本机消息传递主机尝试发送977472013字节长的消息 [英] Native Messaging host tried sending a message that is 977472013 bytes long

问题描述

我启用了Chrome的日志记录功能，因此我可以读取 C：\ Users \％UserName％\AppData\Local\Google\Chrome\User Data\chrome_debug.log file

我实际上无法使用我的Java应用程序发送或接收消息，但我知道它已被使用。

以下是我的主机清单：

  {
allowed_origins：
 [
chrome-extension：// EXTENSION- ID /
，
description：my.app，
name：my.app，
path：launch.bat ，
type：stdio
} 
  

这里是批处理文件launch.bat：

  java -jar％〜dp0ChromeSEOConnector.jar
  
 
 
  private String readMessage（InputStream in）抛出IOException {
字节[] b =新字节[4]; 
 in.read（b）; 
 
 int size = getInt（b）; 
 
 b =新字节[size]; 
 in.read（b）; 
 
返回新的字符串（b，UTF-8）; 
} 
 
 private void sendMessage（String message）throws IOException {
 Text text = new Text（message）; 
 String resposta = serializer.toJson（text）; 
 System.out.write（getBytes（resposta.length（）））; 
 System.out.write（resposta.getBytes（UTF-8））; 
 System.out.flush（）; 
} 
 
 public int getInt（byte [] bytes）{
 return（bytes [3]<< 24）& 0xff000000 | 
（字节[2] <= 16）& 0x00ff0000 | 
（字节[1]<< 8& 0x0000ff00 | 
（字节[0] <= 0）& 0x000000ff; 
} 
 
 public byte [] getBytes（int length）{
 byte [] bytes = new byte [4]; 
 bytes [0] =（byte）（length& 0xFF）; 
字节[1] =（字节）（（长度>> 8）& 0xFF）; 
字节[2] =（字节）（（长度> 16）&0xFF）; 
字节[3] =（字节）（（长度> 24）&0xFF）; 
返回字节; 
} 
  
似乎System.in从来没有得到我的应用程序的输入，而且System.out也永远不会发送数据。
 
 
 
 Chrome继续发生同样的错误： 
 
 
 本地消息传递主机尝试发送977472013字节长的消息。 
  
奇怪的是，消息的大小始终是相同的，即使我手动更改发送消息的大小，就好像该消息根本没有被分析。你有没有遇到那种错误？在此先感谢
解决方案
我认为您必须交换定义消息长度的字节顺序。将您的 getBytes（）方法更改为： 
 
 
  public byte [] getBytes（int length）{ 
 byte [] bytes = new byte [4]; 
字节[3] =（字节）（长度& 0xFF）; 
字节[2] =（字节）（（长度>> 8）&0xFF）; 
字节[1] =（字节）（（长度> 16）&0xFF）; 
 bytes [0] =（byte）（（length>> 24）&0xFF）; 
返回字节; 
} 
  
 
I'm using a java jar to send and receive messages using Chrome Native Messaging.


I enabled logging of Chrome so I could read C:\Users\%UserName%\AppData\Local\Google\Chrome\User Data\chrome_debug.log file

I'm actually unable to send or receive message with my Java app, but I know it is used.

Here is the manifest of my host :
{
   "allowed_origins" : 
    [ 
        "chrome-extension://EXTENSION-ID/" 
    ],
   "description" : "my.app",
   "name" : "my.app",
   "path" : "launch.bat",
   "type" : "stdio"
}
Here is content of the Batch file launch.bat :
java -jar "%~dp0ChromeSEOConnector.jar"
And here is my Java code :
private String readMessage(InputStream in) throws IOException {
        byte[] b = new byte[4];
        in.read(b);

        int size = getInt(b);

        b = new byte[size];
        in.read(b);

        return new String(b, "UTF-8");
    }

private void sendMessage(String message) throws IOException {
        Text text = new Text(message);
        String resposta = serializer.toJson(text);
        System.out.write(getBytes(resposta.length()));
        System.out.write(resposta.getBytes("UTF-8"));
        System.out.flush();
    }

public int getInt(byte[] bytes) {
        return (bytes[3] << 24) & 0xff000000 |
                (bytes[2] << 16) & 0x00ff0000 |
                (bytes[1] << 8) & 0x0000ff00 |
                (bytes[0] << 0) & 0x000000ff;
    }

 public byte[] getBytes(int length) {
        byte[] bytes = new byte[4];
        bytes[0] = (byte) (length & 0xFF);
        bytes[1] = (byte) ((length >> 8) & 0xFF);
        bytes[2] = (byte) ((length >> 16) & 0xFF);
        bytes[3] = (byte) ((length >> 24) & 0xFF);
        return bytes;
    }
It seems like the System.in does never get the input of my app, and the System.out never sends data also.

Chrome keeps on getting the same error :
Native Messaging host tried sending a message that is 977472013 bytes long.
What is weird is that the size of the message is always the same, even if I change manually the size of the message sent, as if the message was not analyzed at all. Did you encounter that kind of error ? Thanks in advance
解决方案
I think you have to swap the order of the bytes defining your message length. Change your getBytes() method to this:
public byte[] getBytes(int length) {
    byte[] bytes = new byte[4];
    bytes[3] = (byte) (length & 0xFF);
    bytes[2] = (byte) ((length >> 8) & 0xFF);
    bytes[1] = (byte) ((length >> 16) & 0xFF);
    bytes[0] = (byte) ((length >> 24) & 0xFF);
    return bytes;
}


                        
这篇关于本机消息传递主机尝试发送977472013字节长的消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！