write fetched mime section

Hi

How to "insert" back the retrived section of a MIME.

I first retrive the mime message part
char* resultText;
size_t result_len = 0;

r = 
mailmessage_fetch_section(entireMail,entireMime,&resultText,&result_len); 
//and I get the right part

Then I try to write this part back into entireMime structure
/// I tried with this

mailmime* submime; // is apointer to submime of entireMime structure

data = submime->mm_body; //mailmime_data
mailmime_data_free(data); //free previous empty data

data = mailmime_data_new(nType, nTextEncoding,
                                     nTextEncoded, resultText, result_len,
                                     resutl_text); // create new 
retrived data

But it doesn't work.

r = mailmime_write(file, &col,eni);

 What am I doing wrong or better what is the right way to do it right ??

Tnx
By,
Marko


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