Read environment variables

Windows with Delphi
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Read environment variables

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Windows provides two function to access the operating system's environment strings.
The procedure below reads the environment into a TStringList which you need to pass as a parameter.
An example for a call populating a TMemo field:

GetEnvStringsList(TStringList(Memo1.Lines));

The two relevant API calls are GetEnvironmentStrings and FreeEnvironmentStrings.

procedure GetEnvironmentStringsList(EnvironmentStrings: TStringList);
var
  PEnv,
  PCopyEnv: PChar;
begin { GetEnvironmentStringsList }
  EnvironmentStrings.Clear;
  PEnv := GetEnvironmentStrings;
  PCopyEnv := PEnv;
  if PCopyEnv<>nil then
    repeat
      EnvironmentStrings.Add(StrPas(PCopyEnv));
      Inc(PCopyEnv, StrLen(PCopyEnv) + 1);
    until PCopyEnv^=#0;
  FreeEnvironmentStrings(PEnv);
  PCopyEnv := nil
end; { GetEnvironmentStringsList }

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