Question

如果我输入0xffffffff，那么输出必须是：答：255 R：255 G：255 B：255

我找不到任何转换此教程的教程。谢谢！

Answer 1

您可以使用Color结构（来自.NET System.Drawing程序集）来解析它：

using System;
using System.Drawing;

void Main()
{
    var c = Color.FromArgb(unchecked((int)0xaa336539));
    Console.WriteLine("Alpha: {0}", c.A);
    Console.WriteLine("Red: {0}", c.R);
    Console.WriteLine("Green: {0}", c.G);
    Console.WriteLine("Blue: {0}", c.B);
}

产生以下输出：

Alpha: 170
Red: 51
Green: 101
Blue: 57

Answer 2

转移和掩蔽。

（虽然有些人更喜欢使用/ 256进行转换，而使用% 256进行转换

unsigned long x = 0xaa336539;

// Note the LSB to MSB order

//mask
unsigned char b = x & 0xff;

//shift
x >>= 8;

//mask
unsigned char g = x & 0xff;

//shift
x >>= 8;

//mask
unsigned char r = x & 0xff;

//shift
x >>= 8;

//mask
unsigned char a = x & 0xff;

// Technically, just saving it into an 8 bit wide container is the same as the masking, although some compilers might warn you

Answer 3

// Original input
var input = "0xaa336539";

// Gets aa336539
var inputRemovePrefix = input.Substring(2);

// Converts to a long
var numberConversion = long.Parse(inputRemovePrefix, System.Globalization.NumberStyles.HexNumber);

// Converts to 6 character hex string so the next operation will always work
var convertedInput = numberConversion.ToString("X6");

var aVal = int.Parse(convertedInput.Substring(0,2), System.Globalization.NumberStyles.HexNumber);
var rVal = int.Parse(convertedInput.Substring(2,2), System.Globalization.NumberStyles.HexNumber);
var gVal = int.Parse(convertedInput.Substring(4,2), System.Globalization.NumberStyles.HexNumber);
var bVal = int.Parse(convertedInput.Substring(6,2), System.Globalization.NumberStyles.HexNumber);

// Prints result
Console.WriteLine($"A: {aVal} R: {rVal} G: {gVal} B: {bVal}");

将此类型颜色值转换为ARGB

3 个答案: