Unity打开外部文件夹并选择文件

转载自：https://blog.csdn.net/pq8888168/article/details/85781908
1、OpenFileName脚本

// An highlighted block
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;

}

2、LocalDialog脚本

using System.Runtime.InteropServices;

public class LocalDialog
{
//链接指定系统函数       打开文件对话框
[DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
public static bool GetOFN([In, Out] OpenFileName ofn)
{
return GetOpenFileName(ofn);//执行打开文件的操作
}

//链接指定系统函数        另存为对话框
[DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
public static extern bool GetSaveFileName([In, Out] OpenFileName ofn);
public static bool GetSFN([In, Out] OpenFileName ofn)
{
return GetSaveFileName(ofn);//执行保存选中文件的操作
}
}

3、添加一个button点击事件 来开启方法
//Type输入*则是打开所有格式的文件

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;
using UnityEngine.UI;
public class CameraTest : MonoBehaviour
{

public Button button;
private void Awake()
{
button.GetComponent<Button>().onClick.AddListener(Open);
}

public void Open()
{
//这里输入*则是打开所有格式的文件
OpenDirectory("*");
}

public void OpenDirectory(string type)
{
OpenFileName2 openFileName = new OpenFileName2();
openFileName.structSize = Marshal.SizeOf(openFileName);
openFileName.filter = "文件(*." + type + ")\0*." + type + "*";
openFileName.file = new string(new char[256]);
openFileName.maxFile = openFileName.file.Length;
openFileName.fileTitle = new string(new char[64]);
openFileName.maxFileTitle = openFileName.fileTitle.Length;
openFileName.initialDir = Application.streamingAssetsPath.Replace('/', '\\');//默认路径
openFileName.title = "选择文件";
openFileName.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;

if (LocalDialog.GetSaveFileName(openFileName))//点击系统对话框框保存按钮
{
//TODO
Debug.Log("Selected file with full path:=========" + openFileName.file);  //显示点击文件路径
}
}