program CheckCRC;

uses
  Forms, Registry, Dialogs, Windows, SysUtils,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.RES}
var Reg: TRegistry;
begin
  Application.Initialize;
  Reg:=TRegistry.Create;
  Reg.RootKey:= HKEY_LOCAL_MACHINE;
  if ParamStr(1)='/uninstall' then begin
   Reg.DeleteKey('\SOFTWARE\Classes\*\shell\CRC32');
   Reg.DeleteKey('\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\CheckCRC');
   MessageDlg('You must manually delete ' + ParamStr(0) +
              ' to remove CheckCRC completely from your system.'
   ,mtWarning,[mbOK],0);
   Reg.CloseKey;
   Reg.Free;
   Exit;
  end;
  if Reg.OpenKey('\SOFTWARE\Classes\*\shell\CRC32\command',True) then
      Reg.WriteString('','"' + ParamStr(0) + '" "%1"');
  if Reg.OpenKey
     ('\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\CheckCRC',True) then
    begin
     Reg.WriteString('DisplayName','CRC32 Calculator - CheckCRC');
     Reg.WriteString('UninstallString',ParamStr(0) + ' /uninstall');
    end;
  Reg.CloseKey;
  Reg.Free;
  Application.CreateForm(TForm1, Form1);
  Form1.Show;
  if (ParamCount > 0) and FileExists(ParamStr(1)) then
       Form1.AnalyzeFile(ParamStr(1));
  Application.Run;
end.