1. Generate a random password (should be more useful) function CreatePass:String;const MAX_LEN=10;var i: integer; s: string;begin Randomize; s:='ABCDEFGHIJKLMNOPQRSTUVWXYZ'+'abcdefghijklmnopqrstuvwxyz'+ '0123456789'; Result := ''; for i := 0 to MAX_LEN-1 do begin Result := Result + s[Random(Length(s)-1)+1]; end;end;2. Convert decimal numbers to Roman numerals function DecToRoman(iDecimal: longint): string;const aRomans: array[1..13] of string = ('I', 'IV', 'V', 'IX', 'X', 'XL', 'L', 'XC', 'C', 'CD', 'D', 'CM', 'M'); aArabics: array[1..13] of integer = (1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000);var i: integer;begin result := ''; for i := 13 downto 1 do while (iDecimal >= aArabics[i]) do begin iDecimal := iDecimal - aArabics[i]; result := result + aRomans[i]; end;end;PRocedure TForm1.Button1Click(Sender : TObject);begin showmessage(DecToRoman(5));end;3. Formatting integer display using the FormatFloat function can solve many of your problems. For example, format 1200000 into 1,200,000 output procedure TForm1.Button1Click(Sender: TObject);var i:integer; s:string;begin i := 1200000; s := FormatFloat('#,0', i); showmessage(s );end;4. You can use the ClearCommError function to determine whether the serial port has received data. The cbInQue and cbOutQue in the TcomStat structure can help realize the judgment. 5. Convert RGB color to TColor class function RGBToColor(R,G,B:Byte): TColor;begin Result:=B Shl 16 Or G Shl 8 Or R;end;6. Convert TColor to RGB value procedure TForm1.Button1Click (Sender: TObject);var Color: TColor; R, G, B: Integer;begin Color := clBlack; R := Color and $FF; G := (Color and $FF00) shr 8; B := (Color and $FF0000) shr 16; showmessage(inttostr(R)); showmessage(inttostr(G)); showmessage(inttostr (B));end;7. Browse computer dialog box uses ShlObj;function BrowseForComputer(const winhandle : THANDLE; const title : string) : string;var BrowseInfo: TBrowseInfo; IDRoot: PItemIDList; Path: array[0..MAX_PATH] of Char;begin SHGetSpecialFolderLocation(winHandle, CSIDL_NETWORK, IDRoot); ZeroMemory(@BrowseInfo, SizeOf(TBrowseInfo)); ZeroMemory(@path, MAX_PATH); BrowseInfo.hwndOwner := winhandle; BrowseInfo.pidlRoot := IDRoot; BrowseInfo.lpszTitle := PChar(title); BrowseInfo.pszDisplayName := @path; BrowseInfo.ulFlags:=BIF_BROWSEFORCOMPUTER; SHBrowseForFolder(BrowseInfo);end;