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TdxMapControlAzureMapGeolocationProvider.ExecuteAsync(IdxAzureMapQueryParams) Method

Sends an asynchronous query to an Azure Maps server.

#Declaration

Delphi
procedure ExecuteAsync(const AParams: IdxAzureMapQueryParams);

#Parameters

Name Type Description
AParams IdxAzureMapQueryParams

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 geolocation query to an Azure Maps server. To cancel pending asynchronous queries, call the CancelRequest 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 Country ISO Code by IP Address Asynchronously

The code example in this section demonstrates a procedure that sends a query to an Azure Maps Geolocation server and an OnResponse event handler that receives and processes the server response.

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

procedure TMyForm.SendGeolocationQuery(const AIPAddress: string);
var
  AQueryParams: IdxAzureMapGeolocationQueryParams;
begin
  AQueryParams := dxMapControl1AzureMapGeolocationProvider1.CreateQueryParams;
  AQueryParams.IP := AIPAddress;
  dxMapControl1AzureMapGeolocationProvider1.ExecuteAsync(AQueryParams);
end;

procedure TMyForm.dxMapControl1AzureMapGeolocationProvider1Response(
  ASender: TdxMapControlAzureMapGeolocationProvider;
  AResponse: TdxAzureMapGeolocationRequestResponse; var ADestroyResponse: Boolean);
begin
  if AResponse <> nil then
  begin
    if AResponse.IsSuccess then
      dxMessageDlg('Country Code: ' + AResponse.CountryRegion.IsoCode, TMsgDlgType.mtInformation, [mbOK], 0);
    else if Assigned(AResponse.ErrorInfo) then
      dxMessageDlg(AResponse.ErrorInfo.Message, TMsgDlgType.mtError, [mbOK], 0);
  end;
end;
See Also