Question

我怀疑是否有任何方法可以自动了解其他程序是否未使用特定文件。让我更好地解释这个想法。

我有一个由其他软件打开和使用的文件，我想知道MATLAB是否该文件已被软件使用，然后随心所欲。到目前为止，我有一个临时解决方案，如果文件没有改变权重，则会检查每个句点，但此解决方案会进行不必要的搜索。

顺便感谢！

Answer 1

如果您使用的是Windows，并且您正在运行最近发布的支持.NET 的matlab（更新近r2009a，据我所知），这里有一个快速解决方案让一些{ {3}}对象监视器为您更改并在需要时发送适当的通知：

%% --- Watch for file events in some directory 
function [watchers] = WatchFolder(name)
%[
    % Get folder's name
    if (exist(name, 'dir'))
        folder = name;
    elseif (exist(name, 'file'))
        fullFilename = which(name);
        [folder, ~, ~] = fileparts(fullFilename);    
    else
        error('Argument must be a file or folder');
    end

    % Create file system watcher object
    fileObj = System.IO.FileSystemWatcher(folder);
    fileObj.EnableRaisingEvents = true;

    % Select events to monitor for
    filter = bitor(System.IO.NotifyFilters.FileName, System.IO.NotifyFilters.DirectoryName);
    filter = bitor(filter, System.IO.NotifyFilters.Attributes);
    filter = bitor(filter, System.IO.NotifyFilters.Size);
    filter = bitor(filter, System.IO.NotifyFilters.LastWrite);
    filter = bitor(filter, System.IO.NotifyFilters.LastAccess);
    filter = bitor(filter, System.IO.NotifyFilters.CreationTime);
    filter = bitor(filter, System.IO.NotifyFilters.Security);
    fileObj.NotifyFilter = filter;

    % Add listeners (Need to be kept alive in scope)
    watchers.Changed = addlistener(fileObj, 'Changed', @onFolderModification); 
    watchers.Created = addlistener(fileObj, 'Created', @onFolderModification); 
    watchers.Deleted = addlistener(fileObj, 'Deleted', @onFolderModification); 
    watchers.Renamed = addlistener(fileObj, 'Renamed', @onFolderModification); 
%]

%% --- This event is raise on any folder modification and as long as listeners are alive
function [] = onFolderModification(source, args) %#ok<INUSL>
%[
     fprintf('%s: %s\n', char(args.ChangeType.ToString()), char(args.Name));
%]

小心，这只是测试代码，你需要让监听器保持活着继续接收事件......由你来适应你的情况（插入gui，只看一些特定的文件，检查文件是否（s）是否正在使用或未收到通知等...）。

以下是我的命令窗口中使用当前测试代码的一些日志：

>> wf= WatchFolder('C:\Users\CitizenInsane\Desktop');

Created: Nouveau Microsoft Word Document.docx
Renamed: MyDocument.docx
Changed: MyDocument.docx
Created: ~$Document.docx
Changed: ~$Document.docx
Created: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Changed: ~WRD0000.tmp
Renamed: ~WRL0001.tmp
Renamed: MyDocument.docx
Changed: ~WRL0001.tmp
Changed: MyDocument.docx
Changed: MyDocument.docx

>> clear wf; % Stops receiving events (i.e. listeners no longer referenced)

使用MATLAB控制文件

1 个答案: