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我在 C# 中为 QuickUsb 编写了一个包装类来访问非托管库。有关完整的实现，请参阅此要点。

这个问题的主要兴趣点是以下部分：

public class QuickUsbPort
{
    private class SafeQuickUsbHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        [DllImport("QuickUsb.dll", CharSet = CharSet.Ansi)] static extern
            int QuickUsbClose(IntPtr handle);

        public SafeQuickUsbHandle(IntPtr handle) : base(true)
        {
            SetHandle(handle);
        }

        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        protected override bool ReleaseHandle()
        {
            return QuickUsbClose(handle) != 0;
        }
    }

    private static class NativeLib
    {
        [DllImport("QuickUsb.dll", CharSet = CharSet.Ansi)] static extern
            int QuickUsbOpen(out SafeQuickUsbHandle handle, string deviceName);

        public static SafeQuickUsbHandle Open(string deviceName)
        {
            if (QuickUsbOpen(out SafeQuickUsbHandle handle, deviceName) == 0)
            {
                throw …