Posted: January 15 2006 at 6:37am | IP Logged

Hi all,

I'm coding in .NET 2005.

I have some problem by using the method "ExportImage" with the

Stream objet. I have used a MemoryStream in my code by the method "ExportImage" throw a exception.

Somebody can tell me how to use properly the method "ExportImage" in a Stream objet ?

Thank you very much,

Yves Teissier.

Posted: January 16 2006 at 9:29am | IP Logged

We use ADODB.Stream object because it provides a standard IStream interface. In theory the ExportImage can take any Stream object. If you are programming in C++, you may refer to http://www.morovia.com/support/article.aspx?id=10027.

For more information about passing optional parameter in C#, see kb article http://support.microsoft.com/?kbid=305814.

The most convenient way is to use in a scripting language such as VBScript. The V3.2 comes with an IIS sample written in VBScript:

 ' The Stream object is available in MDAC 2.5 and above versions. You can download the most
 ' recent MDAC at http://www.microsoft.com/data/mdac/
 Set objStream = Server.CreateObject("ADODB.Stream")
 objStream.Open
 objStream.Type = adTypeBinary

 ' Export the Image to Stream object.
 ' After transfer completes, the Position must set to 0 before Calling Response.BinaryWrite
 ' otherwise an "unknown type" is reported.
 objBarcode.ExportImage objStream, 1
 objStream.Position = 0
 
 ' BinaryWrite the image data to the client browser 
 Response.BinaryWrite objStream.Read