Title: How to retrieve Environmental Variables as strings by name
function GetEnvVarValue(const VarName: string): string;
var
BufSize: Integer; // buffer size required for value
begin
// Get required buffer size (inc. terminal #0)
BufSize := GetEnvironmentVariable(PChar(VarName), nil, 0);
if BufSize 0 then
begin
// Read env var value into result string
SetLength(Result, BufSize - 1);
GetEnvironmentVariable(PChar(VarName),
PChar(Result), BufSize);
end
else
// No such environment variable
Result := '';
end;
procedure TForm1.Button1(Sender: TObject);
begin
ShowMessage(GetEnvVarValue('SystemRoot'));
end;
Usage Examples:
Here is the list of different variables you could use:
ALLUSERSPROFILE
APPDATA
CLIENTNAME
CommonProgramFiles
COMPUTERNAME
ComSpec
HOMEDRIVE
HOMEPATH
LOGONSERVER
NUMBER_OF_PROCESSORS
OS
Path
PATHEXT
PCToolsDir
PROCESSOR_ARCHITECTURE
PROCESSOR_IDENTIFIER
PROCESSOR_LEVEL
PROCESSOR_REVISION
ProgramFiles
SESSIONNAME
SystemDrive
SystemRoot
TEMP
TMP
USERDOMAIN
USERNAME
USERPROFILE
windir