十分感谢回复！！ 还有一个问题，那源程序是否需要改动。以下为源代码： # include <stdio.h> # include <string.h> # include <unistd.h> # include <fcntl.h> # include <errno.h> # include <termios.h> # include <sys/types.h > # include <sys/stat.h> # include <stdlib.h> // # define BAUDRATE b300 // # define BAUDRATE b9600 // # define BAUDRATE b57600 # define MODEMDEVICE "/dev/ttyS0" # define _POSIX_SOURCE 1 # define FALSE 0 #define TRUE 1 volatile int STOP=FALSE; int cnvbaudrate(char* pszbaudrate) { switch (atoi(pszbaudrate)) { case 50: return B50; case 75: return B75; case 110: return B110; case 134: return B134; case 150: return B150; case 200: return B200; case 300: return B300; case 600: return B600; case 1200: return B1200; case 1800: return B1800; case 2400: return B2400; case 4800: return B4800; case 9600: return B9600; case 19200: return B19200; case 38400: return B38400; case 57600: return B57600; default: return B57600; } } int main (int argc,char** argv) { int fd,c,res,nsize=1024,allsize=0,BAUDRATE; struct termios oldtio,newtio; char szsendbuf [1024]; int filelength; FILE * pfile; struct stat st; fd = open (MODEMDEVICE,O_RDWR|O_NOCTTY); if (fd<0) { perror (MODEMDEVICE); printf ("Error in open COM1/n"); exit (-1); } tcgetattr(fd,&oldtio); bzero(&newtio,sizeof(newtio)); /*串口新属性设置*/ //newtio.c_cflag = BAUDRATE |/* CRTSCTS | */ CS8;// | CLOCAL | CREAD; BAUDRATE=B57600; //printf("argc= %d,argv[1]=%s\n",argc,grgv[1]); if(argc >=2) BAUDRATE = cnvbaudrate(argv[1]); cfsetispeed(&newtio,BAUDRATE); cfsetospeed(&newtio,BAUDRATE); newtio.c_cflag|=CRTSCTS | CS8 | CLOCAL | CREAD; newtio.c_iflag = IGNPAR | ICRNL; //newtio.c_lflag = ICANON;//|ECHO; newtio.c_cc[VINTR] = 0; /*Ctrl-c*/ newtio.c_cc[VQUIT] = 0; /*Ctrl-\*/ newtio.c_cc[VERASE] = 0; /*del*/ newtio.c_cc[VKILL] = 0; /*@*/ newtio.c_cc[VEOF] = 4; /*Ctrl-d*/ newtio.c_cc[VTIME] = 0; newtio.c_cc[VMIN] = 1; newtio.c_cc[VSWTC] = 0; /*`\0`*/ newtio.c_cc[VSTART] = 0; /*Ctrl-q*/ newtio.c_cc[VSTOP] = 0; /*Ctrl-s*/ newtio.c_cc[VSUSP] = 0; /*ctrl-z*/ newtio.c_cc[VEOL] = 0; /*`\0*/ newtio.c_cc[VREPRINT] = 0; /*ctrl-r*/ newtio.c_cc[VDISCARD] = 0; /*ctrl-u*/ newtio.c_cc[VWERASE] = 0; /*ctrl-w*/ newtio.c_cc[VLNEXT] = 0; /*ctrl-v*/ newtio.c_cc[VEOL2] = 0; /*`\0`*/ tcflush (fd,TCIFLUSH); tcsetattr (fd,TCSANOW,&newtio); stat ("test.bmp",&st); if ((pfile = fopen ("test.bmp","r"))==NULL) { printf ("Can`t find the file test.bmp!"); return 0; } filelength=st.st_size; printf("file size :%d\n",filelength); //write (fd,(char *)&filelength,sizeof(int)); while (nsize==1024) { bzero(szsendbuf,1024); nsize=fread(szsendbuf,1,1024,pfile); nsize=write(fd,szsendbuf,nsize); allsize+=nsize; if(! (allsize&0x3fff)) printf("all_size:%dthis_time:%dtimes:%d\n",allsize,nsize,allsize/1024); } fclose (pfile); tcsetattr (fd,TCSANOW,&oldtio); close(fd); }