using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace TestWechat
{
    public class ImportFromDLL
    {
        public const int WM_COPYDATA = 0x004A;
        public const int WM_KEYDOWN = 0x100;
        public const int WM_CLOSE = 0x0010;
        //启用非托管代码  
        [StructLayout(LayoutKind.Sequential)]
        public struct COPYDATASTRUCT
        {
            public int dwData;    //not used  
            public int cbData;    //长度  
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct STARTUPINFO
        {
            public int cb;
            public string lpReserved;
            public string lpDesktop;
            public int lpTitle;
            public int dwX;
            public int dwY;
            public int dwXSize;
            public int dwYSize;
            public int dwXCountChars;
            public int dwYCountChars;
            public int dwFillAttribute;
            public int dwFlags;
            public int wShowWindow;
            public int cbReserved2;
            public byte lpReserved2;
            public IntPtr hStdInput;
            public IntPtr hStdOutput;
            public IntPtr hStdError;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct PROCESS_INFORMATION
        {
            public IntPtr hProcess;
            public IntPtr hThread;
            public int dwProcessId;
            public int dwThreadId;
        }

        public enum AllocationType
        {
            Commit = 0x00001000,
            Reserve = 0x00002000,
            Decommit = 0x00004000,
            Release = 0x00008000,
            Reset = 0x80000,
            Physical = 0x400000,
            TopDown = 0x100000,
            WriteWatch = 0x200000,
            LargePages = 0x20000000
        }

        [Flags]
        public enum MemoryProtection
        {
            Execute = 0x10,
            ExecuteRead = 0x20,
            ExecuteReadWrite = 0x40,
            ExecuteWriteCopy = 0x80,
            NoAccess = 0x01,
            ReadOnly = 0x02,
            ReadWrite = 0x04,
            WriteCopy = 0x08,
            GuardModifierflag = 0x100,
            NoCacheModifierflag = 0x200,
            WriteCombineModifierflag = 0x400
        }

        // 在windows中查找窗口
        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        public static extern IntPtr FindWindow(String WindowClassName, String WindowTitle);

        // 激活窗口
        [DllImport("user32.dll")]
        public static extern int SetForegroundWindow(IntPtr hWnd);

        // 展示激活窗口
        [DllImport("user32.dll", ExactSpelling = true)]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);

        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("kernel32.dll")]
        public extern static IntPtr GetProcAddress(IntPtr hModule, string lpProcName);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, int dwSize, int lpNumberOfBytesWritten);

        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
        public static extern IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress, uint dwSize, AllocationType flAllocationType, MemoryProtection flProtect);

        [DllImport("kernel32.dll")]
        public static extern bool CreateProcess(string lpApplicationName, string lpCommandLine, IntPtr lpProcessAttributes, IntPtr lpThreadAttributes, bool bInheritHandles, uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory, ref STARTUPINFO lpStartupInfo, out PROCESS_INFORMATION lpProcessInformation);

        //关闭一个内核对象,释放对象占有的系统资源。其中包括文件、文件映射、进程、线程、安全和同步对象等
        [DllImport("kernel32.dll")]
        public extern static bool CloseHandle(IntPtr hObject);

        [DllImport("kernel32.dll")]
        public static extern IntPtr CreateRemoteThread(IntPtr hProcess, IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref COPYDATASTRUCT pcd);
    }
}