How to add a document into AX programmically (Document handling)

As a matter of fact it's pretty easy. Following lines allow you do this.

void saveIntoDocuRefTable()
{
        DocuValue docuValue;
        DocuRef docuRef;
        Container cFile;

        BinData binData;
        DocuTypeId _docuTypeId = ...;
        ;

        binData = new BinData();
        binData.loadFile(fileName);

        cFile = Docu::splitFileName(fileName);
        docuValue.fileName = conpeek(cFile,1);
        docuValue.path = conpeek(cFile,3);
        docuValue.fileType = conpeek(cFile,2);
        docuValue.File = binData.getData();
        docuValue.insert();

        docuRef.ValueRecId = docuValue.recId;
        docuRef.RefCompanyId = CurExt();
        docuRef.RefTableId = tableNum(....);
        docuRef.RefRecId = .....;
        docuRef.TypeId = _docuTypeId;
        docuRef.Name = fileName;
        docuRef.Notes = ....;
        docuRef.insert();

        WinApi::deleteFile(fileName);
}