Javascript ascii 字符串到十六进制字节数组
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Javascript ascii string to hex byte array
提问by crankshaft
I am trying to convert an ASCII string into a byte array.
我正在尝试将 ASCII 字符串转换为字节数组。
Problem is my code is converting from ASCII to a string array and not a Byte array:
问题是我的代码正在从 ASCII 转换为字符串数组而不是字节数组：
var tx = '[86400:?]';
for (a = 0; a < tx.length; a = a + 1) {
hex.push('0x'+tx.charCodeAt(a).toString(16));
}
This results in:
这导致：
[ '0x5b','0x38','0x36','0x30','0x30','0x30','0x3a','0x3f','0x5d' ]
But what I am looking for is:
但我正在寻找的是：
[0x5b,0x38 ,0x30 ,0x30 ,0x30 ,0x30 ,0x3a ,0x3f,0x5d]
How can I convert to a byte rather than a byte string ?
如何转换为字节而不是字节字符串？
This array is being streamed to a USB device:
此数组正在流式传输到 USB 设备：
device.write([0x5b,0x38 ,0x30 ,0x30 ,0x30 ,0x30 ,0x3a ,0x3f,0x5d])
And it has to be sent as one array and not looping sending device.write() for each value in the array.
它必须作为一个数组发送，而不是为数组中的每个值循环发送 device.write()。
回答by HBP
A single liner :
单班轮：
'[86400:?]'.split ('').map (function (c) { return c.charCodeAt (0); })
returns
回报
[91, 56, 54, 52, 48, 48, 58, 63, 93]
This is, of course, is an array of numbers, not strictly a "byte array". Did you really mean a "byte array"?
这当然是一个数字数组，而不是严格意义上的“字节数组”。你的意思是“字节数组”吗？
Split the string into individual characters then map each character to its numeric code.
将字符串拆分为单个字符，然后将每个字符映射到其数字代码。
Per your added information about device.writeI found this :
根据您添加的有关device.write我发现的信息：
Writing to a device
Writing to a device is performed using the write call in a device handle. All writing is synchronous.
device.write([0x00, 0x01, 0x01, 0x05, 0xff, 0xff]);
写入设备
写入设备是使用设备句柄中的 write 调用来执行的。所有写入都是同步的。
device.write([0x00, 0x01, 0x01, 0x05, 0xff, 0xff]);
on https://npmjs.org/package/node-hid
在https://npmjs.org/package/node-hid
Assuming this is what you are using then my array above would work perfectly well :
假设这是您正在使用的，那么我上面的数组将工作得很好：
device.write('[86400:?]'.split ('').map (function (c) { return c.charCodeAt (0); }));
As has been noted the 0xnotation is just that, a notation. Whether you specify 0x0aor 10or 012(in octal) the value is the same.
正如已经指出的那样，0x符号就是一个符号。无论您指定0x0aor10或012（八进制）值都是相同的。
