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Reflect value of []byte


Reflect value of []byte

By : Jody Bs
Date : November 22 2020, 01:01 AM
wish of those help You can use a type assertion for this; no need to use the reflect package:
code :
package main

func byteInterface() interface{} {
    return []byte("foo")
}

func main() {
    i := byteInterface()

    if b, ok := i.([]byte); ok {
      // use b as []byte
      println(len(b))
    } else {
      panic("should have bytes")
    }
}


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Check if java.lang.reflect.Field type is a byte array

Check if java.lang.reflect.Field type is a byte array


By : fluff79
Date : March 29 2020, 07:55 AM
Hope that helps array instanceof byte[] checks whether array is an object of type byte[]. But in your case array is not a byte[], it's an object of type Class that represents byte[].
You can access a Class that represents some type T as T.class, therefore you need the following check:
code :
if (array == byte[].class) { ... }
How can I bit-reflect a byte in Delphi?

How can I bit-reflect a byte in Delphi?


By : hop
Date : March 29 2020, 07:55 AM
it helps some times Is there an easy way to bit-reflect a byte variable in Delphi so that the most significant bit (MSB) gets the least significant bit (LSB) and vice versa? , In code you can do it like this:
code :
function ReverseBits(b: Byte): Byte;
var 
  i: Integer;
begin
  Result := 0;
  for i := 1 to 8 do
  begin
    Result := (Result shl 1) or (b and 1);
    b := b shr 1;
  end;
end;
function ReverseBits(b: Byte): Byte; inline;
const
  Table: array [Byte] of Byte = (
    0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240,
    8,136,72,200,40,168,104,232,24,152,88,216,56,184,120,248,
    4,132,68,196,36,164,100,228,20,148,84,212,52,180,116,244,
    12,140,76,204,44,172,108,236,28,156,92,220,60,188,124,252,
    2,130,66,194,34,162,98,226,18,146,82,210,50,178,114,242,
    10,138,74,202,42,170,106,234,26,154,90,218,58,186,122,250,
    6,134,70,198,38,166,102,230,22,150,86,214,54,182,118,246,
    14,142,78,206,46,174,110,238,30,158,94,222,62,190,126,254,
    1,129,65,193,33,161,97,225,17,145,81,209,49,177,113,241,
    9,137,73,201,41,169,105,233,25,153,89,217,57,185,121,249,
    5,133,69,197,37,165,101,229,21,149,85,213,53,181,117,245,
    13,141,77,205,45,173,109,237,29,157,93,221,61,189,125,253,
    3,131,67,195,35,163,99,227,19,147,83,211,51,179,115,243,
    11,139,75,203,43,171,107,235,27,155,91,219,59,187,123,251,
    7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247,
    15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255
  );
begin
  Result := Table[b];
end;
How can I reflect fixed width byte[] field information on a struct?

How can I reflect fixed width byte[] field information on a struct?


By : abrozas
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can check for the presence of the FixedBufferAttribute custom attribute on your field types (found in the CustomAttributes collection of the type.
In your case, you be able to check for the presence of an attribute that matches the following:
code :
[FixedBufferAttribute(typeof(Byte), 20)]
Convert byte to string using reflect.StringHeader still allocates new memory?

Convert byte to string using reflect.StringHeader still allocates new memory?


By : user3599943
Date : March 29 2020, 07:55 AM
it should still fix some issue First of all, type conversions are calling a internal functions, for this case it's slicebytetostring. https://golang.org/src/runtime/string.go?h=slicebytetostring#L75
It does copy of slice's content into new allocated memory.
code :
*(*string)(unsafe.Pointer(&byte_slice))
Why is there no "byte" kind in the reflect package?

Why is there no "byte" kind in the reflect package?


By : McCzaju
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Yes, byte is an alias for uint8: "all numeric types are distinct except byte, which is an alias for uint8, and rune, which is an alias for int32" (italics mine). You can even write code like var x []uint8 = []byte("hi!") and it compiles.
Since there's no difference except in how the source is written, the reflect package can't do much special with bytes when manipulating the (identical) structures in RAM at runtime.
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