vcl-dxazuremapinformationproviders-8fba207f.md
The base class for Azure Maps information providers.
TdxMapControlAzureMapInformationProvider = class abstract(TdxMapControlInformationProvider)
Information providers complement the tile data provider and allow you to display additional map-related information, such as routes and addresses.
To use Microsoft Azure Maps® services, you need to create an Azure Maps account and obtain a key. Assign the account key to the AzureKey property to configure the information provider.
The list below outlines key members of the TdxMapControlAzureMapInformationProvider class. These members allow you to configure the Azure map information provider.
AzureKey Required. Specifies the account key required to use the Azure Maps information provider.CancelRequestsCancels pending asynchronous requests to Microsoft Azure servers.
The following code example implements a procedure that accepts an Azure Maps account key, and creates and configures all Azure Maps information provider components:
uses
dxAzureMapInformationProviders; // Declares all Azure Maps information provider classes
// ...
procedure TMyForm.CreateAzureMapsInformationProviders(const AAzureKey: string);
var
AProviders: TdxMapControlInformationProviders;
AProvider: TdxMapControlAzureMapInformationProvider;
I: Integer;
begin
AProviders := dxMapControl1.InformationProviders;
AProviders.BeginUpdate; // Initiates the following batch change
try
// Create all Azure Maps information providers
AProviders.Add(TdxMapControlAzureMapGeocodeProvider);
AProviders.Add(TdxMapControlAzureMapGeolocationProvider);
AProviders.Add(TdxMapControlAzureMapReverseGeocodeProvider);
AProviders.Add(TdxMapControlAzureMapRouteProvider);
for I := 0 to AProviders.Count - 1 do // Iterates through all created information providers
begin
AProvider := AProviders.Items[I] as TdxMapControlAzureMapInformationProvider;
AProvider.AzureKey := AAzureKey; // Assigns the same Azure Maps account key to all providers
end;
finally
AProviders.EndUpdate; // Calls EndUpdate regardless of the batch operation's success
end;
end;
#include "dxAzureMapInformationProviders.hpp" // Declares all Azure Maps information provider classes
// ...
void __fastcall TMyForm::CreateAzureMapsInformationProviders(const UnicodeString &AAzureKey)
{
TdxMapControlInformationProviders *AProviders;
TdxMapControlAzureMapInformationProvider *AProvider;
AProviders = dxMapControl1->InformationProviders;
AProviders->BeginUpdate(); // Initiates the following batch change
try
{
// Create all Azure Maps information providers
AProviders->Add(__classid(TdxMapControlAzureMapGeocodeProvider));
AProviders->Add(__classid(TdxMapControlAzureMapGeolocationProvider));
AProviders->Add(__classid(TdxMapControlAzureMapReverseGeocodeProvider));
AProviders->Add(__classid(TdxMapControlAzureMapRouteProvider));
for(int i = 0; i < AProviders->Count; i++) // Iterates through all created information providers
{
AProvider = dynamic_cast<TdxMapControlAzureMapInformationProvider*>(AProviders->Items[i]);
AProvider->AzureKey = AAzureKey; // Assigns the same Azure Maps account key to all providers
}
}
__finally
{
AProviders->EndUpdate(); // Calls EndUpdate regardless of the batch operation's success
}
}
Do not use the TdxMapControlAzureMapInformationProvider class directly. Use the following descendants instead:
TdxMapControlAzureMapGeocodeProviderAn Azure Maps Geocode information provider.TdxMapControlAzureMapGeolocationProviderAn Azure Maps Geolocation information provider.TdxMapControlAzureMapReverseGeocodeProviderAn Azure Maps Reverse Geocode information provider.TdxMapControlAzureMapRouteProviderAn Azure Maps Route information provider.
To see Microsoft Azure Map tile and information providers in action, run the Mapping demo in the VCL Demo Center installed with compiled DevExpress demos. When the demo is opened, it downloads tile data and additional information from Azure Map servers to display a map and build routes between specified points.
Tip
Compiled DevExpress demos ship with source code installed in the Public Documents folder (%Public%) for all users ( default ). You can find all project and source code files for the Map Control demo in the following folder:
%Public%\Documents\DevExpress VCL Demos\MegaDemos\Product Demos\ExpressMapControl
TObject TPersistent TComponent TcxCustomComponent TcxComponentCollectionItem TdxMapControlInformationProvider TdxMapControlAzureMapInformationProvider
See Also
TdxMapControlAzureMapImageryDataProvider Class