先人的DELPHI基础开发技巧_Delphi程序_学习笔记★闵涛★计算机学习电脑编程软硬件技巧


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先人的DELPHI基础开发技巧

作者：闵涛文章来源：闵涛的学习笔记点击数：2859 更新时间：2009/4/23 18:39:54

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;
var
SearchRec : TSearchRec;
Res : Integer;
begin
Result := False;
TheDirectory := NormalDir(TheDirectory);
Res := FindFirst(TheDirectory + ''''*.*'''', faAnyFile, SearchRec);
try
while Res = 0 do
begin
if (SearchRec.Name <> ''''.'''') and (SearchRec.Name <> ''''..'''') then
begin
if ((SearchRec.Attr and faDirectory) > 0) and Recursive
then begin
EmptyDirectory(TheDirectory + SearchRec.Name, True);
RemoveDirectory(PChar(TheDirectory + SearchRec.Name));
end
else begin
DeleteFile(PChar(TheDirectory + SearchRec.Name))
end;
end;
Res := FindNext(SearchRec);
end;
Result := True;
finally
FindClose(SearchRec.FindHandle);
end;
end;

◇[DELPHI]如何计算一个目录的大小
function GetDirectorySize(const ADirectory: string): Integer;
var
Dir: TSearchRec;
Ret: integer;
Path: string;
begin
Result := 0;
Path := ExtractFilePath(ADirectory);
Ret := Sysutils.FindFirst(ADirectory, faAnyFile, Dir);
if Ret <> NO_ERROR then exit;
try
while ret=NO_ERROR do
begin
inc(Result, Dir.Size);
if (Dir.Attr in [faDirectory]) and (Dir.Name[1] <> ''''.'''') then
Inc(Result, GetDirectorySize(Path + Dir.Name + ''''\*.*''''));
Ret := Sysutils.FindNext(Dir);
end;
finally
Sysutils.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\MyUninstall
2.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
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。<LINK REL=StyleSheet HREF="basics.css" TITLE="Contemporary">//连接一个外部样式表
3。嵌入一个样式表
<STYLE TYPE="text/css" MEDIA=screen>
<!--
@import url(http://www.htmlhelp.com/style.cs

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[Delphi程序]DELPHI基础开发技巧

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