Allow only one instance of a program (works also under NT)

Windows with Delphi
Windows API (94)
Windows Filesystem (41)
Windows Forms (69)
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Allow only one instance of a program (works also under NT)

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Just add this unit to your uses clause

uses Single;

and your program will not be started twice:

unit Single;

interface

implementation
  uses Windows, SysUtils;

var hnd: THandle;

initialization
  hnd := CreateMutex(nil, True, 'irgendwaseinmaliges');
  if GetLastError = ERROR_ALREADY_EXISTS then Halt;

finalization
  if hnd <> 0 then CloseHandle(hnd);
end.

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