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一、前言

Unity项目开发中，遇到bug的时候，我们一般是通过日志来定位问题，所以写日志到本地文件，或者把日志文件上传到web服务器这样的功能就很必要了。下面就介绍下如何实现日志写入本地文件和上传本地日志文件到web服务器。

二、运行效果

三、Unity场景

创建场景，创建UI界面

四、Main.cs代码

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;using UnityEngine.Networking;using System.IO;using System.Text;public class Main : MonoBehaviour {
   	public Button writeLogBtn;	public Text logText;	public Text progressLbl;	public Slider progressSlider;	public Button uploadBtn;	const string UPLOAD_URL = "你上传日志的Http接口URL";	string m_logFileSavePath;	StringBuilder m_logStr = new StringBuilder();	void Awake () 	{
   		m_logFileSavePath = string.Format("{0}/output.log", Application.persistentDataPath);		Application.logMessageReceived += LogCallBack;		writeLogBtn.onClick.AddListener (() => {
   			Debug.Log("write log test");		});		uploadBtn.onClick.AddListener (() => {
   			byte[] data = ReadLogFile();			Debug.Log(data.Length);			StartCoroutine(HttpPost(UPLOAD_URL, data));		});	}	// 输出日志回调	void LogCallBack(string condition, string stackTrace, LogType type)	{
   		m_logStr.Append (condition);		m_logStr.Append ("\n");		m_logStr.Append (stackTrace);		m_logStr.Append ("\n");		logText.text += m_logStr.ToString ();		WriteLogToFile ();	}	// 将日志写入本地文件中	void WriteLogToFile()	{
   		if (m_logStr.Length <= 0) return;		if (!File.Exists (m_logFileSavePath)) 		{
   			var fs = File.Create (m_logFileSavePath);			fs.Close ();		}		using (var sw = File.AppendText (m_logFileSavePath)) 		{
   			sw.WriteLine (m_logStr.ToString ());			m_logStr.Remove (0, m_logStr.Length);		}	}		// 读取日志文件的字节流	byte[] ReadLogFile()	{
   		byte[] data = null;		using (FileStream fs = File.OpenRead (m_logFileSavePath)) {
   			int index = 0;			long len = fs.Length;			data = new byte[len];			int offset = data.Length > 1024 ? 1024 : data.Length;			while (index < len) {
   				int readByteCnt = fs.Read (data, index, offset);				index += readByteCnt;				long leftByteCnt = len - index;				offset = leftByteCnt > offset ? offset : (int)leftByteCnt;			}			Debug.Log ("Read Done");		}		return data;	}	// 将日志字节流上传到web服务器	IEnumerator HttpPost(string url, byte[] data)	{
   		WWWForm form = new WWWForm ();		form.AddField ("desc", "test upload log file");		form.AddBinaryData ("errlog", data, "test_log.txt", "application/x-gzip");		// 使用UnityWebRequest		UnityWebRequest request = UnityWebRequest.Post (url, form);		var result = request.Send ();		if (request.isError) {
   			Debug.LogError (request.error);		}		while (!result.isDone) {
   			yield return null;			// 更新上传日志进度条			progressSlider.value = request.uploadProgress;			progressLbl.text = request.uploadProgress * 100 + "%";			Debug.Log ("result.progress: " + request.uploadProgress);		}		Debug.Log ("finish upload, http return msg: \n" + request.downloadHandler.text);	}}

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