GetAsyncKeyState()=========================
功能:确定用户当前是否按下了键盘上的一个键
原型:SHORT GetAsyncKeyState(int vKey);
参数:nVirtKey指出要检查键的虚键代码。结果的高位指出该键当前是否被按下(是为1,否为0)。
常用键的VK值:
VK_SHIFT Shift键
VK_LSHIFT 左Shift键
VK_RSHIFT 右Shift键
VK_CONTROL Ctrl键
VK_LCONTROL 左Ctrl键
VK_RCONTROL 右Ctril键
VK_MENU Alt键
VK_LMENU 左Alt键
VK_RMENU 右Alt键
VK_LBUTTON 鼠标左键
VK_RBUTTON 鼠标右键
另一个函数GetKeyState与GetAsyncKeyState函数不同。GetAsyncKeyState在按下某键的同时调用,判断正在按下某键。
GetKeyState则在按过某键之后再调用,它返回最近的键盘消息从线程的队列中移出时的键盘状态,判断刚按过了某键。
与RegisterHotKey()相比,GetAsyncKeyState()的优点在于可以监控鼠标按键,缺点是需要使用定时器,并且无法保证热键的惟一性。
;<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ; 文件名: HotKey2.asm ; 作 者: Purple Endurer ; 功 能: 演示定时器SetTimer()和GetAsyncKeyState() ; 点击“监测Alt+鼠标右键! 成功后按 ; Alt+鼠标右键可打开记事本!”按钮, ; 则尝试监测Alt+鼠标右键是否按下 ; 如果尝试不成功,则提示出错信息! ; 如果尝试成功,则按Alt+鼠标右键时, ; 可将当前程序窗口恢复到前台 ; 并启动计事本! ; 开发环境:Windows 2000 Pro + MASM32 ; 注:源代码和可执行程序可以到http://purpleendurer.ys168.com下载 ; ; Date log ;------------------------------------------------- ;2006-03-09 创建! ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< .386 .model flat, stdcall option casemap: none include /masm32/ include/windows.inc include /masm32/ include/user32.inc include /masm32/ include/kernel32.inc include /masm32/ include/shell32.inc includelib /masm32/ lib/user32.lib includelib /masm32/ lib/kernel32.lib includelib /masm32/ lib/shell32.lib WinMain proto : DWORD, : DWORD, : DWORD, : DWORD m_m2m MACRO d1, d2 push d2 pop d1 ENDM .const c_ButtonID equ 1 c_TimerID equ 1 .data g_szWinClsName db "DemoWinClass", 0 g_szAppName db "系统演示程序2 by PurpleEndurer", 0 g_szBtnClsName db "button", 0 g_szFailSetTimer db "不能" g_szRegisterKey db "监测Alt+鼠标右键! 成功后按Alt+鼠标右键可打开记事本!", 0 g_szFailKillTimer db "不能" g_szUnregisterKey db "停止监测Alt+鼠标右键!", 0 g_bRegisted dword FALSE g_szOpen db "Open", 0 g_szNotePad db "NotePad", 0 .data? hInstance HINSTANCE ? CommandLine LPSTR ? g_hwndButton HANDLE ? .code start: invoke GetModuleHandle, NULL mov hInstance, eax invoke GetCommandLine mov CommandLine, eax invoke WinMain, hInstance, NULL, CommandLine, SW_SHOWDEFAULT invoke ExitProcess, eax WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow: DWORD LOCAL wc:WNDCLASSEX LOCAL msg:MSG LOCAL hwnd:HWND mov wc.cbSize, SIZEOF WNDCLASSEX mov wc.style, CS_HREDRAW or CS_VREDRAW mov wc.lpfnWndProc, OFFSET WndProc mov wc.cbClsExtra, NULL mov wc.cbWndExtra, NULL push hInstance pop wc.hInstance mov wc.hbrBackground, COLOR_WINDOW+1 mov wc.lpszMenuName, NULL mov wc.lpszClassName, OFFSET g_szWinClsName invoke LoadIcon, NULL, IDI_APPLICATION mov wc.hIcon, eax mov wc.hIconSm, eax invoke LoadCursor, NULL, IDC_ARROW mov wc.hCursor, eax invoke RegisterClassEx, addr wc INVOKE CreateWindowEx, NULL, ADDR g_szWinClsName, ADDR g_szAppName, / WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, / CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, / hInst, NULL mov hwnd, eax invoke ShowWindow, hwnd, SW_SHOWNORMAL invoke UpdateWindow, hwnd .WHILE TRUE invoke GetMessage, ADDR msg, NULL, 0, 0 .BREAK .IF (! eax) invoke TranslateMessage, ADDR msg invoke DispatchMessage, ADDR msg .ENDW mov eax, msg.wParam ret WinMain endp WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM .IF uMsg==WM_DESTROY .if g_bRegisted== TRUE invoke KillTimer, hWnd, c_TimerID .endif invoke PostQuitMessage, NULL .ELSEIF uMsg==WM_CREATE ;创建按钮 invoke CreateWindowEx, NULL, ADDR g_szBtnClsName, ADDR g_szRegisterKey, / WS_CHILD or WS_VISIBLE or BS_DEFPUSHBUTTON,/ 25, 25, 560, 50, hWnd, c_ButtonID, hInstance, NULL mov g_hwndButton, eax .ELSEIF uMsg==WM_COMMAND mov eax, wParam .IF lParam!=0 .IF ax==c_ButtonID shr eax, 16 .IF ax==BN_CLICKED .if g_bRegisted== TRUE ;禁用监测 invoke KillTimer, hWnd, c_TimerID .IF eax==0 invoke MessageBox, hWnd, ADDR g_szFailKillTimer,/ ADDR g_szAppName, MB_IC ONERROR ret .ENDIF m_m2m g_bRegisted, FALSE ;修改按钮的文本 invoke SetWindowText, g_hwndButton, ADDR g_szRegisterKey .else ;启用监测 invoke SetTimer, hWnd, c_TimerID, 100, NULL .IF eax==0 invoke MessageBox, hWnd, ADDR g_szFailSetTimer,/ ADDR g_szAppName, MB_IC ONERROR ret .ENDIF m_m2m g_bRegisted, TRUE ;修改按钮的文本 invoke SetWindowText, g_hwndButton, ADDR g_szUnregisterKey .endif .ENDIF .ENDIF .ENDIF .ELSEIF uMsg==WM_TIMER invoke GetAsyncKeyState, VK_LMENU ;左Alt键 test eax, 08000h jz @F invoke GetAsyncKeyState, VK_RBUTTON ;鼠标右键 test eax, 08000h jz @F ;把本程序窗口恢复到前台 invoke ShowWindow, hWnd, SW_RESTORE invoke SetForegroundWindow, hWnd ;打开记事本 invoke ShellExecute, hWnd, ADDR g_szOpen, ADDR g_szNotePad, NULL, NULL, SW_RESTORE @@: .ELSE invoke DefWindowProc, hWnd, uMsg, wParam, lParam ret .ENDIF xor eax, eax ret WndProc endp end