[2005] File IO Problem

In VB6 you could do something like this

Code:

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Public Class MapRec

        Public Name As String
        Public Moral As Byte
        Public Up As Long
        Public Down As Long
        Public Left As Long
        Public right As Long
        Public Music As String
        Public BootMap As Long
        Public BootX As Byte
        Public BootY As Byte
        Public Shop As Long
        Public Indoors As Byte
        Public Tile(0 To Max_mapwidth, 0 To Max_mapheight) As TileRec
        Public Npc(0 To MAX_MAP_NPCS) As Long
        Public Owner As String
        Public Weather As Long
        Public lights As Long

        Public Sub New()
            Name = ""
            Moral = 0
            Up = -1
            Down = -1
            Left = -1
            right = -1
            Music = -1
            BootMap = -1
            BootX = 0
            BootY = 0
            Shop = -1
            Indoors = 0
            Owner = ""
            Weather = -1
            lights = -1
        End Sub

    End Class

Module MapData

 Public Map(0 To MAX_MAPS) As MapRec

    Sub SaveLocalMap(ByVal MapNum As Long)
        Dim FileName As String
        Dim f As Long

        FileName = Application.StartupPath & "\maps\map" & MapNum & ".dat"

        f = FreeFile()
        FileOpen(f, FileName, OpenMode.Binary)
        FilePutObject(f, Map(MapNum))
        FileClose(f)
    End Sub

    Sub LoadMap(ByVal MapNum As Long)
        Dim FileName As String
        Dim f As Long

        FileName = Application.StartupPath & "\maps\map" & MapNum & ".dat"

        If FileExist("maps\map" & MapNum & ".dat") = False Then Exit Sub
        f = FreeFile()
        FileOpen(f, FileName, OpenMode.Binary)
        FileGetObject(f, Map(MapNum))
        FileClose(f)
    End Sub

End Module

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But this gives me an error in .net, any idea how I can do this. Load a binary file directly to a class? I'll find the error if you guys need.

Please post the .NET code that you have, the error being generated and what line is causing it.

that is the .net code, it is the equilent of the vb6.

Code:

---


Public type MapRec

        Public Name As String
        Public Moral As Byte
        Public Up As Long
        Public Down As Long
        Public Left As Long
        Public right As Long
        Public Music As String
        Public BootMap As Long
        Public BootX As Byte
        Public BootY As Byte
        Public Shop As Long
        Public Indoors As Byte
        Public Tile(0 To Max_mapwidth, 0 To Max_mapheight) As TileRec
        Public Npc(0 To MAX_MAP_NPCS) As Long
        Public Owner As String
        Public Weather As Long
        Public lights As Long

    End type

Module MapData

 Public Map(0 To MAX_MAPS) As MapRec


Sub SaveLocalMap(ByVal MapNum As Long)
Dim FileName As String
Dim f As Long

    FileName = App.Path & "\maps\map" & MapNum & ".dat"
                           
    f = FreeFile
    Open FileName For Binary As #f
        Put #f, , Map(MapNum)
    Close #f
End Sub

Sub LoadMap(ByVal MapNum As Long)
Dim FileName As String
Dim f As Long

    FileName = App.Path & "\maps\map" & MapNum & ".dat"
       
    If FileExist("maps\map" & MapNum & ".dat") = False Then Exit Sub
    f = FreeFile
    Open FileName For Binary As #f
        Get #f, , Map(MapNum)
    Close #f
End Sub

---

Ok, but what is the error and what line is causing it?

Error: Variable uses an Automation type not supported in Visual Basic.
Sub: LoadMap(ByVal MapNum As Long)
Line: FileGetObject(f, Map(MapNum))

That is not VB.NET code at all. It is VB 6. Are you using VB 6 or VB.NET?

the first post is vb.net code.

Oops, ok, but its still using allot of VB 6 code in it.

Do you really need the argument as a Long? In .NET a Integer is now what a VB 6 Long was.

Also Freefile and Basic File I/O should not be used, its VB 6 code.

Use the System.IO class instead.

how would i do it using System.IO, i tried using the binary reader/writer but that didn't work.

What do you mean it didnt work? Post the code you were using and what the error message is.

Ohhh man i dont think i saved that code...uhhh let me get it together again...

i only did loadfile

Code:

---

    Sub LoadMap(ByVal MapNum As Integer)
        Dim FileName As String

        FileName = Application.StartupPath & "\maps\map" & MapNum & ".dat"

        If FileExist(FileName) = False Then Exit Sub

        Dim Stream As New IO.FileStream(FileName, IO.FileMode.Open)
        Dim Reader As New IO.BinaryReader(Stream, System.Text.Encoding.Unicode)
    *  Map(MapNum) = Reader.ReadBytes(Stream.Length) *

    End Sub

---

I get an error saying cannot convert 1 dimensional array of bytes to maprec


i have also tried

Code:

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Map(MapNum) = Reader.Read

---

but that dont work either

Code:

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If System.IO.File.Exist(FileName) = False Then Exit Sub

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thats not the line i have the error on but ya, thats true. Its hard converting 10,000 lines of code from vb6 to .net so there are some things like that.

Well I just want to start from the code execution on down. So the next line will be ....

Code:

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Map(MapNum) = Reader.ReadBytes(Stream.Length)

---

So to convert this, its basically just a class with some variables. Seems like you are trying to read a file and populate the class at the same time?

exactly, i'm trying to read the file straight into the class, and vise-versa for the savelocalmap method.

I read around the internet about this and I think i have it, i should use serialization with my classes.

Code:

---

    Sub LoadMap(ByVal MapNum As Integer)
        Dim FileName As String

        FileName = Application.StartupPath & "\maps\map" & MapNum & ".dat"

        If FileExist(FileName) = False Then Exit Sub

        Dim input As IO.FileStream
        Dim reader As Runtime.Serialization.Formatters.Binary.BinaryFormatter = New Runtime.Serialization.Formatters.Binary.BinaryFormatter()

        input = New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read)

        Try
            Map(MapNum) = CType(reader.Deserialize(input), MapRec)
        Catch serializableException As Runtime.Serialization.SerializationException
            input.Close()

        End Try

        input.Close()

    End Sub

---

thats my code now, but im getting an error, let me bring it up again...just a sec...

The input stream is not a valid binary format. The starting contents (in bytes) are: 20-20-20-20-20-20-20-20-20-20-20-20-20-20-20-20-20 ...

for line

Code:

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Map(MapNum) = CType(reader.Deserialize(input), MapRec)

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