75 lines
3.4 KiB
C#
75 lines
3.4 KiB
C#
using System.Runtime.InteropServices;
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using System;
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/*这是C#引用非托管的C/C++的DLL的一种定义定义结构体的方式，主要是为了内存中排序，LayoutKind有两个属性Sequential和Explicit
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Sequential表示顺序存储，结构体内数据在内存中都是顺序存放的Explicit表示精确布局，需要用FieldOffset()设置每个成员的位置这都是
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为了使用非托管的指针准备的，CharSet=CharSet.Ansi表示编码方式
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*/
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
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public struct OpenFileName
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{
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public int structSize; //结构的内存大小
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public IntPtr dlgOwner; //设置对话框的句柄
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public IntPtr instance; //根据flags标志的设置，确定instance是谁的句柄，不设置则忽略
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public string filter; //调取文件的过滤方式
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public string customFilter; //一个静态缓冲区 用来保存用户选择的筛选器模式
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public int maxCustFilter; //缓冲区的大小
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public int filterIndex; //指向的缓冲区包含定义过滤器的字符串对
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public string file; //存储调取文件路径
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public int maxFile; //存储调取文件路径的最大长度 至少256
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public string fileTitle; //调取的文件名带拓展名
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public int maxFileTitle; //调取文件名最大长度
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public string initialDir; //最初目录
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public string title; //打开窗口的名字
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public int flags; //初始化对话框的一组位标志 参数类型和作用查阅官方API
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public short fileOffset; //文件名前的长度
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public short fileExtension; //拓展名前的长度
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public string defExt; //默认的拓展名
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public IntPtr custData; //传递给lpfnHook成员标识的钩子子程的应用程序定义的数据
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public IntPtr hook; //指向钩子的指针。除非Flags成员包含OFN_ENABLEHOOK标志，否则该成员将被忽略。
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public string templateName; //模块中由hInstance成员标识的对话框模板资源的名称
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public IntPtr reservedPtr;
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public int reservedInt;
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public int flagsEx; //可用于初始化对话框的一组位标志
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}
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public class WindowDll
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{
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[DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
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public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
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}
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public class OpenFile
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{
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public static string[] OpenFileWin()
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{
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//初始化
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OpenFileName ofn = new OpenFileName();
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ofn.structSize = Marshal.SizeOf(ofn);
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//ofn.filter = "All Files\0*.*\0\0";
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ofn.filter = "图片(*.png;*.jpg;*.jpeg;)\0\0音频(*.mp3;)\0\0视频(*.mp4;*.mov;*.avi;)\0\0";
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ofn.file = new string(new char[1024]);
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ofn.maxFile = ofn.file.Length;
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ofn.fileTitle = new string(new char[64]);
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ofn.maxFileTitle = ofn.fileTitle.Length;
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//ofn.initialDir = path; //默认路径
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ofn.title = "媒体选择";
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ofn.defExt = "png,jpg,jpeg,mp3,mp4,mov,avi";//显示文件的类型
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//注意 一下项目不一定要全选 但是0x00000008项不要缺少
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ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR
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//判断是否打开文件
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if (WindowDll.GetOpenFileName(ofn))
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{
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//多选文件
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string[] Splitstr = { "\0" };
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string[] strs = ofn.file.Split(Splitstr, StringSplitOptions.RemoveEmptyEntries);
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return strs;
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}
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else
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{
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return null;
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}
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}
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}
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