触发操作系统以编程方式复制（ctrl + c或Ctrl-x）

Question

I'm working on a program to trigger cut and pastes

Pastes I have no problem with (I just dump a string into the clipboard)

Cut and or Copys are proving to be a little more difficult

The program I have is out of focus and has several hot keys registered with the os CTRL + ALT + 2 CTRL + ALT + 3 etc)

That I want to use to trigger Windows to copy anything that is highlighted in the window that is focused

I tried doing a sendkeys

SendKeys.Send("^c");

but that seems to work once or twice if at all then stop working.

is there a better way to try to trigger windows into coping highlighted content on a different window

Answer 1

One way to do this is by using the Win32 SendInput function. With SendInput , you have to simulate both the key down and key up events in order for the full key press to register. To simulate CTRL + C , you'd have to do:

• CTRL key down
• C key down
• C key up
• CTRL key up

pinvoke.net has some examples of SendInput usage. One issue to be mindful of is if the key is already pressed. You can use GetAsyncKeyState to only simulate a key down event if the key is not already down.

Below is some example code of how you could simulate CTRL + C . With the code below, you can simply call Keyboard.SimulateKeyStroke('c', ctrl: true); Note that this works as if the user literally pressed CTRL + C , so the active application will behave as it always does when such an event happens (ie if nothing is normally copied, then nothing will be copied with this method, either).

Edit: See David's comment below about batching the sent input. The code below should be sending the entire sequence of input events through a single call to SendInput to avoid being interleaved (and misinterpreted) with real user input events.

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Threading;

namespace SimulateKeys
{
    static class Keyboard
    {
        public static void SimulateKeyStroke(char key, bool ctrl = false, bool alt = false, bool shift = false)
        {
            List<ushort> keys = new List<ushort>();

            if (ctrl)
                keys.Add(VK_CONTROL);

            if (alt)
                keys.Add(VK_MENU);

            if (shift)
                keys.Add(VK_SHIFT);

            keys.Add(char.ToUpper(key));

            INPUT input = new INPUT();
            input.type = INPUT_KEYBOARD;
            int inputSize = Marshal.SizeOf(input);

            for (int i = 0; i < keys.Count; ++i)
            {
                input.mkhi.ki.wVk = keys[i];

                bool isKeyDown = (GetAsyncKeyState(keys[i]) & 0x10000) != 0;

                if (!isKeyDown)
                    SendInput(1, ref input, inputSize);
            }

            input.mkhi.ki.dwFlags = KEYEVENTF_KEYUP;
            for (int i = keys.Count - 1; i >= 0; --i)
            {
                input.mkhi.ki.wVk = keys[i];
                SendInput(1, ref input, inputSize);
            }
        }

        [DllImport("user32.dll")]
        static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);

        [DllImport("user32.dll")]
        static extern short GetAsyncKeyState(ushort vKey);

        struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public uint mouseData;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        struct HARDWAREINPUT
        {
            public int uMsg;
            public short wParamL;
            public short wParamH;
        }

        [StructLayout(LayoutKind.Explicit)]
        struct MOUSEKEYBDHARDWAREINPUT
        {
            [FieldOffset(0)]
            public MOUSEINPUT mi;

            [FieldOffset(0)]
            public KEYBDINPUT ki;

            [FieldOffset(0)]
            public HARDWAREINPUT hi;
        }

        struct INPUT
        {
            public int type;
            public MOUSEKEYBDHARDWAREINPUT mkhi;
        }

        const int INPUT_KEYBOARD = 1;
        const uint KEYEVENTF_KEYUP = 0x0002;

        const ushort VK_SHIFT = 0x10;
        const ushort VK_CONTROL = 0x11;
        const ushort VK_MENU = 0x12;
    }

    class Program
    {
        static void Main(string[] args)
        {
            Thread.Sleep(3000);
            Keyboard.SimulateKeyStroke('c', ctrl: true);
        }
    }
}

Answer 2

如果您可以从焦点窗口中获取所选文本（可能是一个更容易解决的问题），那么最好使用System.Windows.Forms.Clipboard类的SetText方法。