[英]Converting a number in javascript to a 4 byte array
I'm taking my shot at writing a node server in which I need to send a 32 bit integer to ac# client (as the header). 我正在写一个节点服务器,在其中我需要向ac#客户端(作为标头)发送32位整数。
I'm not quite sure how to do that, as the bit shift operators confuse me. 我不太确定该怎么做,因为移位运算符使我感到困惑。 I think my c# client expects these integers in little endian format (I'm not sure, I say that because the
NetworkStream
IsLittleEndian property is true). 我认为我的C#客户端希望这些整数采用小端序格式(我不确定,因为
NetworkStream
IsLittleEndian属性为true,所以我不能这么说)。
So say I have a variable in javascript that's something like 所以说我在javascript中有一个变量,就像
var packetToDeliverInBytes = GetByteArrayOfSomeData();
//get the integer we need to turn into 4 bytes
var sizeOfPacket = packetToDeliver.length;
//this is what I don't know how to do
var bytes = ConvertNumberTo4Bytes(sizeOfPacket)
//then somehow do an operation that combines these two byte arrays together
//(bytes and packetToDeliverInBytes in this example)
//so the resulting byte array would be (packetToLiver.length + 4) bytes in size
//then send the bytes away to the client
socket.write(myByteArray);
How do I write the ConvertNumberTo4Bytes() function? 如何编写ConvertNumberTo4Bytes()函数?
Bonus 奖金
How do I combine these 2 byte arrays into one so I can send them in one socket.write call 我如何将这两个字节数组组合为一个,以便可以在一个socket.write调用中发送它们
Using the Buffer
object in node seems to be the way to go thanks to elclanrs comment. 感谢elclanrs的评论,在节点中使用
Buffer
对象似乎是一种方法。
var buf = new Buffer(4 + sizeOfPacket);
buf.writeInt32LE(sizeOfPacket, 0);
buf.write(packetToDeliverInBytes, 4);
socket.write(buf);
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