c++与C# winform的消息通讯--（结构体与byte数组的使用）

BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call,LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
} struct DevInfo//定义一个我自己的数据结构体
{
INT32 id;
char name[];
char mac[];
BYTE data[];
}; extern "C" __declspec(dllexport) int sendTest(INT32 msg)//测试用的发布函数，这个int32参数一点作用都没有
{
DevInfo *pinfo=new DevInfo();
pinfo->id=;
sprintf(pinfo->name,"myDevice");
sprintf(pinfo->mac,"19:4x:3a:4a"); for (int i = ; i < ; i++)
{
pinfo->data[i]=(BYTE)(0x40+i);
} COPYDATASTRUCT cpd; /*给COPYDATASTRUCT结构赋值,COPYDATASTRUCT,这个也是系统自己定义的*/
cpd.dwData = ; //定义一个标示符（我这里没有用到）
cpd.cbData = sizeof(DevInfo);
cpd.lpData = pinfo; //将指针的地址通过消息发送 HWND handle2=::FindWindowA(NULL,(LPCSTR)"Form1");//获取窗口的句柄 ::SendMessageA(handle2,WM_COPYDATA,(WPARAM),(LPARAM)&cpd); //这个地方必须要用sendMessageA，如果用post的话，则可能会出现数据还没有发送完
//系统就把定义的DevInfo 给清理掉了 std::cout<<"发送数据消息"<<WM_COPYDATA<<std::endl;
delete pinfo; return ;
}

namespace Test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private const int WM_COPYDATA = 0x004A;//自己定义一个消息是必须的了 [DllImport("BlueTooth4.dll", EntryPoint = "sendTest", CallingConvention = CallingConvention.Cdecl)]
public static extern Int32 sendTest(int msg);//我们刚才执行的事件，这个是为了测试用才这样做的 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct COPYDATASTRUCT//定义数据传输的结构
{
public IntPtr dwData;
public int cbData;
public IntPtr lpData;
} //定义要传递的Struct
[StructLayout(LayoutKind.Sequential)]//如果发现处理的数据有乱码的话，则在此处加上 ，CharSet = CharSet.Ansi
struct dataInfo
{
public IntPtr id; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = )]
public string name; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = )]
public string mac; [MarshalAs(UnmanagedType.ByValArray, SizeConst = )]
public byte[] data;
} protected override void DefWndProc(ref Message m)//开始处理消息
{
switch (m.Msg)
{
//接收CopyData消息，读取发送过来的数据
case WM_COPYDATA:
COPYDATASTRUCT copydata = new COPYDATASTRUCT();
COPYDATASTRUCT RecvData = (COPYDATASTRUCT)m.GetLParam(typeof(COPYDATASTRUCT));
dataInfo h = (dataInfo)Marshal.PtrToStructure((IntPtr)RecvData.lpData, typeof(dataInfo));//这句和上面的一句就已经将数据进行转换了
break;
default:
base.DefWndProc(ref m);
break;
} }
}
}