Question

C ++代码是：

DLL_API DWORD WINAPI ExecuteCommand( LPCSTR, CONST COMMAND, CONST DWORD, LPREPLY);

typedef struct
{
    REPLY_TYPE      replyType;

    union
    {
        POSITIVE_REPLY  positiveReply;
        NEGATIVE_REPLY  negativeReply;
    }
    message;

}
REPLY;

我的C＃代码是：

public struct Reply
{
    public ReplyType ReplyType;

    public PositiveReply PositiveReply;
    public NegativeReply NegativeReply;
}

[DllImport(@"my.dll")]
public static extern int ExecuteCommand(string port, Command command, int timeout, ref Reply reply);

如何正确地将联合转移到C＃代码？当我调用ExecuteCommand时，我会收到应该包含正面或负面回复的回复（例如C ++方法）。

Answer 1

您无法在C＃中复制C union。你应该这样做（根据你的真实代码更改类型名称和常量）：

public struct Reply { public int rt; public object o; public int? pr { get { return rt == 1 ? (int?)o : null; } } public int? nr { get { return rt == 0 ? (int?)o : null; } } }

如何使用包含union

1 个答案: