How to detect the full path and file name of where the DLL was called from.

uses Windows;
procedure ShowDllPath stdcall;
var
  TheFileName : array[0..MAX_PATH] of char;
begin
 FillChar(TheFileName, sizeof(TheFileName), #0);
 GetModuleFileName(hInstance, TheFileName, sizeof(TheFileName));
 MessageBox(0, TheFileName, 'The DLL file name is:', mb_ok);
end;
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