(MFC) MIME Content-Disposition Header Field

Explains the Content-Disposition header field and the properties used for setting or updating.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkMime.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // The Content-Disposition header field provides a suggestion to the receiver for how the content is to be processed.
    // The standard dispositions are "inline" and "attachment".  

    // A disposition of "attachment" indicates the content is something to be saved to a file and not processed (such as rendering for viewing inline).
    // A disposition of "inline" indicates the content should be processed (displayed) inline with the other parts of the MIME message.

    // For example, an email client could handle a JPG image based on the disposition.  If the disposition is "attachment",
    // the email client (such as Thunderbird, GMail, or Outlook) might simply list the JPG image as one of the email's attachments,
    // but won't display the JPG image.  If the disposition is "inline", the email client might display the JPG image, but not list
    // it as an attachment.

    // The Content-Disposition header field can also include a "filename" attribute.  This is the suggested default filename if the content
    // is to be saved to a file.

    bool success;
    CkMime mime;

    // The Content-Disposition header field can be set or modified in two ways.
    // 1) By setting the Disposition and Filename properties.

    // 2) By setting the entire contents of the Content-Disposition header with the SetHeaderField method.
    //    Setting the Content-Disposition header automatically updates the Disposition and Filename properties.

    // For example:
    mime.put_Disposition("attachment");
    mime.put_Filename("ghost.jpg");

    // The Content-Disposition header field contains this:
    //     Content-Disposition: attachment; filename="ghost.jpg"
    strOut.append(mime.getEntireHead());
    strOut.append("\r\n");
    strOut.append("-");
    strOut.append("\r\n");

    // If we set the entire header field..
    mime.SetHeaderField("Content-Disposition","attachment; filename=\"zombie.jpg\"");
    // The Content-Disposition header field now contains this:
    //     Content-Disposition: attachment; filename="zombie.jpg"
    strOut.append(mime.getEntireHead());
    strOut.append("\r\n");
    strOut.append("-");
    strOut.append("\r\n");

    // Notice how the Filename property has been updated
    strOut.append("Filename property: ");
    strOut.append(mime.filename());
    strOut.append("\r\n");
    strOut.append("-");
    strOut.append("\r\n");

    // To change a particular attribute value, set the property.
    mime.put_Filename("skeleton.jpg");
    strOut.append(mime.getEntireHead());
    strOut.append("\r\n");
    strOut.append("-");
    strOut.append("\r\n");

    // To remove the filename from the Content-Disposition header,
    // set the property to an empty string.
    mime.put_Filename("");
    strOut.append(mime.getEntireHead());
    strOut.append("\r\n");
    strOut.append("-");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }