Protocol buffers 从java客户端向C++服务器发送协议缓冲消息 我尝试从java客户端向C++服务器发送协议缓冲消息。在运行服务器和客户端之后,我只得到0作为Api字段的值,甚至在Java客户端将其设置为1
Java客户端代码如下所示:Protocol buffers 从java客户端向C++服务器发送协议缓冲消息 我尝试从java客户端向C++服务器发送协议缓冲消息。在运行服务器和客户端之后,我只得到0作为Api字段的值,甚至在Java客户端将其设置为1,protocol-buffers,Protocol Buffers,Java客户端代码如下所示: public static void main(String[] args) throws IOException { Socket echoSocket = null; PrintWriter out = null; BufferedReader in = null; //the protocol buffers message is called INFO and have only one field Api
public static void main(String[] args) throws IOException {
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
//the protocol buffers message is called INFO and have only one field Api
INFO info = INFO.newBuilder()
.setApi(1)
.build();
try {
echoSocket = new Socket("localhost", 30000);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: Localhost.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection to: Localhost.");
System.exit(1);
}
out.println((info.toByteArray())); // serialize and the message
System.out.println("send ");
}
}
和C++服务器代码看起来如下:
int main ( int argc, int argv[] ){
INFO info;
try
{
// Create the socket
ServerSocket server ( 30000 );
while ( true )
{
ServerSocket new_sock;
server.accept ( new_sock );
try
{
while(true){
std::string data;
// in the next i'll i receive Data from the Java client i already test it with a string, and it works
new_sock >> data;
info.ParseFromString(data);
cout << "api: " << info.api() << endl;
}
}
catch ( SocketException& ) {}
}
}
catch ( SocketException& e )
{
std::cout << "Exception was caught:" << e.description() << "\nExiting.\n";
}
return 0;
}
我不确定我做错了什么。我不知道我是否正确地序列化了解析。我没有得到任何错误,只有一个错误的Api值。如果您发现任何问题,请告诉我!非常感谢 我认为问题在于:
new_sock >> data;
验证为数据读入的字节数是否与info.toByteArray的大小相同。我的猜测是,它们是不同的,在这种情况下,您需要更改默认情况下从new_sock newline分隔的IO读取数据的方式?您应该添加调试消息,以检查是否确实接收到与发送相同的字节数。我不认为新的数据;正在使用换行符和“\0”字符正常工作。ProtoBuf消息不包含有关自身长度的信息。当您通过原始套接字发送它们时,您必须首先告诉对方以下消息的长度。您应该看看protobufs CodedInputStream和CodedOutStream。