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TMS VCL WebGMaps
How to get the address at right click on the map and put a marker on this address

You can use the OnMapClick event to catch a mouse click on the map. Then use the TWebGMapsReverseGeocoding component to retrieve the address based on the Latitude and Longitude coordinates and add a marker with the Markers.Add() call.

Example:

procedure TForm8.WebGMaps1MapClick(Sender: TObject; Latitude, Longitude: Double;
  X, Y: Integer; Button: TMouseButton);
begin
  WebGMapsReverseGeocoding1.Latitude := Latitude;
  WebGMapsReverseGeocoding1.Longitude := Longitude;

  if WebGMapsReverseGeocoding1.LaunchReverseGeocoding = erOk then
    WebGMaps1.Markers.Add(Latitude, Longitude, WebGMapsReverseGeocoding1.ResultAddress.FormattedAddress);
end;