Image FromStream GDI+ Error with PictureBox

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Howdy All,

I have an object model that stores images for use in a graphics
application. Rather than reading the images and keeping them in memory,
which has a HUGE footprint, I instead read the file into an array of
bytes, convert the array of bytes into a memory stream, then use the
Image.FromStream method to create the image. When I am done with that
image, I dispose of the image object, but keep the memory stream open
so it is quick to access next time. This sort of works and has a much
smaller footprint. However, whenever I try to display the image in a
picture box, I get the following error:


A generic GDI+ error occurred.
Invalid parameter used.

System.ArgumentException: Invalid parameter used.
at System.Drawing.Image.get_Width()
at System.Drawing.Image.get_Size()
at System.Windows.Forms.PictureBox.get_ImageRectangle()
at System.Windows.Forms.PictureBox.OnPaint(PaintEventArgs pe)
at
System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e,
Int16 layer, Boolean disposeEventArgs)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32
msg, IntPtr wparam, IntPtr lparam)


The code that creates the memory stream and image from the stream is as
follows:

Public Sub LoadImageStream()
If m_ImageStream Is Nothing Then
If m_Path.Length > 0 AndAlso System.IO.File.Exists(m_Path) Then
SyncLock m_ImageLockObject
Dim fs As New System.IO.FileStream(m_Path, IO.FileMode.Open,
IO.FileAccess.Read, IO.FileShare.Read)
Dim arr(CInt(fs.Length - 1)) As Byte
fs.Read(arr, 0, CInt(fs.Length))
fs.Close()
m_ImageStream = New System.IO.MemoryStream(arr)
End SyncLock
End If
End If
End Sub

Public ReadOnly Property Image() As System.Drawing.Bitmap
Get
If m_ImageStream Is Nothing Then
LoadImageStream()
DisposeImage()
End If
If m_Image Is Nothing AndAlso Not m_ImageStream Is Nothing Then
m_Image = CType(System.Drawing.Bitmap.FromStream(m_ImageStream,
True), System.Drawing.Bitmap)
End If
Return m_Image
End Get
End Property


The image loads from the stream with no problem. But, when I try to
display the image in the picture box, I get the error.

I have seen tons of posts related to this. But, I have yet to find a
solution to the problem.

Does anyone have a solution, or is there some better method of caching
these images in memory?

Thanks,
Matthew Roberts

mroberts_hm<at>hotmail<dot>com
matthewroberts<at>srcp<dot>com

.

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