Io 错误的输入流

我试图将一些参数传递到一个新函数中，该函数向平面文件中添加一列。电话是这样的：

(add-col-to-ff '(:absolute "home" "lambda" "Documents") "test-col-col"
               '(:absolute "home" "lambda" "Documents") "test-col-ff"     
               '(:absolute "home" "lambda" "Documents") "test-col-new.txt") 

但是SLIME返回了错误：

#<SB-SYS:FD-STREAM for "file /home/lambda/Documents/test-col-new.txt" 
{B50D7E1}> is not a character input stream.
[Condition of type SIMPLE-TYPE-ERROR]
Backtrace:
  0: (SB-KERNEL:ILL-IN #<SB-SYS:FD-STREAM for "file /home/lambda/Documents/test-    
     col-new.txt" {B50D7E1}>)

---

您可以为输出打开一个流。但是，然后您尝试使用

读取行

从该输出流中读取。这当然不起作用。

根据公认的答案，我将

do

宏替换为

dotimes

，如下所示：

(defun add-col-to-ff (col-dir col-file 
                      ff-dir ff-file 
                      out-dir out-file)
  (let ((M (make-ff-array ff-dir ff-file))
        (vec (vec-from-1col-ff col-dir col-file))
        (path (make-pathname :name out-file 
                             :directory out-dir)))
    (with-open-file (addcol-str path :direction :output)
      (dotimes (i (array-dimension M 0)) 
          (dotimes (k (array-dimension M 1))
            (cond ((eql (1+ k) (array-dimension M 0))
                   (format addcol-str "~A ~A~%" (aref M i k) (svref vec k)))
                  ((and (eql (1+ i) (array-dimension M 0)) 
                        (eql (1+ k) (array-dimension M 1)))
                   (format addcol-str "~A ~A"  (aref M i k) (svref vec k)))
                  (t (format addcol-str "~A " (aref M i k))))))))) 

---

很有魅力。

哦，当然。我不需要像在输出中那样遍历这些行。我刚完成一个输入foo。我将发布正确的函数。

(defun add-col-to-ff (col-dir col-file 
                      ff-dir ff-file 
                      out-dir out-file)
  (let ((M (make-ff-array ff-dir ff-file))
        (vec (vec-from-1col-ff col-dir col-file))
        (path (make-pathname :name out-file 
                             :directory out-dir)))
    (with-open-file (addcol-str path :direction :output)
      (dotimes (i (array-dimension M 0)) 
          (dotimes (k (array-dimension M 1))
            (cond ((eql (1+ k) (array-dimension M 0))
                   (format addcol-str "~A ~A~%" (aref M i k) (svref vec k)))
                  ((and (eql (1+ i) (array-dimension M 0)) 
                        (eql (1+ k) (array-dimension M 1)))
                   (format addcol-str "~A ~A"  (aref M i k) (svref vec k)))
                  (t (format addcol-str "~A " (aref M i k)))))))))