网上有两个常用的方法，我先用了第一种。

第一种方法：

需要注意三点，首先导入system.window.Forms.dll库，导进去后一定记得要修改playersetting下的optimization->API compatibility level为.NET 2.0，至于为什么改成这样，可以参考unity3d 的解释：http://game.ceeger.com/Manual/MobileDotnet.html。

还要注意一点：加载的本地图片地址一定不能带有中文路径

另外，www新建的时候要加上“file://” + url;

WWW www = new WWW("file://" + url); //注意要加上"file://"

只需要一个脚本，其中代码如下：

using UnityEngine;

using System.Collections;

using System.Windows.Forms;

using System.IO;

public class UploadImg: MonoBehaviour {

public Texture2D img = null;

void OnGUI()

{

if (GUI.Button(new Rect(0, 0, 100, 20), "选择文件"))

{

OpenFileDialog od = new OpenFileDialog();

od.Title = "请选择头像图片";

od.Multiselect = false;

od.Filter = "图片文件(*.jpg,*.png,*.bmp)|*.jpg;*.png;*.bmp";

if (od.ShowDialog() == DialogResult.OK)

{

Debug.Log(od.FileName);

StartCoroutine(GetTexture(od.FileName));

}

}

if (img != null)

{

GUI.DrawTexture(new Rect(0, 20, img.width/2, img.height/2), img);

}

}

IEnumerator GetTexture(string url)

{

WWW www = new WWW("file://" + url); //注意要加上"file://"

yield return www;

if (www.isDone)

{

img = www.texture;

}

}

}

效果是这样的，但是感觉和win7风格差的太远

第二种方法看起来要炫多了：

需要两个脚本。

OpenFileName.cs如下：

using UnityEngine;

using System.Collections;

using System;

using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

public class OpenFileName

{

public int structSize = 0;

public IntPtr dlgOwner = IntPtr.Zero;

public IntPtr instance = IntPtr.Zero;

public String filter = null;

public String customFilter = null;

public int maxCustFilter = 0;

public int filterIndex = 0;

public String file = null;

public int maxFile = 0;

public String fileTitle = null;

public int maxFileTitle = 0;

public String initialDir = null;

public String title = null;

public int flags = 0;

public short fileOffset = 0;

public short fileExtension = 0;

public String defExt = null;

public IntPtr custData = IntPtr.Zero;

public IntPtr hook = IntPtr.Zero;

public String templateName = null;

public IntPtr reservedPtr = IntPtr.Zero;

public int reservedInt = 0;

public int flagsEx = 0;

}

public class WindowDll

{

[DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]

public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);

public static bool GetOpenFileName1([In, Out] OpenFileName ofn)

{

return GetOpenFileName(ofn);

}

}

UploadImage.cs如下：

using UnityEngine;

using System.Collections;

using System.Runtime.InteropServices;

public class Upload : MonoBehaviour {

public Texture2D img = null;

private bool click = false;

void OpenDialog()

{

click = true;

}

void EnterImage()

{

OpenFileName ofn = new OpenFileName();

ofn.structSize = Marshal.SizeOf(ofn);

ofn.filter = "All Files\0*.*\0\0";

ofn.file = new string(new char[256]);

ofn.maxFile = ofn.file.Length;

ofn.fileTitle = new string(new char[64]);

ofn.maxFileTitle = ofn.fileTitle.Length;

ofn.initialDir = UnityEngine.Application.dataPath;//默认路径

ofn.title = "Open Project";

ofn.defExt = "JPG";//显示文件的类型

//注意 一下项目不一定要全选 但是0x00000008项不要缺少

ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR

if(WindowDll.GetOpenFileName(ofn))

{

StartCoroutine(GetTexture(ofn.file));

}

}

IEnumerator GetTexture(string url)

{

WWW wwwTexture = new WWW ("file://" + url);

yield return wwwTexture;

if(wwwTexture.isDone)

img = wwwTexture.texture;

}

void OnGUI()

{

if(click)

{

EnterImage();

click = false;

}

if (img != null)

GUI.DrawTexture (new Rect(Screen.width/2 - img.width/2,Screen.height/2 - img.height,img.width,img.height),img);

}

}