Question

我一直在尝试使用FileSystemWatcher检测文件夹下载是否已完成的想法。到目前为止我所取得的成就是我能够检测到这个文件夹的创建，然后触发一个监视器，监视这个观察者内部的变化。每当在此文件夹中创建文件时，我将尝试访问它并检查它是否已锁定。

问题是：如何知道此文件夹中的所有文件都已写完？

我知道我可以单独处理每个文件，但是如何从那个文件转到全包结果？

我需要这个，因为在完全写完文件夹之后，我会将其存档，并将其上传到FTP。

这是我现在的代码：

static void OnChanged( Object^ /*source*/, FileSystemEventArgs^ e )
{   

    Console::WriteLine( "File: {0} {1}", e->FullPath, e->ChangeType );

    FileSystemWatcher^ watcher2 = gcnew FileSystemWatcher;
    watcher2->Path = e->FullPath;
    watcher2->NotifyFilter = static_cast<NotifyFilters>( NotifyFilters::LastWrite | NotifyFilters::DirectoryName |NotifyFilters::FileName);
    watcher2->Filter = "*.*";
    watcher2->Changed += gcnew FileSystemEventHandler(OnChanged2);
    watcher2->EnableRaisingEvents = true;


}

static void OnChanged2(Object^ /*source*/, FileSystemEventArgs^ e )
{

Console::WriteLine( "Watching started", e->FullPath);

FileInfo^ fileInfo = gcnew FileInfo(e->FullPath);
while(IsFileLocked(fileInfo))
{
    Thread::Sleep(500);
}

}

static bool IsFileLocked(FileInfo^ file)

{ FileStream ^ stream = nullptr;

try
{
    stream = file->Open(System::IO::FileMode::Open, 
        System::IO::FileAccess::ReadWrite, System::IO::FileShare::None);
}
catch (IOException^ ex)
{
    //the file is unavailable because it is:
    //still being written to
    //or being processed by another thread
    //or does not exist (has already been processed)
    return true;
}
finally
{
    if (stream != nullptr)
        stream->Close();
}

//file is not locked
return false;

}

感谢您的帮助！

FileSystemWatcher监视文件夹下载完成

0 个答案: