Question

我正在尝试从Xamarin中的Objective-C库绑定以下函数。

/*!
 *  This function writes data to the device.
 *
 *  @param writeBuffer Pointer to a byte buffer containing the write data.
 *  @param offset      Amount of data that was already written.
 *  @param size        Amount of data left to write.
 *
 *  @return Amount of data written.
 *
 *  @note Throws PortException on failure.
 */
- (u_int32_t)writePort:(u_int8_t const *)writeBuffer :(u_int32_t)offSet :(u_int32_t)size;

我无法确定writeBuffer的数据类型。

    [Export ("writePort:::")]
    Int32 WritePort (Byte[] writeBuffer, int offSet, int size);

我尝试过Byte []（如上所示）但是我收到以下错误：

/Projects/StarIOBinding/StarIOBinding/obj/Debug/ios/StarIO/SMPort.g.cs(34,34): Error CS1502: The best overloaded method match for `MonoTouch.Foundation.NSArray.FromNSObjects(params MonoTouch.Foundation.NSObject[])' has some invalid arguments (CS1502) (StarIOBinding)

然后我尝试了：

    [Export ("writePort:::")]
    Int32 WritePort (NSObject[] writeBuffer, int offSet, int size);

然后编译 - 但是在运行命令时，我没有得到预期的结果。我发送了一个包含在NSObject中的Byte []。 NSObject是正确的参数吗？我在哪里错了？

编辑：使用IntPtr时，我仍然没有输出。我可以确认我做得对吗？我的约束力：

    [Export ("writePort:::")]
    Int32 WritePort (IntPtr writeBuffer, int offSet, int size);

当我打电话时：

    IntPtr test = System.Runtime.InteropServices.Marshal.AllocHGlobal(myByteArray.Length);
    System.Runtime.InteropServices.Marshal.Copy(myByteArray, 0, test, myByteArray.Length);
    SMPort devPort = SMPort.GetPort ("TCP:10.0.1.4", "", 5);
    int count = devPort.WritePort (test, 0, myByteArray.Length);

Answer 1

您需要在绑定中使用IntPtr并使用Marshal类来回复制字节。

Xamarin绑定byte []或NSObject []

1 个答案: