[游戏开发]Unity3D打开Windows文件夹浏览器

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;
    /// <summary>
    /// 文件路径
    /// </summary>
    public String file = null;
    public int maxFile = 0;
    /// <summary>
    /// 文件名
    /// </summary>
    public String fileTitle = null;
    public int maxFileTitle = 0;
    /// <summary>
    /// 打开对话框时的默认路径
    /// </summary>
    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 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);
    }

    //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);
    }
}

调用

private void OnGUI()
    {
        if (GUI.Button(new Rect(10, 10, 100, 50), "Open"))
        {
            OpenFileName openFileName = new OpenFileName();
            openFileName.structSize = Marshal.SizeOf(openFileName);
            openFileName.filter = "图片(*.jpg)\0*.jpg";//"All\0*.*\0Text\0*.TXT\0"
            openFileName.file = new string(new char[1024]);
            openFileName.maxFile = openFileName.file.Length;
            openFileName.fileTitle = new string(new char[64]);
            openFileName.maxFileTitle = openFileName.fileTitle.Length;
            //默认路径
            openFileName.initialDir = path;
            openFileName.title = "窗口";
            //0x00000200    ALLOWMULTISELECT   允许选择多个文件
            //具体含义见 https://docs.microsoft.com/zh-cn/windows/win32/api/commdlg/ns-commdlg-openfilenamea?redirectedfrom=MSDN
            openFileName.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008 | 0x00000200;
			
			//打开“选择单个文件”的对话框
            if (LocalDialog.GetOpenFileName(openFileName))
            {
                Debug.Log(openFileName.file);
                Debug.Log(openFileName.fileTitle);
            }
			
			//打开“保存至文件”的对话框
            if (LocalDialog.GetOpenFileName(openFileName))
            {
                Debug.Log(openFileName.file);
                Debug.Log(openFileName.fileTitle);
            }
        }
    }

其他
1.虽然为openFileName.flags添加上了0x00000200（ALLOWMULTISELECT），可以在对话框中选择多个文件夹，但不知道如何获取这些文件的文件名或路径。所以“选中多个文件”暂时不会搞。
2.OpenFileName.flags 的具体含义见 msdn（https://docs.microsoft.com/zh-cn/windows/win32/api/commdlg/ns-commdlg-openfilenamea?redirectedfrom=MSDN#members）的Members下的Flags相关表格。
3.github/UnityStandaloneFileBrowser（https://github.com/gkngkc/UnityStandaloneFileBrowser）。未测试。
4.只能在Unity 编辑器窗口内使用。未测试。

string[] fliter = { "图片或pdf", "jpg;*.png;*.jpeg;*.pdf" };
string path = UnityEditor.EditorUtility.OpenFilePanelWithFilters("Overwrite with png", "C:\\", fliter);
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原文链接：https://blog.csdn.net/weixin_39766005/article/details/103705178