SAS 从文本文件插入观察结果，不完整读取

Question

有一个包含以下行的文本文件 邮件文本 = '/9j/4AAQSkZJRgABAQEAkACQAAD/4QBaRXhpZgAATU0AKgAAAAgABQMBAAUAAAABAAAASgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAFERAAQAAAABAAAOwlESAAQAAAABAAAOwgAAAAAAAYagAACxj//bAEMAAgEBAgEBAgICAgICAgIDBQMDAwMDBgQEAwUHBgcHBwY H'；输出；

如果我读了这一行，那么文本就会被中继，它看起来像这样的文本 /9j/4AAQSkZJRgABAQEAkACQAAD/4QBaRXhpZgAATU0AKgAAAAgABQMBAAUAAAABAAAASgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAFERAAQAAAABAAAOWLS AAQAAAABAAAOwgAAAAAAAYagAACxj//bAEMAAgEBAgEBAgICAgICAgIDBQMDAwMDBgQEAwUHBgchHBwYH

Mailtext = 'AND';输出;被忽略。

%let work_path=.. base64.txt;
/*
    content of base64.txt file 1 Line:
    Mailtext = '/9j/4AAQSkZJRgABAQEAkACQAAD/4QBaRXhpZgAATU0AKgAAAAgABQMBAAUAAAABAAAASgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAFERAAQAAAABAAAOwlESAAQAAAABAAAOwgAAAAAAAYagAACxj//bAEMAAgEBAgEBAgICAgICAgIDBQMDAwMDBgQEAwUHBgcHBwYH';output;
*/
%macro read;
    %let filrf  = myImage;
    %let rc=%sysfunc(filename(filrf, &work_path.));
    %let fid=%sysfunc(fopen(&filrf));  

    %if &fid > 0 %then

     %do %while(%sysfunc(fread(&fid))=0);                                                                                                  
        %let rc=%sysfunc(fget(&fid, c));                                                                                                
        &c.                                                                                                                       
     %end; 

    %let rc=%sysfunc(fclose(&fid)); 
%mend read;
%macro mail;

    Data Mail;
        attrib  MAILTEXT LENGTH=$256;
        keep Mailtext;

             /* other macros inserting observations */    

            %read

        /* other macros inserting observations */ 
    ruN;


%mend;
%mail

不知道要设置哪些选项才能读取和插入孔线

Answer 1

mailtext.txt 中直接有 SAS 代码指定输出语句吗？我会跳过所有这些，并调整它以直接使用数据步骤读取它，而不是使用宏函数。

data mail;
    length mailtext $256.;
    infile ".../base64.txt";
    input mailtext;

    mailtext = dequote(scan(mailtext, 1, ';'));
run;

mailtext
/9j/4AAQSkZJRgABAQEAkACQAAD/4QBaRXhpZgAATU0AKgAAAAgABQMBAAUAAAABAAAASgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAFERAAQAAAABAAAOwlESAAQAAAABAAAOwgAAAAAAAYagAACxj//bAEMAAgEBAgEBAgICAgICAgIDBQMDAwMDBgQEAwUHBgcHBwYH