TCP/IP双向聊天应用发送图片存在问题。

在TCP/IP双向聊天应用中，发送图片的问题在于图片需要以二进制方式传输，而普通的文本消息只需要以字符串方式传输。因此，在发送图片时需要进行特殊处理，将其转换为二进制数据后再发送。

示例代码：

1. 发送方代码：

import socket
import os

# 创建TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 设置服务器地址和端口号
server_address = ('localhost', 10000)

# 连接服务器
print('connecting to {} port {}'.format(*server_address))
sock.connect(server_address)

# 发送图片
filename = 'image.png'
if os.path.exists(filename):
    # 读取图片
    with open(filename, 'rb') as f:
        data = f.read()
    
    # 发送图片数据
    sock.sendall(data)
    print('Image sent successfully.')
else:
    print('File does not exist:', filename)

# 关闭连接
sock.close()

2. 接收方代码：

import socket
import os

# 创建TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 设置服务器地址和端口号
server_address = ('localhost', 10000)

# 绑定端口号
sock.bind(server_address)

# 监听连接
sock.listen(1)
print('waiting for a connection...')

# 等待连接
connection, client_address = sock.accept()
print('connected from:', client_address)

# 接收图片
data = connection.recv(1024)
filename = 'image_recv.png'
with open(filename, 'wb') as f:
    while data:
        f.write(data)
        data = connection.recv(1024)
    
print('Image received successfully:', filename)

# 关闭连接
connection.close()
sock.close()