Flutter (dart) int 跟 byte[]之间的互
2020-09-07 本文已影响0人
plmman
byte[]转int
class Bytes2int{
static convert(List list){
var length = list.length;
switch(length){
case 1:
return list[0];
case 2:
return toInt16(list);
case 4:
return toInt32(list);
default:
print('传入数据不对');
break;
}
}
//byte[] to int
static int toInt16( List list, {int index=0})
{
Uint8List byteArray =Uint8List.fromList(list);
ByteBuffer buffer = byteArray.buffer;
ByteData data =new ByteData.view(buffer);
int short = data.getInt16(index, Endian.big);
return short;
}
static int toInt32( List list, {int index=0})
{
Uint8List byteArray =Uint8List.fromList(list);
ByteBuffer buffer = byteArray.buffer;
ByteData data =new ByteData.view(buffer);
int short = data.getInt32(index, Endian.big);
return short;
}
static int toInt64( List list, {int index=0})
{
Uint8List byteArray =Uint8List.fromList(list);
ByteBuffer buffer = byteArray.buffer;
ByteData data =new ByteData.view(buffer);
int short = data.getInt64(index, Endian.big);
return short;
}
}
int 转 byte[]
class int2Bytes{
static convert(int source,{Type type=Type.WORD}){
var s = source.toRadixString(16);
var pre ='0';
if(s.length%2==1) {
s = pre+s;
}
List list = [];
var uint8list = Hex.createUint8ListFromHexString(s);
switch(type){
case Type.BYTE:
break;
case Type.WORD:
if(uint8list.length==1){
list.add(0);
}
break;
case Type.DWORD:
for(var i =0;i<4-uint8list.length;i++) {
list.add(0);
}
break;
}
list.addAll(uint8list);
return list;
}
}
enum Type{
BYTE,//1
WORD,//2
DWORD,//4
STRING
}
