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Autodeletar uma aplicação

Código

Rotina que permite a aplicação em execução se auto-deletar.

unit RegExpo; 

interface 

uses 

  Windows, Registry, Classes, SysUtils; 

{$I-} 

{$LONGSTRINGS ON}

{ 

Regexpo Author : Arthur Hoornweg (arthur.hoornweg@email.de) 

Version : 1.00, May 1998 

O/S : Windows 95, 98, ME, NT, 2000, XP 

Delphi 2+ 

Function : 

This unit allows you to backup a branch of the registry into a *.REG file, 

that is compatible with "regedit". 

Double-clicking such a file in the explorer will import it. 

Example: 

ExportRegistryBranch(HKEY_LOCAL_MACHINE,'SOFTWARE\Borland\Delphi','A:\DELPHI.REG') (c) 1998 A.M. Hoornweg. All rights reserved. You may use this software for all purposes, both commercial and 

noncommercial, as long as proper credit is given. The sourcecode may be distributed 

freely, as long as this copyright is included and no more than a marginal fee is 

asked. 

Disclaimer: I accept no responsibility whatsoever for any damages caused by these 

routines. Use them at your own risk. If you find any bugs, please let me know. 

} 

procedure ExportRegistryBranch(Rootsection: Integer; regroot: string; FileName: string); 

implementation 

function dblBackSlash(t: string): string; 

var 

  k: longint; 

begin 

  Result := t; {Strings are not allowed to have} 

  for k := Length(t) downto 1 do {single backslashes} 

  if Result[k] = '\' then Insert('\', Result, k); 

end; 

procedure ExportRegistryBranch(rootsection: Integer; Regroot: string; FileName: string); 

var 

  reg: TRegistry; 

  f: Textfile; 

  p: PChar; 

  procedure ProcessBranch(root: string); {recursive sub-procedure} 

  var 

    values, keys: TStringList; 

    i, j, k: longint; 

    s, t: string; {longstrings are on the heap, not on the stack!} 

  begin 

    Writeln(f); {write blank line} 

    case rootsection of 

      HKEY_CLASSES_ROOT: s := 'HKEY_CLASSES_ROOT'; 

      HKEY_CURRENT_USER: s := 'HKEY_CURRENT_USER'; 

      HKEY_LOCAL_MACHINE: s := 'HKEY_LOCAL_MACHINE'; 

      HKEY_USERS: s := 'HKEY_USERS'; 

      HKEY_PERFORMANCE_DATA: s := 'HKEY_PERFORMANCE_DATA'; 

      HKEY_CURRENT_CONFIG: s := 'HKEY_CURRENT_CONFIG'; 

      HKEY_DYN_DATA: s := 'HKEY_DYN_DATA'; 

    end; 

    Writeln(f, '[' + s + '\' + root + ']'); {write section name in brackets}

    reg.OpenKey(root, False); 

    try 

      values := TStringList.Create; 

      try 

        keys := TStringList.Create; 

        try 

          reg.GetValuenames(values); {get all value names} 

          reg.GetKeynames(keys); {get all sub-branches} 

          for i := 0 to values.Count - 1 do {write all the values first} 

          begin 

            s := values[i]; 

            t := s; {s=value name} 

            if s = '' then s := '@' {empty means "default value", write as @}  

               else s := '"' + s + '"'; {else put in quotes} 

            Write(f, dblbackslash(s) + '='); {write the name of the key to the file} 

            case reg.Getdatatype(t) of {What type of data is it?} 

              rdString, rdExpandString: {String-type} 

                Writeln(f, '"' + dblbackslash(reg.ReadString(t) + '"')); 

              rdInteger: {32-bit unsigned long integer} 

                Writeln(f, 'dword:' + IntToHex(reg.readinteger(t), 8)); 

              rdBinary: 

                {write an array of hex bytes if data is "binary." 

                 Perform a line feed after approx. 25 numbers so the line length 

                 stays within limits} 

                begin 

                  Write(f, 'hex:'); 

                  j := reg.GetDataSize(t); {determine size} 

                  GetMem(p, j); {Allocate memory} 

                  reg.ReadBinaryData(t, p^, J); {read in the data, treat as pchar} 

                  for k := 0 to j - 1 do 

                  begin 

                    Write(f, IntToHex(Byte(p[k]), 2)); {Write byte as hex} 

                    if k <> j - 1 then {not yet last byte?} 

                    begin 

                      Write(f, ','); {then write Comma} 

                      if (k > 0) and ((k mod 25) = 0) {line too long?} then 

                      Writeln(f, '\'); {then write Backslash +lf} 

                    end; {if} 

                  end; {for} 

                  FreeMem(p, j); {free the memory} 

                  Writeln(f); {Linefeed} 

                end; 

              else 

                Writeln(f, '""'); {write an empty string if datatype illegal/unknown} 

            end;{case} 

          end; {for} 

        finally 

          reg.CloseKey; 

        end; 

      finally 

        {value names all done, no longer needed} 

        values.Free; 

      end; 

      {Now al values are written, we process all subkeys} 

      {Perform this process RECURSIVELY...} 

      for i := 0 to keys.Count - 1 do 

      ProcessBranch(root + '\' + keys[i]); 

    finally 

      keys.Free; {this branch is ready} 

    end; 

  end; { ProcessBranch} 

  begin 

    if RegRoot[Length(Regroot)] = '\' then {No trailing backslash} 

    SetLength(regroot, Length(Regroot) - 1); 

    Assignfile(f, FileName); {create a text file} 

    Rewrite(f); 

    if ioResult <> 0 then Exit; 

    Writeln(f, 'REGEDIT4'); {"magic key" for regedit} 

    reg := TRegistry.Create; 

    try 

      reg.Rootkey := Rootsection; 

      {Call the function that writes the branch and all subbranches} 

      ProcessBranch(Regroot); 

    finally 

      reg.Free; {ready} 

      Close(f); 

    end; 

  end; 

end.