如何使跨进程一个键盘钩子全球

本文介绍了如何使跨进程一个键盘钩子全球的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想创建一个实用的按键程序，所以我可以做的事情一样杀了preprogrammed过程中或启动的东西。我想我应该持有任何应用CMD，然后输入一个4位数的命令键，以便我可以启动或迅速杀死任何东西，而编程，调试观看视频等。

我想出如何获得键盘的回调，但是由于各种原因，一旦我点击到另一个应用程序，我的击键UTIL没有收到更多的键。即使我点击回到我的控制台窗口或MSVC，我将不会收到任何输入。这是除非其全球，让我怎么设置挂钩，是全球性的？

我的code是

INT的main（）{    钩=调用SetWindowsHookEx（WH_KEYBOARD，KeyboardProc，的GetModuleHandle（0），0）;    味精味精;    而（的GetMessage（安培;味精，NULL，0，0）大于0）    {        的TranslateMessage（安培;味精）;        在DispatchMessage（安培;味精）;    }    UnhookWindowsHookEx（钩）;}

解决方案

为了您的键盘钩子可以从所有进程访问，它被放置在随后将被加载到每个进程的地址空间的DLL。要记住一个重要的事情是，由于该DLL的每个实例在一个单独的进程中加载​​，每次都会有自己的DLL中的任何全局变量的副本。如果您需要共享这些实例间的数据，最简单的方法是创建在DLL中的共享数据段。下面code是我写了一个RSI监测方案。

////一些数据会在所有共享//该DLL的实例//的#pragma评论（连接器，/SECTION:.SHARED,RWS）的#pragma data_seg（共享）INT iKeyCount = 0;HHOOK hKeyboardHook = 0;HHOOK hMouseHook = 0;的#pragma data_seg（）////特定实例数据//HMODULE的hInstance = 0;//// DLL加载/卸载入口点//BOOL APIENTRY的DllMain（HANDLE HMODULE，                      DWORD dwReason，                      LPVOID升preserved）{   开关（dwReason）   {   案例DLL_PROCESS_ATTACH：      实例句柄=（HINSTANCE）HMODULE;      打破;   案例DLL_THREAD_ATTACH：      打破;   案例DLL_THREAD_DETACH：      打破;   案例DLL_PROCESS_DETACH：      打破;   }   返回TRUE;}////键盘钩子//LRESULT CALLBACK KeyboardProc（INT code，//钩子code                              WPARAM wParam中，//虚拟键code                              LPARAM lParam的）//击键消息信息{   如果（（lParam的＆放大器;！为0x80000000）= 0）   {      ++ iKeyCount;   }   返回CallNextHookEx方法（hKeyboardHook，code，的wParam，lParam的）;}////鼠标钩子//LRESULT CALLBACK MouseProc（INT code，//钩子code                           WPARAM wParam中，//消息标识                           LPARAM lParam的）//鼠标坐标{   开关（wParam中）   {   案件WM_LBUTTONDOWN：   案例WM_MBUTTONDOWN：   案件WM_RBUTTONDOWN：   案例WM_LBUTTONDBLCLK：   案例WM_MBUTTONDBLCLK：   案例WM_RBUTTONDBLCLK：      ++ iKeyCount;      打破;   }   返回CallNextHookEx方法（hMouseHook，code，的wParam，lParam的）;}////安装键盘/鼠标挂钩//无效KBM_API InstallHooks（无效）{   hKeyboardHook =调用SetWindowsHookEx（WH_KEYBOARD，KeyboardProc，的hInstance，0）;   hMouseHook =调用SetWindowsHookEx（WH_MOUSE，MouseProc，的hInstance，0）;}////删除键盘/鼠标挂钩//无效KBM_API RemoveHooks（无效）{   UnhookWindowsHookEx（hKeyboardHook）;   UnhookWindowsHookEx（hMouseHook）;   hKeyboardHook = hMouseHook = 0;}////检索击键数//INT KBM_API FetchKeyCount（布尔bClear）{   INT KC = iKeyCount;   如果（bClear）      iKeyCount = 0;   返回KC;}

I am trying to create a utility keystroke app so i can do things like kill a preprogrammed process or launch something. I am thinking I should hold cmd in any app, then type in a 4 digit command key so I can launch or kill anything quickly while programming, debugging watching a video, etc.

I figured out how to get the keyboard callback, but for whatever reason once I click into another app, my keystroke util receives no more keys. Even if I click back to my console window or msvc, I will not receive any input. This is unless its global, so how do I set the hook to be global?

My code is

int main() { hook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, GetModuleHandle(0), 0); MSG msg; while(GetMessage(&msg, NULL, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessage(&msg); } UnhookWindowsHookEx(hook); }

解决方案

In order for your keyboard hook to be accessible from all processes, it has to be placed in a DLL which will then be loaded into each process' address space. One important thing to keep in mind is that since each instance of the DLL is loaded in a separate process, each will have its own copy of any global variables in the DLL. If you need to share data between these instances, the simplest way is to create a shared data segment in the DLL. The following code is from an RSI monitoring program I wrote.

// // some data will be shared across all // instances of the DLL // #pragma comment(linker, "/SECTION:.SHARED,RWS") #pragma data_seg(".SHARED") int iKeyCount = 0; HHOOK hKeyboardHook = 0; HHOOK hMouseHook = 0; #pragma data_seg() // // instance specific data // HMODULE hInstance = 0; // // DLL load/unload entry point // BOOL APIENTRY DllMain(HANDLE hModule, DWORD dwReason, LPVOID lpReserved) { switch (dwReason) { case DLL_PROCESS_ATTACH : hInstance = (HINSTANCE) hModule; break; case DLL_THREAD_ATTACH : break; case DLL_THREAD_DETACH : break; case DLL_PROCESS_DETACH : break; } return TRUE; } // // keyboard hook // LRESULT CALLBACK KeyboardProc(int code, // hook code WPARAM wParam, // virtual-key code LPARAM lParam) // keystroke-message information { if ((lParam & 0x80000000) != 0) { ++iKeyCount; } return CallNextHookEx(hKeyboardHook, code, wParam, lParam); } // // mouse hook // LRESULT CALLBACK MouseProc(int code, // hook code WPARAM wParam, // message identifier LPARAM lParam) // mouse coordinates { switch (wParam) { case WM_LBUTTONDOWN : case WM_MBUTTONDOWN : case WM_RBUTTONDOWN : case WM_LBUTTONDBLCLK : case WM_MBUTTONDBLCLK : case WM_RBUTTONDBLCLK : ++iKeyCount; break; } return CallNextHookEx(hMouseHook, code, wParam, lParam); } // // install keyboard/mouse hooks // void KBM_API InstallHooks(void) { hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, hInstance, 0); hMouseHook = SetWindowsHookEx(WH_MOUSE, MouseProc, hInstance, 0); } // // remove keyboard/mouse hooks // void KBM_API RemoveHooks(void) { UnhookWindowsHookEx(hKeyboardHook); UnhookWindowsHookEx(hMouseHook); hKeyboardHook = hMouseHook = 0; } // // retrieve number of keystrokes // int KBM_API FetchKeyCount(bool bClear) { int kc = iKeyCount; if (bClear) iKeyCount = 0; return kc; }