Addition to https://nocin.eu/abap-e-mail-templates-in-s-4hana/
I had to create an E-Mail template where I did not need a CDS view or any variable at all. I simply needed the defined mail template without any rendering of class cl_smtg_email_api.
Solution: Reading the plain mail template can be achieved using class cl_smtg_email_template and method get_tmpl_cont:
DATA(ls_mail_content) = cl_smtg_email_template=>get( p_mailtx )->get_tmpl_cont( iv_langu = 'D' ).
Full sample:
PARAMETERS: p_mailtx TYPE smtg_tmpl_id OBLIGATORY.
TRY.
" get mail template
DATA(ls_mail_content) = cl_smtg_email_template=>get( p_mailtx )->get_tmpl_cont( iv_langu = 'D' ).
" optional: dynamic manipulation of html email body
" create mail document
DATA(lo_mail_document) = cl_document_bcs=>create_document( i_type = 'HTM'
i_subject = conv #( ls_mail_content-subject )
i_text = cl_bcs_convert=>string_to_soli( ls_mail_content-body_html ) ).
" create Sender & Receiver
DATA(lo_sender) = cl_cam_address_bcs=>create_internet_address( i_address_string = 'noreply@example.com'
i_address_name = 'Test' ).
DATA(lo_recipient) = cl_cam_address_bcs=>create_internet_address( i_address_string = 'max.mustermann@example.com').
" create Business Communication Service
DATA(lo_bcs) = cl_bcs=>create_persistent( ).
lo_bcs->set_document( lo_mail_document ).
lo_bcs->set_sender( lo_sender ).
lo_bcs->add_recipient( lo_recipient ).
lo_bcs->send( ).
COMMIT WORK.
CATCH cx_smtg_email_common INTO DATA(ls_cx).
DATA(lv_message) = ls_cx->get_text( ).
MESSAGE e899(id) WITH 'Unable to send message:'(004) lv_message.
ENDTRY.