(MFC) Convert Embedded HTML Images to Multipart/Related CID References

Demonstrates how to convert HTML images that are inline/embedded within the HTML to CID references to multipart/related MIME parts.

Note: This example requires Chilkat v9.5.0.78 or greater.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkEmail.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example converts the following email with image data embedded directly in the HTML,
    // to the MIME shown at the bottom of this page.
    // If the HTML contains multiple embedded images, the call to email.ConvertInlineImages will convert all of them.

    // MIME-Version: 1.0
    // Date: Tue, 30 Apr 2019 11:36:34 +0200
    // Message-ID: <E5DB5F8A65D671FB4822B22F5309411838F2FC93@PC0VDL0W013>
    // Content-Type: text/html; charset="windows-1252"
    // Content-Transfer-Encoding: quoted-printable
    // X-Priority: 3 (Normal)
    // From: <admin@chilkatsoft.com>
    // To: Matt <matt@chilkat.io>
    // Subject: Test
    // 
    // <html xmlns=3D"http://www.w3.org/1999/xhtml">
    // <body><p>
    // <img src=3D"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAAD/2=
    // wBDAAIBAQEBAQIBAQECAgICAgQDAgICAgUEBAMEBgUGBgYFBgYGBwkIBgcJBwYGCAsICQoKCgoK=
    // BggLDAsKDAkKCgr/2wBDAQICAgICAgUDAwUKBwYHCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo=
    // ...
    // 4zzS3ww+5/8AyR//2Q=3D=3D" width=3D"58" height=3D"66" alt=3D"" style=3D"bord=
    // er-width:0px;" /></body>
    // </html>

    CkEmail email;
    bool success = email.LoadEml("qa_data/eml/embedded_html_image.eml");

    email.ConvertInlineImages();
    strOut.append(email.getMime());
    strOut.append("\r\n");

    // The MIME after moving the image data to a separate MIME sub-part:

    // MIME-Version: 1.0
    // Date: Tue, 30 Apr 2019 11:36:34 +0200
    // Message-ID: <E5DB5F8A65D671FB4822B22F5309411838F2FC93@PC0VDL0W013>
    // Content-Type: multipart/related; boundary="------------020808080005060904000806"
    // X-Priority: 3 (Normal)
    // From: <admin@chilkatsoft.com>
    // To: Matt <matt@chilkat.io>
    // Subject: Test
    // 
    // --------------020808080005060904000806
    // Content-Type: text/html; charset=windows-1252
    // Content-Transfer-Encoding: quoted-printable
    // 
    // <html xmlns=3D"http://www.w3.org/1999/xhtml">
    // </head></head><body><p>
    // <img src=3D"cid:CID-1f73052c-32a7-4abb-8e9d-0afb58c17eed@CHILKATSLICE" widt=
    // h=3D"58" height=3D"66" alt=3D"" style=3D"border-width:0px;" /></body>
    // </html>
    // 
    // 
    // 
    // --------------020808080005060904000806
    // Content-Type: image/jpeg; name="image_95EA3073134C.jpeg"
    // Content-Transfer-Encoding: base64
    // Content-ID: <CID-1f73052c-32a7-4abb-8e9d-0afb58c17eed@CHILKATSLICE>
    // 
    // /9j/4AAQSkZJRgABAQEA3ADcAAD/2wBDAAIBAQEBAQIBAQECAgICAgQDAgICAgUEBAMEBgUGBgYF
    // BgYGBwkIBgcJBwYGCAsICQoKCgoKBggLDAsKDAkKCgr/2wBDAQICAgICAgUDAwUKBwYHCgoKCgoK
    // ...
    // 5bmGF7e42pOwUxrFNEQOcLGw6vX2Yv7NfxbWLYfB67s84vrf/wCLoor8r424ZwGYZkqlSUk+VLRr
    // /Jn2mS8QYzC0Woxi9eqf+aGr+zX8XUyW8K9/+f8Ag/8AjlO/4Zs+Ln/Qqf8Ak/b/APxyiivkXwPl
    // H88/vj/8ifUR4zzS3ww+5/8AyR//2Q==
    // 
    // --------------020808080005060904000806--


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }