Question

我正在尝试从user32获取监视器的名称。到目前为止，我所获得的全部都是汉字。我不确定为什么会有所帮助。

    public static SafeNativeMethods.DISPLAY_DEVICE GetDevices()
    {
        SafeNativeMethods.DISPLAY_DEVICE d = new SafeNativeMethods.DISPLAY_DEVICE();
        d.Initialize();
        if (SafeNativeMethods.EnumDisplayDevices(null, 1, ref d, 0))
            return d;
        else
            throw new InvalidOperationException(GetLastError());
    }

public static class SafeNativeMethods
{
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct DISPLAY_DEVICE
    {
        [MarshalAs(UnmanagedType.U4)]
        public int cb;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string DeviceName;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string DeviceString;
        [MarshalAs(UnmanagedType.U4)]
        public int StateFlags;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string DeviceID;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string DeviceKey;
        public void Initialize()
        {
            this.DeviceName = new string(new char[32]);
            this.DeviceString = new string(new char[128]);
            this.DeviceID = new string(new char[128]);
            this.DeviceKey = new string(new char[128]);
            this.cb = (ushort)Marshal.SizeOf(this);
        }
    }



        [DllImport("User32.dll", SetLastError = true, BestFitMapping = false, ThrowOnUnmappableChar = true)]
        public static extern Boolean EnumDisplayDevices(
            [param: MarshalAs(UnmanagedType.LPTStr)]
            String lpDevice,
            [param: MarshalAs(UnmanagedType.U4)]
            Int32 iDevNum,
            [In, Out]
            ref DISPLAY_DEVICE lpDisplayDevice,
            [param: MarshalAs(UnmanagedType.U4)]
            Int32 iHaveNoIdea
        );
}

此代码返回设备名称屜尮䥄偓䅌㉙，任何人都可以解释为什么以及如何从中获取常规名称吗？

Answer 1

“汉字” usually means you tried to interpret a ASCII string as Unicode（UTF-16）。

尝试将CharSet属性添加到您的EnumDisplayDevices声明中。

从user32.dll EnumDisplayDevices找回错误的字符串

1 个答案: