Unity's C # uses callback functions to implement anonymous functions for C + +

The use of anonymous functions for C + + development is very useful, but how can C # development be implemented? A few days ago to do a photo function, I stumbled across a function if it is C + +, with anonymous function too good, so began to study C # callback, Proxy, commissioned, and finally is to achieve what I want it, do not know what to call. The words of the great God can be evaluated. Reference article: Detailed C # delegate, event and callback functions
Unity3d Research Institute using C # to implement proxy mode (40)
Directly on the code bar, no nonsense. Class A is the definition class for a delegate, and Class B is a class that invokes a delegate (an anonymous function).

Using unityengine;using system.collections;public class aclass{public delegate void OnComplete (Sprite sprite);p ublic IEnumerator GetTexture (OnComplete callback) {//savetexture2d t=new texture2d (screen.width, (int) (Screen.width*aspect ); T.readpixels (New Rect (0,0,screen.width, (int) (screen.width*aspect)), 0,0,false); t.apply (); byte[] byt = t. Encodetopng (); m_photoname = time.time+ ". png"; M_photopath = Globe.persistentdataurl+m_photoname;debug. Log ("System.io++++++++start writepng"); System.IO.File.WriteAllBytes (M_photopath.replace ("file://", ""), byt);D Ebug. Log ("m_photopath=" +m_photopath)//load imagewww www = new www (m_photopath); yield return www;//callback callback (sprite);}}

Using unityengine;using system.collections;public class bclass{public void Executecallback () {Startcoroutine (m_ Webcamera.gettexture (Delegate (Sprite sp) {watermark.gameObject.SetActive (false);p hotoimg.sprite=sp;}));}}

A class defines a delegate that is used for callbacks, which is the Sprite class to pass, and the GetTexture method is used to intercept the screen.
Class B is called, when Class B calls the Class A screenshot method, you can directly through the delegate (Sprite SP) anonymous function to obtain the image of the SP, should be a class in the screenshot method, using the WWW asynchronous loading, so the photoimg in class B to the wizard assignment is also asynchronous. * * Note, under normal circumstances, do not need to write the Startcoroutine (), then the code is simple to change it OK

Using unityengine;using system.collections;public class bclass{public void Executecallback () {//startcoroutine (); m_ Webcamera.gettexture (Delegate (Sprite sp) {watermark.gameObject.SetActive (false);p hotoimg.sprite=sp;});}}

However, in general the use of anonymous functions, most people would like to use asynchronous, this time startcoroutine () must be used in the invocation, that is, in class B called. If Startcortine () is not used in class B and is used in Class A
That is, call the Class A screenshot method in class B

public void Executecallback () {//startcoroutine (); M_webcamera.gettexture (delegate (Sprite sp); m_ Webcamera.gettexture (Delegate (Sprite sp) {watermark.gameObject.SetActive (false);p hotoimg.sprite=sp;});}

In a class of screenshots using the Startcoroutine () method to enable asynchronous, there will be a null pointer exception, which I encountered during the use of the problem, bothered me for a while, I hope everyone attention!!!

Using unityengine;using system.collections;public class aclass{public delegate void OnComplete (Sprite sprite);p ublic void GetTexture (OnComplete callback) {Startcoroutine (Screencapture (callback));} Public IEnumerator Screencapture (OnComplete callback) {//savetexture2d t=new texture2d (screen.width, (int) ( Screen.width*aspect)); T.readpixels (New Rect (0,0,screen.width, (int) (screen.width*aspect)), 0,0,false); t.Apply (); byte[] byt = T.encodetopng (); m_photoname = time.time+ ". png"; M_photopath = Globe.persistentdataurl+m_photoname;debug. Log ("System.io++++++++start writepng"); System.IO.File.WriteAllBytes (M_photopath.replace ("file://", ""), byt);D Ebug. Log ("m_photopath=" +m_photopath)//load imagewww www = new www (m_photopath); yield return www;//callback callback (sprite);}}

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Unity's C # uses callback functions to implement anonymous functions for C + +