学步园

在需要用到SOFT1和SOFT2两个按键的时候， 也尝试了各种方案， 最后还是选个钩子函数， 但是在使用的过程中还是出现了一些问题的， 一些解决了一些还没有。下面有以下网上很多的实现。 且看这个

winceKBhook.h

#ifndef _WINCE_KB_HOOK_H<br /> #define _WINCE_KB_HOOK_H<br /> //used for passing to SetWindowsHookEx funtion to set a Low level (LL) keyboard hook<br /> #define WH_KEYBOARD_LL 20<br /> // Define the function types used by hooks<br /> typedef LRESULT (CALLBACK* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);<br /> typedef HHOOK (WINAPI *_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);<br /> typedef LRESULT (WINAPI *_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);<br /> typedef LRESULT (WINAPI *_UnhookWindowsHookEx)(HHOOK);<br /> // For the low level keyboard hook, your keyboards procedures is passed a pointer to KBDLLHOOKSTRUCT instance<br /> typedef struct {<br /> DWORD vkCode;<br /> DWORD scanCode;<br /> DWORD flags;<br /> DWORD time;<br /> ULONG_PTR dwExtraInfo;<br /> } KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;<br /> // Win32 Hook APIs<br /> static _SetWindowsHookExW SetWindowsHookEx;<br /> static _UnhookWindowsHookEx UnhookWindowsHookEx;<br /> static _CallNextHookEx CallNextHookEx;<br /> bool ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction);<br /> bool DeactivateKBHook();<br /> HRESULT DefHookProc(int, WPARAM, LPARAM);<br /> #endif<br />

winceKBhook.cpp

#include "stdafx.h"<br /> #include "winceKBhook.h"<br /> //globals<br /> HINSTANCE g_hHookApiDLL = NULL; //handle to coredll.dll, where all the hook related APIs are present<br /> HHOOK g_hInstalledLLKBDhook = NULL; //g_hInstalledLLKBDhook represents handle to the installed KB hook<br /> bool ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction)<br /> {<br /> //we need to manually load these standard Win32 API calls<br /> //MSDN states that these aren't supported in WinCE<br /> SetWindowsHookEx = NULL;<br /> CallNextHookEx = NULL;<br /> UnhookWindowsHookEx = NULL;<br /> //now load the coredll.dll<br /> g_hHookApiDLL = LoadLibrary(_T("coredll.dll"));<br /> if(g_hHookApiDLL == NULL)<br /> {<br /> //something is awfully wrong<br /> //the dll has to be present<br /> return false;<br /> }<br /> else<br /> {<br /> //load the SetWindowsHookEx API call<br /> //the SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.<br /> //You would install a hook procedure to monitor the system for certain types of events.<br /> //here we use use the hook to monitor kyeboard events<br /> SetWindowsHookEx = (_SetWindowsHookExW)GetProcAddress(g_hHookApiDLL, _T("SetWindowsHookExW"));<br /> if(SetWindowsHookEx == NULL)<br /> {<br /> //this means that MS has really stopped supporting this API in WinCE<br /> return false;<br /> }<br /> else<br /> {<br /> //install the KB hook<br /> //the hande needs to be saved for default processing of the events and to uninstall the hook, once we are done with it<br /> g_hInstalledLLKBDhook = SetWindowsHookEx(WH_KEYBOARD_LL, LLKeyboardHookCallbackFunction, hInstance, 0);<br /> if(g_hInstalledLLKBDhook == NULL)<br /> {<br /> return false;<br /> }<br /> }<br /> //load CallNextHookEx() API call<br /> //the CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.<br /> //we use this call for default processing of events.<br /> CallNextHookEx = (_CallNextHookEx)GetProcAddress(g_hHookApiDLL, _T("CallNextHookEx"));<br /> if(CallNextHookEx == NULL)<br /> {<br /> return false;<br /> }<br /> //load UnhookWindowsHookEx() API<br /> //the UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.<br /> //we use this call to unistall the hook.<br /> UnhookWindowsHookEx = (_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL, _T("UnhookWindowsHookEx"));<br /> if(UnhookWindowsHookEx == NULL)<br /> {<br /> return false;<br /> }<br /> }<br /> //all the APIs are loaded and the application is hooked<br /> return true;<br /> }<br /> bool DeactivateKBHook()<br /> {<br /> //unload the hook<br /> if(g_hInstalledLLKBDhook != NULL)<br /> {<br /> UnhookWindowsHookEx(g_hInstalledLLKBDhook);<br /> g_hInstalledLLKBDhook = NULL;<br /> }<br /> //unload the coredll.dll<br /> if(g_hHookApiDLL != NULL)<br /> {<br /> FreeLibrary(g_hHookApiDLL);<br /> g_hHookApiDLL = NULL;<br /> }</p> <p> //we have terminated gracefully<br /> return true;<br /> }<br /> HRESULT DefHookProc(int nCode, WPARAM wParam, LPARAM lParam)<br /> {<br /> return CallNextHookEx(g_hInstalledLLKBDhook, nCode, wParam, lParam);<br /> }

这个类似的实现网上一抄一大把。 我也搞了一个来实现， 还搞了一个DefHookProc函数， 因为懒得把CallNextHookEx时候要用的HHOOK公开了，所以一样的， hook filter里面就调用DefHookProc就好， 不需要调用CallNextHookEx了，一个参数我帮忙填写好了。

末了， 我尝试的实现了一下filter 函数：

int BlockKeyList[] = {VK_F1,VK_F2};<br /> #ifndef HC_ACTION<br /> #define HC_ACTION 0<br /> #endif //HC_ACTION<br /> LRESULT CALLBACK LLKeyboardHookCallbackFunction(int nCode, WPARAM wParam, LPARAM lParam)<br /> {<br /> KBDLLHOOKSTRUCT* pHook = (KBDLLHOOKSTRUCT*)lParam;<br /> if(nCode >= HC_ACTION)<br /> {<br /> if( wParam == WM_KEYDOWN && pHook->vkCode == VK_F1)<br /> {<br /> g_App.onKeyEvent(KEY_EVENT_KEY_PRESS, SL_KEY_SOFT1, lParam);<br /> return 1;<br /> }<br /> else if (wParam == WM_KEYUP && pHook->vkCode == VK_F1)<br /> {<br /> g_App.onKeyEvent(KEY_EVENT_KEY_RELEASE, SL_KEY_SOFT1, lParam);<br /> return 1;<br /> }<br /> else if (wParam == WM_KEYDOWN && pHook->vkCode == VK_F2)<br /> {<br /> g_App.onKeyEvent(KEY_EVENT_KEY_PRESS, SL_KEY_SOFT2, lParam);<br /> return 1;<br /> }<br /> else if (wParam == WM_KEYUP && pHook->vkCode == VK_F2)<br /> {<br /> g_App.onKeyEvent(KEY_EVENT_KEY_RELEASE, SL_KEY_SOFT2, lParam);<br /> return 1;<br /> }<br /> }<br /> return CallNextHookEx(g_hInstalledLLKBDhook, nCode, wParam, lParam);<br /> }

自
己看了应该没有什么问题， 但是实际上跑的是时候发现几次都crash了。 当然这些crash都和Messagebox有关系， 都是弹出Messagebox的时候就程序再没有响应了！！！ 糊涂了，难道是messagebox是不同的线程￥%￥……%， 想来想去还是至少有点， g_App.onKeyEvent如果里面弹出Messagebox这里岂不是阻塞了？？ 可能这样的函数是不允许你阻塞在这里的。 所以决定改了， 用PostMessage发个异步的消息看看。

if (code >= 0)<br /> {<br /> HWND hWnd;<br /> TCHAR szTitle[MAX_LOADSTRING]; // title bar text<br /> TCHAR szWindowClass[MAX_LOADSTRING]; // main window class name<br /> LoadString(g_hInst, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);<br /> LoadString(g_hInst, IDC_SCANLIFE, szWindowClass, MAX_LOADSTRING);<br /> //If it is already running, then focus on the window, and exit<br /> hWnd = FindWindow(szWindowClass, szTitle);<br /> if (hWnd)<br /> {<br /> if (pHook->vkCode == VK_F1 && wParam == WM_KEYDOWN)<br /> {<br /> PostMessage(hWnd, WM_KEYDOWN, VK_F1, 0);<br /> return true;<br /> }<br /> else if (pHook->vkCode == VK_F1 && wParam == WM_KEYUP)<br /> {<br /> PostMessage(hWnd, WM_KEYUP, VK_F1, 0);<br /> return true;<br /> }<br /> else if (pHook->vkCode == VK_F2 && wParam == WM_KEYDOWN)<br /> {<br /> PostMessage(hWnd, WM_KEYDOWN, VK_F2, 0);<br /> return true;<br /> }<br /> else if (pHook->vkCode == VK_F2 && wParam == WM_KEYUP)<br /> {<br /> PostMessage(hWnd, WM_KEYUP, VK_F2, 0);<br /> return true;<br /> }<br /> }<br /> }<br /> return DefHookProc(code, wParam, lParam);

果然一把通过了：） 当然就像开始就说的一样， 还是有问题没有解决， 在Smartphone上有的手机直接SetWindowsHookEx失败！ 这个除了程序签名估计没有什么办法。 anyway 继续探索吧。