在 Node-FFI 中使用 SendInput

我想使用 Nodejs 中 Windows Api 的 SendInput 函数，使用 FFI 包。

我对 C 的了解有限，所以我无法真正弄清楚我遇到了什么问题， 我基本上是想虚拟地按下键盘上的一个键。

这就是我的代码：

var ffi = require('ffi');
var ref = require ('ref');
var struct = require ('ref-struct');

var keyboardInput = struct({
    'type': 'int',
    'wVK': 'int',
    'wScan': 'int',
    'dwFlags': 'int',
    'time': 'int',
    'dwExtraInfo': 'int64'
});

var keyboardInputPtr = ref.refType(keyboardInput);
var keyboard = new keyboardInput();
keyboard.type = 1;
keyboard.wVK = 0x41;
keyboard.wScan = 0;
keyboard.dwFlags = 2;
keyboard.time = 0;
keyboard.dwExtraInfo = 0;

var user32 = ffi.Library('user32', {
    'SendInput': [ 'int', [ 'uint', keyboardInputPtr, 'int' ] ]
});

setInterval(function(){
    var r = user32.SendInput(1, keyboard.ref(), 40);
    console.log(r);
}, 500);

它在控制台中记录了我一个“1”，这不应该意味着它可以工作吗？因为我打开记事本时没有按下任何键。

我终于找到了使用方法node-ffi/node-ffi-napi使用以下命令输入按键SendInput功能！ （下面的当前代码使用node-ffi-napi, since node-ffi已无人维护/损坏；查看编辑历史记录node-ffi版本，api几乎一模一样）

但是，请注意，您可以通过两种方式调用 SendInput 函数，如下所示：https://autohotkey.com/boards/viewtopic.php?p=213617#p213617

就我而言，我必须使用第二种（扫描代码）方法，因为第一种（虚拟密钥）方法在我需要密钥模拟的程序中不起作用。

废话不多说，完整的解决方案如下：

import keycode from "keycode";
import ffi from "ffi-napi";
import ref from "ref-napi";
import os from "os";
import import_Struct from "ref-struct-di";

var arch = os.arch();
const Struct = import_Struct(ref);

var Input = Struct({
    "type": "int",

    // For some reason, the wScan value is only recognized as the wScan value when we add this filler slot.
    // It might be because it's expecting the values after this to be inside a "wrapper" substructure, as seen here:
    //     https://msdn.microsoft.com/en-us/library/windows/desktop/ms646270(v=vs.85).aspx
    "???": "int",
     
    "wVK": "short",
    "wScan": "short",
    "dwFlags": "int",
    "time": "int",
    "dwExtraInfo": "int64"
});

var user32 = ffi.Library("user32", {
    SendInput: ["int", ["int", Input, "int"]],
    MapVirtualKeyExA: ["uint", ["uint", "uint", "int"]],
});

const extendedKeyPrefix = 0xe000;
const INPUT_KEYBOARD = 1;
const KEYEVENTF_EXTENDEDKEY = 0x0001;
const KEYEVENTF_KEYUP       = 0x0002;
const KEYEVENTF_UNICODE     = 0x0004;
const KEYEVENTF_SCANCODE    = 0x0008;
//const MAPVK_VK_TO_VSC = 0;

export class KeyToggle_Options {
    asScanCode = true;
    keyCodeIsScanCode = false;
    flags?: number;
    async = false; // async can reduce stutter in your app, if frequently sending key-events
}

let entry = new Input(); // having one persistent native object, and just changing its fields, is apparently faster (from testing)
entry.type = INPUT_KEYBOARD;
entry.time = 0;
entry.dwExtraInfo = 0;
export function KeyToggle(keyCode: number, type = "down" as "down" | "up", options?: Partial<KeyToggle_Options>) {
    const opt = Object.assign({}, new KeyToggle_Options(), options);
    
    // scan-code approach (default)
    if (opt.asScanCode) {
        let scanCode = opt.keyCodeIsScanCode ? keyCode : ConvertKeyCodeToScanCode(keyCode);
        let isExtendedKey = (scanCode & extendedKeyPrefix) == extendedKeyPrefix;

        entry.dwFlags = KEYEVENTF_SCANCODE;
        if (isExtendedKey) {
            entry.dwFlags |= KEYEVENTF_EXTENDEDKEY;
        }

        entry.wVK = 0;
        entry.wScan = isExtendedKey ? scanCode - extendedKeyPrefix : scanCode;
    }
    // (virtual) key-code approach
    else {
        entry.dwFlags = 0;
        entry.wVK = keyCode;
        //info.wScan = 0x0200;
        entry.wScan = 0;
    }

    if (opt.flags != null) {
        entry.dwFlags = opt.flags;
    }
    if (type == "up") {
        entry.dwFlags |= KEYEVENTF_KEYUP;
    }

    if (opt.async) {
        return new Promise((resolve, reject)=> {
            user32.SendInput.async(1, entry, arch === "x64" ? 40 : 28, (error, result)=> {
                if (error) reject(error);
                resolve(result);
            });
        });
    }
    return user32.SendInput(1, entry, arch === "x64" ? 40 : 28);
}

export function KeyTap(keyCode: number, opt?: Partial<KeyToggle_Options>) {
    KeyToggle(keyCode, "down", opt);
    KeyToggle(keyCode, "up", opt);
}

export function ConvertKeyCodeToScanCode(keyCode: number) {
    //return user32.MapVirtualKeyExA(keyCode, MAPVK_VK_TO_VSC, 0);
    return user32.MapVirtualKeyExA(keyCode, 0, 0);
}

要使用它，请致电：

KeyTap(65); // press the A key

或者，如果您正在使用关键代码 npm 包:

import keycode from "keycode";
KeyTap(keycode.codes.a);