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Join Date: Apr 2008

Posts: 114

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ninjaimp

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Parameter is no valid

Apr 7th, 2009

Hi

Im trying to display image binary data but its not working.
I have the code below but on the line:

newimage = System.Drawing.Image.FromStream(ms)

i keep getting the error 'Parameter is not valid'

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
        Dim obj As Byte()
        obj = StringToByteArray(ImageString)
 
        Dim ms As New MemoryStream(obj)
        Dim newimage As System.Drawing.Image
 
        newimage = System.Drawing.Image.FromStream(ms)
 
        Response.ContentType = "image/jpeg"
        newimage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)
        Dim obj As Byte()
        obj = StringToByteArray(ImageString)

        Dim ms As New MemoryStream(obj)
        Dim newimage As System.Drawing.Image

        newimage = System.Drawing.Image.FromStream(ms)

        Response.ContentType = "image/jpeg"
        newimage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)

Last edited by peter_budo; Apr 8th, 2009 at 8:09 pm. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks) and [icode] (inline code) tags.

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Join Date: Aug 2008

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dickersonka dickersonka is offline

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Re: Parameter is no valid

Apr 7th, 2009

try specifying the size of the memory stream, are you also sure stringtobytearray is doing what it should?

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
Dim ms As New MemoryStream(obj, 0, obj.Length)
Dim ms As New MemoryStream(obj, 0, obj.Length)

Last edited by dickersonka; Apr 7th, 2009 at 10:55 am.

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Join Date: Apr 2008

Posts: 114

Reputation: ninjaimp is an unknown quantity at this point

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ninjaimp

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Re: Parameter is no valid

Apr 7th, 2009

the function is below:

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
 
  Public Shared Function StringToByteArray(ByVal input As String) As Byte()
        Return Encoding.Unicode.GetBytes(String.Empty + input)
    End Function
  Public Shared Function StringToByteArray(ByVal input As String) As Byte()
        Return Encoding.Unicode.GetBytes(String.Empty + input)
    End Function

the rest of my code is slightly different also, building in your thoughts of defining the size of the stream and it is still the same error!

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
obj = StringToByteArray(ImageString)
        Dim ms As New MemoryStream(obj)
        ms.Write(obj, 0, obj.Length)
 
        ms.Position = 0
        Dim newimage As New System.Drawing.Bitmap(ms)
 
        Response.ContentType = "image/jpeg"
        newimage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)
obj = StringToByteArray(ImageString)
        Dim ms As New MemoryStream(obj)
        ms.Write(obj, 0, obj.Length)

        ms.Position = 0
        Dim newimage As New System.Drawing.Bitmap(ms)

        Response.ContentType = "image/jpeg"
        newimage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)

thanks

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Re: Parameter is no valid

Apr 7th, 2009

try this then, c# but i'm sure you can convert it to vb

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
 ImageConverter imageConverter = new System.Drawing.ImageConverter();
Image image = imageConverter.ConvertFrom(obj) as Image;
 ImageConverter imageConverter = new System.Drawing.ImageConverter();
Image image = imageConverter.ConvertFrom(obj) as Image;

if that doesn't work, i'm wondering if its an encoding issue

try swapping out your string to byte array with this

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
Public Shared Function StringToByteArray(intput As String) As Byte()
   Dim encoding As New System.Text.ASCIIEncoding()
   Return encoding.GetBytes(input)
End Function
Public Shared Function StringToByteArray(intput As String) As Byte()
   Dim encoding As New System.Text.ASCIIEncoding()
   Return encoding.GetBytes(input)
End Function

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Join Date: Apr 2008

Posts: 114

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ninjaimp

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Re: Parameter is no valid

Apr 7th, 2009

still giving the same error

i think it could be becuase the image binary information im importing is wrong/duff - its from a dump of an postgreSQL table image field.

I have started another thread trying to find out how to chekc if it is valid here http://www.daniweb.com/forums/thread185639.html

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Re: Parameter is no valid

Apr 7th, 2009

try to save the byte array to a file rather than image first, and see if you can open that file up properly

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
'Get our byte array
obj = StringToByteArray(ImageString)
 
'Save to a file
Dim oFileStream As System.IO.FileStream
 oFileStream = New System.IO.FileStream("image.jpg", System.IO.FileMode.Create)
 oFileStream.Write(obj, 0, obj.Length)
oFileStream.Close()
'Get our byte array
obj = StringToByteArray(ImageString)

'Save to a file
Dim oFileStream As System.IO.FileStream
 oFileStream = New System.IO.FileStream("image.jpg", System.IO.FileMode.Create)
 oFileStream.Write(obj, 0, obj.Length)
oFileStream.Close()

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Join Date: Apr 2008

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ninjaimp

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Re: Parameter is no valid

Apr 7th, 2009

it saved the image but when trying to view it in windows picture viewer it sqays 'no preview available'

Could it just be that the binary info im pulling in is duff - can it be checked in any way?

Your help is greatly appreciated on this by the way

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Join Date: Aug 2008

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Re: Parameter is no valid

Apr 7th, 2009

this here in your file, shows that it is supposed to be a jpeg
\\377\\330\\377\\340

here's a c# sample to check a stream
http://stackoverflow.com/questions/2...from-file-in-c

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Join Date: Apr 2008

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ninjaimp

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Re: Parameter is no valid

Apr 7th, 2009

it is/was a jpeg - ill give that page a look now - many thanks

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ninjaimp

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Re: Parameter is no valid

#10

Apr 7th, 2009

im afraid im getting a little bit lost with this....

The binary data, as i see it and as it is stored in the export file does not contain any header info but i would like to compare it to another images binary data but everytime i export binary data out of an sql express table it only has the value system byte[] -

do you know how to retrive the actual value so i can use it for testing?

many thanks