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(PureBasic) MIME Body vs. Sub-PartsExplains the difference between sub-parts and body. MIME documents (i.e. messages) can have a nested structure. The simplest MIME message contains a header followed by content (possibly encoded). The header is delimited from the content by two consecutive CRLF's.
A MIME message may be multipart. If so, then the Content-Type header field indicates "multipart" and the content the follows the header is itself a MIME message, which may also be multipart, etc. You can see how MIME messages effectively have a tree structure. The non-leaf nodes have Content-Types that are "multipart/
The Chilkat MIME component/library uses two terms that need to be understood in order to effectively use the API. These are "body" and "sub-part". A multipart node has 1 or more sub-parts, but its body is empty. A leaf node (i.e. non-multipart node) has no sub-parts, but the body is (usually) non-empty.
This example creates a multipart MIME message and shows the results of getting the sub-parts and body of each node. Note: This example requires Chilkat v11.0.0 or greater.
IncludeFile "CkMime.pb" Procedure ChilkatExample() success.i = 0 ; This example assumes the Chilkat API to have been previously unlocked. ; See Global Unlock Sample for sample code. mime.i = CkMime::ckCreate() If mime.i = 0 Debug "Failed to create object." ProcedureReturn EndIf ; Create a multipart/mixed MIME message with two sub-parts. ; We'll use the Base64 encoding for the 2nd sub-part. part1.i = CkMime::ckCreate() If part1.i = 0 Debug "Failed to create object." ProcedureReturn EndIf success = CkMime::ckSetBodyFromPlainText(part1,"This is part 1") part2.i = CkMime::ckCreate() If part2.i = 0 Debug "Failed to create object." ProcedureReturn EndIf success = CkMime::ckSetBodyFromPlainText(part2,"This is part 2") CkMime::setCkEncoding(part2, "base64") success = CkMime::ckNewMultipartMixed(mime) CkMime::setCkUseMmDescription(mime, 0) success = CkMime::ckAppendPart(mime,part1) success = CkMime::ckAppendPart(mime,part2) ; Show the MIME message: Debug CkMime::ckGetMime(mime) ; Here's the MIME: ; Content-Type: multipart/mixed; ; boundary="------------040605030407000302060008" ; ; --------------040605030407000302060008 ; Content-Type: text/plain; ; charset="us-ascii" ; Content-Transfer-Encoding: 7bit ; ; This is part 1 ; --------------040605030407000302060008 ; Content-Type: text/plain; ; charset="us-ascii" ; Content-Transfer-Encoding: base64 ; ; VGhpcyBpcyBwYXJ0IDI= ; ; --------------040605030407000302060008-- ; If we examine the root node of the MIME message, ; we see that it has 2 sub-parts and the body is empty (as expected) n.i = CkMime::ckNumParts(mime) Debug "Num Parts = " + Str(n) Debug "Body = " + CkMime::ckGetBodyDecoded(mime) ; The GetEntireBody retrieves the entire content after ; the header. (Perhaps GetEntireBody should've been named ; GetEntireContent to make it less confusing...) Debug "---- EntireBody:" Debug CkMime::ckGetEntireBody(mime) Debug "********" ; Now examine the 2nd sub-part. It has a body encoded ; using base64. Get the contents of the body in both ; decoded and encoded forms: ; index 0 is the 1st part, index 1 is the 2nd part. part.i = CkMime::ckCreate() If part.i = 0 Debug "Failed to create object." ProcedureReturn EndIf CkMime::ckPartAt(mime,1,part) Debug "Decoded Body:" Debug CkMime::ckGetBodyDecoded(part) Debug "Encoded Body:" Debug CkMime::ckGetBodyEncoded(part) CkMime::ckDispose(mime) CkMime::ckDispose(part1) CkMime::ckDispose(part2) CkMime::ckDispose(part) ProcedureReturn EndProcedure |
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