以下是msdn中的例子！
[C#]
using System;
using System.Runtime.InteropServices;
public delegate bool CallBack(int hwnd, int lParam);
public class EnumReportApp {
[DllImport("user32")]
public static extern int EnumWindows(CallBack x, int y);
public static void Main()
{
CallBack myCallBack = new CallBack(EnumReportApp.Report);
EnumWindows(myCallBack, 0);
}
public static bool Report(int hwnd, int lParam) {
Console.Write("Window handle is ");
Console.WriteLine(hwnd);
return true;
}
}
我在自己的程序中是这样调用的
//定义委托
public unsafe delegate void CallBack(int hwnd, void* Param);
//引入Dll中的函数！
[DllImport("JPSystemApi.dll",EntryPoint="JPRegisterStreamReadCallback")]
public unsafe static extern int JPRegisterStreamReadCallback(CallBack pCallBack,void* Context);
//实例化委托
CallBack F_myCallBack = new CallBack(JPRegister_StreamRead_Callback);
//注册委托
int i = JPSystem._JPRegisterStreamReadCallback(F_myCallBack,n);
GC.KeepAlive(F_myCallBack);//不回收
public unsafe static void JPRegister_StreamRead_Callback(int channel_number,void* point)
{
//this.richTextBox1.AppendText("start"+"\n");
MessageBox.Show("显卡不支持！","Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
完全按照msdn中的过程来得！可是回调函数还是没有运行！不知道是什么原因？大家能给我个答复吗？