Delphi / Pascal : Intégration de page html dans les ressources d'une dll

Description

Juste un outil permettant de créer/modifier des dll de ressources dans le but de stocker des fichiers html/css/js et images(jpeg, gif, png, ...). La dll peut ensuite être utilisée dans n'importe quel programme avec un TWebBrowser ou un TembeddedWB.
Les composants suivants sont nécessaires pour compiler le programme :
- TembeddedWB : http://sourceforge.net/projects/embeddedwb/
- spTbxLib : http://www.silverpointdevelopment.com/
- VitualTreeView : http://www.soft-gems.net/
- synedit : http://sourceforge.net/projects/synedit/
Un executable est présent dans l'archive pour tester le programme.
Source / Exemple :

unit F_HTMLRes;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, SpTBXItem, SpTBXSkins, SpTBXTabs, SpTBXControls,
  OleCtrls, SHDocVw_EWB, EwbCore, EmbeddedWB, U_HtmlResURL,
  StdCtrls, SpTBXEditors, SpTBXDkPanels, TB2Dock, TB2Toolbar, TB2Item, Mask,
  rxToolEdit, TntDialogs, VirtualTrees, SynEdit, SynHighlighterCss,
  SynHighlighterHtml, SynEditHighlighter, SynHighlighterJScript,
  cyFlyingContainer, EIGToolBox, ActnList;

type
  pReadRES = ^TReadRES;
  TReadRES = packed record
    ResID   : integer;
    ResName : AnsiString;
    ResType : AnsiString;
  end;

  pTabReadRES = ^TTabReadRES;
  TTabReadRES = array of TReadRES;

  TFrm_HTMLRes = class(TForm)
    pgc_main: TSpTBXTabControl;
    pg_first: TSpTBXTabItem;
    pg_Proj: TSpTBXTabItem;
    SpTBXTabSheet1: TSpTBXTabSheet;
    SpTBXPanel2: TSpTBXPanel;
    page_projet: TSpTBXTabSheet;
    SpTBXPanel3: TSpTBXPanel;
    edt_DLL: TSpTBXButtonEdit;
    SpTBXLabel1: TSpTBXLabel;
    SpTBXDockablePanel1: TSpTBXDockablePanel;
    WB: TEmbeddedWB;
    OpenD: TOpenDialog;
    SpTBXPanel1: TSpTBXPanel;
    VST: TVirtualStringTree;
    SpTBXSplitter1: TSpTBXSplitter;
    pgc_read: TSpTBXTabControl;
    pg_readHTML: TSpTBXTabItem;
    pg_html: TSpTBXTabSheet;
    SpTBXPanel4: TSpTBXPanel;
    WB_read: TEmbeddedWB;
    SpTBXTabItem1: TSpTBXTabItem;
    pg_text: TSpTBXTabSheet;
    SpTBXPanel5: TSpTBXPanel;
    SynJScript: TSynJScriptSyn;
    SynHTML: TSynHTMLSyn;
    SynCss: TSynCssSyn;
    SynEditRes: TSynEdit;
    SpTBXPanel6: TSpTBXPanel;
    pg_tools1: TSpTBXTabItem;
    SpTBXTabSheet3: TSpTBXTabSheet;
    pnl_editSyn: TSpTBXDockablePanel;
    item_resName: TSpTBXItem;
    SpTBXPanel7: TSpTBXPanel;
    SynEdit_mod: TSynEdit;
    bt_valid: TSpTBXButton;
    SpTBXButton2: TSpTBXButton;
    Fly_Edit: TcyFlyingContainer;
    SpTBXToolbar1: TSpTBXToolbar;
    SpTBXItem1: TSpTBXItem;
    SpTBXItem2: TSpTBXItem;
    SpTBXItem3: TSpTBXItem;
    TBSeparatorItem1: TTBSeparatorItem;
    TBSeparatorItem2: TTBSeparatorItem;
    ActionList1: TActionList;
    act_ajouter: TAction;
    act_modifier: TAction;
    act_supprimer: TAction;
    OpenNew: TOpenDialog;
    pnl_NewRES: TSpTBXPanel;
    edt_Alias: TSpTBXEdit;
    edt_SRCNew: TSpTBXButtonEdit;
    Source: TSpTBXLabel;
    Alias: TSpTBXLabel;
    SpTBXLabel2: TSpTBXLabel;
    Lab_Alias: TSpTBXLabel;
    SpTBXLabel4: TSpTBXLabel;
    SpTBXButton1: TSpTBXButton;
    SpTBXButton3: TSpTBXButton;
    Fly_NewRES: TcyFlyingContainer;
    SpTBXButton4: TSpTBXButton;
    SaveDLL: TSaveDialog;
    procedure SpTBXButton4Click(Sender: TObject);
    procedure SpTBXButton1Click(Sender: TObject);
    procedure edt_AliasChange(Sender: TObject);
    procedure edt_AliasKeyPress(Sender: TObject; var Key: Char);
    procedure edt_SRCNewSubEditButton0Click(Sender: TObject);
    procedure SpTBXButton3Click(Sender: TObject);
    procedure act_supprimerExecute(Sender: TObject);
    procedure act_modifierExecute(Sender: TObject);
    procedure act_ajouterExecute(Sender: TObject);
    procedure bt_validClick(Sender: TObject);
    procedure SpTBXButton2Click(Sender: TObject);
    procedure VSTDblClick(Sender: TObject);
    procedure SynEditResDblClick(Sender: TObject);
    procedure VSTFocusChanged(Sender: TBaseVirtualTree; Node: PVirtualNode;
      Column: TColumnIndex);
    procedure VSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
      Column: TColumnIndex; TextType: TVSTTextType; var CellText: WideString);
    procedure VSTGetNodeDataSize(Sender: TBaseVirtualTree;
      var NodeDataSize: Integer);
    procedure edt_DLLSubEditButton0Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    sCopyFile : string;
    lib_DLL : THandle;
    pReads : pTabReadRES;
    SelectedNode : PVirtualNode;
    procedure readRessourcesFromFile(afile : string);
    procedure doEditSynActive;
    procedure DoUpdateRESText;
    procedure doUpdateRESBin;
    procedure doMakeAlias;
    procedure DoMakeRealAlias;
    procedure CreateNewDLL(aFileName : string);
    function  dofindRessource(aName : string) : Boolean;
  public
    constructor Create(aOwner : TComponent);override;
    destructor Destroy;override;
  end;

var
  Frm_HTMLRes: TFrm_HTMLRes;

implementation

{$R *.dfm}
{$Resource DLL.res}

const
  rt_html = MakeIntResource(23);

Function _FormaterCode(Chaine : string; Upper : Boolean = true) : string;
Var	Tmp	:	String;
		Tmp2	:	String;
     P		:	Integer;
Begin
	if Upper then Tmp2 := UpperCase(trim(Chaine))
  else tmp2 := trim(Chaine);
	For p := 1 To Length(Tmp2) Do
  	Begin
			Case Tmp2[P] Of
        	'a' .. 'z', 'A' .. 'Z', '0' .. '9', '_': Tmp := Tmp + Tmp2[P];
        end;
     End;
	Result := Tmp;
End;

Function StockResourceType(restype: PChar): string;
const
  restypenames: Array [1..23] of String =
    ( 'RT_CURSOR',
      'RT_BITMAP',
      'RT_ICON',
      'RT_MENU',
      'RT_DIALOG',
      'RT_STRING',
      'RT_FONTDIR',
      'RT_FONT',
      'RT_ACCELERATOR',
      'RT_RCDATA',
      'RT_MESSAGETABLE',
      'RT_GROUP_CURSOR',
      'UNKNOWN',
      'RT_GROUP_ICON',
      'UNKNOWN',
      'RT_VERSION',
      'RT_DLGINCLUDE',
      'UNKNOWN',
      'RT_PLUGPLAY',
      'RT_VXD',
      'RT_ANICURSOR',
      'RT_ANIICON',

      'RT_HTML'        // MakeIntResource(23);
    );
var
  resid: Cardinal absolute restype;
begin
  if resid in [1..23] then
    Result := restypenames[resid]
  else
    Result := 'UNKNOWN';
end;

function enumResNamesProc(module: HMODULE; restype, resname: PChar;
  ptab : pTabReadRES): Integer; stdcall;
var i : integer;
begin
  if HiWord(Cardinal(resname)) <> 0 then begin
    i := length(pTab^); inc(i); setLength(pTab^, i); dec(i);
    pTab^[i].ResType := StockResourceType(restype);
    pTab^[i].ResName := resname;
    pTab^[i].ResID := 1;
  end
  else begin
    i := length(pTab^); inc(i); setLength(pTab^, i); dec(i);
    pTab^[i].ResType := StockResourceType(restype);
    pTab^[i].ResName := Format('  #%d', [loword(Cardinal(resname))]);
    pTab^[i].ResID := 1;
  end;
  Result := 1;

end;

function enumResTypesProc(module: HMODULE; restype: PChar; ptab : pTabReadRES): Integer; stdcall;
begin
  if StockResourcetype(restype) = 'RT_HTML' then begin
    EnumResourceNames(module, restype, @enumResNamesProc, Integer(pTab));
  end;
  Result := 1;
end;

{ TFrm_HTMLRes }

procedure TFrm_HTMLRes.act_ajouterExecute(Sender: TObject);
begin
  if lib_Dll = 0 then
    raise exception.Create('Pas de fichier de ressource chargé');

  edt_Alias.Text := '';
  edt_SRCNew.Text := '';
  Lab_Alias.Caption := '';

  Fly_NewRES.Control := pnl_NewRES;
  Fly_NewRES.Execute(foMainCenter);
end;

procedure TFrm_HTMLRes.act_modifierExecute(Sender: TObject);
begin
//
end;

procedure TFrm_HTMLRes.act_supprimerExecute(Sender: TObject);
var N : PVirtualNode;
    p : pReadRES;

    HUpdate: THandle;
    sName : string;
    frCode : Longword;
begin
  N := VST.FocusedNode;
  if N = nil then Exit;
  p := pReadRES(VST.GetNodeData(N)^);

  if MessageDlg('Supprimer la ressource "' + p^.ResName + '" ?', mtConfirmation, [mbYes, mbNo], 1)=mrNo then Exit; 

  frCode := (SUBLANG_FRENCH shl 10) or LANG_FRENCH;
  sName := p^.ResName;

  FreeLibrary(lib_DLL);
  try
    HUpdate := BeginUpdateResource(pAnsiChar(sCopyFile), FALSE);
    if Hupdate = 0 then
      Raise exception.Create(Format('Impossible de mettre à jour la ressource : %8.8x', [GetLastError]));
    try
      UpdateResource(HUpdate, rt_html, pansiChar(sName), frCode, nil, 0);
    finally
      EndUpdateResource(HUpdate, FALSE);
    end;
  finally
    if FileExists(edt_DLL.Text) then
      DeleteFile(edt_DLL.Text);
    CopyFileOperation(sCopyFile, edt_DLL.Text);

    Lib_Dll := LoadLibrary(pansiChar(sCopyFile));
    VST.DeleteNode(N);
  end;
  
end;

procedure TFrm_HTMLRes.bt_validClick(Sender: TObject);
begin
  DoUpdateRESText;
  VSTFocusChanged(VST, SelectedNode, 0);
  Fly_Edit.Close(mrOk);
end;

constructor TFrm_HTMLRes.Create(aOwner: TComponent);
begin
  inherited create(aOwner);
  New(pReads);
  SetLength(pReads^, 0);

  sCopyFile := IncludeTrailingPathDelimiter(ExtractFilePath(Application.ExeName)) + 'WorkDLL.dll';
end;

procedure TFrm_HTMLRes.CreateNewDLL(aFileName: string);
var RS : TResourceStream;
begin
  if FileExists(aFileName) then DeleteFile(aFileName);
  RS := TResourceStream.Create(HInstance, 'DLL_VIDE', RT_RCDATA);
  try
    RS.SaveToFile(aFileName);
  finally
    RS.Free;
  end;
  if FileExists(aFileName) then begin
    edt_DLL.Text := aFileName;
    readRessourcesFromFile(aFileName);
  end;
end;

destructor TFrm_HTMLRes.Destroy;
begin
  dispose(pReads);
  if lib_DLL <> 0 then FreeLibrary(lib_DLL);
  if FileExists(sCopyFile) then DeleteFile(sCopyFile);
  inherited Destroy;
end;

procedure TFrm_HTMLRes.doEditSynActive;
var pt : TPoint;
    N : PVirtualNode;
    p : pReadRES;
begin
  if Fly_Edit.Active then Exit;
  pnl_editSyn.Height := (Screen.Height div 10) * 9;
  pnl_editSyn.Width := Screen.Width - 20;

  Fly_Edit.Control := pnl_editSyn;
  SynEdit_mod.Highlighter := SynEditRes.Highlighter;
  SynEdit_mod.Lines.text := SynEditRes.Lines.Text;

  N := VST.FocusedNode;
  p := pReadRES(VST.GetNodeData(N)^);
  item_resName.Caption := p^.ResName;
  SelectedNode := N;

  pt := point(screen.MonitorFromWindow(Self.Handle).Left + 10,
              screen.MonitorFromWindow(Self.Handle).Top + 5);
  Fly_Edit.Execute(pt);
end;

function TFrm_HTMLRes.dofindRessource(aName: string): Boolean;
var N : PVirtualNode;
    p : pReadRES;
begin
  result := False;
  N := VST.GetFirst;
  while N <> nil do begin
    p := pReadRES(VST.GetNodeData(N)^);
    if p^.ResID = 1 then begin
      if UpperCase(trim(p^.ResName)) = uppercase(trim(aName)) then begin
        Result := true;
        break;
      end;
    end;
    N := VST.GetNext(N);
  end;
end;

procedure TFrm_HTMLRes.doMakeAlias;
var sExt : string;
begin
  if trim(edt_SRCNew.Text) = '' then begin
    edt_Alias.text := '';
    Lab_Alias.Caption := '';
    exit;
  end;

  sExt := ExtractFileExt(edt_SRCNew.Text);
  if trim(edt_SRCNew.Text) <> '' then begin
    edt_Alias.Text := _FormaterCode(StringReplace(ExtractFileName(edt_SRCNew.Text), sExt, '', []), true);
  end;
  DoMakeRealAlias;
end;

procedure TFrm_HTMLRes.DoMakeRealAlias;
var sExt : string;
begin
  sExt := ExtractFileExt(edt_SRCNew.Text);
  
  sExt := UpperCase(sExt);
  if sExt = '.CSS' then Lab_Alias.Caption := 'CSS_' + edt_Alias.Text
  else if sExt = '.JS'   then Lab_Alias.Caption := 'JS_'   + edt_Alias.Text
  else if sExt = '.JPEG' then Lab_Alias.Caption := 'IMG_'  + edt_Alias.Text
  else if sExt = '.JPG'  then Lab_Alias.Caption := 'IMG_'  + edt_Alias.Text
  else if sExt = '.BMP'  then Lab_Alias.Caption := 'IMG_'  + edt_Alias.Text
  else if sExt = '.GIF'  then Lab_Alias.Caption := 'IMG_'  + edt_Alias.Text
  else if sExt = '.PNG'  then Lab_Alias.Caption := 'IMG_'  + edt_Alias.Text
  else Lab_Alias.Caption := edt_Alias.Text;
end;

procedure TFrm_HTMLRes.doUpdateRESBin;
var HUpdate: THandle;
    sName : string;
    frCode : Longword;
    si : Cardinal;
    f  : file;
    p : pChar;
begin
  frCode := (SUBLANG_FRENCH shl 10) or LANG_FRENCH;
  sName := Lab_Alias.Caption;

  AssignFile(f, edt_SRCNew.Text);
  reset(f, 1);
  FreeLibrary(lib_DLL);
  try
    HUpdate := BeginUpdateResource(pAnsiChar(sCopyFile), FALSE);
    if Hupdate = 0 then
      Raise exception.Create(Format('Impossible de mettre à jour la ressource : %8.8x', [GetLastError]));
    try
      si := FileSize(f);
      GetMem(p, si);
      BlockRead(f, p^, si);
      UpdateResource(HUpdate, rt_html, pansiChar(sName), frCode, p, si);
      FreeMem(p);
    finally
      EndUpdateResource(HUpdate, FALSE);
    end;
  finally
    CloseFile(f);
    if FileExists(edt_DLL.Text) then
      DeleteFile(edt_DLL.Text);
    CopyFileOperation(sCopyFile, edt_DLL.Text);

    Lib_Dll := LoadLibrary(pansiChar(sCopyFile));
  end;
end;

procedure TFrm_HTMLRes.DoUpdateRESText;
var HUpdate: THandle;
    sName : string;
    frCode : Longword;
    si : Cardinal;
    sValue : string;

begin
  frCode := (SUBLANG_FRENCH shl 10) or LANG_FRENCH;
  sName := item_resName.Caption;

  FreeLibrary(lib_DLL);
  try
    HUpdate := BeginUpdateResource(pAnsiChar(sCopyFile), FALSE);
    if Hupdate = 0 then
      Raise exception.Create(Format('Impossible de mettre à jour la ressource : %8.8x', [GetLastError]));
    try
      sValue := SynEdit_mod.lines.text;
      si := length(sValue);
      UpdateResource(HUpdate, rt_html, pansiChar(sName), frCode, pChar(sValue), si);
    finally
      EndUpdateResource(HUpdate, FALSE);
    end;
  finally
    if FileExists(edt_DLL.Text) then
      DeleteFile(edt_DLL.Text);
    CopyFileOperation(sCopyFile, edt_DLL.Text);

    Lib_Dll := LoadLibrary(pansiChar(sCopyFile));
  end;
end;

procedure TFrm_HTMLRes.edt_AliasChange(Sender: TObject);
begin
  DoMakeRealAlias;
end;

procedure TFrm_HTMLRes.edt_AliasKeyPress(Sender: TObject; var Key: Char);
begin
   case Key of
     'a' .. 'z', 'A' .. 'Z', '0' .. '9', '_', #37, #39, #46, #8 : exit;
     else Key := #0;
   end;
end;

procedure TFrm_HTMLRes.edt_DLLSubEditButton0Click(Sender: TObject);
begin
  if OpenD.Execute(HInstance) then begin
    edt_DLL.Text := OpenD.FileName;
    readRessourcesFromFile(OpenD.FileName);
  end;
end;

procedure TFrm_HTMLRes.edt_SRCNewSubEditButton0Click(Sender: TObject);
begin
  if OpenNew.Execute then begin
    edt_SRCNew.Text := OpenNew.FileName;
    doMakeAlias;
  end;
end;

procedure TFrm_HTMLRes.FormShow(Sender: TObject);
begin
  if SkinManager.SkinsList.IndexOf('EIG')>=0 then
    SkinManager.SetSkin('EIG')
  else SkinManager.SetSkin('Leopard');

  pgc_main.ActivePage := page_projet;
  pgc_main.TabVisible := False;
end;

procedure TFrm_HTMLRes.readRessourcesFromFile(afile: string);
var i : integer;
    Ni, Nh, Nc, Nj : PVirtualNode;
    sBak : string;
begin
  if Not FileExists(aFile) then Exit;
  if lib_DLL <> 0 then FreeLibrary(lib_DLL);

  if FileExists(sCopyFile) then
    DeleteFile(sCopyFile);
  CopyFileOperation(aFile, sCopyFile);

  sBak := aFile + '.Bak';
  if FileExists(sBak) then DeleteFile(sBak);
  CopyFileOperation(aFile, sBak);

  lib_DLL := LoadLibrary(pansiChar(sCopyFile));

  VST.BeginUpdate;
  try
    SetLength(pReads^, 0);
    VST.clear;

    SetLength(pReads^, 4);

    if not EnumResourceTypes(lib_DLL, @enumResTypesProc, integer(pReads)) then
      MessageDlg(Format('Lecture des ressources= %8.8x', [GetLastError]), mtError, [mbok], 0)
    else begin

      pReads^[0].ResID := 0;
      pReads^[0].ResName := 'IMAGES';
      pReads^[0].ResType := 'RT_IMAG';
      Ni := VST.AddChild(nil, @pReads^[0]);
      pReads^[1].ResID := 0;
      pReads^[1].ResName := 'CSS';
      pReads^[1].ResType := 'RT_CSS';
      Nc := VST.AddChild(nil, @pReads^[1]);
      pReads^[2].ResID := 0;
      pReads^[2].ResName := 'JAVA SCRIPT';
      pReads^[2].ResType := 'RT_JS';
      Nj := VST.AddChild(nil, @pReads^[2]);
      pReads^[3].ResID := 0;
      pReads^[3].ResName := 'HTML';
      pReads^[3].ResType := 'RT_HTML';
      Nh := VST.AddChild(nil, @pReads^[3]);

      for i := low(pReads^) to High(pReads^) do begin
        if pReads^[i].ResID = 1 then begin
          if pos('IMG_', pReads^[i].ResName)=1 then
            VST.AddChild(Ni, @pReads^[i])
          else if pos('CSS_', pReads^[i].ResName)=1 then
            VST.AddChild(Nc, @pReads^[i])
          else if pos('JS_', pReads^[i].ResName)=1 then
            VST.AddChild(Nj, @pReads^[i])
          else
            VST.AddChild(Nh, @pReads^[i]);
        end;
      end;
    end;
    
  finally
    VST.EndUpdate;
  end;

end;

procedure TFrm_HTMLRes.SpTBXButton1Click(Sender: TObject);
begin
  if not FileExists(edt_SRCNew.text) then Exit;
  if trim(Lab_Alias.Caption) = '' then Exit;

  if dofindRessource(Lab_Alias.Caption) then
    raise exception.Create('Une ressource portant ce nom existe déja');

  doUpdateRESBin;
  readRessourcesFromFile(edt_DLL.Text);
  Fly_NewRES.Close;
end;

procedure TFrm_HTMLRes.SpTBXButton2Click(Sender: TObject);
begin
  Fly_Edit.Close;
end;

procedure TFrm_HTMLRes.SpTBXButton3Click(Sender: TObject);
begin
  Fly_NewRES.Close;
end;

procedure TFrm_HTMLRes.SpTBXButton4Click(Sender: TObject);
begin

  if SaveDLL.Execute then
    CreateNewDLL(SaveDLL.FileName);
end;

procedure TFrm_HTMLRes.SynEditResDblClick(Sender: TObject);
begin
  doEditSynActive;
end;

procedure TFrm_HTMLRes.VSTDblClick(Sender: TObject);
begin
  if SynEditRes.lines.Count > 0 then
    doEditSynActive;
end;

procedure TFrm_HTMLRes.VSTFocusChanged(Sender: TBaseVirtualTree;
  Node: PVirtualNode; Column: TColumnIndex);
var p : pReadRES;
    s, sName : string;
    m : TMemoryStream;

  procedure InitSynEditHtml;
  var HResInfo: HRSRC;
      HGlobal: THandle;
      buffer : PChar;
  begin
    HResInfo := FindResource(Lib_DLL, pChar(sName), rt_html);
    HGlobal := LoadResource(lib_dll, HResInfo);
    try
      if HGlobal <> 0 then begin
        buffer := LockResource(HGlobal);
        M.WriteBuffer(buffer[0], SizeOfResource(lib_DLL, HResInfo));
        UnlockResource(HGlobal);
        M.Seek(0, soFromBeginning);
        SynEditRes.Lines.LoadFromStream(M);
      end;
    finally
      FreeResource(HGlobal);
    end;
  end;

begin
  if node = nil then begin
    act_modifier.Enabled  := False;
    act_supprimer.Enabled := False;
    Exit;
  end;
  if lib_DLL = 0 then Exit;
  p := pReadRES(VST.GetNodeData(Node)^);
  sName := p^.ResName;

  act_modifier.Enabled  := True;
  act_supprimer.Enabled := True;

  SynEditRes.lines.Text := '';

  m := TMemoryStream.Create;
  try
    if p^.ResID = 1 then begin
      if pos('CSS_', sName)=1 then begin
        WB_read.go('about:blank');
        pgc_read.ActivePage := pg_text;
        SynEditRes.Highlighter := SynCss;
        InitSynEditHtml;
      end
      else if pos('JS_', sName)=1 then begin
        WB_read.go(MakeResourceURL(Lib_DLL, pansichar(sName), rt_html));
        pgc_read.ActivePage := pg_text;
        SynEditRes.Highlighter := SynJScript;
        SynEditRes.Lines.Text := WB_read.DocumentSource;
        InitSynEditHtml;
      end
      else if pos('IMG_', sName)=1 then begin
        SynEditRes.Highlighter := SynHTML;
        SynEditRes.lines.Text := '';
        WB_read.go(MakeResourceURL(Lib_DLL, pansichar(sName), rt_html));
        pgc_read.ActivePage := pg_html;
      end
      else begin
        s := MakeResourceURL(Lib_DLL, pansichar(sName), rt_html);
        WB_read.go(s);
        pgc_read.ActivePage := pg_html;
        SynEditRes.Highlighter := SynHTML;
        SynEditRes.Lines.Text := WB_read.DocumentSource;
        InitSynEditHtml;
      end
    end
    else begin
      WB_read.go('about:blank');
      pgc_read.ActivePage := pg_html;
    end;
  finally
    m.free;
  end;

end;

procedure TFrm_HTMLRes.VSTGetNodeDataSize(Sender: TBaseVirtualTree;
  var NodeDataSize: Integer);
begin
  NodeDataSize := 4;
end;

procedure TFrm_HTMLRes.VSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
  Column: TColumnIndex; TextType: TVSTTextType; var CellText: WideString);
var p : pReadRES;
begin
  p := pReadRES(VST.GetNodeData(Node)^);

  Celltext := p^.ResName;
end;

end.

//---------------------------------------------------------------------------------------------------------

unit U_HtmlResURL;

interface
uses 
  SysUtils,
  Classes,
  Windows;

  function URLEncode(const S: string): string;
  function FormatResNameOrType(ResID: PChar): string;
  function MakeResourceURL(const ModuleName: string; const ResName: PChar;
                           const ResType: PChar = nil): string; overload;
  function MakeResourceURL(const Module: HMODULE; const ResName: PChar;
                           const ResType: PChar = nil): string; overload;
  function MakeResourceHTML(const Module: HMODULE; const ResName: PChar): string; 

implementation
var _Lib_HTML : THandle;

function URLEncode(const S: string): string;
var
  Idx: Integer;
begin
  Result := '';
  for Idx := 1 to Length(S) do
  begin
    {$IFDEF UNICODE}
    if CharInSet(S[Idx], ['A'..'Z', 'a'..'z', '0'..'9', '-', '_', '.']) then
    {$ELSE}
    if S[Idx] in ['A'..'Z', 'a'..'z', '0'..'9', '-', '_', '.'] then
    {$ENDIF}
      Result := Result + S[Idx]
    else
      Result := Result + '%' + IntToHex(Ord(S[Idx]), 2);
  end;
end;

function FormatResNameOrType(ResID: PChar): string;
begin
  if HiWord(LongWord(ResID)) = 0 then
    // high word = 0 => numeric resource id
    // numeric value is stored in low word
    Result := Format('#%d', [LoWord(LongWord(ResID))])
  else
    // high word <> 0 => string value
    // PChar is implicitly converted to string
    Result := ResID;
end;

function MakeResourceURL(const ModuleName: string; const ResName: PChar;
  const ResType: PChar = nil): string; overload;
begin
  Assert(ModuleName <> '');
  Assert(Assigned(ResName));
  Result := 'res://' + URLEncode(ModuleName);
  if Assigned(ResType) then
    Result := Result + '/' + URLEncode(FormatResNameOrType(ResType));
  Result := Result + '/' + URLEncode(FormatResNameOrType(ResName));
end;

function MakeResourceURL(const Module: HMODULE; const ResName: PChar;
  const ResType: PChar = nil): string; overload;
begin
  Result := MakeResourceURL(GetModuleName(Module), ResName, ResType);
end;

function MakeResourceHTML(const Module: HMODULE; const ResName: PChar): string;
const
  RT_HTML = MakeIntResource(23);
begin
  Result := MakeResourceURL(GetModuleName(Module), ResName, RT_HTML);
end;

end.
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