Blobs in Base64

The following functions get and set a Blob file content in Base64:

• ToBase64String(): Returns Blob file content in Base64.
• FromBase64String(): Loads the content in Base64 received by parameter into the Blob file.

These functions may be used as follows:

ContentBase64 = <att | var>.ToBase64String()

<att | var>.FromBase64String(ContentBase64)

ContentBase64 contains the Base64 content and could be a LongVarChar, for instance.

So far, when a Web Service with a returning Blob parameter is called, the returned value will be the Blob's file content in Base64.

ContentBase64 = WebServiceBlob.Execute()

Sample

This is an example showing how to transfer a file in Base64 format using the File data type and Blob data type:

&File.Source = !"c:\temp\xpz\1.gif"

if &File.Exists()
 // Emulate sender
 &Blob = &File.GetAbsoluteName()
 &Content64 = &Blob.ToBase64String()
 msg(format(!"Base64 %1", &Content64),nowait)
 
 // Emulate receiver
 &File2.source = !"c:\temp\xpz\1a.gif"
 If not &File2.Exists()
  &File2.Create()
 EndIf

 &File2.FromBase64String(&Content64) // to another file
 &File2.Close()
 
 msg(format(!"Result in %1", &File2.GetAbsoluteName()),nowait)
else    
 msg(format(!"%1 does not exist", &File.Source),nowait)
endif

See Also

Blob data type