Получить доступ в определенной части GUID

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Code:

{ Manchmal wird nur ein Teil einer GUID benotigt.... }

{ You maybe have to access  just a part of a GUID. }

 

 

{ Const for the function Format(...) }

const

  fsGUID: string = 'D1: $%s'#13#10'D2: $%s'#13#10'D3: $%s'#13#10     +

    'D4: $%s $%s $%s $%s $%s $%s $%s $%s';

  fsGUIDParts: string = 'D%d:%s';

 

  // Type for the GUID part to be shown

type

 

  TGUIDPART = (guidp_NoFormat, guidp_All, guidp_D1,

    guidp_D2, guidp_D3, guidp_D4);

 

{ This GUIDToStringEx function give you the full GUID string

according with then format string FStr (you can change it !!!) }

function GUIDToStringEx(Guid: TGuid; FStr: string): string; overload;

begin

  Result := Format(FStr,

    [IntToHex(GUID.D1, 8),

    IntToHex(GUID.D2, 4),

    IntToHex(GUID.D3, 4),

    IntToHex(GUID.D4[0], 2),

    IntToHex(GUID.D4[1], 2),

    IntToHex(GUID.D4[2], 2),

    IntToHex(GUID.D4[3], 2),

    IntToHex(GUID.D4[4], 2),

    IntToHex(GUID.D4[5], 2),

    IntToHex(GUID.D4[6], 2),

    IntToHex(GUID.D4[7], 2)

    ]);

end;

 

{ This GUIDToStringEx function give you the part of the GUID

to be shown, according to the part type GUIDPart }

function GUIDToStringEx(Guid: TGuid; Part: TGUIDPART): string; overload;

var

  i: Integer;

  S: string;

begin

  S := '';

  case Part of

    guidp_NoFormat: S := GUIDToString(Guid);

    guidp_All:      S := GUIDToStringEx(Guid, fsGUID);

    guidp_D1:       S := Format(fsGUIDParts, [1, ' $' + IntToHex(GUID.D1, 8)]);

    guidp_D2:       S := Format(fsGUIDParts, [2, ' $' + IntToHex(GUID.D2, 4)]);

    guidp_D3:       S := Format(fsGUIDParts, [3, ' $' + IntToHex(GUID.D3, 4)]);

    guidp_D4:

       begin

        for i := 0 to 7 do S := S + ' $' + IntToHex(GUID.D4[i], 2);

        S := Format(fsGUIDParts, [4, S]);

      end;

    else

       S := '?';

  end;

  Result := S;

end;

 

{ How to use the different GUIDToStringEx functions }

 

procedure TForm1.Button1Click(Sender: TObject);

var

  NewGUID: TGUID;

begin

  { Create a new GUID }

  NewGUID := StringToGUID(CreateClassID);

 

  { Standard formated GUID string }

  label1.Caption := GUIDToStringEx(NewGUID, guidp_NoFormat) +

    #13#10+

 

   { Full formated GUID string acc. with fsGUID}

    GUIDToStringEx(NewGUID, fsGUID) +

    #13#10+

 

   { Full formated GUID string with default formating}

    GUIDToStringEx(NewGUID, guidp_All) +

    #13#10+

 

   { Part D3 of the GUID only }

    GUIDToStringEx(NewGUID, guidp_D3);

end;

 

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