Electron调用Delphi窗体Dll

一、环境准备：

调用Dll需要安装node-ffi-napi，由于node-ffi-napi包含 C 原生代码，所以安装需要配置 Node 原生插件编译环境

https://github.com/node-ffi-napi/node-ffi-napi

npm install --global --production windows-build-tools
npm install -g node-gyp
npm install ffi-napi

二、Delphi窗体Dll编写

2.1 Project1代码

library Project1;

uses
  System.SysUtils,
  System.Classes,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.res}

exports
  ShowForm;

begin

end.

2.2 窗体单元代码Unit1

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
  System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
procedure ShowForm; stdcall;// 需要从DLL中导出的函数，一定要有stdcall关键字

implementation


procedure ShowForm; stdcall;
begin
  try
    Form1 := TForm1.Create(nil);
    try
      Form1.ShowModal;
    finally
      Form1.Free;
    end;
  except
    on E: Exception do
      ShowMessage(E.ToString);
  end;
end;

{$R *.dfm}

end.

三、将编译好Dll放入程序目录下，然后再Electron主进程main.js中引用Dll

// 调用Dll
const ffi = require('ffi-napi');
var libm = ffi.Library('Project1.dll', {
  'ShowForm': ['void', []],
});
libm.ShowForm();

四、如果是渲染进程（web页面）要调用，则需要通过主进程与渲染进程通信，然后调用

4.1 主进程main.js

// 获取ipc
const {ipcMain} = require('electron')
// 调用Dll
const ffi = require('ffi-napi');
var libm = ffi.Library('Project1.dll', {
  'ShowForm': ['void', []],
});
// 监听ipc通道
ipcMain.on('showForm', e => libm.ShowForm());

4.2 渲染进程调用，以Vue为例