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(Unicode C) The MIME Content-Type Header FieldExplains the ContentType property and the Content-Type header field including the various attributes that may be included.
#include <C_CkMimeW.h> void ChilkatSample(void) { BOOL success; HCkMimeW mime; // 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. mime = CkMimeW_Create(); // 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: CkMimeW_putContentType(mime,L"text/plain"); CkMimeW_putCharset(mime,L"utf-8"); // The Content-Type header field contains this: // Content-Type: text/plain; charset=utf-8 wprintf(L"%s\n",CkMimeW_getEntireHead(mime)); wprintf(L"-\n"); CkMimeW_SetHeaderField(mime,L"Content-Type",L"image/jpeg; name=\"kitty.jpg\""); // The Content-Type header field now contains this: // Content-Type: image/jpeg; name="kitty.jpg" wprintf(L"%s\n",CkMimeW_getEntireHead(mime)); wprintf(L"-\n"); // Notice how the properties have been updated: wprintf(L"ContentType property: %s\n",CkMimeW_contentType(mime)); wprintf(L"Charset property: %s\n",CkMimeW_charset(mime)); wprintf(L"Name property: %s\n",CkMimeW_name(mime)); wprintf(L"-\n"); // To change a particular attribute value, set the property. CkMimeW_putName(mime,L"doggy.jpg"); wprintf(L"%s\n",CkMimeW_getEntireHead(mime)); wprintf(L"-\n"); // To remove an attribute value from the Content-Type header, // set the property to an empty string. CkMimeW_putName(mime,L""); wprintf(L"%s\n",CkMimeW_getEntireHead(mime)); wprintf(L"-\n"); CkMimeW_Dispose(mime); } |
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