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

 

commentsThis article has not been rated yet. After reading, feel free to leave comments and rate it.

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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