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C++结构体定义: struct DeviceInfo { char szDeviceName[DEVICE_NAME_LEN]; char szMACAddress[MAC_ADDRESS_LEN]; char szDeviceIP[DEVICE_IP_LEN]; };
C#结构体的定义: [StructLayout(LayoutKind.Sequential)] public struct DeviceInfo { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)] public string szDeviceName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 13)] public string szMACAddress; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 17)] public string szDeviceIP; }
情况1:C++的dll负责分配内存C++导出函数的声明 #define DLL_API extern "C" __declspec(dllexport) DLL_API int findAllDevices(DeviceInfo** ppDeviceInfoList,int * pCount); C#导入函数的声明 [DllImport("IPAlter_d.dll")] public extern static int findAllDevices(out IntPtr pDeviceInfo, ref int pCount); C#的调用方法: IntPtr pBuff = new IntPtr();//直接new一个参数即可 if (IPAlter.findAllDevices(out pBuff, ref cout) != 1) { System.Console.WriteLine("搜索失败!"); System.Console.ReadLine(); return; } for (int i = 0; i < cout; i++) { IntPtr pPonitor = new IntPtr(pBuff.ToInt64() + Marshal.SizeOf(typeof(DeviceInfo)) * i); System.Console.WriteLine(((DeviceInfo)Marshal.PtrToStructure(pPonitor, typeof(DeviceInfo))).szDeviceName); System.Console.WriteLine(((DeviceInfo)Marshal.PtrToStructure(pPonitor, typeof(DeviceInfo))).szDeviceIP); System.Console.WriteLine(((DeviceInfo)Marshal.PtrToStructure(pPonitor, typeof(DeviceInfo))).szMACAddress); }
情况2:C#负责分配内存C++导出函数的声明: DLL_API int findAllDevice(DeviceInfo* ppDeviceInfoList,int * pCount);
C#导入函数的声明: [DllImport("IPAlter_d.dll")] public extern static int findAllDevice(IntPtr pDeviceInfo, ref int pCount);
C#的调用方法: DeviceInfo[] DeviceInfoList = new DeviceInfo[50]; int size = Marshal.SizeOf(typeof(DeviceInfo)) * 50; byte[] bytes = new byte[size]; IntPtr pBuff = Marshal.AllocHGlobal(size); if (IPAlter.findAllDevice(pBuff, ref cout) != 1) { System.Console.WriteLine("搜索失败!"); System.Console.ReadLine(); return; } for (int i = 0; i < cout; i++) { IntPtr pPonitor = new IntPtr(pBuff.ToInt64() + Marshal.SizeOf(typeof(DeviceInfo)) * i); DeviceInfoList[i] = (DeviceInfo)Marshal.PtrToStructure(pPonitor, typeof(DeviceInfo)); System.Console.WriteLine(DeviceInfoList[i].szDeviceName); System.Console.WriteLine(DeviceInfoList[i].szDeviceIP); System.Console.WriteLine(DeviceInfoList[i].szMACAddress); } Marshal.FreeHGlobal(pBuff);
可以参考: http://www.cnblogs.com/cxwx/archive/2010/12/29/1921140.html http://hi.baidu.com/fanr520/item/e761f9ca0766d462f6c95d55 http://blog.csdn.net/wangweitingaabbcc/article/details/7663949 |
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