SendMessage(lnCallMeHWnd,WM_COPYDATA, 0,@m.lcText)

string sendString = 测试发送数据;
byte[] sarr = System.Text.Encoding.Default.GetBytes(sendString);
int len = sarr.Length;
COPYDATASTRUCT cds;
cds.dwData = (IntPtr)0 ;
cds.cbData = len + 1;
cds.lpData = sendString;
SendMessage(hWnd, WM_COPYDATA, 0, ref cds);


接收方：
if (m.Msg == WMA_InterPro)
{
COPYDATASTRUCT cds = new COPYDATASTRUCT();
Type t = cds.GetType();
cds = (COPYDATASTRUCT)m.GetLParam(t);
string receiveInfo=cds.lpData;
}

OK SYS(2600

VERY GOOD

//这段代码的功能就是枚举当前所有的顶层窗口句柄，并且指定了一个窗口句柄，如果枚举到的顶层窗口句柄和传递给EnumWindowsProc函数的窗口句柄不同，则使枚举到的顶层窗口失能//自定义结构体
typedef struct _DLONG
{
LONG wParam;
LONG lParam;
}stLONG;

//回调函数的定义
BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
stLONG *pDlong = (stLONG*)lParam;
BOOL bEnable = (BOOL)pDlong->lParam;
if (hwnd != (HWND)pDlong->wParam)
　　EnableWindow(hwnd, bEnable);//如果当前所枚举到的顶层窗口句柄和主调函数(EnumWindos函数)所传递来的额外信息做指定的顶层窗口句柄不同，则进行相关使能或使失能操作
return TRUE;
}

......

stLONG dlong;
//传递给EnumWindowsProc的额外信息
dlong.lParam = (LPARAM)FALSE;
dlong.wParam = (WPARAM)hWnd;
EnumWindows(EnumWindowsProc, (LONG)&dlong);


这种回调怎么写