使用DataInputStream /套接字從GPS設備讀取數據

Question

如何從GPS設備讀取數據？

我從GPS設備使用插座& DataInputStream數據的讀取，雖然我獲取數據我得到的東西ASCII編碼字符串，並在該字符串的結尾我有，我想用我的回答字符串。那麼，如何在沒有如此複雜的字符集的情況下連續獲取數據並獲取確切的字符串我也嘗試使用串口。

在這裏，我試過了。

//Using Serial Port // 

CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(portname); 
System.out.println("fired"); 
// Open port 
// Requires owner name and timeout 
CommPort port = portId.open("Java Printing", 3000); 

// Setup reading from file 
FileInputStream fis = new FileInputStream(filename); 
BufferedInputStream bis = new BufferedInputStream(fis); 

// Setup output 
OutputStream os = port.getOutputStream(); 
BufferedOutputStream bos = new BufferedOutputStream(os); 

int c; 
while ((c = bis.read()) != -1) 
{ 
bos.write(c); 
System.out.print((char)c); 
} 

// Close 
bos.close();`enter code here` 
bis.close(); 
port.close(); 

//Using Normal Socket // 

char[] inputChars = new char[1024]; 
byte[] data = new byte[1024]; 
int charsRead = 0; 
BufferedReader inputStream = null; 

System.out.println("1 1 1 1 1"); 
InputStreamReader isr = new InputStreamReader(s1.getInputStream()); 
System.out.println("2 2 2 2 2 2"); 
inputStream = new BufferedReader(isr); 

//Read 1024 characters. Note: This will pause the thread when stream is empty. 

System.out.println("Reading from stream:"); 
while ((charsRead = inputStream.read(inputChars)) != -1) 
{ 
System.out.println("Chars read from stream: " + charsRead); 
System.out.println("inputChars = "+inputChars); 
data = new String(inputChars).getBytes("US-ASCII"); 
System.out.flush(); 
} 
byte[] decodedBytes = Base64.encodeBase64(data); 
System.out.println("decodedBytes " + new String(decodedBytes)); 

Answer 1

可以與GPS芯片無論是在賦範NMEA格式，或與芯片manufaturer自定義的二進制協議通信。
確保您已正確設置波特率和（虛擬）COM端口。

默認protocol1始終是NMEA。 NMEA消息以「$」開頭。 你總是應該得到一個$ GPRMC消息