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(DataFlex) The MIME Content-Type Header Field

Explains the ContentType property and the Content-Type header field including the various attributes that may be included.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoMime
    String sTemp1

    //  Every part in a MIME messsage should include a Content-Type header field.
    //  The Content-Type indicates the type of content contained in the MIME part.
    //  For example: text/plain, image/jpeg, application/pdf, application/json, multipart/mixed, etc.

    //  Multipart content types are those where the MIME part's body is composed of N inner MIME messages,
    //  separated by a boundary string.
    //  This is how MIME gets a nested, tree-like structure.  The most common multipart MIME types
    //  are (for email related MIME) multipart/mixed, multipart/alternative, and multipart/related,
    //  and for HTTP related MIME, it is multipart/form-data.

    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End

    //  The Content-Type header field can be set or modified in two ways.
    //  1) By setting the ContentType, Micalg, Name, Charset, Boundary, or Protocol properties.
    //     Setting the ContentType property sets the primary value (such as "text/plain") of the header field.
    //     Each of the other properties listed above will replace or add a particular attribute value.

    //  2) By setting the entire contents of the ContentType header with the SetHeaderField method.
    //     This updates each of the Content-Type related properties.

    //  For example:
    Set ComContentType Of hoMime To "text/plain"
    Set ComCharset Of hoMime To "utf-8"

    //  The Content-Type header field contains this:
    //      Content-Type: text/plain; charset=utf-8
    Get ComGetEntireHead Of hoMime To sTemp1
    Showln sTemp1
    Showln "-"

    Get ComSetHeaderField Of hoMime "Content-Type" 'image/jpeg; name="kitty.jpg"' To iSuccess
    //  The Content-Type header field now contains this:
    //      Content-Type: image/jpeg; name="kitty.jpg"
    Get ComGetEntireHead Of hoMime To sTemp1
    Showln sTemp1
    Showln "-"

    //  Notice how the properties have been updated:
    Get ComContentType Of hoMime To sTemp1
    Showln "ContentType property: " sTemp1
    Get ComCharset Of hoMime To sTemp1
    Showln "Charset property: " sTemp1
    Get ComName Of hoMime To sTemp1
    Showln "Name property: " sTemp1
    Showln "-"

    //  To change a particular attribute value, set the property.
    Set ComName Of hoMime To "doggy.jpg"
    Get ComGetEntireHead Of hoMime To sTemp1
    Showln sTemp1
    Showln "-"

    //  To remove an attribute value from the Content-Type header,
    //  set the property to an empty string.
    Set ComName Of hoMime To ""
    Get ComGetEntireHead Of hoMime To sTemp1
    Showln sTemp1
    Showln "-"


End_Procedure

 

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