利用API发送和接收消息代码,CSharp代码库,德仔网

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【CSharp】利用API发送和接收消息
作者:lybwwp / 发布于2014/1/26/ 246
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace Set_Get_Messages
{
 class APISendMsg
 {
 #region 常数
 const int WM_COPYDATA = 0x004A;//发送消息到窗口
 const int WM_SETTEXT = 0xC;//发送消息到控件
 const int WM_CLOSE = 0x0010;//关闭窗口
 const int BM_CLICK = 0xF5;//点击窗体
 public const int WM_GETTEXT = 0x000D;//得到消息
 #endregion
 #region API函数
 //查找窗体
 [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
 public static extern IntPtr FindWindow(String classname, String text);
 //查找子窗体
 [DllImport("User32.dll", EntryPoint = "FindWindowEx", CharSet = CharSet.Auto)]
 public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpClassName, string lpWindowName);

 /// <summary>
 /// 将指定的消息发送到一个或多个窗口
 /// </summary>
 /// <param name="hwnd">目标窗口句柄</param>
 /// <param name="msg">消息类型</param>
 /// <param name="hwndFrom">返回的消息</param>
 /// <param name="cd">发送的消息</param>
 /// <returns></returns>
 [DllImport("user32.dll", EntryPoint = "SendMessage")]
 public static extern long SendMessage(IntPtr hwnd, Int32 msg, Int32 hwndFrom, ref COPYDATASTRUCT cd);
 [DllImport("user32.dll", EntryPoint = "SendMessage")]
 public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
 /// <summary>
 /// 将指定的消息发送到一个或多个窗体
 /// </summary>
 /// <param name="hWnd">窗体句柄</param>
 /// <param name="Msg">消息类别</param>
 /// <param name="wParam">返回消息</param>
 /// <param name="lParam">发送的消息</param>
 /// <returns></returns>
 [DllImport("user32.dll", EntryPoint = "SendMessage")]
 public static extern long SendMessage(IntPtr hWnd, Int32 Msg, Int32 wParam, [MarshalAs(UnmanagedType.LPStr)] string lParam);

 //获取消息
 [DllImport("user32.dll", EntryPoint = "SendMessage")]
 public static extern bool SendMessageSetText(IntPtr hwnd, uint wMsg, uint wParam, string lParam);
 [DllImport("user32.dll", EntryPoint = "SendMessage")]
 public static extern int SendMessageGetText(IntPtr hwnd, uint wMsg, uint wParam, StringBuilder lParam);


 #endregion
 #region 发送消息
 //发送消息结构体
 [StructLayout(LayoutKind.Sequential)]
 public struct COPYDATASTRUCT
 {
 public IntPtr dwData;//目标
 public int cbData;//数据长度
 [MarshalAs(UnmanagedType.LPStr)]
 public string lpData;//消息
 }

 /// <summary>
 /// 发送消息
 /// </summary>
 /// <param name="strMsg">消息</param>
 /// <returns>成功非0，失败0</returns>
 public static long API_sendMsgWindows(IntPtr windowHwnd, string strMsg)
 {
 long longResult = 0;
 if (windowHwnd != IntPtr.Zero && !string.IsNullOrEmpty(strMsg.Replace(" ", "")))
 {
 //定义c,是为了取得字符串中一些非英文字符的长度，比如一个中文，占两个字长。
 int longMsg = StrLength(strMsg);
 Int32 id = 1;
 COPYDATASTRUCT cd = new COPYDATASTRUCT();
 cd.dwData = (IntPtr)id;
 cd.lpData = strMsg + "/$";//一定要加上结束标志，不加的话会得到不确定的字符。
 cd.cbData = strMsg.Length + longMsg + 2;//另外加上双字节的东西和结束符的长度
 //发送消息
 longResult = SendMessage(windowHwnd, WM_COPYDATA, 0, ref cd);
 }
 return longResult;
 }

 /// <summary>
 /// 字符串长度(按字节算)
 /// </summary>
 /// <param name="str"></param>
 /// <returns>字符串长度</returns>
 private static int StrLength(string str)
 {
 int len = 0;
 byte[] b;
 if (!string.IsNullOrEmpty (str.Replace(" ","")))
 {
 for (int i = 0; i < str.Length; i++)
 {
 b = Encoding.Default.GetBytes(str.Substring(i, 1));//每个字
 if (b.Length > 1)
 len += 2;
 else
 len++;
 }
 }

 return len;
 }
 #endregion
 #region 得到窗体消息
 /// <summary>
 /// 取得指定句柄的窗口的Caption字符串
 /// </summary>
 /// <param name="hWnd"></param>
 /// <param name="strWndText"></param>
 /// <returns></returns>
 public static int GetWindowControlTextX(IntPtr hWnd, out string strWndText)
 {
 /*
 StringBuffer sLimitedString;
 int nLen = GetWindowText(hWnd, out sLimitedString, 256);
 if (nLen > 0)
 strWndText = sLimitedString.szText;
 else
 strWndText = @"";

 return nLen;
 */
 //由于针对不同的进程的窗体控件，不能使用GetWindowText函数，只能使用WM_GETTEXT
 StringBuilder strBuffer = new StringBuilder(1024);
 int nLen = SendMessageGetText(hWnd,WM_GETTEXT, 1024, strBuffer);
 strWndText = strBuffer.ToString();
 return nLen;
 }
 #endregion
 #region 共用方法
 /// <summary>
 /// 为控件赋值
 /// </summary>
 /// <param name="childControID">控件句柄</param>
 /// <param name="strMsg">消息</param>
 /// <returns>成功非0，失败0</returns>
 public static long API_SetTextValue(IntPtr childControID, string strMsg)
 {
 long longResult = 0;
 if (childControID != IntPtr.Zero && !string.IsNullOrEmpty(strMsg.Replace(" ", "")))
 {
 longResult = SendMessage(childControID, WM_SETTEXT, 0, strMsg);
 }
 return longResult;
 }
 /// <summary>
 /// 点击控件
 /// </summary>
 /// <param name="childControID">按钮控件句柄</param>
 /// <returns>成功非0，失败0</returns>
 public static long API_ClickButton(IntPtr childControID)
 {
 long longResult = 0;
 if (childControID != IntPtr.Zero)
 {
 longResult = SendMessage(childControID, BM_CLICK, 0, 0);
 }
 return longResult;
 }

 #endregion
 }
}

//补

//另一种比较稳定的方法接收窗体中的代码

 //自动接收消息
 [StructLayout(LayoutKind.Sequential)]
 public struct COPYDATASTRUCT
 {
 public IntPtr dwData;
 public int cbData;
 public IntPtr lpData;
 }

 protected override void DefWndProc(ref Message m)
 {
 try
 {
 switch (m.Msg)
 {
 //接收CopyData消息，读取发送过来的数据
 case WM_COPYDATA:
 COPYDATASTRUCT cds = new COPYDATASTRUCT();
 Type mytype = cds.GetType();
 cds = (COPYDATASTRUCT)m.GetLParam(mytype);
 uint flag = (uint)(cds.dwData);
 byte[] bt = new byte[cds.cbData];
 Marshal.Copy(cds.lpData, bt, 0, bt.Length);
 if (cds.cbData > 0)
 {
 string tmp = System.Text.Encoding.Default.GetString(bt);
 if (!string.IsNullOrEmpty(tmp))
 {
 //交易方法
 getRunPlan(tmp);
 }
 }
 // MessageBox.Show(tmp);
 break;
 default:
 base.DefWndProc(ref m);
 break;
 }
 }
 catch (Exception ex)
 {
 XtraMessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
 // throw ex;
 }
 }
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