将包含ASCII二进制十六进制的字符串转换为Buffer

Question

I am using node.js.

I have this string msg_str with the following contents "0102ab00aabb00" . I want to convert this string content (ASCII representing binary hex) and store it into a Buffer such that the contents of the Buffer looks like <01 02 ab 00 aa bb 00 > .

Some preliminary code I wrote which does not work as expected;

msg_str = "0102ab00aabb00";
buffer_binary = new Buffer(msg_str);
console.log(msg_str);   
console.log(buffer_binary); 

The console output of buffer_binary is 30 31 30 32 61 62 30 30 61 61 62 62 30 30 . The correct output should be 01 02 ab 00 aa bb 00 .

Answer 1

You need to tell the Buffer constructor that your string is in hex. Fortunately, this is pretty easy :)

msg_str = "0102ab00aabb00";
buffer_binary = new Buffer(msg_str, "hex"); // specify hex
console.log(msg_str); // logs 0102ab00aabb00
console.log(buffer_binary); // logs <Buffer 01 02 ab 00 aa bb 00>