To find the coordinates (latitude and longitude) of a location in Delphi, you can use a geocoding service that converts a physical address or place name into geographic coordinates.
One way to do this is to use the Google Maps Geocoding API, which allows you to programmatically retrieve the latitude and longitude for a given address or place name. To use the Google Maps Geocoding API, you will need to sign up for a Google Cloud Platform account and obtain an API key.
Here is an example of how you can use the Google Maps Geocoding API in Delphi to find the coordinates of a location:
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uses System.Net.HttpClient, System.Net.URLClient; function GetCoordinates(address: string; var lat, lon: Double): Boolean; var apiKey: string; url: string; response: string; client: THttpClient; stream: TMemoryStream; reader: TStreamReader; begin Result := False; apiKey := ‘YOUR_API_KEY’; url := Format(‘https://maps.googleapis.com/maps/api/geocode/json?address=%s&key=%s’, [THttpClient.URLencode(address), apiKey]); client := THttpClient.Create; try stream := TMemoryStream.Create; try client.Get(url, stream); stream.Position := 0; reader := TStreamReader.Create(stream, TEncoding.UTF8); try response := reader.ReadToEnd; finally reader.Free; end; finally stream.Free; end; finally client.Free; end; // Parse the response to extract the latitude and longitude // … end; |
This function takes in an address
parameter, which is the physical address or place name for which you want to find the coordinates. It also takes in two variables lat
and lon
that will be used to store the latitude and longitude of the location. The function returns a Boolean value indicating whether it was able to successfully retrieve the coordinates.
To use this function, you would call it like this:
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var lat, lon: Double; success: Boolean; begin success := GetCoordinates(‘1600 Amphitheatre Parkway, Mountain View, CA’, lat, lon); if success then WriteLn(Format(‘Latitude: %f, Longitude: %f’, [lat, lon])); end; |
This would retrieve the coordinates for the address “1600 Amphitheatre Parkway, Mountain View, CA”, which is the location of Google’s headquarters. The function would return the latitude and longitude of the location in the lat
and lon
variables, and the output would be something like:
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Latitude: 37.422408, Longitude: –122.085609 |
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