精品课程网站建设企业查询

我是用这个键盘钩子来做扫码枪的，因为用UI做扫码枪有时候会有些问题

    _hookID = SetHook(_proc);//开启钩子UnhookWindowsHookEx(_hookID);//释放钩子#region 键盘钩子
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
static string HookInfo;
static string HookTest;
private const int VK_SHIFT = 0x10;
private const int VK_CAPITAL = 0x14;private static IntPtr SetHook(LowLevelKeyboardProc proc)
{using (Process curProcess = Process.GetCurrentProcess())using (ProcessModule curModule = curProcess.MainModule){return SetWindowsHookEx(WH_KEYBOARD_LL, proc,GetModuleHandle(curModule.ModuleName), 0);}
}
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN){int vkCode = Marshal.ReadInt32(lParam);string key = "";key = ((Keys)vkCode).ToString();HookTest += (Keys)vkCode;if ((Keys)vkCode != Keys.Return){HookInfo += (Keys)vkCode;}//if ((Keys)vkCode == Keys.Return)//{#region 判断大小写bool capsLock = (GetKeyState(VK_CAPITAL) & 0x0001) != 0;bool shiftPressed = (GetKeyState(VK_SHIFT) & 0x8000) != 0;if ((capsLock && !shiftPressed) || (!capsLock && shiftPressed)){key = key.ToUpper();}else{key = key.ToLower();}#endregionConsole.WriteLine(key);//}}return CallNextHookEx(_hookID, nCode, wParam, lParam);
}[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,IntPtr wParam, IntPtr lParam);[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName); [DllImport("user32.dll")]
private static extern short GetKeyState(int nVirtKey);#endregion//if (HookTest != null && HookTest.Contains("Return"))//{//    HookTest = "";//    CheckBarCode(HookInfo);//    HookInfo = "";//}