Java字节数组到Ruby

Question

I have a Desktop application using java swing frames. I have to rewrite the application to either Ruby or python. However I understand java to certain extent - I need help rewriting certain piece of the code in java.

1.

byte[] ModuleGuid = new byte[]{
        (byte)0xe1, (byte)0x9a, (byte)0x69, (byte)0x01,
        (byte)0xb8, (byte)0xc2, (byte)0x49, (byte)0x80,
        (byte)0x87, (byte)0x7e, (byte)0x11, (byte)0xd4,
        (byte)0xd8, (byte)0xf1, (byte)0xbe, (byte)0x79
};

2.

JAVA_PvAPI_SensorInfoEx[] lptSensorInfo =
        new JAVA_PvAPI_SensorInfoEx[(int)PsConstant.JAVA_PvAPI_GET_SENSOR_INFO_MAX];

Answer 1

1. There's no such thing as byte in Ruby. When you want to store a sequence of bytes, you store it in a string:

    module_guid = "\\xE1\\x9A\\x69\\x01...".force_encoding('ASCII-8BIT')

   If you want to copy and paste from Java code, then use:

    module_guid = [0xe1, 0x9a, ...].pack('c*')

   By the way, I didn't declare the variable as ModuleGuid because capitalized identifiers are for constants in Ruby, and I didn't see the final keyword in your Java code.

2. Arrays in Ruby are just arrays. They can store any kind of objects. There's no int[] or String[] or Whatever[] in Ruby. Ruby arrays don't have fixed sizes and can be expanded or shrink any time. Your second piece of Java code can be rewritten as:

    sensor_info = []

   But, depending on your use-case, this statement itself may not be necessary because in Ruby you have sooooo many ways to obtain an array.