این کد دقیقا همون که میخواستم نیست ولی کافیه:
function ProcessCount(const ExeName: String): Integer;
var
ContinueLoop: BOOL;
FSnapshotHandle: THandle;
FProcessEntry32: TProcessEntry32;
begin
FSnapshotHandle:= CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
FProcessEntry32.dwSize:= SizeOf(FProcessEntry32);
ContinueLoop:= Process32First(FSnapshotHandle, FProcessEntry32);
Result:= 0;
while Integer(ContinueLoop) <> 0 do begin
if ((UpperCase(ExtractFileName(FProcessEntry32.szExeF ile)) =
UpperCase(ExeName)) or (UpperCase(FProcessEntry32.szExeFile) =
UpperCase(ExeName))) then Inc(Result);
ContinueLoop:= Process32Next(FSnapshotHandle, FProcessEntry32);
end;
CloseHandle(FSnapshotHandle);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
If ProcessCount(ExtractFileName(Application.ExeName)) >1 then
Application.terminate;