1 using system;
2 using system. runtime. interopservices;
3
4 class mutex
5 {
6 [dllimport ("coredll. dll")]
7 Private Static extern int getlasterror ();
8
9 [dllimport ("coredll. dll")]
10 Private Static extern int releasemutex (intptr hmutex );
11
12 [dllimport ("coredll. dll")]
13 Private Static extern intptr createmutex (
14 security_attributes lpmutexattributes,
15 bool binitialowner, string lpname );
16
17 [structlayout (layoutkind. Sequential)]
18 public class security_attributes
19 {
20 public int nlength;
21 public int lpsecuritydescriptor;
22 public int binherithandle;
23}
24
25 private const int error_already_exists = 0183;
26
27 public static void run ()
28 {
29 intptr hmutex = createmutex (null, false, "zjs_fj ");
30 if (getlasterror ()! = Error_already_exists)
31 {
32 system. Windows. Forms. application. Run (New form1 ());
33 return;
34}
35 else
36 {
37 releasemutex (hmutex );
38 return;
39}
40}
41} // class
42
