C#查找指定窗口的子窗口的句柄.doc

C#查找指定窗口的子窗口的句柄 用axWebBrowser加载HTML网页时，真正显示内容的窗体并不是axWebBrowser，而是其子窗口的子窗口一个名为Internet Explorer_Server的类。从spy+可知： 公司需要在网页上进行手写，需要对Internet Explorer_Server进行操作，而通过axWebBrowser的Handle不能直接操作Internet Explorer_Server。于是在网上搜到Paul DiLascia写的一个CFindWnd类，是用C+写的，由于我用C#进行了改写。这个类主要用的的API 是EnumChildWindows和FindWindowEx，第一个遍历指定窗口下的子窗口，第二个查找指定名称的窗口，如果找到返回此窗口Handle。该类的用法：FindWindow fw = new FindWindow(wndHandle, ChildwndClassName); /实例化，第一个参数是要查找的起始窗口的句柄；第二个参数是要查找的窗口的类的名称。现在我们需要的传的是Internet Explorer_Server。IntPtr ip = fw.FoundHandle;/FindWindow的公共属性FoundHandle就是查找到的窗口的句柄。完整的类如下：usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.Runtime.InteropServices;namespaceSystemManager.Utility./*/Thisclassistofindthegivenwindowschildwindowaccrodingtothegivenchildwindowsname./Theuseage:FindWindowfw=newFindWindow(wndHandle,ChildwndClassName);IntPtrip=fw.FoundHandle;/IadaptthecodefromPaulDiLascia,whoistheMSDNMagazineswriter./TheoriginalclassisnamedCFindWndwhichiswritteninC+,andyoucouldgetitonInternet./isagreatwebsite.ItincludesalmostalltheAPIfuctointobeusedinC#./classFindWindow.DllImport(user32)return:MarshalAs(UnmanagedType.Bool)/IMPORTANT:LPARAMmustbeapointer(InterPtr)inVS2005,otherwiseanexceptionwillbethrownprivatestaticexternboolEnumChildWindows(IntPtrwindow,EnumWindowProccallback,IntPtri);/thecallbackfunctionfortheEnumChildWindowsprivatedelegateboolEnumWindowProc(IntPtrhWnd,IntPtrparameter);/iffoundreturnthehandle,otherwisereturnIntPtr.ZeroDllImport(user32.dll,EntryPoint=FindWindowEx)privatestaticexternIntPtrFindWindowEx(IntPtrhwndParent,IntPtrhwndChildAfter,stringlpszClass,stringlpszWindow);privatestringm_classname;/classnametolookforprivateIntPtrm_hWnd;/HWNDiffoundpublicIntPtrFoundHandle.get.returnm_hWnd;/ctordoesthework-justinstantiateandgopublicFindWindow(IntPtrhwndParent,stringclassname).m_hWnd=IntPtr.Zero;m_classname=classname;FindChildClassHwnd(hwndParent,IntPtr.Zero);/*/Findthechildwindow,iffoundm_classnamewillbeassigned/parentshandle/theapplicationvalue,nonuse/foundornotfound/TheC+codeisthatlParamistheinstanceofFindWindowclass,iffoundassigntheinstancesm_hWndprivateboolFindChildClassHwnd(IntPtrhwndParent,IntPtrlParam).EnumWindowProcchildProc=newEnumWindowProc(FindChildClassHwnd);IntPtrhwnd=FindWindowEx(hwndParent,IntPtr.Zero,this.m_classname,string.Empty);if(hwnd!=IntPtr.Zero).this.m_hWnd=hwnd;/found:saveitreturnfalse;/stopenumeratingEnumChildWindows(hwndParent,childProc,IntPtr.Zero);/recurseredoFindChildClassHwndreturntrue;/keeplooking注意：在VS2005中，MDA检查的很严格，LPARAM是64位，要用IntPtr表示(网上有人用long来表示，我试了，MDA会抛出异常)。是个不错的网站，它包含了几乎所有的API在.NET中的调用说明，还有例子。附Paul DiLascia用C+写的CFindWnd类：/*/MSDNMagazine-August2003/Ifthiscodeworks,itwaswrittenbyPaulDiLascia./Ifnot,Idontknowwhowroteit./CompileswithVisualStudio.NETonWindowsXP.Tabsize=3./-/Thisclassencapsulatestheprocessoffindingawindowwithagivenclassname/asadescendantofagivenwindow.Touseit,instantiatelikeso:/CFindWndfw(hwndParent,classname);/fw.m_hWndwillbetheHWNDofthedesiredwindow,iffound./classCFindWnd.private:/*/ThisprivatefunctionisusedwithEnumChildWindowstofindthechild/withagivenclassname.ReturnsFALSEiffound(tostopenumerating)./staticBOOLCALLBACKFindChildClassHwnd(HWNDhwndParent,LPARAMlParam).CFindWnd*pfw=(CFindWnd*)lParam;HWNDhwnd=FindWindowEx(hwndParent,NULL,pfw-m_classname,NULL);if(hwnd).pfw-m_hWnd=hwnd;/found:saveitreturnFALSE;/stopenumeratingEnumChildWindows(hwndParent,FindChildClassHwnd,lParam);/recursereturnTRUE;/keeplookingpublic:LPCSTRm_classname;/classnametolookforHWNDm_hWnd;/HWNDiffound/ctordoesthework-justinstantiateandgoCFindWnd(HWNDhwndParent,LPCSTRclassname):m_hWnd(NULL),m_classname(classname).FindChildClassHwnd(hwndParent,(LPARAM)this);2009年更新通过实验得知，FindWindowEx可以通过classname或caption（也就是窗口的title）查找窗口，且如果第一个参数传IntPtr.Zero的话，将从Windows最顶层窗口开始查找，但是窗口很多的话这样会非常的慢，所以加入Timeout的判断，如果超时还没找到，返回false。用法：FindWindow fw = new FindWindow(IntPtr.Zero, null, ThunderDFrame, 10);/查找Title为ThunderDFrame的窗口，如果10秒内还没找到，返回false代码如下：using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;namespace Util class FindWindow DllImport(user32) return: MarshalAs(UnmanagedType.Bool) /IMPORTANT : LPARAM must be a pointer (InterPtr) in VS2005, otherwise an exception will be thrown private static extern bool EnumChildWindows(IntPtr window, EnumWindowProc callback, IntPtr i); /the callback function for the EnumChildWindows private delegate bool EnumWindowProc(IntPtr hWnd, IntPtr parameter); /if found return the handle , otherwise return IntPtr.Zero DllImport(user32.dll, EntryPoint = FindWindowEx) private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); private string m_classname; / class name to look for private string m_caption; / caption name to look for private DateTime start; private int m_timeout;/If exceed the time. Indicate no windows found. private IntPtr m_hWnd; / HWND if found public IntPtr FoundHandle get return m_hWnd; private bool m_IsTimeOut; public bool IsTimeOut getreturn m_IsTimeOut; set m_IsTimeOut = value; / ctor does the work-just instantiate and go public FindWindow(IntPtr hwndParent, string classname, string caption, int timeout) m_hWnd = IntPtr.Zero; m_classname = classname; m_caption = caption; m_timeout = timeout; start = DateTime.Now; FindChildClassHwnd(hwndParent, IntPtr.Zero); /*/ / / Find the child window, if found m_classname will be assigned / / parents handle / the application value, nonuse / found or not found /The C+ code is that lParam