C#全局键盘钩子,从控制台应用程序打开一个表单[复制]
作者:互联网
参见英文答案 > Capture a keyboard keypress in the background 2个
所以我有一个带有Form的C#控制台应用程序,我想用热键打开它.比方说,例如Ctrl<打开表格.所以我现在得到了处理globalkeylistener的代码,但看起来我实现它失败了.它创建了一个while循环来阻止它关闭程序,我尝试使用kbh_OnKeyPressed方法从用户那里获得输入.
我试着用这种方式实现它:
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace Globalkey
{
static class Program
{
[DllImport("user32.dll")]
private static extern bool RegisterHotkey(int id, uint fsModifiers, uint vk);
private static bool lctrlKeyPressed;
private static bool f1KeyPressed;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
LowLevelKeyboardHook kbh = new LowLevelKeyboardHook();
kbh.OnKeyPressed += kbh_OnKeyPressed;
kbh.OnKeyUnpressed += kbh_OnKeyUnpressed;
kbh.HookKeyboard();
while(true) { }
}
private static void kbh_OnKeyUnpressed(object sender, Keys e)
{
if (e == Keys.LControlKey)
{
lctrlKeyPressed = false;
Console.WriteLine("CTRL unpressed");
}
else if (e == Keys.F1)
{
f1KeyPressed = false;
Console.WriteLine("F1 unpressed");
}
}
private static void kbh_OnKeyPressed(object sender, Keys e)
{
if (e == Keys.LControlKey)
{
lctrlKeyPressed = true;
Console.WriteLine("CTRL pressed");
}
else if (e == Keys.F1)
{
f1KeyPressed = true;
Console.WriteLine("F1 pressed");
}
CheckKeyCombo();
}
static void CheckKeyCombo()
{
if (lctrlKeyPressed && f1KeyPressed)
{
Application.Run(new Form1());
}
}
}
}
解决方法:
你需要的是一个低级键盘钩.
这可能看起来像这样:
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class LowLevelKeyboardHook
{
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private const int WM_SYSKEYDOWN = 0x0104;
private const int WM_KEYUP = 0x101;
private const int WM_SYSKEYUP = 0x105;
[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);
public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
public event EventHandler<Keys> OnKeyPressed;
public event EventHandler<Keys> OnKeyUnpressed;
private LowLevelKeyboardProc _proc;
private IntPtr _hookID = IntPtr.Zero;
public LowLevelKeyboardHook()
{
_proc = HookCallback;
}
public void HookKeyboard()
{
_hookID = SetHook(_proc);
}
public void UnHookKeyboard()
{
UnhookWindowsHookEx(_hookID);
}
private 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 IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
OnKeyPressed.Invoke(this, ((Keys)vkCode));
}
else if(nCode >= 0 && wParam == (IntPtr)WM_KEYUP ||wParam == (IntPtr)WM_SYSKEYUP)
{
int vkCode = Marshal.ReadInt32(lParam);
OnKeyUnpressed.Invoke(this, ((Keys)vkCode));
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
}
要实现它,您可以使用以下内容:
kbh = new LowLevelKeyboardHook();
kbh.OnKeyPressed += kbh_OnKeyPressed;
kbh.OnKeyUnpressed += kbh_OnKeyUnpressed;
kbh.HookKeyboard();
事件可以这样处理:
bool lctrlKeyPressed;
bool f1KeyPressed;
void kbh_OnKeyPressed(object sender, Keys e)
{
if (e == Keys.LControlKey)
{
lctrlKeyPressed = true;
}
else if (e == Keys.F1)
{
f1KeyPressed= true;
}
CheckKeyCombo();
}
void kbh_OnKeyUnPressed(object sender, Keys e)
{
if (e == Keys.LControlKey)
{
lctrlKeyPressed = false;
}
else if (e == Keys.F1)
{
f1KeyPressed= false;
}
}
void CheckKeyCombo()
{
if (lctrlKeyPressed && f1KeyPressed)
{
//Open Form
}
}
为了实际理解,我建议你阅读P / Invoke.这是利用Windows提供的非托管API.
有关P / Invoke possibilites的完整列表,pinvoke.net是一个很好的来源.
为了更好地理解,The official MSDN Website也是一个很好的来源.
编辑:
看起来你实际上使用的是控制台应用程序,而不是WinForm.在这种情况下,您必须以不同的方式运行程序:
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
LowLevelKeyboardHook kbh = new LowLevelKeyboardHook();
kbh.OnKeyPressed += kbh_OnKeyPressed;
kbh.OnKeyUnpressed += kbh_OnKeyUnpressed;
kbh.HookKeyboard();
Application.Run();
kbh.UnHookKeyboard();
}
Application Class的Run()方法为您的应用程序启动标准循环.这对于Hook工作是必要的,因为据我所知,没有这个循环的仅仅是控制台应用程序无法触发那些全局键事件.
使用此实现,按下并释放已定义的键将提供以下输出:
注意:我明显更换了
Application.Run(new Form1());
在CheckKeyCombo()方法中
Console.WriteLine(“KeyCombo press”);
标签:c,hotkeys,forms,global-hotkey 来源: https://codeday.me/bug/20190611/1216966.html