Keyboard hook probleme

Oui, c'est une vrai plaie.
Je me suis occupée dans le passé d'un projet coriace qui nécessitait l'affichage "texte" de la touche appuyée. ( http://nostromon50onvi.sourceforge.net/)
Je m'en suis sortie comme ceci à l'époque :
1) tu télécharges l'unité créée par Troel Jakobsen qui s'appelle "HotKeyManager". Tu la trouveras ici :http://www.subsimple.com/delphi.asp

2) Dedans, il y a une fonction qui s'appelle HotKeyToText ( function HotKeyToText(aKey: Cardinal): string; )

Et ça s'utilise comme ceci, d'abord une unité qui permet d'enregistrer des macros :

Code:

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{*****************************************************************************
 *
 *  UnitMacrosList.pas - Nostromo N50 Macros Editor (21-November-2008)
 *
 *  Copyright (c) 2008 Wilfrid AVRILLON
 *
 *  Author:     Wilfrid AVRILLON
 *  E-mail:     wilfrid.avrillon@gmail.com
 *  Homepage:   http://sourceforge.net/projects/nostromon50onvi/
 *
 *
 *  This file is part of Nostromo N50 Macros Editor.
 *
 *  Nostromo N50 Macros Editor is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Nostromo N50 Commander is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Nostromo N50 Macros Editor.
 *  If not, see <http://www.gnu.org/licenses/>.
 *
 *----------------------------------------------------------------------------
 *
 *  Revision history:
 *
 *     DATE     REV                 DESCRIPTION
 *  ----------- --- ----------------------------------------------------------
 *
 *  Nov 21 2008 TF  First Release !
 *                  TMacro : Class definition of a macro-command
 *                           (One Macro=one key or one key combination)
 *                  TMacroList : handles a list of TMacro
 *  Dec 18 2008 1.2 Feature : Mouse support
 *****************************************************************************}
 unit UnitMacrosList;
 
interface
uses Sysutils, Classes, Contnrs, StdCtrls;
Type
  TTouche=record
    down:boolean;
    VK_code:word;
  end;
 
  PTTouche = ^TTouche;
 
  TMacro = class(TObject)
  private
    FList:TList;
    FMacroName: string;
    FMacroID: integer;
    function GetItem(Index: Integer): TTouche;
    procedure SetItem(Index: Integer; const Value: TTouche);
    function GetCount: Integer;
    procedure SetCount(const Value: Integer);
    procedure SetMacroName(const Value: string);
    procedure SetMacroID(const Value: integer);
  protected
    procedure SaveToStream(AStream:TStream);
    function LoadFromStream(AStream:TStream):boolean;
  public
    FirstKeyUp,LastKeyDown,IndexUp:integer;
    constructor Create;
    destructor Destroy; override;
    function Add(Item:TTouche): Integer;
    procedure Delete(Index: Integer);
    procedure Insert(Index: Integer; Item: TTouche);
    procedure Move(CurIndex, NewIndex: Integer);
    procedure Exchange(Index1, Index2: Integer);
    procedure Clear;
    procedure ComputeIndexUp;
    function IndexOf(const Value: TTouche): Integer;
    property MacroName:string read FMacroName write SetMacroName;
    Property MacroID:integer read FMacroID write SetMacroID;
    property Items[Index:Integer]:TTouche read GetItem write SetItem;default;
    property Count: Integer read GetCount write SetCount;
  end;
 
  TMacroList = class
  private
    FList: TObjectList;
    FFichier: string;
    FGameApp: string;
    function GetItem(Index: Integer): TMacro;
    function GetCapacity: Integer;
    function GetCount: Integer;
    procedure SetItem(Index: Integer; const Value: TMacro);
    procedure SetCapacity(const Value: Integer);
    procedure SetCount(const Value: Integer);
    function GetOwnsObjects: boolean;
    procedure SetOwnsObjects(const Value: boolean);
    procedure SetFichier(const Value: string);
    procedure SetGameApp(const Value: string);
  protected
    procedure SaveToStream(AStream:TStream);
    function LoadFromStream(AStream:TStream):boolean;
  public
    constructor Create;
    destructor Destroy; override;
    function Add(Item: TMacro): Integer;
    procedure Clear; virtual;
    procedure Delete(Index: Integer);
    procedure Exchange(Index1, Index2: Integer);
    function Expand: TMacroList;
    function Extract(Item: TMacro): TMacro;
    function First: TMacro;
    function IndexOf(Item: TMacro): Integer;
    function IndexOfID(AMacroID:Integer): Integer;
    procedure Insert(Index: Integer; Item: TMacro);
    function Last: TMacro;
    procedure Move(CurIndex, NewIndex: Integer);
    procedure SortByNames;
    function Remove(Item: TMacro): Integer;
    procedure Pack;
    procedure Sort(Compare: TListSortCompare);
    procedure Assign(ListA: TMacroList; AOperator: TListAssignOp = laCopy; ListB: TMacroList = nil);
    property GameApp:string read FGameApp write SetGameApp;
    property Capacity: Integer read GetCapacity write SetCapacity;
    property Count: Integer read GetCount write SetCount;
    property Items[Index: Integer]: TMacro read GetItem write SetItem; default;
    property OwnsObjects: boolean read GetOwnsObjects write SetOwnsObjects;
    property Fichier:string read FFichier write SetFichier;
    function LoadFromFile:boolean;
    procedure SaveToFile;
  end;
implementation
{ TMacro }
 
procedure WriteStreamString(Stream : TStream; UneChaine : string);
var LongueurChaine : integer;
begin
  {obtenir la longueur de la chaîne de caractères}
  LongueurChaine := Length(UneChaine);
  {écrire cette longueur dans le flux}
  Stream.Write(LongueurChaine,SizeOf(integer));
  {écrire les caractères (tous d'un coup !)}
  Stream.Write(UneChaine[1], LongueurChaine);
end;
 
{retourne une chaîne de caractères depuis le flux}
function ReadStreamString(Stream : TStream) : string;
var LongueurChaine : integer;
begin
  {obtenir la longueur de la chaîne de caractères}
  Stream.Read(LongueurChaine,SizeOf(integer));
  {Redimensionner la chaine pour allouer la mémoire nécessaire}
  SetLength(Result, LongueurChaine);
  {Lire les caractères (Tous d'un coup)}
  Stream.Read(Result[1], LongueurChaine);
end;
 
 
function TMacro.Add(Item:TTouche): Integer;
var
  p:PTTouche;
begin
  GetMem(p,SizeOf(Item));
  p^ := Item;
  result := FList.Add(p);
end;
 
procedure TMacro.Clear;
var
  i:integer;
begin
  for i := 0 to FList.Count-1 do FreeMem(FList[i]);
  FList.Clear;
end;
 
procedure TMacro.ComputeIndexUp;
var i:integer;
begin
  FirstKeyUp:=Count;
  LastKeyDown:=0;
  for I := 0 to Count - 1 do
  begin
    if Items[i].down then
    begin
      if (i>LastKeyDown) then LastKeyDown:=i;
    end
    else begin
      if (i<FirstKeyUp) then FirstKeyUp:=i;
    end;
  end;
  if (FirstKeyUp<LastKeyDown)
    then IndexUp:=Count
    else IndexUp:=FirstKeyUp;
end;
 
constructor TMacro.Create;
begin
  FList := TList.Create;
end;
 
procedure TMacro.Delete(Index: Integer);
begin
  FreeMem(FList[Index]);
  FList.Delete(Index);
end;
 
destructor TMacro.Destroy;
begin
  Clear;
  FList.Free;
  inherited;
end;
 
procedure TMacro.Exchange(Index1, Index2: Integer);
begin
  FList.Exchange(Index1, Index2);
end;
 
function TMacro.GetCount: Integer;
begin
  result := FList.Count;
end;
 
function TMacro.GetItem(Index: Integer): TTouche;
begin
  result := PTTouche(FList[Index])^;
end;
 
function TMacro.IndexOf(const Value: TTouche): Integer;
var i: Integer;
    found:Boolean;
    AnItem:TTouche;
begin
  Result := -1;
  found:=False;
  i:=0;
  while ((i<FList.Count) and (not found)) do
  begin
    AnItem:=GetItem(i);
    found:=CompareMem(@Value,@AnItem,SizeOf(TTouche));
    if not found then Inc(i);
  end;
  if found then Result:=i;
end;
 
procedure TMacro.Insert(Index: Integer; Item: TTouche);
var
  p: PTTouche;
begin
  GetMem(p, SizeOf(Item));
  p^ := Item;
  FList.Insert(Index, p);
end;
 
function TMacro.LoadFromStream(AStream: TStream): boolean;
var NbreTouches,i:integer;
    ATouche:TTouche;
begin
  try
    result:=true;
    FMacroName:=ReadStreamString(AStream);
    AStream.Read(FMacroID,sizeof(integer));
    AStream.Read(NbreTouches,sizeof(integer));
    for i := 0 to NbreTouches - 1 do
    begin
      AStream.Read(ATouche,sizeof(TTouche));
      add(Atouche);
    end;
  except
    result:=false;
  end;
end;
 
procedure TMacro.Move(CurIndex, NewIndex: Integer);
begin
  FList.Move(CurIndex, NewIndex);
end;
 
procedure TMacro.SaveToStream(AStream: TStream);
var NbreTouches,i:integer;
    ATouche:TTouche;
begin
  WriteStreamString(AStream,FMacroName);  
  NbreTouches:=Count;
  AStream.Write(FMacroID,SizeOf(integer));
  AStream.Write(NbreTouches,SizeOf(integer));
  for i := 0 to NbreTouches - 1 do
  begin
    Atouche:=Items[i];
    AStream.Write(ATouche,sizeof(TTouche));
  end;
 
end;
 
procedure TMacro.SetCount(const Value: Integer);
var
  i, ListCount: Integer;
  p: PTTouche;
begin
  if FList.Count = Value then
    Exit
  else
  if Value < FList.Count then
  begin
    ListCount := FList.Count;
    for i := ListCount downto Value+1 do
    begin
      FList.Delete(i);
    end;
  end else
  if FList.Count < Value then
  begin
    for i := FList.Count+1 to Value do
    begin
      GetMem(p, SizeOf(TTouche));
      FillChar(p^, SizeOf(TTouche), 0);
      FList.Add(p);
    end;
  end;
end;
 
procedure TMacro.SetItem(Index: Integer; const Value: TTouche);
begin
  PTTouche(FList[Index])^ := value;
end;
 
procedure TMacro.SetMacroID(const Value: integer);
begin
  FMacroID := Value;
end;
 
procedure TMacro.SetMacroName(const Value: string);
begin
  FMacroName := Value;
end;
 
{ TMacroList }
function TMacroList.Add(Item: TMacro): Integer;
var AnID:integer;
begin
  AnID:=0;
  while IndexOfID(AnID)<>-1 do inc(AnID);
  Item.MacroID:=AnID;
  Result := FList.Add(Item);
end;
 
procedure TMacroList.Assign(ListA: TMacroList; AOperator: TListAssignOp;
  ListB: TMacroList);
begin
  if ListB <> nil then
    FList.Assign(ListA.FList, AOperator, ListB.FList) else
    FList.Assign(ListA.FList);
end;
 
procedure TMacroList.Clear;
begin
  FList.Clear;
end;
 
constructor TMacroList.Create;
begin
  FList := TObjectList.Create;
end;
 
procedure TMacroList.Delete(Index: Integer);
begin
  FList.Delete(Index);
end;
 
destructor TMacroList.Destroy;
begin
  FList.Free;
  inherited;
end;
 
procedure TMacroList.Exchange(Index1, Index2: Integer);
begin
  FList.Exchange(Index1, Index2);
end;
 
function TMacroList.Expand: TMacroList;
begin
  Result := TMacroList(FList.Expand);
end;
 
function TMacroList.Extract(Item: TMacro): TMacro;
begin
  Result := Extract(Item);
end;
 
function TMacroList.First: TMacro;
begin
  Result := TMacro(FList.First);
end;
 
function TMacroList.GetItem(Index: Integer): TMacro;
begin
  Result := TObject(FList[Index]) as TMacro;
end;
 
function TMacroList.GetCapacity: Integer;
begin
  Result := FList.Capacity;
end;
 
function TMacroList.GetCount: Integer;
begin
  Result := FList.Count;
end;
 
function TMacroList.IndexOf(Item: TMacro): Integer;
begin
  Result := FList.IndexOf(Item);
end;
 
function TMacroList.IndexOfID(AMacroID: Integer): Integer;
begin
  Result := 0;
  while (Result < Count) and (Items[Result].MacroID <> AMacroID) do
    Inc(Result);
  if Result = Count then
    Result := -1;
end;
 
procedure TMacroList.Insert(Index: Integer; Item: TMacro);
begin
  FList.Insert(Index, Item);
end;
 
function TMacroList.Last: TMacro;
begin
  Result := TMacro(FList.Last);
end;
 
function TMacroList.LoadFromFile:boolean;
var AFS:TFileStream;
begin
  result:=false;
  if not FileExists(Fichier) then exit;
  AFS:=TFileStream.Create(Fichier,fmOpenRead);
  try
    result:=LoadFromStream(AFS);
  finally
    AFS.Free;
  end;
end;
 
function TMacroList.LoadFromStream(AStream: TStream):boolean;
var nbreMacros,i:integer;
    AMacro:TMacro;
begin
  try
    result:=true;
    Clear;
    FGameApp:=ReadStreamString(AStream);
    AStream.Read(nbreMacros,SizeOf(integer));
    for i:=0 to nbreMacros-1 do
    begin
      AMacro:=TMacro.Create;
      AMacro.LoadFromStream(AStream);
      Add(AMacro);
    end;
  except
    result:=false;
  end;
end;
 
procedure TMacroList.Move(CurIndex, NewIndex: Integer);
begin
  FList.Move(CurIndex, NewIndex);
end;
 
procedure TMacroList.Pack;
begin
  FList.Pack;
end;
 
procedure TMacroList.SetItem(Index: Integer; const Value: TMacro);
begin
  FList.Items[Index] := Value;
end;
 
function TMacroList.Remove(Item: TMacro): Integer;
begin
  Result := FList.Remove(Item);
end;
 
procedure TMacroList.SaveToFile;
var AFS:TFileStream;
begin
  SortByNames;
  if FileExists(FFichier) then DeleteFile(fichier);
  AFS:=TFileStream.Create(Fichier,fmCreate);
  try
    SaveToStream(AFS);
  finally
    AFS.Free;
  end;
end;
 
procedure TMacroList.SaveToStream(AStream: TStream);
var nbreMacros,i:integer;
    AMacro:TMacro;
begin
  WriteStreamString(AStream,FGameApp);
  nbreMacros:=Count;
  AStream.Write(nbreMacros,SizeOf(integer));
  for i:=0 to nbreMacros-1 do
  begin
    AMacro:=Items[i];
    AMacro.SaveToStream(AStream);
  end;
end;
 
procedure TMacroList.SetCapacity(const Value: Integer);
begin
  FList.Capacity := Value;
end;
 
procedure TMacroList.SetCount(const Value: Integer);
begin
  FList.Count := Value;
end;
 
procedure TMacroList.SetFichier(const Value: string);
begin
  FFichier := Value;
end;
 
procedure TMacroList.SetGameApp(const Value: string);
begin
  FGameApp := Value;
end;
 
procedure TMacroList.Sort(Compare: TListSortCompare);
begin
  FList.Sort(Compare);
end;
 
 
function TMacroList.GetOwnsObjects: boolean;
begin
  Result := FList.OwnsObjects;
end;
 
procedure TMacroList.SetOwnsObjects(const Value: boolean);
begin
  FList.OwnsObjects := Value;
end;
 
procedure TMacroList.SortByNames;
function CompareNames(Item1, Item2: Pointer): Integer;
begin
  Result := CompareText(TMacro(Item1).MacroName, TMacro(Item2).MacroName);
end;
begin
  Sort(@CompareNames);
end;
 
end.

Vas-y, tu peux utiliser sans crainte tu as l'autorisation de l'auteur. C'est sous licence GPL3, donc tu dois normalement garder l'en-tête et me citer (mais je m'en fiche, donc :zoubi: )

Ensuite, tu peux utiliser ça comme ça, par exemple (une TListBox, 2 TSpeedButton (un pour commencer à "lire" le clavier, l'autre pour arrêter).
:

Code:

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unit UnitMain;
 
interface
 
uses
  ...,HotKeyManager;
type
  TMainForm = class(TForm)           
    sb_start: TSpeedButton;
    sb_Stop: TSpeedButton;   
    LB_Touches: TListBox;
    ImageList1: TImageList; // TimageList avec deux glyphes, une flèche vers le haut, une vers le bas
    procedure sb_startClick(Sender: TObject);
    procedure sb_StopClick(Sender: TObject);
    procedure FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
    procedure FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);   
    procedure LB_TouchesMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure LB_TouchesMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
   procedure LB_TouchesDrawItem(Control: TWinControl; Index: Integer;
      Rect: TRect; State: TOwnerDrawState);
 
  private
    { Déclarations privées }
    FIsrecording: boolean;
    OldTouche:TTouche;
    CurrentMacro: integer;
    { Private declarations }
    procedure UpdateTouchesList;
       procedure SetIsrecording(const Value: boolean);    
    property Isrecording:boolean read FIsrecording write SetIsrecording;    
  public
    { Déclarations publiques }
    MacroList:TMacroList;
    procedure UpdateMacroList;    
  end;
 
procedure TMainForm.FormCreate(Sender: TObject);
var AMacro:TMacro;
begin
  MacroList:=TMacroList.Create;
  AMacro:=TMacro.Create;
 AMacro.MacroName:='New Macro';
 CurrentMacro:=MacroList.Add(AMacro);
end;
 
procedure TMainForm.FormDestroy(Sender: TObject);
begin
  MacroList.Free;
end;
 
procedure TMainForm.sb_startClick(Sender: TObject);
begin  
  Isrecording:=true;
end;
 
procedure TMainForm.sb_StopClick(Sender: TObject);
begin
  Isrecording:=false;  
end;
 
procedure TMainForm.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var ATouche:TTouche;
begin  
  ATouche.down:=true;
  ATouche.VK_code:=Key;
//ça, c'est pour contourener le problême de répétition automatique des touches :
  if (Isrecording and not((OldTouche.VK_code=ATouche.VK_code)  
      and (OldTouche.down=ATouche.down))) then
  begin
    OldTouche:=ATouche;
    MacroList.Items[CurrentMacro].Add(ATouche);
    UpdateTouchesList;
    Key := 0;
  end;
end;
 
procedure TMainForm.FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
var ATouche:TTouche;
begin 
  ATouche.down:=false;
  ATouche.VK_code:=Key;
//ça, c'est pour contourener le problême de répétition automatique des touches :
  if (Isrecording and not((OldTouche.VK_code=ATouche.VK_code)
      and (OldTouche.down=ATouche.down))) then
  begin
    OldTouche:=ATouche;
    MacroList.Items[CurrentMacro].Add(ATouche);
    UpdateTouchesList;
    Key := 0;
  end;
end;
 
 
//La souris peut aussi être considérée comme un clavier ;)
procedure TMainForm.LB_TouchesMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var ATouche:TTouche;
begin 
  ATouche.down:=true;
  case Button of
    mbLeft:ATouche.VK_code:=VK_LBUTTON;
    mbRight:ATouche.VK_code:=VK_RBUTTON;
    mbMiddle:ATouche.VK_code:=VK_MBUTTON;
  end;
 
  if (Isrecording and not((OldTouche.VK_code=ATouche.VK_code)
      and (OldTouche.down=ATouche.down))) then
  begin
    OldTouche:=ATouche;
    MacroList.Items[CurrentMacro].Add(ATouche);
    UpdateTouchesList;
  end;
end;
 
procedure TMainForm.LB_TouchesMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var ATouche:TTouche;
begin 
  ATouche.down:=false;
  case Button of
    mbLeft:ATouche.VK_code:=VK_LBUTTON;
    mbRight:ATouche.VK_code:=VK_RBUTTON;
    mbMiddle:ATouche.VK_code:=VK_MBUTTON;
  end;
  if (Isrecording and not((OldTouche.VK_code=ATouche.VK_code)
      and (OldTouche.down=ATouche.down))) then
  begin
    OldTouche:=ATouche;
    MacroList.Items[CurrentMacro].Add(ATouche);
    UpdateTouchesList;
  end;
end;
 
procedure TMainForm.LB_TouchesDrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
var
  Offset: Integer;      { text offset width }
  AMacro:TMacro;
  ATouche:TTouche;
begin  
  AMAcro:=MacroList.Items[CurrentMacro];
  if index>(AMAcro.Count-1)
  then exit;
  ATouche:=AMAcro.Items[index];
  with (Control as TListBox).Canvas do  { draw on control canvas, not on the form }
  begin
    if (AMacro.IndexUp=-1) then Brush.Color:=clWhite;
    if (Index<AMacro.indexup) then Brush.Color:=clSkyBlue
                            else Brush.Color:=clMoneyGreen;
 
    FillRect(Rect);       { clear the rectangle }
    Offset := 2;          { provide default offset }
 
    if ATouche.down
    then ImageList1.Draw((Control as TListBox).Canvas,Rect.Left + Offset, Rect.Top+2,0,true)
    else ImageList1.Draw((Control as TListBox).Canvas,Rect.Left + Offset, Rect.Top+2,1,true);
 
    Offset := ImageList1.Width + 6;    { add four pixels between bitmap and text}
    TextOut(Rect.Left + Offset, Rect.Top+2, (Control as TListBox).Items[Index])  { display the text }
  end;
end;
 
procedure TMainForm.UpdateTouchesList;
var i:Integer;
     ATouche:TTouche;
     Name:string; 
     AMacro:TMacro;
begin  
  LB_Touches.Items.BeginUpdate;
  LB_Touches.Clear;
  AMAcro:=MacroList.Items[CurrentMacro];
  AMacro.ComputeIndexUp;
  for i := 0 to AMAcro.Count - 1 do
  begin
    ATouche:=AMAcro.Items[i];
    case ATouche.VK_code of
    VK_LBUTTON:Name:='Mouse Left';
    VK_RBUTTON:Name:='Mouse Right';
    VK_MBUTTON:Name:='Mouse Middle';
    else Name:=HotKeyToText(GetHotKey(0,ATouche.VK_code),true);
    end;
 
    LB_Touches.Items.Add(Name);
  end;
  LB_Touches.Items.EndUpdate;
 
end;
 
procedure TMainForm.SetIsrecording(const Value: boolean);
begin
  if FIsrecording<>value then
  begin
     FIsrecording := Value;     
     sb_Stop.Enabled:=FIsrecording;
     sb_start.Enabled:=not FIsrecording;     
     OldTouche.VK_code:=0;
     LB_Touches.SetFocus;
  end;
end;
 
 
end.

C'est compliqué, mais ça marche (normalement :aie:)