108 lines
3.9 KiB
C#
108 lines
3.9 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading;
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namespace GlobalKeyboardHook
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{
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class Program
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{
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// Define the hook type
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const int WH_KEYBOARD_LL = 13;
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const int WM_KEYDOWN = 0x0100;
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const int WM_KEYUP = 0x0101;
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// Define the key codes
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const int VK_RETURN = 0x0D; // Enter key
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// Declare the hook handle and the hook procedure
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private static IntPtr hookId = IntPtr.Zero;
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private static StringBuilder scannedData = new StringBuilder();
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// Define the delegate for the hook procedure
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private static LowLevelKeyboardProc _proc = HookCallback;
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// P/Invoke to set the hook
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[DllImport("user32.dll", CharSet = CharSet.Auto)]
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public static extern IntPtr SetWindowsHookEx(int hookType, LowLevelKeyboardProc callback, IntPtr hInstance, uint threadId);
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[DllImport("user32.dll")]
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public static extern bool UnhookWindowsHookEx(IntPtr hookId);
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[DllImport("user32.dll", CharSet = CharSet.Auto)]
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public static extern IntPtr CallNextHookEx(IntPtr hookId, int nCode, IntPtr wParam, IntPtr lParam);
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[DllImport("kernel32.dll")]
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public static extern IntPtr GetModuleHandle(string lpModuleName);
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// The delegate type for the hook procedure
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public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
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static void Main(string[] args)
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{
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// Hook the keyboard input globally
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hookId = SetHook(_proc);
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// Wait for the user to terminate the application
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Console.WriteLine("请扫描条形码...");
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Console.WriteLine("按 ESC 键退出程序。");
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// Loop indefinitely until the user presses the ESC key
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while (true)
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{
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if (Console.KeyAvailable && Console.ReadKey(true).Key == ConsoleKey.Escape)
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{
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break; // Exit the loop and terminate the application
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}
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Thread.Sleep(10); // Sleep to avoid high CPU usage
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}
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// Unhook the keyboard input when done
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UnhookWindowsHookEx(hookId);
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}
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// Set the hook for keyboard input
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private static IntPtr SetHook(LowLevelKeyboardProc proc)
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{
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using (var curProcess = System.Diagnostics.Process.GetCurrentProcess())
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using (var curModule = curProcess.MainModule)
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{
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return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
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}
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}
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// The callback function that will be called when a key is pressed or released
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private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
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{
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if (nCode >= 0 && (int)wParam == WM_KEYDOWN)
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{
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// Get the key code
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int vkCode = Marshal.ReadInt32(lParam);
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// If the key is Enter (Carriage Return), treat it as the end of the barcode
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if (vkCode == VK_RETURN)
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{
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// Print the scanned data
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string data = scannedData.ToString();
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Console.WriteLine($"\n条码扫描完成，扫描到的数据是: {data}");
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// Clear the scanned data for the next scan
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scannedData.Clear();
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}
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else
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{
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// Append the character corresponding to the key code
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char keyChar = (char)vkCode;
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scannedData.Append(keyChar);
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// Print the character in real-time (optional)
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Console.Write(keyChar);
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}
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}
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// Call the next hook in the chain
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return CallNextHookEx(hookId, nCode, wParam, lParam);
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}
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}
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}
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