Title: How to determine the System Root
Question: Many programs write "%SystemRoot%" in a registry value to give the location where Windows is installed. This article gives a function that can be used to determine the expanded path for SystemRoot.
Answer:
// Modified from bbwininf.zip at the Delphi Super Page.
// The original function source code only checked the "Windows" key but not
// the "Windows NT" key.
// I have not tested this on Windows XP.
function GetSystemRoot: string;
begin
with TRegistry.Create do
try
RootKey := HKEY_LOCAL_MACHINE;
OpenKey('SOFTWARE\Microsoft\Windows\CurrentVersion', False);
result := ReadString('SystemRoot');
if result = '' then
begin
CloseKey;
OpenKey('SOFTWARE\Microsoft\Windows NT\CurrentVersion', False);
result := ReadString('SystemRoot');
end;
finally
Free
end
end;