Mega Code Archive
How to access a certain part of a GUID
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Title: How to access a certain part of a GUID
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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