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microsoft.public.dotnet.framework.aspnet.webservices

read/write binary file

Stephen Richardson

8/12/2003 9:50:00 AM

I'm writing a web service which will return a string
containing the contents of a binary file (converted using
System.Convert.ToBase64String). When I pass the string to
a second web service to write the file I get an exception
error "Invalid character in Base64 string" when I try to
use System.Convert.FromBase64String. Any ideas why this
happens or suggestions about other ways to write this (I
thought about using DIME attachments) would be appreciated.
3 Answers

Erymuzuan Mustapa

8/12/2003 10:03:00 AM

0

doing the conversiot , you are running the risk of certain characters has no
XML representation, that's why you getting the error on your client, my
suggestion would be to use DIME / WS-attachment, it's alot easier to develop
and configure and it's designed for this kind of purpose

--
Erymuzuan Mustapa
Inter Virtual Sdn. Bhd.
See MIND at http://www.M...

"Stephen Richardson" <srichardson@mazak.co.uk> wrote in message
news:0c4301c360b7$14af2490$a301280a@phx.gbl...
> I'm writing a web service which will return a string
> containing the contents of a binary file (converted using
> System.Convert.ToBase64String). When I pass the string to
> a second web service to write the file I get an exception
> error "Invalid character in Base64 string" when I try to
> use System.Convert.FromBase64String. Any ideas why this
> happens or suggestions about other ways to write this (I
> thought about using DIME attachments) would be appreciated.
>

Arthur Nesterovsky

8/12/2003 11:35:00 AM

0

Hi,

> I've got it working now but I would like to know if anyone
> has a sample app which uses DIME attachments.

Visit my page and read/download SCCBridge project.
There are samples (sources on C#) how to send and receive
DIME on the both client- and server-side.
______________________________
With best wishes, Arthur Nesterovsky
Please visit my home page:
http://www.nesterovsk...

yhhuang

8/13/2003 6:57:00 AM

0

Hello Stephen,

Thanks for posting in the group.

I suggest you read the article "Sending Files, Attachments, and SOAP Messages Via Direct Internet Message
Encapsulation" at http://msdn.microsoft.com/msdnmag/issues/02/12/DIME/de.... In this article, the author explains
what DIME is and how it differs from MIME encapsulation. A detailed description of the message format and how it is parsed,
as well as working with SOAP and extending it with WSDL, is also included.

"Understanding DIME and WS-Attachments"
http://msdn.microsoft.com/webservices/building/wse/default.aspx?pull=/library/en-us/dnwebsrv/html/dimew...

For samples, you could refer to http://www.codeproject.com/cs/webservices/dimewebcam.asp?t....

Hope that helps.

Best regards,
Yanhong Huang
Microsoft Online Partner Support

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!I've got it working now but I would like to know if anyone
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!
!>-----Original Message-----
!>I'm writing a web service which will return a string
!>containing the contents of a binary file (converted using
!>System.Convert.ToBase64String). When I pass the string to
!>a second web service to write the file I get an exception
!>error "Invalid character in Base64 string" when I try to
!>use System.Convert.FromBase64String. Any ideas why this
!>happens or suggestions about other ways to write this (I
!>thought about using DIME attachments) would be
!appreciated.
!>
!>.
!>
!