create_mime_message_part_from_file.c

#define _GNU_SOURCE
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "../src/cmime_message.h"
 
void usage() {
    printf("\n");
    printf("libcmime - simple api demonstration\n");
    printf("-----------------------------------\n");
    printf("demonstrates: manual creation of new CMimeMessage_T mime message. Furthermore the message is manually extended by an attachment\n");
    printf("output: output is written to stdout if no output file is specified (-f /path/to/out_file.txt)\n");
    printf("\n");
}
 
 
int main(int argc, char *argv[]) {
 
    // addresses can either be specified "just as an address" or like "John Doe <from@example.org>"
    char from[] = "from@example.org";
    char to[] = "to@example.org";
    char *file = NULL;
    char *out = NULL;
    char *msgid = NULL;
    char *attachment = NULL;
    int option;
    int retval = 0;
 
   // check command line parameters
    while((option = getopt(argc,argv,"hf:a:")) != EOF) {
        switch(option) {
            case 'f':
                asprintf(&file, "%s", optarg);
                break; 
            case 'a':
                asprintf(&attachment, "%s", optarg);
                break;
            case 'h':
                usage();
                break; 
            default:
                usage();
        }
    }
 
    if(attachment != NULL) {
 
        CMimeMessage_T *message = cmime_message_new();
        CMimePart_T *part = cmime_part_new();
        CMimeListElem_T *elem = NULL;
        CMimePart_T *prev = NULL;
        
        // set the sender of the message
        cmime_message_set_sender(message,from);
 
        // add an recipient, this can also be done with cmime_message_add_recipient_to
        cmime_message_add_recipient(message, to, CMIME_ADDRESS_TYPE_TO);
 
        // set subject
        cmime_message_set_subject(message, "This is an exmaple");
 
        // generate date header
        cmime_message_set_date_now(message);
 
        // generate a message id and add it to our message
        msgid = cmime_message_generate_boundary();
        cmime_message_set_message_id(message, msgid);
    
        // add content to the body
        cmime_message_set_body(message,"This is the message body");
 
        // add the attachment
        /* check if there is a previous part */
        if (message->parts->size >= 1) {
            elem = cmime_list_tail(message->parts);
            prev = cmime_list_data(elem);
            prev->last = 0;
        }
        cmime_message_add_generated_boundary(message);
        cmime_part_from_file(&part, attachment,message->linebreak);
        part->parent_boundary = strdup(message->boundary);
        part->last = 1;
        cmime_list_append(message->parts,part);
 
        // assign the email to out or write it to file (depending on cli options)
        if(file != NULL) {
            if(cmime_message_to_file(message,file) > 0) {
                printf("file created: %s\n", file);
            } else {
                printf("error writing file: %s\n", file);
            }
        } else {
            out = cmime_message_to_string(message);
            printf("%s\n", out);
        }
    
        // free the initialized object
        cmime_message_free(message);
    } else {
        printf("you have to specify an attachment with -a\n");
        retval = -1;
    }
 
    // some clean up
    if(out != NULL)
        free(out);
    if(msgid != NULL)
        free(msgid);
    if(file != NULL)
        free(file);
    if(attachment != NULL)
        free(attachment);
    
 
    return retval;
}