使用图表获取大型Facebook视频缩略图

Question

我想使用图表获取大型facebook视频缩略图。下面的代码获取小缩略图

https://graph.facebook.com/VIDEO_ID/picture

此代码将返回Ex：

https://fbcdn-vthumb-a.akamaihd.net/hvthumb-ak-prn1/632393_10151574602254838_10151574598089838_34404_282_t.jpg

如果我用“n”替换“t”，我将得到大图像

https://fbcdn-vthumb-a.akamaihd.net/hvthumb-ak-prn1/632393_10151574602254838_10151574598089838_34404_282_n.jpg

但是如何使用facebook图表获取它或使用php

将“t”替换为“n”

提前致谢。

Answer 1

你可以使用这个PHP代码，它适用于我。

    using System;
    using System.Collections.Generic;
    using System.Diagnostics;
    using Microsoft.VisualStudio.TestTools.UnitTesting;

    namespace UnitTestProject35
    {
        [TestClass]
        public class UnitTest1
        {
            [TestMethod]
            public void TestSuccessParse()
            {
                HttpResponseCode parsedHttpCode = HttpResponseCode.Unknown;
                parsedHttpCode.TryParse(200, out parsedHttpCode);

                Assert.AreEqual(parsedHttpCode, HttpResponseCode.Success);
            }

            [TestMethod]
            public void TestServerErrorParse()
            {
                HttpResponseCode parsedHttpCode = HttpResponseCode.Unknown;
                parsedHttpCode.TryParse(500, out parsedHttpCode);

                Assert.AreEqual(parsedHttpCode, HttpResponseCode.AllServerErrors);
            }                
        }

        public enum HttpResponseCode
        {
            Unknown = 0,
            Success = 200,
            MissingParameter = 400,
            //etc...

            AllServerErrors = -1,
            InternalServerError = 500,
            NotImplemented = 501,
            BadGateway = 502,
            //etc..        
        }

        public static class EnumExtensions
        {
            public static void TryParse(this HttpResponseCode theEnum, int code, out HttpResponseCode result)
            {
                if (code >= 500 && code <= 599)
                {
                    result = HttpResponseCode.AllServerErrors;                
                }
                else
                {
                    result = (HttpResponseCode)Enum.Parse(typeof(HttpResponseCode), code.ToString());
                }                                        
            }
        }
    }