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   源码介绍

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qq2015不能用的，可以参考其思路

using System;
using System.Threading;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace QQMsg
{

    public partial class FormMain : Form
    {
        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll")]
        private static extern int GetWindowText(IntPtr hwnd, StringBuilder lpString, int cch);

        [DllImport("user32.dll", EntryPoint = "SetWindowPos", SetLastError = true)]
        private static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);



        private string className, windowText;
        private IntPtr qqWindowHwnd;
        private int memberCount = 0;

        public FormMain()
        {
            InitializeComponent();
        }

        public bool IsTargetShow
        {
            get
            {
                qqWindowHwnd = FindWindow(className, windowText);
                if (qqWindowHwnd != IntPtr.Zero) //找到目标窗口
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /// <summary>
        /// 设置鼠标位置
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        static extern bool SetCursorPos(int x, int y);

        [DllImport("user32.dll")]
        static extern bool mouse_event(int dwFlags, int dx, int dy, int dwData, UInt64 dwExtraInfo);

        [DllImport("user32.dll", EntryPoint = "keybd_event")]
        public static extern void keybd_event(byte bVk, //虚拟键值     
            byte bScan,// 一般为0      
            int dwFlags, //这里是整数类型 0 为按下，2为释放      
            int dwExtraInfo //这里是整数类型 一般情况下设成为0      
            );

        public void SendDoubleClick(int x, int y)
        {
            SetCursorPos(x, y);
            mouse_event(0x2, 0, 0, 0, 0);
            mouse_event(0x4, 0, 0, 0, 0);
            Thread.Sleep(50);
            mouse_event(0x2, 0, 0, 0, 0);
            mouse_event(0x4, 0, 0, 0, 0);
        }

        public void SendClick(int x, int y)
        {
            SetCursorPos(x, y);
            mouse_event(0x2, 0, 0, 0, 0);
            mouse_event(0x4, 0, 0, 0, 0);
        }

        public void SendPaste()
        {
            keybd_event(17, 0, 0, 0);
            keybd_event(86, 0, 0, 0);
            keybd_event(86, 0, 2, 0);
            keybd_event(17, 0, 2, 0);
        }

        public void SendEnter()
        {
            keybd_event(13, 0, 0, 0);
          
            keybd_event(13, 0, 2, 0);
        }

        public void SendDown()
        {
            keybd_event(40, 0, 0, 0);
            keybd_event(40, 0, 2, 0);
            Thread.Sleep(50);
        }

        public void SendCtrlEnter()
        {
            keybd_event(17, 0, 0, 0);
            keybd_event(13, 0, 0, 0);
            keybd_event(13, 0, 2, 0);
            keybd_event(17, 0, 2, 0);
        }

        public void SendAltF4()
        {
            keybd_event(18, 0, 0, 0);
            keybd_event(115, 0, 0, 0);
            keybd_event(115, 0, 2, 0);
            keybd_event(18, 0, 2, 0);
        }


        private void FormMain_Load(object sender, EventArgs e)
        {
            this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width;
            this.Top = 0;
        }

        private void BtnResetWindow_Click(object sender, EventArgs e)
        {
            className = TxtClassName.Text;
            windowText = TxtWindowText.Text;
            memberCount = Convert.ToInt32(TxtMemberCount.Text);
            Clipboard.SetText(TxtMessage.Text);

            if (!IsTargetShow)
            {
                MessageBox.Show("没有找到指定的QQ群窗口。");
                return;
            }
            SetWindowPos(qqWindowHwnd, 0, 0, 0, 620, 520, 0);

            SendClick(450, 131   10); //点选群成员，使其获得输入焦点

            SendEnter();

            SendClick(140, 440); //点选输入框，使其获得输入焦点
            SendPaste();
    

            //SendCtrlEnter();//点击发送按钮
            Thread.Sleep(200);

            //SendAltF4();//关闭私聊窗口窗口
            Thread.Sleep(50);

        }


        private void BtnBeginSend_Click(object sender, EventArgs e)
        {
            MessageBox.Show("按键盘回车键后开始群发，请将手从鼠标移开。");
            Thread.Sleep(1000);

            className = TxtClassName.Text;
            windowText = TxtWindowText.Text;
            Clipboard.SetText(TxtMessage.Text);

            if (!IsTargetShow)
            {
                MessageBox.Show("没有找到指定的QQ群窗口。");
                return;
            }
           

            int posY = 119;
            int panelCount = 17;
            if (panelCount > memberCount) panelCount = memberCount;
            for (int n = 0; n < panelCount; n  )
            {
                
                posY = posY   22;
                SetWindowPos(qqWindowHwnd, 0, 0, 0, 620, 520, 0);

                SendClick(450, posY   10); //点选群成员，使其获得输入焦点

                SendEnter();
               

                SendClick(140, 440); //点选输入框，使其获得输入焦点
                Thread.Sleep(50);
                SendPaste();
                Thread.Sleep(1500);

                SendCtrlEnter();//点击发送按钮
                Thread.Sleep(1500);

                SendAltF4();//关闭私聊窗口窗口
                Thread.Sleep(500);
            }

            if(panelCount == memberCount) return;
            int lastCount = memberCount - panelCount;

            for (int n = 0; n < lastCount; n  )
            {
                SetWindowPos(qqWindowHwnd, 0, 0, 0, 620, 520, 0);

                SendClick(450, posY   10); //点选群成员，使其获得输入焦点
                SendDown();

                SendEnter();


                SendClick(140, 440); //点选输入框，使其获得输入焦点
                Thread.Sleep(50);
                SendPaste();
                Thread.Sleep(1500);

                SendCtrlEnter();//点击发送按钮
                Thread.Sleep(1500);

                SendAltF4();//关闭私聊窗口窗口
                Thread.Sleep(500);
            }

            MessageBox.Show("群发完成。");
        }
    }
}