Motion JPEG（M-JPEG或MJPEG，Motion Joint Photographic Experts Group，FourCC:MJPG）是一種影像壓縮格式，其中每一影格圖像都分別使用JPEG編碼。或許是實作上相對單純好理解，據說MJPEG常用在網路攝影機（IP-Camera）等相關的應用，由於也是相對古老的實作方式，大多的瀏覽器都支援.mjpg格式；在網路上最常被提到的知名套件是MJPG-Streamer ，在輕鬆的設定播放相關參數後可以輕易的將你的攝影機影像投到網頁上．
MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel, distributed algorithm on a cluster.
「流」是一連串從I/O設備讀寫的字符（Byte）。
<themotherfuckerextremelongpropertyname> 1 </themotherfuckerextremelongpropertyname>
需要使用者互動的軟體必須儘快回應使用者的活動，以便提供豐富的使用者經驗。不過，同時它也必須執行需要的計算以儘快提供使用者資料。在個人目前的工作領域，使用者體驗並非放在第一(甚至是最後一名)，大部分時間都花在Coding工作處理常式（Routines），主要實現概念為狀態機(State-Machine)與多工處理(Multi-Task)，在Main Thread執行
class Program
{
static void Main(string[] args)
{
int state = 0;
Action __delegate = null;
Task __task = null;
IAsyncResult handle = null;
ConcurrentQueue exchange = new ConcurrentQueue();
int outValue = 0;
//the main state machine
Program.method();
while (state != 500)
{
switch (state)
{
case 0:
// use Task
__task = new Task(new Action(Program.method));
__task.Start();
state +=10;
break;
case 10:
// wait until task done
if (__task.IsCompleted)
state +=10;
break;
case 20:
// use thread pool
ThreadPool.QueueUserWorkItem((object foo)=>{
Program.method();
exchange.Enqueue(0); // enqueue some meaningfll result
},null);
state+=10;
break;
case 30:
//wait until method had been scheduled and executed
if (exchange.TryDequeue(out outValue))
state +=10;
break;
case 40:
// use delegate/IAsyncResult
__delegate = new Action(method);
handle = __delegate.BeginInvoke((IAsyncResult ar)=>
{
method();
__delegate.EndInvoke(ar); // you had to call this to release ar
},null);
break;
case 50:
// wait until method had been executed
if (handle.IsCompleted)
state = 500;
break;
default:
break;
}
Thread.Sleep(0);// yield to other thread to run
}//while
}
static void method()
{
//reflect the current thread
Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId.ToString());
}
}
String __input = "Model:M1 Coordinates: X1.62 Y1.01 X9.53 Y2.3 X4.94 Y2.1 X8.55 Y3.15 X2.56 Y1.25 X5.57 Y2.72"; String __patternUnnamed = "Model:[\\\\w]+[\\\\s]+Coordinates:[\\\\s]+(X([-+]?[0-9]*\\\\.?[0-9]+)[\\\\s]*Y([-+]?[0-9]*\\\\.?[0-9]+)[\\\\s]*)+"; List若模式字串裡（）太多，或是覺得用INDEX標定群組可讀性太差，此時可以套入具名群組（Named Group）的概念，把（）所圈住的Symbol具名化：__coords = new List (); Match __matchUnnamed = Regex.Match(__input,__patternUnnamed); //----------------------------------- // Unnamed //----------------------------------- __coords.Clear(); for (int i = 0; i < __matchUnnamed.Groups[1].Captures.Count;i++) { // use X,Y group restore each coordinates float[] eachCoord = new float[]{0,0}; eachCoord[0] = float.Parse(__matchUnnamed.Groups[2].Captures[i].Value); eachCoord[1] = float.Parse(__matchUnnamed.Groups[3].Captures[i].Value); __coords.Add(eachCoord); } //check all coordinates Console.WriteLine(\"Unnamed\"); foreach (float[] item in __coords) { Console.WriteLine(String.Format(\"{0},{1}\", item[0], item[1])); }
String __patternNamed = "Model:[\\\\w]+[\\\\s]+Coordinates:[\\\\s]+(?X(? [-+]?[0-9]*\\\\.?[0-9]+)[\\\\s]*Y(? [-+]?[0-9]*\\\\.?[0-9]+)[\\\\s]*)+"; Match __matchNamed = Regex.Match(__input,__patternNamed); //----------------------------------- // Named //----------------------------------- //now we get the \"coord\" group __coords.Clear(); for (int i = 0; i < __matchNamed.Groups[\"coord\"].Captures.Count; i++) { // use X,Y group restore each coordinates float[] eachCoord = new float[]{0,0}; eachCoord[0] = float.Parse(__matchNamed.Groups[\"X\"].Captures[i].Value); eachCoord[1] = float.Parse(__matchNamed.Groups[\"Y\"].Captures[i].Value); __coords.Add(eachCoord); }
class utilities
{
/// <summary>
/// Used to store key-serializer
/// </summary>
/// <returns></returns>
private static Hashtable __dictionary = new Hashtable();
/// <summary>
/// Generate key according to contents of type list
/// </summary>
/// <param name="typeList"></param>
/// <returns></returns>
protected static int generateKey(List<Type> typeList)
{
//hash code summarize
return typeList.Sum(__type => __type.GetHashCode());
}
/// <summary>
/// Always fetch serializer from this function
/// (Never allocate by yourself)
/// </summary>
/// <param name="mainType"></param>
/// <param name="extraTypes"></param>
/// <returns></returns>
public static XmlSerializer getSerializer(Type mainType,Type[] extraTypes){
//merge the list
List<Type> __typeList = new List<Type>();
__typeList.Add(mainType);
__typeList.AddRange(extraTypes);
var key = generateKey(__typeList);
if (__dictionary.ContainsKey(key))
{
// this kind of serializer had been cached/used before ,
// get the cached serializer
return (XmlSerializer)__dictionary[key];
}
else
{
// never been used , need to create a new one and push into cache
XmlSerializer __serializer = new XmlSerializer(mainType,extraTypes);
__dictionary.Add(key,__serializer);
return __serializer;
}
}//getserializer
}//utilities
<project sdk="Microsoft.NET.Sdk">
<propertygroup>
<outputtype>Exe</outputtype>
<targetframework>netcoreapp1.1</targetframework>
</propertygroup>
<itemgroup>
<packagereference include="System.Collections" version="4.3.0">
<packagereference include="System.Collections.NonGeneric" version="4.3.0">
<packagereference include="System.Runtime.Extensions" version="4.3.0">
<packagereference include="System.Xml.XmlSerializer" version="4.3.0">
</packagereference></packagereference></packagereference></packagereference></itemgroup>
</project>
class stringUIEditor :
UITypeEditor
{
public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
{
return UITypeEditorEditStyle.Modal;
}
public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value)
{
Form __form = new Form(); // allocating a form , used to show-up editable facility
TextBox __tb = new TextBox();
__form.Controls.Add(__tb);
__form.AutoSize=true;
__form.ShowDialog(); // show-up the form
return __tb.Text; //return the text value the user just input.
}
}
 |
| 從(...)呼喚的UIEditor |
 |
| PropertyGrid各顯示樣式控制對應屬性 |
class optionEnumConvertor :
EnumConverter
{
/// <summary>
/// Convert From String To Enum Type
/// </summary>
/// <param name="context" />
/// <param name="culture" />
/// <param name="value" />
/// <returns></returns>
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
switch (value.ToString())
{
case "選項1":
return MyEnum.OPTION1;
case "選項2":
return MyEnum.OPTION2;
default:
return null;
}
}
/// <summary>
/// Convert From Enum Type To String Type
/// </summary>
/// <param name="context" />
/// <param name="culture" />
/// <param name="value" />
/// <param name="destinationType" />
/// <returns></returns>
public override object ConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
switch ((MyEnum)value)
{
case MyEnum.OPTION1:
return "選項1";
case MyEnum.OPTION2:
return "選項2";
default:
return null;
}
}
public optionEnumConvertor(Type type):base(type)
{
}
}
[DisplayName("想要選什麼？")] // much more human-readable?
[TypeConverter(typeof(optionEnumConvertor))]
public MyEnum Property3 { get; set; }
[TypeConverter(typeof(optionEnumConvertor))]
enum MyEnum
{
OPTION1,
OPTION2,
}
 |
| Enum轉String |