C# SolidWorks secondary development API ---Solidworks multi-open operation and connection specified version Solidworks

        Today, a netizen asked me about how to use Exe to operate multiple Solidworks. In fact, I have seen the solution before. It is obtained through the process and id, rather than the usual (SldWorks) Marshal.GetActiveObject("SldWorks.Application.Application. 27");

        So I came back to check some information at night and found a solution. I streamlined it and made a dll. You can try it.    

 ''' <summary>
    ''' 创建一个新的Solidworks并返回实例
    ''' </summary>
    ''' <param name="version">指定版本号，-1表示默认.</param>
    ''' <param name="suppressDialogs">True 则禁用solidworks弹出消息.</param>
    ''' <param name="requireMainWindow">True 表示运行完显示到主窗口</param>
    ''' <param name="startProcessTimeout">返回Null 如果SolidWorks在指定时间内没有打开。</param>
    ''' <param name="createWindowTimeout">返回Null 如果SolidWorks主窗口在指定时间内没有显示.</param>
    ''' <returns></returns>
    Public Shared Function RunSolidWorks(version As Integer,
                                         visible As Boolean,
                                         Optional suppressDialogs As Boolean = False,
                                         Optional requireMainWindow As Boolean = True,
                                         Optional startProcessTimeout As Integer = 30,
                                         Optional createWindowTimeout As Integer = 15) As SldWorks

        Dim executablePath As String = CTFileSystem.GetSolidWorksExecutablePath(version)

        If File.Exists(executablePath) = False Then Return Nothing

        Dim info As ProcessStartInfo = New ProcessStartInfo(executablePath)

        If suppressDialogs Then info.Arguments = "/r"

        Dim process As Process = Process.Start(info)
        Dim app As SldWorks = Nothing
        Dim t As DateTime = DateTime.Now

        While app Is Nothing
            Threading.Thread.Sleep(1000)
            If Math.Abs(DateTime.Now.Subtract(t).Seconds) > startProcessTimeout Then Return Nothing

            'If it were possible to get a GUID from a process ID then we could use GetActiveObject instead of this
            app = GetComObjectFromProcessId(process.Id)
        End While

        t = DateTime.Now
        While IsRunning(isMainWindowCreated:=True) = False
            Threading.Thread.Sleep(1000)
            If Math.Abs(DateTime.Now.Subtract(t).Seconds) > createWindowTimeout Then Return Nothing
        End While

        If visible = False Then
            Dim frame As Frame = app.Frame()
            If frame Is Nothing Then Return app
            Dim handle As IntPtr = frame.GetHWndx64()
            If ShowWindow(handle, 0) Then Return app
        End If

        Return app
    End Function

I just ran the test and it is relatively simple to use. I created two new solidworks 2018 windows with code:

        private SldWorks sldWorks2018_1 = null;
        private SldWorks sldWorks2018_2 = null;

        private void button1_Click(object sender, EventArgs e)
        {
            sldWorks2018_1 = PStandAlone.RunSolidWorks(26, true, false, false, 30, 15);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            sldWorks2018_2 = PStandAlone.RunSolidWorks(26, true, false, false, 30, 15);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            sldWorks2018_1.SendMsgToUser("From 2018 -1");
            sldWorks2018_2.SendMsgToUser("From 2018 -2");
        }

      

Source code https://gitee.com/painezeng/PSWStandalone (vb.net)