UInt32到IntPtr

时间:2012-11-19 22:42:28

标签: c#

我有以下问题:

public class ListenThread : SocketInvoke
{
            [DllImport("Ws2_32", CharSet = CharSet.Auto)]
            public unsafe static extern UInt32 WSAWaitForMultipleEvents(UInt32 cEvents, IntPtr hEventObject,
            UInt32 fWaitAll, UInt32 dwTimeout, Boolean fAlertable);

            public void ListenConnections(NetSharedData data)
            {
                while (true)
                {
                    unsafe
                    {
                        if (WSAWaitForMultipleEvents((UInt32)1, data.signal, (UInt32)0, (UInt32)100, false) != WSA_WAIT_TIMEOUT)
                        {
                        }
                   }
             }
}

data.signal是一个UInt32如何将它转换为IntPtr?我试试:

IntPtr signal = (IntPtr)data.signal;

但它不起作用,因为我需要一个指向data.signal(UInt32)类型的指针而不是作为指针的int值,这会产生内存异常。

我需要的C ++示例:

int signal = 0;
int* psignal = &signal;

2 个答案:

答案 0 :(得分:2)

new IntPtr(data.signal);

您将在64位平台上遇到问题,因为data.signal仅挂在地址的低32位上。如果NetSharedData属于您,则应考虑将信号类型更改为IntPtr。

如果您正在尝试获取data.signal的地址:

new IntPtr(&data.signal);

我不确定这会正确固定对象(以防止内存管理器重新定位),我会做以下事情:

1)更改PInvoke签名:

public unsafe static extern UInt32 WSAWaitForMultipleEvents(UInt32 cEvents, 
       void* hEventObject, UInt32 fWaitAll, UInt32 dwTimeout, Boolean fAlertable);

2)使用fixed来固定对象

fixed (void* s = &data.signal)
{
    if (WSAWaitForMultipleEvents((UInt32)1, s, (UInt32)0, (UInt32)100, false) != WSA_WAIT_TIMEOUT)
    {
    }
}

答案 1 :(得分:1)

这也编译

        UInt32 unsignedInt = 6;
        IntPtr iptr = new IntPtr(unsignedInt);

所以也许这就是你想要的

IntPtr signal = new IntPtr(data.signal);