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(Go) 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.
success := false // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. mime := Mime_Ref.html">chilkat.NewMime() // Create a multipart/mixed MIME message with two sub-parts. // We'll use the Base64 encoding for the 2nd sub-part. part1 := Mime_Ref.html">chilkat.NewMime() success = part1.SetBodyFromPlainText("This is part 1") part2 := Mime_Ref.html">chilkat.NewMime() success = part2.SetBodyFromPlainText("This is part 2") part2.SetEncoding("base64") success = mime.NewMultipartMixed() mime.SetUseMmDescription(false) success = mime.AppendPart(part1) success = mime.AppendPart(part2) // Show the MIME message: fmt.Println(*mime.GetMime()) // 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 := mime.NumParts() fmt.Println("Num Parts = ", n) fmt.Println("Body = ", *mime.GetBodyDecoded()) // The GetEntireBody retrieves the entire content after // the header. (Perhaps GetEntireBody should've been named // GetEntireContent to make it less confusing...) fmt.Println("---- EntireBody:") fmt.Println(*mime.GetEntireBody()) fmt.Println("********") // 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 := Mime_Ref.html">chilkat.NewMime() mime.PartAt(1,part) fmt.Println("Decoded Body:") fmt.Println(*part.GetBodyDecoded()) fmt.Println("Encoded Body:") fmt.Println(*part.GetBodyEncoded()) mime.DisposeMime() part1.DisposeMime() part2.DisposeMime() part.DisposeMime() |
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