AS3 ByteArray 短读
我必须读取以不同方式（writeBite、writeShort 和 writeMultiByte）写入的字节序列，并在视频上显示它们的十六进制字节列表。 我的问题是转换数字 1500，我尝试了其他数字，结果是正确的...... 这是一个例子：
var bytes:Array = [];
var ba:ByteArray = new ByteArray();
ba.writeShort(1500);
ba.position = 0;
for (var i=0; i<ba.length; i++)
{
bytes.push(ba.readByte().toString(16));
}
trace(bytes);//5,-24 i'm expetting 5,DC
i have to read a sequence of bytes,that was written in different ways (writeBite, writeShort and writeMultiByte) and display them has list of HEX byte on video.
My problem is convert the number 1500, i tryed other number and the results was correct...
here is a an example:
var bytes:Array = [];
var ba:ByteArray = new ByteArray();
ba.writeShort(1500);
ba.position = 0;
for (var i=0; i<ba.length; i++)
{
bytes.push(ba.readByte().toString(16));
}
trace(bytes);//5,-24 i'm expetting 5,DC
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readByte 方法读取有符号字节（范围从 -128 到 127）。最高有效位定义符号。如果数字大于
127（如DC），该位将为1并且该数字将被视为负数。负字节的二进制补码用于获取有符号值。对于DC（二进制为1101 1100），补码将为0010 0011，即23。添加 1 后，该值将被视为负数，这将为您提供您所看到的-24。您应该使用 readUnsignedByte 读取 0 到 255 之间的值。
The method
readBytereads a signed byte (ranges from -128 to 127). The most significant bit defines the sign. In case of numbers greater than127(likeDC) that bit will be1and the number will be seen as a negative number. The two's complement of the negative byte is used to get the signed value. In case ofDC, which is1101 1100in binary the complement would be0010 0011which is23. A one is added and the value will be regarded as negative, which will give you the-24you are seeing.You should use readUnsignedByte to read values from 0 to 255.
由于 AS3 中没有真正的 Byte 类型，因此
readByte()返回 int。你可以尝试这个：As there is no real Byte type in AS3,
readByte()returns an int. You can try this instead: