Electron 通过WM进程操作

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基础操作

  1. 启动进程

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    const { exec } = require("child_process");
    exec('start ' + exePath, (error, stdout, stderr) => {
         if (error) {
            console.log('ComeCapture启动失败');
            return;
         }
         findHwnd();
    });

  2. 获取句柄

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    user32.FindWindowW(null, Text('ComeCapture'));

  3. 显示进程窗口

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    user32.ShowWindow(hwnd, 3);

  4. 发送指令

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    user32.SendMessageW(hwnd, 16, 0, 0);

完整代码

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const ffi = require('ffi-napi')
const { exec } = require("child_process");
var screenshot = function() {

    var user32 = new ffi.Library("user32", {
        'ShowWindow': ['int', ['int', 'int']],
        'FindWindowW': ['int', ['string', 'string']],
        'DestroyWindow': ['bool', ['int']],
        'SendMessageW': ['int', ['int', 'int', 'long', 'long']]
    })
    var hwnd = null;
    var errorCount = 0;
    const exePath = "D:\\Test\\screenshot\\ComeCapture\\bin\\Debug\\ComeCapture.exe";

    function Text(text) {
        return Buffer.from(`${text}\0`, "ucs2");
    }

    function start() {
        exec('start ' + exePath, (error, stdout, stderr) => {
            if (error) {
                console.log('ComeCapture启动失败');
                return;
            }
            findHwnd();
        });
    }

    function findHwnd() {
        //获取截图窗体句柄
        return new Promise((resolve, reject) => {
            let result = user32.FindWindowW(null, Text('ComeCapture'));
            if (result == 0) {
                if (errorCount > 5) {
                    errorCount = 0;
                    start();
                    return;
                }
                errorCount++;
                setTimeout(() => {
                    findHwnd();
                }, 200)
            } else {
                //hwnd = result.toString(16);
                hwnd = result;
                errorCount = 0;
                console.log("ComeCapture hwnd:" + hwnd);
                resolve();
            }
        })

    }


    function run() {
        findHwnd().then(() => {
            user32.ShowWindow(hwnd, 3);
        });
    }

    function dispose() {
        findHwnd().then(() => {
            user32.SendMessageW(hwnd, 16, 0, 0);
        });

    }
    return {
        init: () => start(),
        run: () => run(),
        dispose: () => dispose()
    }
}
module.exports = new screenshot();

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