Return 从 c++ 函数到 c# 的结构，然后是数组 UPDATE

Question

我在 2 周内阅读了大约 100 多篇关于此的帖子，并且让自己完全困惑。这是我在 BlueSoleil 堆栈上编写的包装器。

在 C++ 中

typedef char BTINT8;
typedef unsigned char BTUINT8;
typedef unsigned char BTUCHAR; /* extended ASII character, 0 - 255 */
typedef unsigned char BTBOOL;
typedef short BTINT16;
typedef unsigned short BTUINT16;
typedef long BTINT32;
typedef unsigned long BTUINT32;
typedef void * BTLPVOID;

typedef BTUINT32 BTDEVHDL;
typedef BTUINT32 BTSVCHDL;
typedef BTUINT32 BTCONNHDL;
typedef BTUINT32 BTSHCHDL;
typedef BTUINT32 BTSDKHANDLE;

typedef struct _BlueToothDevice
{
    BTDEVHDL rmt_device_handle;
    BTINT32  rmt_device_num;
    BTUINT32 rmt_device_class;
    BTUINT8  rmt_device_name[64];

} BLUETOOTHDEVICE;

typedef struct _BlueToothDevices
{
    BTUINT32 num_rmt_devices;
    BLUETOOTHDEVICE rmt_btd[100];
} BLUETOOTHDEVICES;

public ref class RemoteDeviceDiscovery
{       
public:
    int GetBTD(BLUETOOTHDEVICE btd);
};

在 C# 中

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct BluetoothDevice
    {
        [MarshalAs(UnmanagedType.SysUInt)]
        public UInt32 rmt_device_handle;
        [MarshalAs(UnmanagedType.SysInt)]
        public Int32 rmt_device_num;
        [MarshalAs(UnmanagedType.SysUInt)]
        public UInt32 rmt_device_class;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 248)]
        public IntPtr rmt_device_name;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct BluetoothDevices
    {
        [MarshalAs(UnmanagedType.SysUInt)]
        public UInt32 num_rmt_devices;
        [MarshalAs(UnmanagedType.ByValArray)]
        public List<BluetoothDevice> BluetoothDeviceInfo;
    }

static void Main()
{
    var rd = new RemoteDeviceDiscovery();

    BluetoothDevice bluetoothDevice = new BluetoothDevice();
    var i = rd.GetBTD(ref bluetoothDevice);
}

错误 3 参数 1：无法从 'ConsoleWrapperTest.Program.BluetoothDevice' 转换为 'BlueSoleilWrapper._BlueToothDevice'

所以请有人指出我哪里做错了。

吉姆

更新

使用以下头代码编译 c++/cli 包装器

public ref class RemoteDeviceDiscovery
{
    /* Remote Device Discovery */

public:

    int^ GetBTD(_BlueToothDevices % btds);
};

和 cpp 代码

array<Byte>^ MakeManagedArray(unsigned char* input, int len)
{
    array<Byte>^ result = gcnew array<Byte>(len);
    for (int i = 0; i < len; i++)
    {
        result[i] = input[i];
    }
    return result;
}

int^ RemoteDeviceDiscovery::GetBTD(_BlueToothDevices % btds)
{
    unsigned char name[] = "Test";

    _BlueToothDevice entry;

    btds.num_rmt_devices = 1;
    entry.rmt_device_class = 1;
    entry.rmt_device_handle = 2;
    entry.rmt_device_num = 3;
    entry.rmt_device_name = MakeManagedArray(name, sizeof(name));

    btds.rmt_btd[0] = gcnew _BlueToothDevice();
    btds.rmt_btd[0] = %entry;

    return 99;
}

问题现在出在 C# 代码中

var rd = new RemoteDeviceDiscovery();

_BlueToothDevices bluetoothDevices = new _BlueToothDevices();

var i = rd.GetBTD(bluetoothDevices);

var rmt_device_handle = bluetoothDevices.rmt_btd[0].rmt_device_handle;

编译时，我得到 'GetBTD' 不受语言支持，到目前为止我所看到的所有解决方案都没有奏效。感谢任何进一步的帮助。

吉姆

Answer 1

我建议查看定义 class RemoteDeviceDiscovery（Microsoft 中的 F12 Visual Studio）的程序集，看看是否可以找到该程序集对 BlueSoleilWrapper._BlueToothDevice 的定义.然后直接使用该定义。 ConsoleWrapperTest.Program.BluetoothDevice 永远不会映射到 BlueSoleilWrapper._BlueToothDevice，无论您的定义与程序集中的定义有多接近。

Answer 2

您好像在使用 C++\CLI，而不是普通的 C++。如果您直接使用 RemoteDeviceDiscovery，那么您必须实例化 BLUETOOTHDEVICE，而不是尝试创建您自己的结构。

如果您不能使用 BLUETOOTHDEVICE 因为它不公开可见，您可以为 RemoteDeviceDiscovery class 编写某种适配器，它将采用您的结构并将其映射到BLUETOOTHDEVICE.

Answer 3

好的，得到一个有效的答案！非常感谢 rpeshkov，你为我指明了正确的方向，我很高兴我从中学到了一些东西。

在header

public ref class RemoteDeviceDiscovery
{
    /* Remote Device Discovery */
public:
    int GetBTD(_BlueToothDevices ^% btds);
};

在cpp代码中

int RemoteDeviceDiscovery::GetBTD(_BlueToothDevices ^% btds)
{
    unsigned char name0[] = "Test0";
    unsigned char name1[] = "Test1";

    _BlueToothDevice^ entry = gcnew _BlueToothDevice();

    entry->rmt_device_class = 1;
    entry->rmt_device_handle = 2;
    entry->rmt_device_num = 3;
    entry->rmt_device_name = MakeManagedArray(name0, sizeof(name0));

    btds->num_rmt_devices = 2;
    btds->rmt_btd[0] = gcnew _BlueToothDevice();
    btds->rmt_btd[0] = entry;

    entry = gcnew _BlueToothDevice();

    entry->rmt_device_class = 4;
    entry->rmt_device_handle = 5;
    entry->rmt_device_num = 6;
    entry->rmt_device_name = MakeManagedArray(name1, sizeof(name1));

    btds->rmt_btd[1] = gcnew _BlueToothDevice();
    btds->rmt_btd[1] = entry;

    return 99;
}

最后是 C# 代码（这当然只是开发框架的基本测试）

var rd = new RemoteDeviceDiscovery();

_BlueToothDevices bluetoothDevices = new _BlueToothDevices();

var i = rd.GetBTD(ref bluetoothDevices);

var rmt_device_handle = bluetoothDevices.rmt_btd[0].rmt_device_handle;

Answer 4

替换.cpp代码

int RemoteDeviceDiscovery::GetBTD(_BlueToothDevices ^% btds)
{
    unsigned char name0[] = "Test0";
    unsigned char name1[] = "Test1";

    _BlueToothDevice^ entry = gcnew _BlueToothDevice();

    entry->rmt_device_class = 1;
    entry->rmt_device_handle = 2;
    entry->rmt_device_num = 3;
    entry->rmt_device_name = MakeManagedArray(name0, sizeof(name0));

    btds->num_rmt_devices = 2;
    btds->rmt_btd[0] = gcnew _BlueToothDevice();
    btds->rmt_btd[0] = entry;

    entry = gcnew _BlueToothDevice();

    entry->rmt_device_class = 4;
    entry->rmt_device_handle = 5;
    entry->rmt_device_num = 6;
    entry->rmt_device_name = MakeManagedArray(name1, sizeof(name1));

    btds->rmt_btd[1] = gcnew _BlueToothDevice();
    btds->rmt_btd[1] = entry;

    return 99;
}

Return 从 c++ 函数到 c# 的结构，然后是数组 UPDATE

Return a struct from a c++ function to c# then an array UPDATE

c#

c++-cli