Unicode C

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkMimeW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMimeW mime;
    HCkMimeW htmlPart;

    success = FALSE;

    mime = CkMimeW_Create();
    success = CkMimeW_LoadMimeFile(mime,L"qa_data/message.eml");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        return;
    }

    //  Wrap the current entity in a new outer multipart/alternative entity.  The original entity
    //  becomes the first child, ready for an alternate representation to be added.
    success = CkMimeW_ConvertToMultipartAlt(mime);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        return;
    }

    //  Add an alternative representation of the same content.
    htmlPart = CkMimeW_Create();
    success = CkMimeW_SetBodyFromHtml(htmlPart,L"<html><body>HTML alternative.</body></html>");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(htmlPart));
        CkMimeW_Dispose(mime);
        CkMimeW_Dispose(htmlPart);
        return;
    }

    success = CkMimeW_AppendPart(mime,htmlPart);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        CkMimeW_Dispose(htmlPart);
        return;
    }

    wprintf(L"Number of parts: %d\n",CkMimeW_getNumParts(mime));


    CkMimeW_Dispose(mime);
    CkMimeW_Dispose(htmlPart);

    }