Question

出于学习目的，我想将一些C代码移植到C＃。我已经移植了一些代码，但是这个代码给了我很大的麻烦。如何将此代码转换为C＃？

typedef enum
{
    PXA_I2C_FAST_SPEED = 1,
    PXA_I2C_NORMAL_SPEED
} PXA_I2C_SPEED_T;

typedef enum
{
    I2C_OPCODE_READ             =   1,
    I2C_OPCODE_WRITE            =   2,
    I2C_OPCODE_READ_ONESTOP     =   3,
    I2C_OPCODE_WRITE_ONESTOP    =   4,
} PXA_I2C_OPERATION_CODE;

typedef struct
{
    /* input: */
    DWORD           mTransactions;
    PXA_I2C_SPEED_T mClkSpeed;
    UCHAR           mDeviceAddr;  //7 bit
    PXA_I2C_OPERATION_CODE          *mOpCode;
    DWORD           *mBufferOffset;
    DWORD           *mTransLen;
    /* output: */
    //DWORD         mErrorCode;
    UCHAR           *mBuffer;
} PXA_I2CTRANS_T;

然后在某处稍后将结构PXA_I2CTRANS_T与DeviceIoControl一起使用，如下所示：

DeviceIoControl (hDevice, IOCTL_I2C_TRANSACT, NULL, 0, pTrans, sizeof(PXA_I2CTRANS_T), &BytesWritten, NULL);

我必须使用IntPtr吗？我是否必须将ClockSpeed转换为DeviceAddress（因为DeviceAddress应该是7位，但在C＃中它是8位）？为什么结构使用像输出缓冲区，显然需要发送（使用保留内存来存储输出）？

我现在拥有的只是：

    [DllImport("coredll.dll", SetLastError = true)]
    private static extern bool DeviceIoControl(
        IntPtr hDevice,
        uint dwIoControlCode,
        IntPtr InBuffer,
        uint nInBufferSize,
        [In, Out] IntPtr OutBuffer,
        uint nOutBufferSize,
        IntPtr pBytesReturned,
        IntPtr lpOverlapped);

    public enum Speed
    {
        Fast = 1,
        Slow
    }

    public enum OperationCode
    {
        Read = 1,
        Write = 2,
        ReadOneStop = 3,
        WriteOneStop = 4
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct TransactionData
    {
        public uint Transactions;
        public I2cDevice.Speed ClockSpeed;
        public byte DeviceAddress;

        public IntPtr OpCode;
        public IntPtr BufferOffset;
        public IntPtr TransactionLength;

        public IntPtr Buffer;
    }

后来我将字节数组固定到结构并编组了它，所以我可以这样做：

TransactionData data = new TransactionData();

//declaring some arrays, allocating memory and pinning them to the struct
//also filling the non pointer fields with data

GCHandle handle1 = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr p = handle1.AddrOfPinnedObject();
DeviceIoControl(Handle, CtrlCode.Transact, IntPtr.Zero, 0, p, (uint)Marshal.SizeOf(typeof(TransactionData)), bytesreturned, IntPtr.Zero);

如何将枚举和结构移植到C＃？

0 个答案: