概述
最近总要在笔记本电脑前面写东西，所以一般把本子放在键盘上。但是又容易不小心按了哪个键。所以写了个键盘锁，这样锁起来之后按什么键都不起作用了。主要是使用了 Hook 技术。
可能有谁也会需要到，就贴在这里了。
另外，关于气泡提示中的 timeout 的变量好像不是很准，我设置了 1000 毫秒，但是基本上要等上 10 秒左右才能消失。暂时还不知道是什么原因。
#define
_WIN32_IE 0x0500
#include
<
windows.h
>
enum
...
{
WM_TRAYICON = WM_USER + 100, //自定义托盘消息 ID_LOCK, ID_UNLOCK, ID_EXIT
}
;HHOOK KBhook
=
NULL;
//
钩子句柄
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);LRESULT CALLBACK KeyboardHookProc(
int
nCode, WPARAM wParam, LPARAM lParam);
//
键盘钩子回调函数
void
TrayMessage(HWND hwnd, LPCTSTR szText);
//
显示托盘气泡信息
void
DestroyTrayIcon(HWND hwnd);
//
删除托盘图标
void
CreateTrayMenu(HWND hwnd);
//
建立托盘菜单
int
EnableKeyboardCapture();
//
激活键盘钩子
int
DisableKeyboardCapture();
//
解除键盘钩子
void
OnLock(HWND hwnd);
void
OnUnlock(HWND hwnd);
int
WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine,
int
iCmdShow)
...
{ HWND hwnd; MSG msg; NOTIFYICONDATA IconData; WNDCLASS wndclass;
static TCHAR szAppName[] = ...{"Keyboard Lock"}; //初始化窗口 wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hCursor = LoadCursor(NULL, IDI_APPLICATION); wndclass.hIcon = LoadIcon(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.hInstance = hInstance; wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName; RegisterClass(&wndclass); hwnd = CreateWindow(szAppName, szAppName, WS_OVERLAPPEDWINDOW, 0, 0, 0, 0, 0, 0, hInstance, NULL); //这里之后不需要显示窗口，新建托盘图标，操作全部在托盘图标上完成 //Warning: HWND 和 HINSTANCE 不对的话，就会有问题 IconData.cbSize = sizeof(NOTIFYICONDATA); IconData.hWnd = hwnd; IconData.uID = (UINT)hInstance; IconData.hIcon = LoadIcon(0, MAKEINTRESOURCE(IDI_INFORMATION)); IconData.uFlags = NIF_MESSAGE + NIF_ICON + NIF_TIP; IconData.uCallbackMessage = WM_TRAYICON; strcpy(IconData.szTip, "键盘锁"); Shell_NotifyIcon(NIM_ADD, &IconData); while(GetMessage(&msg, NULL, 0, 0)) ...{ TranslateMessage(&msg); DispatchMessage(&msg);
} return msg.wParam;}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
...
{ switch (message) ...{ case WM_COMMAND: if(HIWORD(wParam) == 0) ...{ //菜单动作的消息 switch (LOWORD(wParam)) ...{ case ID_LOCK: OnLock(hwnd); break; case ID_UNLOCK: OnUnlock(hwnd); break; case ID_EXIT: ::DestroyWindow(hwnd); break; } } break; case WM_TRAYICON: switch (lParam) ...{ case WM_LBUTTONDOWN: CreateTrayMenu(hwnd); break; } break; case WM_DESTROY: DestroyTrayIcon(hwnd); PostQuitMessage(0); break; } return DefWindowProc(hwnd, message, wParam, lParam);}
LRESULT CALLBACK KeyboardHookProc(
int
nCode, WPARAM wParam, LPARAM lParam)
...
{ //是键盘的动作全部忽略 if (nCode == HC_ACTION) return 1; return CallNextHookEx(NULL, nCode, wParam, lParam);}
int
EnableKeyboardCapture()
...
{ // 13 表示使用低级键盘钩子，和 WM_KEYBOARD 不同 KBhook = !KBhook ? SetWindowsHookEx(13, (HOOKPROC)KeyboardHookProc, (HINSTANCE)GetModuleHandle(NULL), 0) : KBhook; return (KBhook ? 1 : -1);}
int
DisableKeyboardCapture()
...
{ if (KBhook == NULL) ...{ return 0; } else ...{ BOOL flag; flag = UnhookWindowsHookEx(KBhook); KBhook = NULL; return (flag ? 1 : -1); }}
void
TrayMessage(HWND hwnd, LPCTSTR szText)
...
{ NOTIFYICONDATA nid; nid.cbSize = sizeof(NOTIFYICONDATA); nid.hWnd = hwnd; nid.uID = (UINT)GetModuleHandle(NULL); nid.uFlags = NIF_INFO | NIF_ICON; nid.dwInfoFlags = NIIF_INFO; nid.uTimeout = 1000; nid.hIcon = LoadIcon(0, MAKEINTRESOURCE(IDI_INFORMATION)); wsprintf(nid.szInfo, szText); strcpy(nid.szInfoTitle, "键盘锁"); Shell_NotifyIcon(NIM_MODIFY, &nid);}
void
DestroyTrayIcon(HWND hwnd)
...
{ NOTIFYICONDATA nid; nid.cbSize = sizeof(nid); nid.uID = (UINT)GetModuleHandle(NULL); nid.hWnd = hwnd; nid.uFlags = 0; Shell_NotifyIcon(NIM_DELETE, &nid);}
void
CreateTrayMenu(HWND hwnd)
...
{ HMENU hMenu; hMenu = CreatePopupMenu(); AppendMenu(hMenu, MF_STRING, ID_LOCK, "锁定键盘"); AppendMenu(hMenu, MF_STRING, ID_UNLOCK, "解锁键盘"); AppendMenu(hMenu, MF_SEPARATOR, 0, NULL); AppendMenu(hMenu, MF_STRING, ID_EXIT, "退出"); POINT pt; GetCursorPos(&pt); TrackPopupMenu(hMenu, TPM_RIGHTALIGN, pt.x, pt.y, 0, hwnd, NULL);}
void
OnUnlock(HWND hwnd)
...
{ switch (DisableKeyboardCapture()) ...{ case 0: TrayMessage(hwnd, "键盘没有锁定"); break; case 1: TrayMessage(hwnd, "键盘已经解锁"); break; case -1: TrayMessage(hwnd, "键盘解锁错误"); break; }}
void
OnLock(HWND hwnd)
...
{ switch (EnableKeyboardCapture()) ...{ case 1: TrayMessage(hwnd, "键盘已经锁定"); break; case -1: TrayMessage(hwnd, "键盘锁定错误"); break; }}
最后
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