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| unit UnitRecord;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;
type
Tenregistrement=class
private
Champs:TStringList;
Offsets:array of integer;
FEnregistrement: string;
function GetOffset(Nom:string):integer; overload;
function GetLength(Nom:string):byte; overload;
function GetOffset(Index:integer):integer; overload;
function GetLength(Index:integer):byte; overload;
function GetValue(Index:integer):ShortString;
procedure MAJOffsets;
procedure SetEnregistrement(const Value: string);
public
constructor Create;
destructor Destroy;
procedure Clear;
procedure AddField(Nom:string;Longueur:byte);
procedure RemoveField(Nom:string); overload;
procedure RemoveField(Index:integer); overload;
function GetFieldValue(Nom:string):ShortString; overload;
function GetFieldValue(index:integer):ShortString; overload;
procedure SetFieldValue(Nom:string;NewValue:shortString); overload;
procedure SetFieldValue(Index:integer;NewValue:shortString); overload;
function GetFieldName(Index:integer):string;
function GetFieldIndex(Nom:string):integer;
function GetFieldLength(Nom:string):byte; overload;
function GetFieldLength(index:integer):byte; overload;
procedure SetFieldLength(Nom:string;NewLength:byte); overload;
procedure SetFieldLength(Index:integer;NewLength:byte); overload;
procedure RenameField(AncienNom,NouveauNom:string);
procedure LoadFieldDefinitions(NomFichier:string);
procedure SaveFieldDefinitions(NomFichier:string);
procedure MoveToRecord(var Dest;Size:integer);
property Enregistrement:string read FEnregistrement write SetEnregistrement;
end;
implementation
{ Tenregistrement }
procedure Tenregistrement.AddField(Nom: string; Longueur: byte);
var i:integer;
begin
i:=Champs.IndexOfName(Nom);
if i>0 then begin
ShowMessage('Ce champ à déjà été défini');
exit;
end;
i:=Champs.Add(Nom+'='+IntToStr(Longueur));
SetLength(Offsets,Champs.Count);
if i=0 then begin
Offsets[0]:=0;
SetLength(FEnregistrement,Longueur);
end
else begin
Offsets[i]:=Offsets[i-1]+StrToInt(Champs.ValueFromIndex[i-1]);
SetLength(FEnregistrement,Offsets[i]+Longueur);
end;
end;
constructor Tenregistrement.Create;
begin
Champs:=TStringList.Create;
Champs.Clear;
end;
destructor Tenregistrement.Destroy;
begin
Champs.Clear;
Champs.Free;
end;
function Tenregistrement.GetFieldIndex(Nom: string): integer;
begin
Result:=Champs.IndexOfName(Nom);
end;
function Tenregistrement.GetFieldLength(Nom: string): byte;
begin
Result:=GetLength(Nom);
end;
function Tenregistrement.GetFieldName(Index: integer): string;
begin
Result:=Champs.Names[Index];
end;
function Tenregistrement.GetLength(Nom: string): byte;
begin
Result:=GetLength(Nom);
end;
function Tenregistrement.GetValue(Index: integer): ShortString;
begin
result:=Copy(FEnregistrement,GetOffset(index)+1,GetLength(index));
end;
function Tenregistrement.GetOffset(Nom: string): integer;
begin
Result:=GetOffset(Champs.IndexOfName(Nom));
end;
function Tenregistrement.GetOffset(Index: integer): integer;
begin
Result:=Offsets[index];
end;
procedure Tenregistrement.LoadFieldDefinitions(NomFichier: string);
begin
Champs.LoadFromFile(NomFichier);
MAJOffsets;
end;
procedure Tenregistrement.MAJOffsets;
var i:integer;
OldLength,NewLength,LastIndex:integer;
begin
SetLength(Offsets,Champs.Count);
if Champs.Count>0 then
begin
Offsets[0]:=0;
i:=1;
while i<Champs.Count do
begin
Offsets[i]:=Offsets[i-1]+StrToInt(Champs.ValueFromIndex[i-1]);
Inc(i);
end;
end;
OldLength:=Length(FEnregistrement);
LastIndex:=Champs.Count-1;
if LastIndex>-1
then NewLength:=Offsets[LastIndex]+StrToInt(Champs.ValueFromIndex[LastIndex])
else NewLength:=0;
SetLength(FEnregistrement,NewLength);
if NewLength>OldLength then
for i:=OldLength to NewLength do
FEnregistrement[i]:=' ';
end;
procedure Tenregistrement.RemoveField(Index: integer);
begin
Champs.Delete(index);
MAJOffsets;
end;
procedure Tenregistrement.RemoveField(Nom: string);
begin
RemoveField(Champs.IndexOfName(Nom));
end;
procedure Tenregistrement.RenameField(AncienNom, NouveauNom: string);
var i:integer;
begin
i:=Champs.IndexOf(NouveauNom);
if i<>-1 then begin
ShowMessage('Le champ '+NouveauNom+' existe déjà !');
exit;
end;
i:=Champs.IndexOf(AncienNom);
if i=-1 then begin
ShowMessage('Le champ '+AncienNom+' n''existe pas !');
exit;
end;
Champs.Strings[i]:=NouveauNom+'='+Champs.ValueFromIndex[i];
end;
procedure Tenregistrement.SaveFieldDefinitions(NomFichier: string);
begin
Champs.SaveToFile(NomFichier);
end;
procedure Tenregistrement.SetEnregistrement(const Value: string);
var i,CountMax:integer;
begin
CountMax:=Length(FEnregistrement);
if Length(Value)<CountMax then CountMax:=Length(Value);
i:=1;
while i<=CountMax do
begin
FEnregistrement[i]:=Value[i];
Inc(i);
end;
CountMax:=Length(FEnregistrement);
while i<=CountMax do
begin
FEnregistrement[i]:=' ';
Inc(i);
end;
end;
procedure Tenregistrement.SetFieldLength(Nom: string; NewLength: byte);
begin
Champs.Values[Nom]:=IntToStr(NewLength);
MAJOffsets;
end;
procedure Tenregistrement.SetFieldValue(Nom: string;
NewValue: shortString);
begin
SetFieldValue(Champs.IndexOfName(Nom),NewValue);
end;
function Tenregistrement.GetLength(Index: integer): byte;
begin
Result:=StrToInt(Champs.ValueFromIndex[Index]);
end;
function Tenregistrement.GetFieldLength(index: integer): byte;
begin
result:=GetLength(index);
end;
function Tenregistrement.GetFieldValue(index: integer): ShortString;
begin
Result:=Trim(GetValue(index));
end;
procedure Tenregistrement.SetFieldLength(Index:integer; NewLength: byte);
begin
Champs.ValueFromIndex[Index]:=IntToStr(NewLength);
MAJOffsets;
end;
procedure Tenregistrement.SetFieldValue(Index: integer;
NewValue: shortString);
var i,j,LNewValue,LChamp:integer;
begin
i:=1;
j:=OffSets[index]+1;
LNewValue:=Length(NewValue);
LChamp:=GetLength(Index);
while ((i<=LNewValue) and (i<=LChamp)) do
begin
FEnregistrement[j]:=NewValue[i];
Inc(i);
Inc(j);
end;
while (i<=LChamp) do
begin
FEnregistrement[j]:=' ';
Inc(i);
Inc(j);
end;
end;
function Tenregistrement.GetFieldValue(Nom: string): ShortString;
begin
result:=GetFieldValue(Champs.IndexOfName(Nom));
end;
procedure Tenregistrement.Clear;
begin
Champs.Clear;
SetLength(Offsets,0);
end;
procedure Tenregistrement.MoveToRecord(var Dest;Size:integer);
var i:integer;
LongueurChamp:byte;
Buffer:array of Byte;
CurrentOffset:integer;
S:ShortString;
SizeOfBuffer:integer;
MaxSize:integer;
begin
if ((Length(FEnregistrement)=0) or (Champs.Count=0)) then exit;
SizeOfBuffer:=Length(FEnregistrement)+Champs.Count;
if (Size<SizeOfBuffer) then exit;
SetLength(Buffer,Length(FEnregistrement)+Champs.Count);
CurrentOffset:=0;
for i:=0 to Champs.Count-1 do
begin
LongueurChamp:=GetLength(i);
S:=GetFieldValue(i);
move(LongueurChamp,Buffer[CurrentOffset],1);
Inc(CurrentOffset);
move(S[1],Buffer[CurrentOffset],LongueurChamp);
Inc(CurrentOffset,LongueurChamp);
end;
move(buffer[0],Dest,Size);
end;
end. |
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