Xbase++

Enumerate MIME Header Field Names

Demonstrates the Chilkat Mime.GetHeaderFieldName method, which returns the name of the header-field occurrence at a zero-based index. The only argument is the index; use NumHeaderFields for the count. Original order and casing are preserved.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: When you need to walk all the headers — to display them, copy them, or handle duplicates that GetHeaderField would hide — index-based access is the way. NumHeaderFields bounds the loop, and this returns each field's name in its original order and casing, which matters when the exact header sequence is significant.

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LOCAL nSuccess
LOCAL oMime
LOCAL n
LOCAL i
LOCAL cFieldName

nSuccess := 0

oMime := CreateObject("Chilkat.Mime")
nSuccess := oMime:LoadMimeFile("qa_data/message.eml")
IF (nSuccess == 0)
    ? oMime:LastErrorText
    oMime:destroy()
    RETURN
ENDIF

//  Iterate the header fields by index.  NumHeaderFields gives the count; GetHeaderFieldName and
//  GetHeaderFieldValue return the name and value at each zero-based index.  Original order and
//  casing are preserved.
n := oMime:NumHeaderFields
? "Header fields: " + Str(n)

FOR i := 0 TO n - 1
    cFieldName := oMime:GetHeaderFieldName(i)
    IF (oMime:LastMethodSuccess == 0)
        ? oMime:LastErrorText
        oMime:destroy()
        RETURN
    ENDIF

    ? cFieldName
NEXT

oMime:destroy()