问编译代码中未解释的“无此类文件或目录”

EN

    #include <stdlib.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <errno.h>
    #include <linux/input.h>
    #include <string.h>
    #include <stdio.h>
    #include <iostream>
    #include <fstream>
    #include <signal.h>
    #include <float.h>
    #include <sa_api.h>
    #pragma comment(lib,"sa_api.lib")
    #undef max
    #undef min

   namespace kbrd{   
     const char *dev = "/dev/input/event3";
     struct input_event ev;
     ssize_t n;
     int fd;}

   using std::cin;
   using std::cout;
   using std::__cxx11::string;
   using std::endl;
   using std::ofstream;
   using std::ios;

   int main(void)
   {
    [[Code which 
      Initiates equipment API, prompts screen & reads keyboard to 
      gather details to be stored with data from attached test 
      equipment...]]`

    while (N_az <Num_Samples) {

      kbrd::fd = open(kbrd::dev, O_RDONLY);
      if (kbrd::fd == -1) {
        fprintf(stderr, "Cannot open %s: %s.\n", kbrd::dev, 
        strerror(errno));
        return EXIT_FAILURE;
      }
      //and then read keyboard events from the device:
      cout << "Check Point Alpha" << endl;
      while (1) {
        kbrd::n = read(kbrd::fd, &kbrd::ev, sizeof kbrd::ev);
        if (kbrd::n == (ssize_t)-1) {
          if (errno == EINTR)
            continue;
          else
            break;
        } else
        if (kbrd::n != sizeof kbrd::ev) {
          errno = EIO;
          break;
        }
        cout << "Check Point Beta" << endl;

        if (kbrd::ev.type == EV_KEY && kbrd::ev.value == 0 /*&& 
            kbrd::ev.value <= 2 */&& kbrd::ev.code == 57){
          cout << "Check Point Charlie" << endl;            

          continue;

          [[ Code to read attached test gear & store data, one point at a 
             time...]]

          N_az = N_az + 1;
        }
        else {
          fflush(stdout);
          fprintf(stderr, "%s.\n", strerror(errno));
          return EXIT_FAILURE;
        }
      }
    } 

   return EXIT_SUCCESS;
 }