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Function : Mail Gateway
MailAddHeaderItemByHandle - Adds a header item to an open message.

#include <mailserv.h>
STATUS LNPUBLIC MailAddHeaderItemByHandle(

    DHANDLE  hMessage,
    WORD  ItemCode,
    DHANDLE  hValue,
    WORD  ValueLength,
    WORD  ItemFlags);
Description :

This function adds a header item to an open message. Use this function to add items if your program has a handle to the item value. If your program has a pointer to the item value, use MailAddHeaderItem.

Unlock the handle to the item value before calling this function. This function transfers the memory specified by the handle to the message. If the function returns successfully, do not free this memory.

Use MailAddHeaderItemByHandle if your program has a handle to the item value, particularly text lists created with ListAllocate. Use ListAllocate and ListAddEntry to initialize the list. Unlock but do not free the list. Add the list to the message by calling MailAddHeaderItemByHandle. MailAddHeaderItemByHandle adds the list to the message efficiently because it transfers ownership of the memory specified by the handle to the message. It does not allocate additional memory for the item value, nor does it copy the item value. Therefore, if MailAddHeaderItemByHandle succeeds, do not free the memory specified by the handle.

This function always sets the ITEM_SUMMARY item flag, allowing the item to be used in views and formulas. However, if the value length is greater than 8KB, NSF clears the ITEM_SUMMARY flag.

Parameters : Input : hMessage - Open message handle.

ItemCode - Item code; all of the MAIL_xxx_ITEM_NUM item codes are valid.

hValue - Item value handle.

ValueLength - Item value length.

ItemFlags - Optional NSF item flags (ITEM_SIGN, ITEM_SEAL).

Output : (routine) - Return status from the call -- indicates either success (NOERROR) or what the error is.

Sample Usage :

    if (error = ListAllocate(0, 0, TRUE, &hToItem, &ToItem, &ToItemSize))
        goto Close;

    for (/* each SendTo name */)
        error = ListAddEntry(hToItem, TRUE, &ToItemSize, ToEntries, Value, 

    if (error = MailAddHeaderItemByHandle(hMessage, MAIL_SENDTO_ITEM_NUM, 
hToItem, ToItemSize, 0))
        goto Close;
    hToItem = NULLHANDLE;
See Also : ListAddEntry ListAllocate MailAddHeaderItem MAIL_xxx_ITEM_NUM(1) MAIL_xxx_ITEM_NUM(2)