如何从一个设备使用USB获取文件文件、设备、USB

2023-09-08 08:47:57 作者：萝莉脸爷们心

我写一个WPF应用程序，希望得到进入一台数码相机，并且已经疯狂地周围的Googling解决方案和Im pretty的高兴如何将其所有的准备。

Im writing a WPF application that wants to get access to a digital camera, and have been madly Googling around for solutions and Im pretty happy with how its all going.

这是我目前所面对的：

    private const decimal WM_DEVICECHANGE = 0x0219;
    private const int DBT_DEVTYP_HANDLE = 6;
    private const int DBT_DEVNODES_CHANGED = 7;
    private const int BROADCAST_QUERY_DENY = 0x424D5144;
    private const int DBT_DEVICEARRIVAL = 0x8000; // system detected a new device
    private const int DBT_DEVICEQUERYREMOVE = 0x8001;   // Preparing to remove (any program can disable the removal)
    private const int DBT_DEVICEREMOVECOMPLETE = 0x8004; // removed 
    private const int DBT_DEVTYP_VOLUME = 0x00000002; // drive type is logical volume

    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);
        var mainFormWinInteropHelper = new System.Windows.Interop.WindowInteropHelper(this);
        System.Windows.Interop.HwndSource.FromHwnd(mainFormWinInteropHelper.Handle).AddHook(HwndHandler);
    }

    private IntPtr HwndHandler(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
    {
        ProcessWinMessage(msg, wparam, lparam);
        handled = false;
        return IntPtr.Zero;
    }

    private void ProcessWinMessage(int msg, IntPtr wparam, IntPtr lparam)
    {
        int deviceType;
        char driveLetter;

        if (msg == WM_DEVICECHANGE)
        {
            var int32 = wparam.ToInt32();

            switch (int32)
            {
                case DBT_DEVICEARRIVAL:
                    Console.WriteLine("Device Arrival");
                    break;
                case DBT_DEVICEQUERYREMOVE:
                    Console.WriteLine("Device Query Removed");
                    break;
                case DBT_DEVICEREMOVECOMPLETE:
                    Console.WriteLine("Device Removed");
                    break;
                case DBT_DEVNODES_CHANGED:
                    Console.WriteLine("Device added or removed");
                    break;
            }
        }
    }

这其实都是对我的数码相机的伟大工程，我能得到的照片关闭它。我要指出，在这个时候，当我插上我的相机，它出现在Windows下的可移动存储设备，它具有分配给它一个驱动器号。

This actually all works great for my digital camera and I can get the photos off it. I should note at this time that when I plug in my camera, it appears in windows under the "devices with removable storage", and it has a drive letter allocated to it.

然而，当我插在我的iPhone进行测试，iPhone不出现在该节中，并没有出现有关联的驱动器号...

However, when I plugged in my iPhone to test it, the iPhone does not appears under that section, and does not appear to have a drive letter associated to it...

但这里是我的主要问题，为什么Windows消息DBT_DEVNODES_CHANGED火的时候我加入了iPhone，但DBT_DEVICEARRIVAL消息触发时我添加了摄像头？

But here is my main question, why does the windows message DBT_DEVNODES_CHANGED fire when I add the iPhone, but the DBT_DEVICEARRIVAL message fires when I add the camera?

我将理想希望能够从任何USB设备获得文件，当用户它插入。

I would ideally like to be able to "get" files from any USB device when the user plugs it in.

有没有人有这样的经验吗？我的Win32编程是非常有限的...

Does anyone have any experience with this? My Win32 programming is very limited...

干杯，马克

如何从一个设备使用USB获取文件文件、设备、USB

推荐答案