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TdxMapControlAzureMapGeocodeProvider.ExecuteAsync(IdxAzureMapGeocodeQueryParams) Method

Sends an asynchronous query to an Azure Maps server.

#Declaration

Delphi
procedure ExecuteAsync(const AParams: IdxAzureMapGeocodeQueryParams);

#Parameters

Name Type Description
AParams IdxAzureMapGeocodeQueryParams

Accepts a configured query parameters container.

Call the CreateQueryParams function to create a query parameters container.

#Remarks

Call the ExecuteAsync procedure to send an asynchronous geocode query to an Azure Maps server. To cancel pending asynchronous queries, call the CancelRequests procedure.

#Receive Server Responses to Asynchronous Queries

Handle the OnResponse event to receive and process a server query after an ExecuteAsync procedure call.

#Code Example: Obtain Point Coordinates by Address Asynchronously

The code example in this section demonstrates a procedure that sends a query to an Azure Maps Geocode server and an OnResponse event handler that receives and processes the server response. The event handler uses an existing map layer to draw a pushpin at the obtained point coordinates if the query is successful.

uses
  dxAzureMapInformationProviders,  // Declares TdxMapControlAzureMapGeocodeProvider
  dxMessageDialog;  // Declares the dxMessageDlg global function
// ...

procedure TMyForm.SendGeocodeQuery(const AAddress: string);
var
  AQueryParams: IdxAzureMapGeocodeQueryParams;
begin
  AQueryParams := dxMapControl1AzureMapGeocodeProvider1.CreateQueryParams;
  AQueryParams.Query := AAddress;
  dxMapControl1AzureMapGeocodeProvider1.ExecuteAsync(AQueryParams);
end;

procedure TMyForm.dxMapControl1AzureMapGeocodeProvider1Response(
  ASender: TdxMapControlAzureMapGeocodeProvider;
  AResponse: TdxAzureMapGeocodeRequestResponse; var ADestroyResponse: Boolean);
var
  APushpin: TdxMapPushpin;
begin
  if AResponse <> nil then
  begin
    if AResponse.IsSuccess then  // Creates a pushpin at the obtained position if the query is successful
    begin
      APushpin := dxMapControl1ItemLayer1.MapItems.Add(TdxMapPushpin) as TdxMapPushpin;
      APushpin.Location.GeoPoint.Longitude := AResponse.Features.First.Geometry.Coordinates[0];
      APushpin.Location.GeoPoint.Latitude := AResponse.Features.First.Geometry.Coordinates[1];
    end
    else if Assigned(AResponse.ErrorInfo) then
      dxMessageDlg(AResponse.ErrorInfo.Message, TMsgDlgType.mtError, [mbOK], 0);
  end;
end;
See Also