TdxMapControlAzureMapGeolocationProvider.OnResponse Event

Allows you to accept and process responses from an Azure Maps server.

Declaration

delphi

property OnResponse: TdxAzureMapGeolocationProviderOnResponse read; write;

Remarks

Handle the OnResponse event to receive and process responses from an Azure Maps server after an ExecuteAsync procedure call.

Event Occurrence

The OnResponse event occurs every time an Azure Maps server sends a response after an ExecuteAsync procedure call.

Event Parameters

The following parameters are available within an OnResponse event handler:

ASenderProvides access to the TdxMapControlAzureMapGeolocationProvider component that raised the server response event.AResponseProvides access to a container populated with information returned by a server.ADestroyResponse

Specifies if the OnResponse event handler automatically destroys the information container accessible through the AResponse parameter.

If this parameter value is True, the container is destroyed once the application exits the current OnResponse event handler. Otherwise, you need to release the container manually.

Refer to the TdxAzureMapGeolocationProviderOnResponse procedural type description for detailed information on all available options.

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.

Delphi
C++

delphi

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;

cpp

#include "dxAzureMapInformationProviders.hpp" // Declares TdxMapControlAzureMapGeolocationProvider
#include "dxMessageDialog.hpp" // Declares the dxMessageDlg global function
// ...

void __fastcall TMyForm::SendGeolocationQuery(const UnicodeString &AIPAddress)
{
  _di_IdxAzureMapGeolocationQueryParams AQueryParams;
  AQueryParams = dxMapControl1AzureMapGeolocationProvider1->CreateQueryParams();
  AQueryParams->IP = AIPAddress;
  dxMapControl1AzureMapGeolocationProvider1->ExecuteAsync(AQueryParams);
}

void __fastcall TMyForm::dxMapControl1AzureMapGeolocationProviderResponse(
  TdxMapControlAzureMapGeolocationProvider *ASender,
  TdxAzureMapGeolocationRequestResponse *AResponse, bool &ADestroyResponse)
{
  if(AResponse != nullptr)
  {
    if(AResponse->IsSuccess)
    {
      dxMessageDlg("Country Code: " + AResponse->CountryRegion->IsoCode,
        TMsgDlgType::mtInformation, TMsgDlgButtons() << mbOK, 0);
    }
    else if(AResponse->ErrorInfo != nullptr)
    {
      dxMessageDlg(AResponse->ErrorInfo->Message, TMsgDlgType::mtError, TMsgDlgButtons() << mbOK, 0);
    }
  }
}