How to Configure “Gecko” with Vb.NET Forms Application

问题

I have been given a task to integrate Gecko browser component to a existing winform control, but the issue i m facing is how to configure dll, I am trying with different version as well, but no luck, at point it does not load dll and gives the error

Unable to find an entry point named 'NS_Alloc' in DLL 'xul'.

I have downloaded separately from given link. Xulrunner the latest and also the 29 but it says ,

An error occurred creating the form. See Exception.InnerException for details. The error is: Unable to load DLL 'xul': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Imports System.IO

Imports System.Xml Imports Gecko Imports Microsoft.Win32

Public Class Form1

Public Sub New()
    InitializeComponent()
    'D:\xulrunner\bin
    Xpcom.Initialize("D:\\xulrunner\\") 'xulrunner
    'Xpcom.Initialize("C:\Program Files (x86)\Mozilla Firefox\")
End Sub

End Class

please help me out if anybody has already done with that.

回答1:

Finally I managed to do so,

At the time of writing, I choose the latest version GeckoFX-33.0, and XULRunner 33.1. ,

Unpack the GeckoFX-330.zip, you will get below files:
GeckoFx Files
Add references to the dlls as shown above, click browse and select the Geckofx-Core.dll and Geckofx-Winforms.dll
In the toolbox, right click, and then select “Choose Item”, select Geckofx-Winforms.dll, and the Gecko winform control will be shown in the toolbox
Drag a GeckoWebBrowser control to the winform designer, and let’s call it “browse”

In the form1.cs file, add below code: AND FINALLY CODE:

            using System;
        using System.Collections.Generic;
        using System.ComponentModel;
        using System.Data;
        using System.Drawing;
        using System.Linq;
        using System.Text;
        using System.Windows.Forms;
        using System.Drawing.Printing;

        namespace GECKO_FORMS
        {
            public partial class Form1 : Form
            {
                Bitmap bitmap;
                Bitmap memoryImage;
                public Form1()
                {
                    InitializeComponent();
                    Gecko.Xpcom.Initialize(@"D:\\xulrunner\bin\\");
                }              
                private void cmdbrowse_Click(object sender, EventArgs e)
                {
                    try
                    {
                        if (browse.IsBusy == false)
                        {
                            browse.Navigate(textBox1.Text);
                        }
                        else
                        {
                            lbox.Items.Add(browse.StatusText);
                            lbox.Items.Add(browse.History);
                        }               
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }

                private void cmdstop_Click(object sender, EventArgs e)
                {
                    browse.Stop();
                }

                                                                private void browse_ProgressChanged(object sender, Gecko.GeckoProgressEventArgs e)
{
    lbox.Items.Add(e.CurrentProgress + " of " + e.MaximumProgress);
}
                                                                                                                                private void CaptureScreen()
{
    Graphics myGraphics = this.CreateGraphics();
    Size s = this.Size;
    memoryImage = new Bitmap(s.Width, s.Height, myGraphics);
    Graphics memoryGraphics = Graphics.FromImage(memoryImage);
    memoryGraphics.CopyFromScreen(this.Location.X, this.Location.Y, 0, 0, s);
}

                                                                                                                                                                                                                                                                                                                                                                                                                                private void cmdprint_Click(object sender, EventArgs e)
{
    try
    {
        CaptureScreen();
        pDoc.Print();
        ////Add a Panel control.
        //Panel panel = new Panel();
        //this.Controls.Add(panel);
        ////Create a Bitmap of size same as that of the Form.
        //Graphics grp = panel.CreateGraphics();
        //Size formSize = this.ClientSize;
        //bitmap = new Bitmap(formSize.Width, formSize.Height, grp);
        //grp = Graphics.FromImage(bitmap);

        ////Copy screen area that that the Panel covers.
        //Point panelLocation = PointToScreen(panel.Location);
        //grp.CopyFromScreen(panelLocation.X, panelLocation.Y, 0, 0, formSize);

        ////Show the Print Preview Dialog.
        //ppd.Document = pDoc;
        //ppd.PrintPreviewControl.Zoom = 1;
        //ppd.ShowDialog();
    }
    catch (Exception ex)
    {
    }
}        

                                                                private void pDoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    e.Graphics.DrawImage(bitmap, 0, 0);
}
            }
        }

Here is output:

来源：https://stackoverflow.com/questions/38539328/how-to-configure-gecko-with-vb-net-forms-application

标签

vb.net

winforms

firefox

gecko

xulrunner