Using TRegistry

If you are writing a Windows-only application and are comfortable with the structure of the system Registry, you can use TRegistry. Unlike TRegistryIniFile, which uses the same properties and methods of other ini file components, the properties and methods of TRegistry correspond more directly to the structure of the system Registry. You can specify both the root key and subkey using TRegistry, while TRegistryIniFile uses HKEY_CURRENT_USER as the root key.

In addition to methods for opening, closing, saving, moving, copying, and deleting keys, TRegistry lets you specify the access level you want to use.

Note: TRegistry is not available for cross-platform programming.

The following example retrieves a value from a registry entry:

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function GetRegistryValue(KeyName: string): string;
var
  Registry: TRegistry;
begin
Registry := TRegistry.Create(KEY_READ);
  try
    Registry.RootKey = HKEY_LOCAL_MACHINE;
// False because we do not want to create it if it doesn't exist
    Registry.OpenKey(KeyName, False);
    Result := Registry.ReadString('VALUE1');
  finally
    Registry.Free;
  end;
end;

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#include <Registry.hpp>
AnsiString GetRegistryValue(AnsiString KeyName)
{
AnsiString S;
TRegistry *Registry = new TRegistry(KEY_READ);
try
{
Registry->RootKey = HKEY_LOCAL_MACHINE;
// False because we do not want to create it if it doesn't exist
Registry->OpenKey(KeyName,false);
S = Registry->ReadString("VALUE1");
}
__finally
{
delete Registry;
}
return S;
}