C#中发送消息给指定的窗口到消息循环
| public?class?Note ????{ ????????//聲明 API 函數(shù) ????????[DllImport("User32.dll", EntryPoint =?"SendMessage")] ????????private?static?extern?IntPtr SendMessage(int?hWnd,?int?msg, IntPtr wParam, IntPtr lParam); ??????????? ????????[DllImport("User32.dll", EntryPoint =?"FindWindow")] ????????private?static?extern?int?FindWindow(string?lpClassName,?string?lpWindowName); ????????? ?????????//定義消息常數(shù) ????????public?const?int?CUSTOM_MESSAGE = 0X400 + 2;//自定義消息 ? ????????? ???????//向窗體發(fā)送消息的函數(shù) ??????public?void?SendMsgToMainForm(int?MSG) ????????{ ????????????int?WINDOW_HANDLER = FindWindow(null,?"協(xié)同標(biāo)繪"); ????????????if?(WINDOW_HANDLER == 0) ????????????{ ????????????????throw?new?Exception("Could not find Main window!"); ????????????} ? ????????????long?result = SendMessage(WINDOW_HANDLER, CUSTOM_MESSAGE,?new?IntPtr(14), IntPtr.Zero).ToInt64(); ? ????????} ????} |
?在協(xié)同標(biāo)繪窗口里攔截消息的函數(shù)：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | protected?override?void?WndProc(ref?System.Windows.Forms.Message msg) { ????????????switch?(msg.Msg) ????????????{ ????????????????case?Note.CUSTOM_MESSAGE:?//處理消息 ????????????????????{ ????????????????????switch?(msg.WParam.ToString()) ????????????????????{ ????????????????????????case?"11"://對(duì)象添加 ????????????????????????????string?s =?"mdesheng"; ????????????????????????????addOne(s); ????????????????????????????break; ? ????????????????????????case?"12"://對(duì)象更新 ????????????????????????????string?sn =?"m"; ????????????????????????????updateID(sn); ????????????????????????????break; ? ?????????????????????????case?"13"://對(duì)象刪除 ????????????????????????????deleteID("5"); ????????????????????????????break; ? ?????????????????????????case?"14"://與會(huì)者信息更新 ????????????????????????????updateClientInfor("in_1_張三_在線"); ????????????????????????????break; ????????????????????} ? ????????????????????} ???????????????????????? ????????????????????????break; ????????????????default: ????????????????????base.WndProc(ref?msg);//調(diào)用基類函數(shù)處理非自定義消息。 ????????????????????break; ????????????} ????????????<br data-filtered="filtered">} ? private?void?button1_Click(object?sender, EventArgs e) { Note a =?new?Note(); a.SendMsgToMainForm(Note.CUSTOM_MESSAGE); } |
? ? FindWindow()函數(shù)的用法。要在C#里使用該API，寫出FindWindow()函數(shù)的聲明：
[DllImport("coredll.dll", EntryPoint = "FindWindow")]
private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
這個(gè)函數(shù)有兩個(gè)參數(shù)，第一個(gè)是要找的窗口的類，第二個(gè)是要找的窗口的標(biāo)題,是窗體的Text名字，不是name。在搜索的時(shí)候不一定兩者都知道，但至少要知道其中的一個(gè)。有的窗口的標(biāo)題是比較容易得到的，如"計(jì)算器"，所以搜索時(shí)應(yīng)使用標(biāo)題進(jìn)行搜索。但有的軟件的標(biāo)題不是固定的，如"記事本"，如果打開的文件不同，窗口標(biāo)題也不同，這時(shí)使用窗口類搜索就比較方便。如果找到了滿足條件的窗口，這個(gè)函數(shù)返回該窗口的句柄，否則返回0。?看例子
| 1 2 3 4 5 6 7 8 9 | IntPtr ParenthWnd =?new?IntPtr(0); ParenthWnd = FindWindow(null,"Word Mobile"); //判斷這個(gè)窗體是否有效 ?if?(ParenthWnd != IntPtr.Zero) { ????MessageBox.Show("找到窗口"); } else ????MessageBox.Show("沒有找到窗口"); |
從上面的討論中可以看出，如果要搜索的外部程序的窗口標(biāo)題比較容易得到，問題是比較簡(jiǎn)單的?？扇绻翱诘臉?biāo)題不固定或者根本就沒有標(biāo)題，怎么得到窗口的類呢？如果你安裝了Visual C++，你可以使用其中的Spy，在Spy++中有一個(gè)FindWindow工具，它允許你使用鼠標(biāo)選擇窗口，然后Spy++會(huì)顯示這個(gè)窗口的類。?
在Win32 API中還有一個(gè)FindWindowEx，它非常適合尋找子窗口。
在C#中向windows窗體發(fā)送消息示例
// define
[DllImport("User32.dll")]
??????? public static extern IntPtr FindWindow(String lpClassName, String lpWindowName);
??????? [DllImport("User32.dll")]
??????? static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
??????? [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
??????? static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
??????? const int WM_LBUTTONDOWN = 0x201;
??????? const int WM_LBUTTONUP = 0x0202;
??// sample, u should use spy++ to find windows class name and control?class name
??????? IntPtr hwndWin = FindWindow("TfrmMain", "window title");
??????????? if (hwndWin.Equals(IntPtr.Zero) == false)
??????????? {
??????????????? IntPtr hwndBtn = FindWindowEx(hwndWin, IntPtr.Zero, "TButton", "control text");
??????????????? if (hwndBtn.Equals(IntPtr.Zero) == false)
??????????????? {
??????????????????? SendMessage(hwndBtn, WM_LBUTTONDOWN, IntPtr.Zero, IntPtr.Zero);
??????????????????? SendMessage(hwndBtn, WM_LBUTTONUP, IntPtr.Zero, IntPtr.Zero);
??????????????? }
??????????? }
?
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