问题描述
我正在尝试创建一个实用的按键应用程序,以便我可以执行诸如终止预编程进程或启动某些操作之类的操作.我想我应该在任何应用程序中按住 cmd,然后输入一个 4 位数的命令键,这样我就可以在编程、调试观看视频等时快速启动或终止任何东西.
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.
我想出了如何获得键盘回调,但是无论出于何种原因,一旦我单击进入另一个应用程序,我的击键实用程序就不再接收任何键.即使我单击回到我的控制台窗口或 msvc,我也不会收到任何输入.这是除非它是全局的,那么我如何将钩子设置为全局?
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?
我的代码是
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);
}
推荐答案
为了让所有进程都可以访问您的键盘钩子,必须将它放在一个 DLL 中,然后该 DLL 将被加载到每个进程的地址空间中.要记住的一件重要事情是,由于 DLL 的每个实例都在单独的进程中加载,因此每个实例都将拥有自己的 DLL 中任何全局变量的副本.如果需要在这些实例之间共享数据,最简单的方法是在 DLL 中创建共享数据段.以下代码来自我编写的一个RSI监控程序.
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;
}
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