封送结构体数组指针

Question

继续顶。稍微讲解下思路也行

Answer 1

            tagSubscribeTrafficFlowInfo pGetInfo = new tagSubscribeTrafficFlowInfo();
            pGetInfo.nChnlCount =3;
            pGetInfo.nInterval =60;
            // 源目标参数  
            tagEncChannelInfo[] infos = new tagEncChannelInfo[3];  
            for (int i = 0; i < infos.Length; i++)  
            {  
                infos[i] = new tagEncChannelInfo();  
            }            IntPtr[] intPtrArr = new IntPtr[infos.Length];
            for (int i = 0; i < 3; i++)
            {
                infos[0].szId = "1000000$1$0$0";
                infos[0].szName = "tesssssssss";
                infos[0].nCameraType = (CAMERA_TYPE)0;
                intPtrArr[0] = Marshal.AllocHGlobal(Marshal.SizeOf(infos[0]));
                Marshal.StructureToPtr(infos[0], intPtrArr[0], false);                infos[1].szId = "1000001$1$0$0";
                infos[1].szName = "tesssssssss";
                infos[1].nCameraType = (CAMERA_TYPE)0;
                intPtrArr[1] = Marshal.AllocHGlobal(Marshal.SizeOf(infos[1]));
                Marshal.StructureToPtr(infos[1], intPtrArr[1], false);                infos[2].szId = "1000012$1$0$0";
                infos[2].szName = "tesssssssss";
                infos[2].nCameraType = (CAMERA_TYPE)0;
                intPtrArr[2] = Marshal.AllocHGlobal(Marshal.SizeOf(infos[2]));
                Marshal.StructureToPtr(infos[2], intPtrArr[2], false);
            }
            IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(tagEncChannelInfo)));
            Marshal.Copy(intPtrArr, 0, ptr, 3);
            pGetInfo.pEncChannelnfo = ptr;
            pGetInfo.nSubscribeFlag = 1;
            int iRet =DHSdk.DPSDK_SubscribeTrafficFlow(m_nDLLHandle, ref pGetInfo,10000);
            if (iRet == 0)
            {
                MessageBox.Show("订阅成功!");
            }
            else { MessageBox.Show("订阅失败!"); }
            for (int i = 0; i < 3; i++)
            {
                Marshal.FreeHGlobal(intPtrArr[i]);
            }
            Marshal.FreeHGlobal(ptr)
自己捣鼓了下 这样写可以吗？