Using LibRTMP in VB or C# application

[Elgero]

Hello, I'm trying to use LibRTMP in my VB application, but I can't get it to work. No matter what rtmp stream I use, it always fails to connect (RTMP_Connect). Using RTMPDump with the same rtmp stream works fine.

Does anybody have any idea what's wrong?

In the immediate window I always get either this message:

Parsing...
Parsed protocol: 0
Parsed host    : rtmp.website.com
Parsed app     : play
Problem accessing the DNS. (addr: rtmp.website.com)

or this message:

Parsing...
Parsed protocol: 0
Parsed host    : rtmp.website.com
Parsed app     : play
RTMP_Connect0, failed to create socket. Error: 10093

This is my form code.

Imports System.Runtime.InteropServices
Imports System.IO

Public Class Form1

    Private m_LogCallback As New LibRTMP.LogCallback(AddressOf LogCallback)

    Private Sub LogCallback(ByVal level As LibRTMP.LogLevel, ByVal message As String)
        Debug.Print(message)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim b(1023) As Byte
        Dim bytes_read As Integer
        Dim r As IntPtr

        LibRTMP.RTMP_LogSetLevel(LibRTMP.LogLevel.ALL)
        LibRTMP.SetLogCallback(m_LogCallback)

        r = LibRTMP.RTMP_Alloc

        If r = IntPtr.Zero Then
            MessageBox.Show("failed rtmp_alloc")
            Return
        End If

        LibRTMP.RTMP_Init(r)

        LibRTMP.RTMP_SetupURL(r, Marshal.StringToHGlobalAnsi("rtmp://whatever-stream.com"))

        '// Always fails to connect here
        If LibRTMP.RTMP_Connect(r, IntPtr.Zero) = 0 Then
            MessageBox.Show("failed to establish RTMP connection")
            Return
        End If

        If LibRTMP.RTMP_ConnectStream(r, 0) = 0 Then
            MessageBox.Show("failed to establish RTMP session")
            Return
        End If

        Using FS As New FileStream("C:\teststream.flv", FileMode.Create, FileAccess.Write)
            Do
                bytes_read = LibRTMP.RTMP_Read(r, b, b.Length)
                If (bytes_read = 0) Then Exit Do
                FS.Write(b, 0, bytes_read)
            Loop
        End Using

        LibRTMP.RTMP_Close(r)
        LibRTMP.RTMP_Free(r)
    End Sub
End Class

This is my LibRTMP class.

Imports System.Runtime.InteropServices

Public Class LibRTMP

    Public Enum LogLevel
        CRIT = 0
        [ERROR]
        WARNING
        INFO
        DEBUG
        DEBUG2
        ALL
    End Enum

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_LibVersion() As Integer
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_Alloc() As IntPtr
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub RTMP_Free(ByVal rtmp As IntPtr)
    End Sub

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub RTMP_Init(ByVal rtmp As IntPtr)
    End Sub

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub RTMP_Close(ByVal rtmp As IntPtr)
    End Sub

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub RTMP_EnableWrite(ByVal rtmp As IntPtr)
    End Sub

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_SetupURL(ByVal rtmp As IntPtr, ByVal url As IntPtr) As Integer
    End Function
    'Intptr, because memory must remain valid so use StringToHGlobalAnsi

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub RTMP_LogSetLevel(ByVal lvl As Integer)
    End Sub

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_Connect(ByVal rtmp As IntPtr, ByVal cp As IntPtr) As Integer
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_ConnectStream(ByVal rtmp As IntPtr, ByVal seekTime As Integer) As Integer
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_Read(ByVal rtmp As IntPtr, ByVal buffer() As Byte, ByVal size As Integer) As Integer
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_Pause(ByVal rtmp As IntPtr, ByVal DoPause As Integer) As Integer
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_IsConnected(ByVal rtmp As IntPtr) As Boolean
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_IsTimedout(ByVal rtmp As IntPtr) As Boolean
    End Function

    <DllImport("librtmp.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function RTMP_HashSWF(ByVal url As String, <System.Runtime.InteropServices.Out()> ByRef size As Integer, ByVal hash() As Byte, ByVal age As Integer) As Boolean
    End Function

    <DllImport("logstub.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Function InitSockets() As Integer
    End Function

    <DllImport("logstub.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub CleanupSockets()
    End Sub

    <DllImport("logstub.dll", CallingConvention:=CallingConvention.Cdecl)>
    Public Shared Sub SetLogCallback(ByVal cb As LogCallback)
    End Sub

    Public Delegate Sub LogCallback(ByVal level As LogLevel, ByVal message As String)
End Class