namespace TPNameSpace
{
public partial class TPMain : Form
{
double Heading = 0; //arr[2]
public delegate void CALLBACKFUNCFK(IntPtr pData, Int32 datalength);
public static CALLBACKFUNCFK callbackFK = new CALLBACKFUNCFK(CallBackFuncFK);
[DllImport("DataCtrlDll.dll", CharSet = CharSet.Auto, EntryPoint = "SetCallBack_YCFK")] // 设置设备的回调CallingConvention = CallingConvention.Cdecl,
public static extern int SetCallBack_YCFK(CALLBACKFUNCFK pCallBackFK);//FGetData pGetYC_FK
private void button1_OnMouseMove(object sender, EventArgs e)
{
label4.text="234";
int tempres = SetCallBack_YCFK(callbackFK);
}
public static void CallBackFuncFK(System.IntPtr pData, Int32 datalength)
{
int Heading=3;
label4.Text = Heading.ToString();// 此处提示出错，说找不到label4的定义 ，而且，此处的heading和正文中的heading完全两码事，怎么回事？
return;
}
}
