file scanner in maui,need used with mkfilepicker nuget package.only support android and windows
To use this package normal,add MkFilePicker NugetPackage to you maui project.
为了正常使用该包，需要先安装MKFilePicker包到你的Maui项目上.
1.Scan file via folder:
通过挑选的文件夹扫描
on windows, you must provider a folder to scan,you can use MkFilePicker nuget package to pick a folderer or get from Environment.getxxxfolder or somehting else
在windows上，你必须提供一个文件夹用来扫描，可以使用MkFilePicker挑选一个文件夹来扫描或者使用Environment相关api获取文件夹或者其他获得文件夹的方法
private async Task Scan()
{
var res = await MKFilePicker.MKFilePicker.PickFolderAsync(null).ConfigureAwait(false);
if (res != null)
{
MKFileScanner.MKFileScanner.Scan(res.PlatformPath,null, OnFileScanned);
}
}
async void OnFileScanned(FileResult fileResult)
{
//open scanned file
//打开扫描的文件
using (var stream = MKFilePicker.MKFilePicker.OpenPickedFile(fileResult.PlatformPath, "r"))
{
Debug.WriteLine($"{fileResult.FileName},{fileResult.PlatformPath},{fileResult.AbsolutePath},{fileResult.FileSize},{stream.Length}");
}
//read metadata of scanned file
//读取扫描文件的元数据
var map = await MKFileScanner.MKFileScanner.ReadMetadataAsync(fileResult.PlatformPath);
if(map != null)
{
//map.Name
//map.CreateTime
}
if (map is AudioMetadataMap audio)
{
//audio.SampleRate
//audio.Artist
}
else if(map is VideoMetadataMap video)
{
//video.Resolution
}
else if(map is ImageMetadataMap image)
{
//image.Width
//image.Height
}
}
2.scan without a folder
直接扫描
this only work on android,and you need take read/writeExternalStorgae permission
只有安卓能这样做，而且你必须获得读写外部权限
var status = await Permissions.CheckStatusAsync();
if (status != PermissionStatus.Granted)
{
status = await Permissions.RequestAsync();
if (status != PermissionStatus.Granted)
{
//未获取到权限
}
}
var options = new FileScanOption
{
FileType = FileType.Video,
//可以对文件名进行条件筛选，支持的语句将会转化为sql条件语句,不支持的将在扫描后过滤
//FileNameExpression = s => s.StartsWith("S")
};
await Task.Run(() => MKFileScanner.MKFileScanner.Scan(null, options, OnFileScanned));
you can set FileScanOption.FileType to set which collection you want to scan
你可以设置FileType的值来设置你想扫描哪个集合
3,scan file use option
对扫描结果过滤
limit file extension
限制文件拓展名
var options = new FileScanOption();
options.Extensions = new string[] { "jpg", "png" };
filter file name
筛选文件名
options.FileNameExpression = s => s.StartsWith("S");
file size bigger than 1kB and create time less one day
筛选文件大于1kB且一天以内创建的
options.MinFileSize = 1000;
options.MinCreateTime = DateTime.Now - TimeSpan.FromDays(1);