获得程序当前目录

 char* get_exe_path()
 {
     static char buff[256];
     char *p;

 #if defined(WIN32)
     ::GetModuleFileName(NULL, buff, sizeof(buff));
     p = strrchr(buff, '\\');
 #else
   int pid;

   pid = getpid();
   sprintf(buff, "/proc/%d/exe", pid);
   readlink(buff, buff, sizeof(buff));
   p = strrchr(buff, '/');
 #endif
   *p = 0;
   return buff;
 }