Bjr à tous,

Après reprise de mon extracteur d'altitude via un service IGN wxs, je constate que TFPHTTPClient fonctionne très bien avec une URL ordinaire. Par contre, dès que j'interroge le service wxs via les méthodes TFPHTTPClient.Get() ou TFPHTTPClient.Post(), le résultat de get() est une chaîne vide, alors que la même URL dans un navigateur me retourne du XML.
Sous Windows: OK , sous Linux: KO

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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unit UnitIGNWebServices;
// Interrogation du serveur d'altimétrie de l'IGN
// pour les altitudes: Z = f(Latitude, Longitude)
// Documentation
// https://geoservices.ign.fr/documentation/services/api-et-services-ogc/calcul-altimetrique-rest
// En GET:
// https://wxs.ign.fr/essentiels/alti/rest/elevation.xml?lon=-0.02500000&lat=43.08600000&zonly=false
// En POST
// https://wxs.ign.fr/essentiels/alti/wps?service=WPS&version=1.0.0
 
{$mode delphi} {$H+}
{$define IGN_DEBUG}
{$define USE_SYNAPSE40}
{$UNDEF USE_SYNAPSE40}
 
 
interface
 
uses
  StructuresDonnees,
  UnitListesSimplesWithGeneriques,
  Classes,
  SysUtils,
  {$IFDEF USE_SYNAPSE40}
  httpsend,
  {$else}
  fphttpclient,
  {$endif}
  DOM,
  XMLRead,   // pour XML
  fpjson,jsonparser    // pour JSON
  ;
// Ne pas oublier les libs OpenSSL à télécharger sur https://indy.fulgan.com/SSL/openssl-1.0.2q-i386-win32.zip
type
 { TMyIGNWebService }
 TMyIGNWebService = class
 
  private
    FPOSTFormData: TStringList;
    FResponse    : TStringList;
    {$IFDEF USE_SYNAPSE40}
    FHTTP : THTTPSend;
    {$else}
    FHTTP : TFPHTTPClient;
    {$endif}
    FListePointsATraiter: TListePointsLatLonAltAcc;
    procedure POST_AddAttributsEntreBalises(const Indent: integer; const K, V: string);
    procedure POST_AddOWSIdentifier(const Indent: integer; const Name: string);
    procedure POST_BeginLiteralData(const Indent: integer);
    procedure POST_BeginWPSAction(const Indent: integer; const WPSAction: string);
    procedure POST_BeginWPSInput(const Indent: integer; const AttribName: string);
    procedure POST_EndLiteralData(const Indent: integer);
    procedure POST_EndWPSAction(const Indent: integer; const WPSAction: string);
    procedure POST_EndWPSInput(const Indent: integer; const AttribName: string);
    function  GetPoint(const Idx: integer): TPointLatLonAltAcc;
    procedure QAfficherMessageErreur(const msg: string); inline;
    procedure ClearAllHeaders();
    procedure ClearAllRequestHeaders();
    procedure AddAHeader(const H, V: string);
    procedure AddARequestHeader(const RH: string);
 
    function  Get(const MyUrl: string): string;
  public
    function  Initialiser(): boolean;
    procedure Finaliser();
    function  GetAltitudeByLatLon(const QLat, QLon: double; out QAltitude, QAccuracy: double): boolean;
    procedure AppendPointByLatLonAlt(const QLat, QLon: double; const QAlt: double; const QAcc: double = 0.00); overload;
    procedure AppendPoint(const P: TPointLatLonAltAcc);
 
 
 
    // Requete POST
    function  POST_BeginListePoints(): boolean;
    function  POST_Flush(): boolean;
    function  POST_TraiterReponseIGN(): boolean;
    function  GetNbPointsExtraits(): integer;
    function  GetPointTraite(const Idx: integer): TPointLatLonAltAcc;
 
    function getNbRequestHeaders(): integer;
end;
 
implementation
 
uses
  DGCDummyUnit,
  Common,
  Forms;
 
const
  ALTITUDE_ERROR            = -9999.0;
  HTTP_ERR_OK               = 200;
 
  HTTP_WWW_OPENGIS_NET      = 'http://www.opengis.net';
  HTTP_SCHEMAS_OPENGIS_NET  = 'http://schemas.opengis.net';
  HTTP_WWW_W3C_ORG          = 'http://www.w3.org';
 
  IGN_WXS  =  'wxs.ign.fr';
  IGN_KEY  =  'essentiels';
  IGN_ALTI =  'alti';
  IGN_REST =  'rest';
  IGN_WPS  =  'wps';
  IGN_WFS  =  'wfs';
  IGN_WCS  =  'wcs';
  IGN_GML  =  'gml';
  IGN_OWS  =  'ows';
  IGN_OGC  =  'ogc';
  IGN_XLINK = 'xlink';
 
  OWS_Identifier  = 'Identifier';
 
  WPS_Input       = 'Input';
  WPS_Data        = 'Data';
  WPS_LiteralData = 'LiteralData';
  WPS_DataInputs  = 'DataInputs';
  WPS_RawDataOutput = 'RawDataOutput';
  WPS_ResponseForm  = 'ResponseForm';
 
 
 
  IGN_SERVICE = 'service=WPS';
  IGN_VERSION = '1.0.0';
 
  IGN_APPLICATION = 'xml';   // xml ou json
  IGN_ELEVATION   = 'elevation.' + IGN_APPLICATION;
 
  XMLNS                      = 'xmlns';
  XML_IGN_SECTION_ELEVATIONS = 'elevations';
  XML_IGN_ELEVATION_ITEM     = 'elevation';
  XML_IGN_LAT                = 'lat';
  XML_IGN_LON                = 'lon';
  XML_IGN_ALT                = 'z';
  XML_IGN_ACCURACY           = 'acc';
 
 
 
{ TMyWebService }
 
procedure TMyIGNWebService.POST_AddAttributsEntreBalises(const Indent: integer; const K, V: string);
begin
  FPOSTFormData.add(format('%s<%s>%s</%s>', [StringOfChar(' ', Indent), K, V, K]));
end;
 
procedure TMyIGNWebService.POST_AddOWSIdentifier(const Indent: integer; const Name: string);
const K = 'ows:Identifier';
begin
  FPOSTFormData.add(format('%s<%s>%s</%s>', [StringOfChar(' ', Indent), K, Name, K]));
end;
 
procedure TMyIGNWebService.POST_BeginWPSAction(const Indent: integer; const WPSAction: string);
begin
  // <wps:DataInputs>
  FPOSTFormData.add(format('%s<wps:%s>', [StringOfChar(' ', Indent), WPSAction]));
end;
procedure TMyIGNWebService.POST_EndWPSAction(const Indent: integer; const WPSAction: string);
begin
  FPOSTFormData.add(format('%s</wps:%s>', [StringOfChar(' ', Indent), WPSAction]));
end;
 
procedure TMyIGNWebService.POST_BeginWPSInput(const Indent: integer; const AttribName: string);
begin
  POST_BeginWPSAction(Indent, WPS_Input);                    // <wps:Input>
    POST_AddOWSIdentifier(Indent + 2, AttribName);         // <ows:Identifier>lon</ows:Identifier>
    POST_BeginWPSAction(Indent + 2, WPS_Data);             // <wps:Data>
 
end;
procedure TMyIGNWebService.POST_EndWPSInput(const Indent: integer; const AttribName: string);
begin
    POST_EndWPSAction(Indent + 2, WPS_Data);                 // </wps:Data>
  POST_EndWPSAction(Indent, WPS_Input);                      // </wps:Input>
end;
procedure TMyIGNWebService.POST_BeginLiteralData(const Indent: integer);
begin
  POST_BeginWPSAction(Indent, WPS_LiteralData);
end;                                                                                                               // <wps:LiteralData>0.2367|2.1570</wps:LiteralData>
procedure TMyIGNWebService.POST_EndLiteralData(const Indent: integer);
begin
  POST_EndWPSAction(Indent, WPS_LiteralData);
end;
 
function TMyIGNWebService.Initialiser(): boolean;
begin
  AfficherMessageErreur(format('%s.Initialiser()', [classname]));
  Result := false;
 
  { SSL initialization has to be done by hand here }
  //InitSSLEAInterface(false);
  FListePointsATraiter := TListePointsLatLonAltAcc.Create;
  FPOSTFormData := TStringList.Create;
  FResponse := TStringList.Create;
  {$IFDEF USE_SYNAPSE40}
  FHTTP := THTTPSend.Create;
  {$else}
  FHTTP := TFPHTTPClient.Create(Application);
  {$endif}
 
  try
    FListePointsATraiter.ClearListe();
    FPOSTFormData.Clear;
    FResponse.Clear;
    self.ClearAllHeaders();
    self.AddAHeader('User-Agent','Mozilla/5.0 (compatible; fpweb)');
    self.AddAHeader('Content-Type',Format('application/%s; charset=UTF-8', [IGN_APPLICATION]));
    self.AddAHeader('Accept', 'application/%s');
    {$IFDEF USE_SYNAPSE40}
    pass;
    {$else}
       FHTTP.AllowRedirect := true;
    {$endif}
    Result := True;
  except
 
  end;
end;
 
 
function TMyIGNWebService.GetAltitudeByLatLon(const QLat, QLon: double; out QAltitude, QAccuracy: double): boolean;
var
  MyURL, QResponse: String;
  MyXML: TXMLDocument;
  LastError, j: integer;
  MyStringStream: TStringStream;
  SectionElevations, MyElevation, QIN: TDOMNode;
  LesElevations, LesAttributs: TDOMNodeList;
  i, Nb, NbAttrs: LongWord;
 
begin
  result := False;
  LastError := 0;
  QResponse := '';
  QAltitude := -6666;
  QAccuracy := 0.00;
  MyXML     := Nil;
  MyURL := Format('https://%s/%s/%s/%s/%s?lon=%.8f&lat=%.8f&zonly=%s',
                 [IGN_WXS, IGN_KEY, IGN_ALTI, IGN_REST, IGN_ELEVATION,
                  QLon, QLat, BoolToStr(false, 'true', 'false')]);
  MyXML := TXMLDocument.Create;
  try // XML
    try
      QResponse := self.Get(MyURL);
      if (trim(QResponse) = '') then
      begin
        QAfficherMessageErreur(format('Reponse vide: "%s"', [QResponse]));
        exit(false);
      end;
    except
      LastError := -1;
    end;
 
    if (LastError <> 0) then exit(false);
    // Création du XML
    QAfficherMessageErreur('-- Creation du XML');
    MyStringStream := TStringStream.Create(QResponse);
    Try //TStringStream
      MyStringStream.Position := 0;
      QAfficherMessageErreur(' -- Parse du XML');
      ReadXMLFile(MyXML, MyStringStream); // Document XML complet
      (*
      <elevations>
         <elevation>
            <lon>-0.025</lon>
            <lat>43.086</lat>
            <z>554.11</z>
            <acc>2.5</acc>
         </elevation>
      </elevations>
      //*)
    Finally
      FreeAndNil(MyStringStream);
    end; // TStringStream
 
    QAfficherMessageErreur(' -- Extraction des data');
    SectionElevations := MyXML.FindNode(XML_IGN_SECTION_ELEVATIONS);
    QAfficherMessageErreur('---- 01: ' + SectionElevations.NodeName);
    if (SectionElevations <> Nil) then
    begin
      LesElevations := SectionElevations.ChildNodes;
      Nb := LesElevations.Count;
      QAfficherMessageErreur(format('-- Section [%s] trouvee: %d items', [XML_IGN_SECTION_ELEVATIONS, Nb]));
      if (Nb > 0) then
      begin
        for i := 0 to Nb - 1 do
        begin
          MyElevation := LesElevations.Item[i];
          // ++ QAfficherMessageErreur(format('%d: %s', [i, MyElevation.NodeName]));
          // attributs de la forme <key>value</key> = ce sont des noeuds
          if (XML_IGN_ELEVATION_ITEM = MyElevation.NodeName) then
          begin
            LesAttributs := MyElevation.ChildNodes;
            QAfficherMessageErreur(format('%d attributs', [LesAttributs.Count]));
            (* +++
            for j := 0 to LesAttributs.Count - 1 do
            begin
              AfficherMessageErreur(Format('  Attr: %d: %s = %s', [j, LesAttributs.Item[j].NodeName, LesAttributs.Item[j].TextContent]));
              //4 attributs
              //Attr: 0: lon = -0.025
              //Attr: 1: lat = 43.086
              //Attr: 2: z = 554.11
              //Attr: 3: acc = 2.5
            end;
            // +++ *)
            QAltitude := ConvertirEnNombreReel(LesAttributs.Item[2].TextContent, 0.00); // Attr: 2: z = 554.11
            QAccuracy := ConvertirEnNombreReel(LesAttributs.Item[3].TextContent, 0.00); // Attr: 3: acc = 2.5
          end;
        end;
      end;
    end;
    Result := true;
  finally // XML
    FreeAndNil(MyXML);
  end;
end;
 
procedure TMyIGNWebService.AppendPointByLatLonAlt(const QLat, QLon: double; const QAlt: double; const QAcc: double = 0.00);
var
  P: TPointLatLonAltAcc;
begin
  P.setFrom(QLat, QLon, QAlt, QAcc);
  FListePointsATraiter.AddElement(P);
end;
 
procedure TMyIGNWebService.AppendPoint(const P: TPointLatLonAltAcc);
begin
  FListePointsATraiter.AddElement(P);
end;
 
//Documentation
// https://geoservices.ign.fr/documentation/services/api-et-services-ogc/calcul-altimetrique-rest
 
function TMyIGNWebService.POST_BeginListePoints(): boolean;
begin
  result := false;
  AfficherMessageErreur(Format('%s.POST_BeginListePoints()', [ClassName]));
  FPOSTFormData.Clear;
  FResponse.Clear;
  //FHttpClient.AddHeader('Content-type', 'text/xml');
  //nb :=
  self.ClearAllRequestHeaders();
  self.AddARequestHeader('User-Agent: Mozilla/5.0 (compatible; fpweb)');
  self.AddARequestHeader('Content-Type:text/xml; charset=UTF-8');
  self.AddARequestHeader('Accept:text/xml');
 
  //FHttpClient.RequestHeaders.Add('Content-type:text/xml');
  //FPOSTFormData.Add('Content-type:text/xml');
  // <?xml version="1.0" encoding="UTF-8"?>
  FPOSTFormData.Add(FormatterVersionEncodageXML('1.0', 'UTF-8'));
  // <wps:Execute version="1.0.0" service="WPS"
  FPOSTFormData.Add(Format('<wps:Execute version="%s" service="%s"', [IGN_VERSION, 'WPS']));
  // xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  FPOSTFormData.Add(Format('  %s:xsi="%s/2001/XMLSchema-instance"', [XMLNS, HTTP_WWW_W3C_ORG]));
  // xmlns="http://www.opengis.net/wps/1.0.0" xmlns:wfs="http://www.opengis.net/wfs"
  FPOSTFormData.Add(Format('  %s="%s/%s/%s" xmlns:%s="%s/%s"', [XMLNS,
                           HTTP_WWW_OPENGIS_NET, IGN_WPS, IGN_VERSION,
                           IGN_WFS, HTTP_WWW_OPENGIS_NET, IGN_WFS]));
  // xmlns:wps="http://www.opengis.net/wps/1.0.0"
  FPOSTFormData.Add(Format('  %s:%s="%s/%s/%s"', [XMLNS,
                           IGN_WPS, HTTP_WWW_OPENGIS_NET, IGN_WPS, IGN_VERSION]));
  //xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:gml="http://www.opengis.net/gml"
  FPOSTFormData.add(Format('  %s:%s="%s/%s/%s" xmlns:%s="%s/%s"', [XMLNS,
                           IGN_OWS, HTTP_WWW_OPENGIS_NET, IGN_OWS, '1.1',
                           IGN_GML, HTTP_WWW_OPENGIS_NET, IGN_GML]));
  // xmlns:ogc="http://www.opengis.net/ogc"
  FPOSTFormData.Add(Format('  %s:%s="%s/%s"', [XMLNS,
                           IGN_OGC, HTTP_WWW_OPENGIS_NET, IGN_OGC]));
  // xmlns:wcs="http://www.opengis.net/wcs/1.1.1" xmlns:%s="%s/1999/xlink"
  FPOSTFormData.add(Format('  %s:%s="%s/%s/%s" xmlns:%s="%s/%d/%s"', [XMLNS,
                           IGN_WCS  , HTTP_WWW_OPENGIS_NET, IGN_WCS, '1.1.1',
                           IGN_XLINK, HTTP_WWW_W3C_ORG, 1999, IGN_XLINK]));
  // xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wps
  FPOSTFormData.Add(Format('  xsi:schemaLocation="%s/%s/%s %s/%s/%s/wpsAll.xsd">', [
                           HTTP_WWW_OPENGIS_NET, IGN_WPS, IGN_VERSION,
                           HTTP_SCHEMAS_OPENGIS_NET, IGN_WPS, IGN_VERSION]));
 
  // Section de données
  POST_AddOWSIdentifier(2, 'gs:WPSLineElevation');  //gs:WPSElevation
  result := True;
end;
function TMyIGNWebService.GetPoint(const Idx: integer): TPointLatLonAltAcc;
begin
  result := FListePointsATraiter.GetElement(Idx);
end;
 
procedure TMyIGNWebService.QAfficherMessageErreur(const msg: string);
begin
  {$ifdef IGN_DEBUG}AfficherMessageErreur('IGNService: ' + msg);{$endif}
end;
 
procedure TMyIGNWebService.ClearAllHeaders();
begin
  {$IFDEF USE_SYNAPSE40}
  FHTTP.Headers.Clear;
  {$else}
  FHTTP.RequestHeaders.Clear;
  {$endif}
end;
 
procedure TMyIGNWebService.ClearAllRequestHeaders();
begin
  {$IFDEF USE_SYNAPSE40}
  {$else}
  FHTTP.RequestHeaders.Clear;
  {$endif}
end;
 
procedure TMyIGNWebService.AddAHeader(const H, V: string);
begin
  {$IFDEF USE_SYNAPSE40}
    FHTTP.Headers.Add(Format('%s:%s', [H, V]));
  {$else}
    FHTTP.AddHeader(H, V);
  {$endif}
end;
 
procedure TMyIGNWebService.AddARequestHeader(const RH: string);
begin
  {$IFDEF USE_SYNAPSE40}
    FHTTP.Headers.Add(RH);
  {$else}
    FHTTP.RequestHeaders.Add(RH);
  {$endif}
end;
 
function TMyIGNWebService.Get(const MyUrl: string): string;
var
  QResults: TStringList;
begin
  result := '';
  {$IFDEF USE_SYNAPSE40}
    QResults := TStringList.Create;
    try
      QResults.Clear;
      if (HttpGetText(MyURL, QResults)) then
      Result := QResults.Text;
    finally
      FreeAndNil(QResults);
    end;
  {$else}
    result := FHTTP.Get(MyURL);
  {$endif}
end;
 
 
function  TMyIGNWebService.POST_Flush(): boolean;
var
  Nb, i: Integer;
  MyURL: String;
  procedure MiouMiou(const Miou: boolean);
  var
    P: TPointLatLonAltAcc;
    EWE, WU: String;
    s: Integer;
  begin
    WU := IIF(Miou, 'lon', 'lat');
    POST_BeginWPSInput(4, WU);    //   <wps:Input>  \n     <ows:Identifier>lon</ows:Identifier>   \n    <wps:Data>
      POST_BeginLiteralData(8);
      EWE := '';
      for s := 0 to Nb-1 do
      begin
        P := self.GetPoint(s);
        if (s > 0) then EWE += '|';
        EWE += FormatterNombreWithDotDecimal(IIF(Miou, P.Longitude, P.Latitude), 8);
        //++ if (Miou) then AfficherMessageErreur(Format('%d: Lat %.8f, Lon = %.8f, Alt = %.3f, Acc = %.3f', [s, P.Latitude, P.Longitude, P.Altitude, P.Accuracy]));
      end;
      FPOSTFormData.Add('        ' + EWE);
      POST_EndLiteralData(8);
    POST_EndWPSInput(4, WU);             //    </wps:Data>    \n    </wps:Input>
  end;
  procedure WPSInputLiteralDataWithOneParameter(const QIndent: integer; const QIdentifier, QParameter: string);
  begin
    POST_BeginWPSInput(QIndent, QIdentifier);
      self.POST_AddAttributsEntreBalises(QIndent + 4, Format('%s:%s', [IGN_WPS, WPS_LiteralData]), QParameter);
    POST_EndWPSInput(QIndent, QIdentifier);
  end;
begin
  result := false;
  Nb := FListePointsATraiter.GetNbElements();
  if (0 = Nb) then exit;
  AfficherMessageErreur(Format('%s.POST_Flush(): %d points', [ClassName, Nb]));
  POST_BeginWPSAction(2, WPS_DataInputs);       // <wps:DataInputs>
    if (Nb > 0) then
    begin
      MiouMiou(true);
      MiouMiou(false);
    end;
    WPSInputLiteralDataWithOneParameter(4, 'sampling', Format('%d', [Nb]));
    WPSInputLiteralDataWithOneParameter(4, 'format', 'json');
    WPSInputLiteralDataWithOneParameter(4, 'indent', 'true');
 
  POST_EndWPSAction(2, WPS_DataInputs);                                  // </wps:DataInputs>
  POST_BeginWPSAction(2, WPS_ResponseForm);                              //   <wps:ResponseForm>
    POST_BeginWPSAction(4, WPS_RawDataOutput);                           //      <wps:RawDataOutput>
      POST_AddAttributsEntreBalises(6, Format('%s.%s', [IGN_OWS, OWS_Identifier]), 'result'); //'ows:Identifier', 'result');    //         <ows:Identifier>result</ows:Identifier>
    POST_EndWPSAction(4, WPS_RawDataOutput);                             //      </wps:RawDataOutput>
  POST_EndWPSAction(2, WPS_ResponseForm);                                //   </wps:ResponseForm>
  POST_EndWPSAction(0, 'Execute');                                       // </wps:Execute>
 
  AfficherMessageErreur('Contenu de la requete POST:');
  MyURL := Format('https://%s/%s/%s/%s?%s&version=%s', [IGN_WXS, IGN_KEY, IGN_ALTI, IGN_WPS, IGN_SERVICE, IGN_VERSION]);
  AfficherMessageErreur('-- Composé par GHTopo  : ' + MyURL);
  AfficherMessageErreur('-- Requis pour le POST : ' + 'https://wxs.ign.fr/essentiels/alti/wps?service=WPS&version=1.0.0'); // En POST
  AfficherMessageErreur('Contenu request headers');
  AfficherMessageErreur('===========================');
  Nb := self.getNbRequestHeaders();
  //++ if (Nb > 0) then for i := 0 to Nb-1 do AfficherMessageErreur(FHTTP.RequestHeaders.Strings[i]);
  //++ AfficherMessageErreur('');
  //++ AfficherMessageErreur('Contenu requête');
  //++ AfficherMessageErreur('===========================');
  //++ for i := 0 to FPOSTFormData.Count - 1 do AfficherMessageErreur(FPOSTFormData.Strings[i]);
  //++ AfficherMessageErreur('===========================');
  {$ifdef USE_SYNAPSE40}
 
  {$else}
  FHTTP.RequestBody := TStringStream.Create(FPOSTFormData.Text); // TRawByteStringStream
  try
    FHTTP.AllowRedirect := true;
    FHTTP.Post(MyURL, FResponse);
    AfficherMessageErreur(Format('-- > %d: "%s"', [FHTTP.ResponseStatusCode, FHTTP.ResponseStatusText]));
    if (FHTTP.ResponseStatusCode <> HTTP_ERR_OK) then exit;
    // Réponse du serveur
    Nb := FResponse.Count;
    //++ AfficherMessageErreur(Format('Code retour du serveur: %d; %d lignes retournees', [FHTTP.ResponseStatusCode, Nb]));
    //++ AfficherMessageErreur('===================');
    //++ for i := 0 to Nb-1 do AfficherMessageErreur(FResponse.Strings[i]);
    //++ AfficherMessageErreur('===================');
    //AfficherMessageErreur('Texte brut: ' + FResponse.Text);
    result := True;
  finally
    FHTTP.RequestBody.Free;
  end;
  {$endif}
 
end;
 
function TMyIGNWebService.POST_TraiterReponseIGN(): boolean;
var
  JsonData, jItem, jSubItem: TJSONData;
  i, j, NbSubItems, NbFields: Integer;
  MyPoint : TPointLatLonAltAcc;
begin
  result := false;
  AfficherMessageErreur(Format('%s.TraiterReponseIGN()', [ClassName]));
  AfficherMessageErreur(FResponse.Text);
  JsonData := GetJSON(FResponse.Text);
  try
    //s := JsonData.AsJSON;
    // ici, on peut virer le contenu de la liste initiale
    // on la recréera lors du parsing de la réponse JSON
    FListePointsATraiter.ClearListe();
    for i := 0 to JsonData.Count - 1 do
    begin
      jItem := JsonData.Items[i];    //++ AfficherMessageErreur(format('JSONItem%d: %s', [i, jItem.AsJSON]));
      NbSubItems := jItem.Count;     //++ AfficherMessageErreur(format('%d subitems', [NbSubItems]));
      if (NbSubItems > 0) then
      begin
        for j := 0 to NbSubItems - 1 do
        begin
          jSubItem := jItem.Items[j];
          NbFields := jSubItem.Count;
          if (NbFields = 4) then
          begin
            MyPoint.Longitude := jSubItem.Items[0].AsFloat;
            MyPoint.Latitude  := jSubItem.Items[1].AsFloat;
            MyPoint.Altitude  := jSubItem.Items[2].AsFloat;
            MyPoint.Accuracy  := jSubItem.Items[3].AsFloat;
            FListePointsATraiter.AddElement(MyPoint);
          end;
        end;
      end; //  if (NbSubItems > 0) then
    end; //  for i := 0 to JsonData.Count - 1 do
  finally
    FreeAndNil(JsonData);  //It's necessary to free jData when you have finished with it. Otherwise a memory leak is created.
  end;
  // Test de sortie: au moins un élément
  result := (FListePointsATraiter.GetNbElements() > 0);
  // contrôle
  AfficherMessageErreur(format('%d points valides', [FListePointsATraiter.GetNbElements()]));
  (*
  for i := 0 to FListePointsATraiter.GetNbElements() - 1 do
  begin
    MyPoint := self.GetPointTraite(i);//self.FListePointsATraiter.GetElement(i);
 
    AfficherMessageErreur(Format('+++ %d: %s', [i, MyPoint.DebugString('')]));
  end;
  //*)
end;
 
function TMyIGNWebService.GetNbPointsExtraits(): integer;
begin
  result := FListePointsATraiter.GetNbElements();
end;
 
function TMyIGNWebService.GetPointTraite(const Idx: integer): TPointLatLonAltAcc;
begin
  result := FListePointsATraiter.GetElement(idx);
end;
 
function TMyIGNWebService.getNbRequestHeaders(): integer;
begin
  {$ifdef USE_SYNAPSE40}
  result := FHTTP.Headers.Count;
  {$else}
  FHTTP.RequestHeaders.Count;
  {$endif}
end;
 
 
procedure TMyIGNWebService.Finaliser();
begin
  try
    FPOSTFormData.Clear;
    FListePointsATraiter.ClearListe();
    FResponse.Clear;
  finally
    FreeAndNil(FListePointsATraiter);
    FreeAndNil(FPOSTFormData);
    FreeAndNil(FResponse);
    FreeAndNil(FHTTP);
  end;
end;
end.