static class Program
    {
        private int baseAddress = 0x006A9EC0;           //游戏内存基址
        private string processName = "PlantsVsZombies"; //游戏进程名字
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            int address = ReadMemoryValue(baseAddress);//本来这里实际返加的不是0，但次次运行都返回为0，不知道哪里错了，请大家多看看
            Console.WriteLine(address.ToString());
            Console.ReadLine();   
        }

       //根据进程名获取PID
        public static int GetPidByProcessName(string processName)
        {
            Process[] arrayProcess = Process.GetProcessesByName(processName);

            foreach (Process p in arrayProcess)
            {
                return p.Id;
            }
            return 0;
        }
      
      //读内存值
       public static int ReadMemoryValue(int baseAddress,string processName)
        {
            try
            {
                byte[] buffer = new byte[4];
                IntPtr byteAddress = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0); //获取缓冲区地址
                IntPtr hProcess = OpenProcess(0x1F0FFF, false, GetPidByProcessName(processName));
                ReadProcessMemory(hProcess, (IntPtr)baseAddress, byteAddress, 4, IntPtr.Zero); //将制定内存中的值读入缓冲区            
                CloseHandle(hProcess);
                return Marshal.ReadInt32(byteAddress);               
            }
            catch
            {
                return 0;
            }
        }
    }

这么多人看了，都没一个能回答啊，高手们在哪里啊？出来冒个泡啊

不知为啥缓冲区的值一直为零，肯定是该地址的值没有写入缓冲区，不知为啥未写入呢？

强调一下，两个return 0；都没发生,所以没有异常发生。