[RESOLVED] Webbrowser control does not load HTML if passed as command line parameter

[mobi12]

I have created a simple form with a web browser control.

In the web browser control, I am loading TinyMCE editor .html file.

No problem, working fine as expected. I can open any HTML file and edit.

However, problem starts when I try to pass an html file using command line parameter mode.

It works BUT only when I insert a MessageBox comment before loading the file.

    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        wb.Dock = DockStyle.Fill
        Dim URL As String
        wb.ScriptErrorsSuppressed = True
        Dim AppPath As String = System.AppDomain.CurrentDomain.BaseDirectory()
        AppPath = AppPath.Replace(":", "$")
        URL = "\\127.0.0.1\" & AppPath & "tinymce.html"
        wb.Navigate(URL)

        'Handle command line arguments - if supplied
        Dim CmdArg As String() = Environment.GetCommandLineArgs()
        Dim NoOfArgument As Integer = CmdArg.Count
        Select Case NoOfArgument
            Case 1 'No argument supplied
                'Do nothing
            Case 2 'only filename supplied
                Dim x As String = Path.GetExtension(CmdArg(1).ToString).ToLower
                If (x = ".html" Or x = ".htm") Then
                    Dim html As Object = File.ReadAllText(CmdArg(1).ToString)
                    MessageBox.Show(CmdArg(1).ToString, "Loading via command line") 'not working without this!
                    wb.Document.InvokeScript("SetContent", New Object() {html})
                End If
            Case Else
                MessageBox.Show("Invalid argument or file" & vbCrLf & "No action taken.", "Argument error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Select
    End Sub

As you can see in the code, without messagebox line, the form just opens without file loaded in the web browser.
My WebBrowser control is named as wb

I have tried to introduced a forced pause using sleep timer but that did not help.

[jmcilhinney]

Try loading it in the Shown event handler instead of the Load event handler.

[mobi12]

Same result, still works only with messagebox

I also tried with with storing command line argument in a variable and using it in the Form_Shown event but without any luck.

Interesting part is, if I do not use TinyMCE's script in web browser and simply use vanila web browser control in design mode, then it works fine (even in Form Load event). The puzzle is why web browser is behaving differently if I load the tinymce editor.

    Private Sub Form1_Shown(sender As Object, e As System.EventArgs) Handles Me.Shown
        'Handle command line arguments - if supplied
        Dim CmdArg As String() = Environment.GetCommandLineArgs()
        Dim NoOfArgument As Integer = CmdArg.Count
        Select Case NoOfArgument
            Case 1 'No argument supplied
                'Do nothing
            Case 2 'only filename supplied
                Dim x As String = Path.GetExtension(CmdArg(1).ToString).ToLower
                If (x = ".html" Or x = ".htm") Then
                    CurrentlySelectedFile = CmdArg(1).ToString
                    Dim html As Object = File.ReadAllText(CurrentlySelectedFile)
                    MessageBox.Show(CurrentlySelectedFile, "Loading via command line") 'not working without this!
                    wb.Document.InvokeScript("SetContent", New Object() {html})
                    lblStatus.Text = CurrentlySelectedFile
                End If
            Case Else
                MessageBox.Show("Invalid argument or file" & vbCrLf & "No action taken.", "Argument error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Select
    End Sub

[mobi12]

Managed to resolve it. Had to introduce a pause manually like this.

Dim html As Object = File.ReadAllText(CurrentlySelectedFile)
Threading.Thread.Sleep(1000) 'not loading html without a pause
Application.DoEvents()
wb.Document.InvokeScript("SetContent", New Object() {html})

Interesting that when I tried with only sleep timer it did not work, but both sleep and application.doevents did the trick.

[jmcilhinney]

Try using the DocumentCompleted event of the WebBrowser. You'd have to add some conditional logic so that it only happened the first time.