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(Visual FoxPro) 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

LOCAL lnSuccess
LOCAL loMime

*  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.

loMime = CreateObject('Chilkat_9_5_0.Mime')

*  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:
loMime.ContentType = "text/plain"
loMime.Charset = "utf-8"

*  The Content-Type header field contains this:
*      Content-Type: text/plain; charset=utf-8
? loMime.GetEntireHead()
? "-"

loMime.SetHeaderField("Content-Type",'image/jpeg; name="kitty.jpg"')
*  The Content-Type header field now contains this:
*      Content-Type: image/jpeg; name="kitty.jpg"
? loMime.GetEntireHead()
? "-"

*  Notice how the properties have been updated:
? "ContentType property: " + loMime.ContentType
? "Charset property: " + loMime.Charset
? "Name property: " + loMime.Name
? "-"

*  To change a particular attribute value, set the property.
loMime.Name = "doggy.jpg"
? loMime.GetEntireHead()
? "-"

*  To remove an attribute value from the Content-Type header,
*  set the property to an empty string.
loMime.Name = ""
? loMime.GetEntireHead()
? "-"

RELEASE loMime


 

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