GetChar () non-blocking mode of Linux C

Reference Link: http://blog.csdn.net/zydlyq/article/details/50963360

#include".. /include/commuart.h"#include"ComCommon.h"#include<stdio.h>#include<unistd.h>#include<iostream>#include<stdlib.h>#include<string.h>#include<sys/time.h>#include<sys/types.h>#include<termios.h>using namespacestd;#defineUsr_debugStatic structTermios ori_attr, cur_attr;Static__inlineintTty_reset (void){   if(Tcsetattr (Stdin_fileno, Tcsanow, &ori_attr)! =0)      return-1; return 0;}Static__inlineintTty_set (void){   if(Tcgetattr (Stdin_fileno, &ori_attr)) return-1; memcpy (&cur_attr, &ori_attr,sizeof(cur_attr)); Cur_attr.c_lflag&= ~Icanon;//cur_attr.c_lflag |= ECHO;Cur_attr.c_lflag &= ~ECHO; Cur_attr.c_cc[vmin]=1; Cur_attr.c_cc[vtime]=0; if(Tcsetattr (Stdin_fileno, Tcsanow, &cur_attr)! =0)      return-1; return 0;}Static__inlineintKbhit (void) {Fd_set RfDs; structTimeval TV; intretval; /*Watch stdin (FD 0) to see if it has input.*/Fd_zero (&RFDS); Fd_set (0, &RFDS); /*Wait up to five seconds.*/tv.tv_sec=0; Tv.tv_usec=0; retval=Select(1, &rfds, NULL, NULL, &TV); /*Don ' t rely on the value of TV now!*/   if(RetVal = =-1) {perror ("Select ()"); return 0; } Else if(retval)return 1; /*fd_isset (0, &rfds) would be true.*/   Else      return 0; return 0;}intMainintargcChar*argv[]) {//non-blocking GetChar initialization   intTty_set_flag; Tty_set_flag=Tty_set (); Charcom_num[3] = {0}; if(ARGC <2) {printf ("Please enter COM num:\n"); scanf ("%c", &com_num); } Else {      //com_num = *argv[1];strcpy (Com_num, argv[1]); } #ifdef usr_debug printf ("Main entry\n");#endif //Usr_debugCcomcommon*m_pcomuart =NewCcommuart; #ifdef usr_debug printf ("Create ccommuart\n");#endif //Usr_debug   Charsendstr[ the] = {0}; strcpy (Sendstr,"/dev/ttys100");   strcat (Sendstr, com_num); strcat (Sendstr,", 115200,8,1,n"); //M_pcomuart->initcomcomm ("/dev/ttys1001,115200,8,1,n");M_pcomuart->Initcomcomm (SENDSTR); //strcat (sendstr, "kkkkkkkkkkkkkkkkkk");//Write FileFILE*PFile; Charfilename[124] = {0}; sprintf (FileName,"Readdata_dir/%s.txt", Com_num); PFile= fopen (FileName,"W"); Charrbuff[ the] = {0}; intNsize =0; inti =0; intncnt =0;  while(1) {      /********************* sending test *******************************/      //M_pcomuart->sendbuff (buff,sizeof (buff)); //m_pcomuart->sendstr ("1234567887654321abcdefgh"); //m_pcomuart->sendstr ("Kkkkkkkkkkkkkkkkkk");      if(Kbhit ()) {Const intKey =GetChar (); //printf ("%c pressed\n", key);         if(Key = ='Q')             Break; } /*else {fprintf (stderr, "<no key detected>\n"); }*/      /********************* received test case *************************/memset (Rbuff,0, the); Nsize= M_pcomuart->getdata (Rbuff, the, +); if(Nsize >0) {printf ("nsize:%d\n", nsize);//if (ncnt==10) {          for(i =0; i < nsize; i++)         {            //printf ("%02x", (unsigned char) rbuff[i]);fprintf (PFile,"%02x", (unsignedChar) rbuff[i]); if(ncnt = =7) {fprintf (PFile,"\ n"); Ncnt=0; } Else{ncnt++; }         }         //Binary Input//fwrite (Rbuff, sizeof (char), sizeof (Rbuff), pFile);//ncnt = 0;//}else{//ncnt++;// }printf"\ n"); //printf ("%s\n", Rbuff);      }      //printf ("Rec Buff data:%s\n", rbuff); //printf ("Get char:%d\n", M_pcomuart->getchar (10)); //sleep (1); //Usleep (+);} Delete M_pcomuart; Fclose (pFile);//operation of the thread   if(Tty_set_flag = =0) Tty_reset ();}

GetChar () non-blocking mode of Linux C