使用C ++禁用任务切换键 [英] Disable task switching keys with c++
问题描述
我已经进行了很多搜索，没有找到真正的解决方案(针对我自己的问题)，所以我想在这里问.
我正在设计一个类似信息亭的程序，该程序可以防止用户在程序运行时使用任务键(alt + tab，alt + esc，ctrl + esc等).注意我是一个新手程序员，因此，如果可以的话，我想避免使用单独的dll处理程序.特别是，我去了这个网站 http://support.microsoft.com/kb/226359/en-us 获取代码.我的代码的简化部分在顶部看起来像这样:
HHOOK mule;
HHOOK g_hKeyboardHook;
BOOL g_bFullscreen;
LRESULT CALLBACK LowLevelKeyboardProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
// By returning a non-zero value from the hook procedure, the
// message does not get passed to the target window
KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *) lParam;
BOOL bControlKeyDown = 0;
switch (nCode)
{
case HC_ACTION:
{
// Check to see if the CTRL key is pressed
bControlKeyDown = GetAsyncKeyState (VK_CONTROL) >> ((sizeof(SHORT) * 8) - 1);
// Disable CTRL+ESC
if (pkbhs->vkCode == VK_ESCAPE && bControlKeyDown)
return 1;
// Disable ALT+TAB
if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN)
return 1;
// Disable ALT+ESC
if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags & LLKHF_ALTDOWN)
return 1;
break;
}
default:
break;
}
return CallNextHookEx (mule, nCode, wParam, lParam);
}
我的主要是
int main(int argc, char **argv)
{
_getch();
g_hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandle(NULL), 0 );
cout << "Testing task keys disabling (alt tab, ctrl esc, alt esc) and taskbar..." << endl;
_getch();
UnhookWindowsHookEx( g_hKeyboardHook );
cout << "Re enabled" << endl;
_getch();
return 0;
}
我意识到这段代码是用于真正的旧Windows操作系统的，但是我环顾四周，其他解决方案也类似于该代码，因此我认为它应该可以工作.
但是由于某种原因，它似乎无法正常工作.每当我的程序到达该行代码时，该程序就会停顿5秒钟左右并继续运行，但是任务键仍在起作用.
我听说我应该将该功能实现为dll，而不是将所有内容都放在一个文件中，但是我不确定它们是否绝对正确(我也不了解dll)
此外，我还在这里尝试过代码(禁用Windows键):解决方案
您的代码很好，钩子不适用于控制台应用程序，因为Windows无法回调到控制台应用程序，这需要消息循环.
请阅读汉斯·帕桑特(Hans Passant)的此答案，
I've done a lot of searching around with no real solution (to my own problem) so I thought I'd ask here.
I'm designing a kiosk-like program that prevents the user from using task keys (alt+tab, alt+esc, ctrl+esc, etc) while the program is running. Note I'm a novice programmer thus I'd want to stay away from separate dll handling if I can. Particularly, I have went to this site http://support.microsoft.com/kb/226359/en-us for the code. A simplified part of my code looks like this at the top:
HHOOK mule;
HHOOK g_hKeyboardHook;
BOOL g_bFullscreen;
LRESULT CALLBACK LowLevelKeyboardProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
// By returning a non-zero value from the hook procedure, the
// message does not get passed to the target window
KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *) lParam;
BOOL bControlKeyDown = 0;
switch (nCode)
{
case HC_ACTION:
{
// Check to see if the CTRL key is pressed
bControlKeyDown = GetAsyncKeyState (VK_CONTROL) >> ((sizeof(SHORT) * 8) - 1);
// Disable CTRL+ESC
if (pkbhs->vkCode == VK_ESCAPE && bControlKeyDown)
return 1;
// Disable ALT+TAB
if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN)
return 1;
// Disable ALT+ESC
if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags & LLKHF_ALTDOWN)
return 1;
break;
}
default:
break;
}
return CallNextHookEx (mule, nCode, wParam, lParam);
}
The my main is
int main(int argc, char **argv)
{
_getch();
g_hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandle(NULL), 0 );
cout << "Testing task keys disabling (alt tab, ctrl esc, alt esc) and taskbar..." << endl;
_getch();
UnhookWindowsHookEx( g_hKeyboardHook );
cout << "Re enabled" << endl;
_getch();
return 0;
}
I realize this code is for really old windows OS, but I've looked around and the other solutions resemble this code so I thought it should work.
But for some reason it doesn't seem to be working. Whenever my program gets to that line of code, the program stalls for like 5 seconds and continues to run, but the task keys are still working.
I've heard that I should be implementing that function as a dll instead of putting everything in one file, but I'm not sure if they're absolutely right (also I know nothing of dlls)
In addition, I've also tried code (to disable windows key) here: http://msdn.microsoft.com/en-us/library/windows/desktop/ee416808(v=vs.85).aspx and it does the same thing my own program (stalls and does nothing)
Can anyone spot where I did something wrong? I'm using VC++ 2010 on windows 7 64bit.
Your code is fine, hooks just doesn't work with console application because windows can't callback into a console application, it requires a message loop.
Read this answer by Hans Passant which applies here too.
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