缘由
看过上篇文章《OpenCvSharp基于颜色反差规避FBA面单贴标（2）》的都应该有印象这么一行代码：
// 面单颜色列表（十六进制格式）
privatestaticreadonly List<string> LabelColors = new List<string>
{
"#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"
};
每次有不同颜色或者无法定位的面单，都需要人工补录面单的背景色HEX，那么能不能集成一个工具，自动吸取图片色号保存后，这里能立即生效呢？答案是肯定的！先看看动态效果图：
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点击取色，跟随鼠标实时显示背景色便于定位
快捷键Alt+C,抓取当前鼠标所在背景色存储到列表并存储到根目录colorHistory.json文件，便于其他地方读取
列表支持右键删除错误颜色（如下图）
其他地方读取抓取的颜色列表
image
保存的json文件格式如下:
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[
"#018DBE",
"#B1C681",
"#03231E",
"#61CB81",
"#00424A",
"#B5BD68",
"#A3D9A3",
"#F68A1E",
"#0E83BA",
"#861B2D",
"#059BBC"
]
每次抓取都会往json存储当前最新色号，然后其他地方实时读取json即可:
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//// 面单颜色列表（十六进制格式）
//private static readonly List<string> LabelColors = new List<string>
//{
// "#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"
//};
static List<string> LabelColors = new List<string>();
privatestatic List<string> LoadColorList()
{
try
{
string historyFilePath = System.Windows.Forms.Application.StartupPath + @"\colorHistory.json";
if (File.Exists(historyFilePath))
{
string json = File.ReadAllText(historyFilePath);
var hexList = JsonSerializer.Deserialize<List<string>>(json);
foreach (var hex in hexList)
{
if (!string.IsNullOrEmpty(hex))
{
LabelColors.Add(hex);
}
}
return LabelColors;
}
}
catch (Exception ex)
{
MessageBox.Show($"加载历史记录失败: {ex.Message}", "错误",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
returnnull;
}
116076-20250310125032345-1793233350[1]
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private List<Color> colorHistory = new List<Color>();
private MagnifierForm magnifierForm;
privatestring historyFilePath = "colorHistory.json";
private ContextMenuStrip historyContextMenu;
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// 初始化右键菜单
privatevoidInitializeContextMenu()
{
historyContextMenu = new ContextMenuStrip();
ToolStripMenuItem deleteItem = new ToolStripMenuItem("删除选中颜色");
deleteItem.Click += DeleteItem_Click;
ToolStripMenuItem clearAllItem = new ToolStripMenuItem("清空所有历史");
clearAllItem.Click += ClearAllItem_Click;
ToolStripMenuItem copyItem = new ToolStripMenuItem("复制颜色值");
copyItem.Click += CopyItem_Click;
historyContextMenu.Items.AddRange(new ToolStripItem[] {
copyItem, deleteItem, clearAllItem
});
lstHistory.ContextMenuStrip = historyContextMenu;
LoadColorHistory();
// 设置ListBox为自绘模式
lstHistory.DrawMode = DrawMode.OwnerDrawFixed;
lstHistory.DrawItem += LstHistory_DrawItem;
}
ListBox实时显示当前吸取的背景色，重绘代码如下:
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// 绘制ListBox项
privatevoidLstHistory_DrawItem(object sender, DrawItemEventArgs e)
{
if (e.Index < 0 || e.Index >= colorHistory.Count) return;
e.DrawBackground();
Color color = colorHistory[e.Index];
string text = $"{ColorToHex(color)} - RGB({color.R},{color.G},{color.B})";
// 绘制颜色块
Rectangle colorRect = new Rectangle(e.Bounds.Left + 2, e.Bounds.Top + 2, 20, e.Bounds.Height - 4);
using (SolidBrush brush = new SolidBrush(color))
{
e.Graphics.FillRectangle(brush, colorRect);
}
e.Graphics.DrawRectangle(Pens.Black, colorRect);
// 绘制文本
Rectangle textRect = new Rectangle(e.Bounds.Left + 25, e.Bounds.Top, e.Bounds.Width - 25, e.Bounds.Height);
using (SolidBrush textBrush = new SolidBrush(e.ForeColor))
{
e.Graphics.DrawString(text, e.Font, textBrush, textRect);
}
e.DrawFocusRectangle();
}
RGB和HEX 相互转换
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// HEX字符串转Color
private Color HexToColor(string hex)
{
try
{
// 移除#号
hex = hex.Replace("#", "");
// 处理3位HEX
if (hex.Length == 3)
{
hex = $"{hex[0]}{hex[0]}{hex[1]}{hex[1]}{hex[2]}{hex[2]}";
}
// 处理6位HEX
if (hex.Length == 6)
{
byte r = Convert.ToByte(hex.Substring(0, 2), 16);
byte g = Convert.ToByte(hex.Substring(2, 2), 16);
byte b = Convert.ToByte(hex.Substring(4, 2), 16);
return Color.FromArgb(r, g, b);
}
return Color.Empty;
}
catch
{
return Color.Empty;
}
}
// 颜色转HEX
privatestringColorToHex(Color color)
{
return$"#{color.R:X2}{color.G:X2}{color.B:X2}";
}
结束语
感谢各位耐心查阅！ 如果您有更好的想法欢迎一起交流，有不懂的也可以微信公众号联系博主，作者公众号会经常发一些实用的小工具和demo源码，需要的可以去看看！另外，如果觉得本篇博文对您或者身边朋友有帮助的，麻烦点个
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