf(NetRes);
ErrCode:=WNetEnumResource(EnumHandle,EnumEntries,@NetRes[0],BufferSize);
end;
a:=0;
while (string(netres[a].lpprovider)<>'') and (errcode=NO_ERROR) do
begin
mylistitem :=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);
var
errcode,a:integer;
netres:array[0..1023] of netresource;
enumhandle:thandle;
enumentries,buffersize:dword;
s:string;
mylistitems:tlistitems;
mylistitem:tlistitem;
mystrings:tstringlist;
begin
with netres[0] do begin
dwscope :=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 then
begin
EnumEntries:=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) do
begin
with mylistitems do
begin
mylistitem:=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);
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 | <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 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]) * $100 + byte(s[2]);
end;
使用:getit('计')//$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]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); //?廿?MSSQL?O?W
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'); ?O?W
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]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!")