python 网络编程 （二）---tcp

import socket, sys, time  
  
host = sys.argv[1]  
textport = sys.argv[2]  
filename = sys.argv[3]  
  
#创建socket对象  
try:  
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
except socket.error, e:  
    print ‘Strange error creating socket:%s‘ % e  
sys.exit(1)  
  
#创建端口号  
try:  
    port = int(textport)  
except  ValueError:  
    try:  
        port = socket.getservbyname(textport, ‘tcp‘)  
    except socket.error, e:  
        print ‘Couldn not find your port:%s‘ % e  
        sys.exit(1)  
  
#连接socket  
try:  
    s.connect((host, port))  
except socket.gaierror, e:  
    print ‘Address-related error connecting to server :%s‘ % e  
    sys.exit(1)  
except socket.error, e:  
    print ‘Connection error:%s‘ % e  
    sys.exit(1)  
  
fd = s.makefile(‘rw‘, 0) #使用文件类对象  
print ‘sleeping...‘  
time.sleep(10) #线程休息10S  
print ‘Continuing...‘  
  
  
try:  
    s.sendall("GET %s HTTP/1.0\r\n\r\n" % filename)  
except socket.error, e:  
    print ‘Error sending data:%s‘ % e  
    sys.exit(1)  
  
try:  
    fd.flush()  
except socket.error, e:  
    print ‘Error sending data: %s‘ % e  
    sys.exit(1)  
  
try:  
    s.shutdown(1)  
    s.close()  
except socket.error, e:  
    print ‘Error sending data:%s‘ % e  
  
while True:  
    try:  
        buf = fd.read(2048)  
    except socket.error, e:  
        print ‘Error receiving data:%s‘ % e  
        sys.exit(1)  
    if not len(buf):  
        break  
    sys.stdout.write(buf)

try:  
    s.shutdown(1)  
    s.close()  
except socket.error, e:  
    print ‘Error sending data:%s‘ % e

try:  
    fd.flush()  
except socket.error, e:  
    print ‘Error sending data: %s‘ % e  
    sys.exit(1)