Question

我需要获取磁盘几何信息，但有些错误，DeviceIoControl返回false。任何想法如何解决它？或者其他使用C＃和kernel32的例子表示赞赏。

 [DllImport("kernel32.dll")]
            public static extern IntPtr CreateFile(
            string lpFileName, int dwDesiredAccess, int dwShareMode,
            IntPtr lpSecurityAttributes, int dwCreationDisposition,
            int dwFlagsAndAttributes, IntPtr hTemplateFile);

            private const int FILE_SHARE_READ = 1;
            private const int OPEN_ALWAYS = 4;
            private const int INVALID_HANDLE_VALUE = -1;

            [DllImport("kernel32.dll", ExactSpelling = true)]
            internal static extern bool DeviceIoControl(
            IntPtr hDevice, int dwIoControlCode, IntPtr lpInBuffer, int nInBufferSize,
            IntPtr lpOutBuffer, int nOutBufferSize, ref int lpBytesReturned, IntPtr lpOverlapped);

            private const int IOCTL_DISK_GET_MEDIA_TYPES = 0x00070c00;

            static void Main(string[] args)
            {
                IntPtr hflp = CreateFile(@""\\.\C:", 0, FILE_SHARE_READ, IntPtr.Zero, OPEN_ALWAYS, 0, IntPtr.Zero);
                if ((int)hflp == INVALID_HANDLE_VALUE)
                { Console.WriteLine("CreateFile failed"); return; }

                Type ts = typeof(DISK_GEOMETRY);
                int ss = Marshal.SizeOf(ts);
                int ssa = ss * 20;
                IntPtr mptr = Marshal.AllocHGlobal(ssa);
                int byret = 0;
                bool ok = DeviceIoControl(hflp, IOCTL_DISK_GET_MEDIA_TYPES, IntPtr.Zero, 0,
                mptr, ssa, ref byret, IntPtr.Zero);
                if (!ok)
                { Console.WriteLine("DeviceIoControl failed"); return; }
                int count = byret / ss;
                int run = (int)mptr;
                DISK_GEOMETRY gem;
                for (int i = 0; i < count; i++)
                {
                    gem = (DISK_GEOMETRY)Marshal.PtrToStructure((IntPtr)run, ts);
                    Console.WriteLine("MediaType={0} SectorsPerTrack={1}", gem.MediaType, gem.SectorsPerTrack);
                    run += ss;
                }
                Marshal.FreeHGlobal(mptr);
            }

P.S我已经阅读了msdn帮助。

Answer 1

IOCTL_DISK_GET_MEDIA_TYPES似乎是遗产，不再受支持。至少在我的操作系统（Win7 x64）上就是这种情况。尝试使用DeviceIoControl致电IOCTL_DISK_GET_MEDIA_TYPES会导致错误代码1，ERROR_INVALID_FUNCTION。

我相信您需要使用IOCTL_STORAGE_GET_MEDIA_TYPES_EX代替。

我在这种情况下的建议是首先尝试从C ++调用API函数。这样你就不必为p / invoke而烦恼，而且你知道所有的结构和函数原型都是正确的。一旦你弄清楚如何调用特定的API函数，然后转换为p / invoke。

顺便说一句，你应该对你的p / invokes更加小心。请务必使用uint与DWORD匹配，并确保使用SetLastError=true，以便您可以使用Marshal.GetLastWin32Error()查询错误代码。

这样的事情：

[DllImport("kernel32.dll", SetLastError=true)]
public static extern IntPtr CreateFile(
    string lpFileName, uint dwDesiredAccess, uint dwShareMode,
    IntPtr lpSecurityAttributes, uint dwCreationDisposition,
    uint dwFlagsAndAttributes, IntPtr hTemplateFile);

[DllImport("kernel32.dll", SetLastError=true)]
internal static extern bool DeviceIoControl(
    IntPtr hDevice, uint dwIoControlCode, IntPtr lpInBuffer,
    uint nInBufferSize, IntPtr lpOutBuffer, uint nOutBufferSize, 
    ref uint lpBytesReturned, IntPtr lpOverlapped);

获取磁盘几何信息

1 个答案: