How to upload (.txt) file by using GUI Upload?

Question

I tried to upload .csv file in using GUI upload and it works.
THIS IS MY SAMPLE CODE.
CLEAR w_rawfile.
  DESCRIBE TABLE i_rawfile LINES v_read.     "Counter for records read
  Condense w_rawfile-field.
Separate header record from detail records
  LOOP AT i_rawfile INTO w_rawfile.
    IF sy-tabix = 1.           "header is always the first record
      SPLIT w_rawfile-field AT ' ' INTO
        w_header_file-name1
        w_header_file-name2
        w_header_file-name3
        w_header_file-cntry
        w_header_file-address1
        w_header_file-address2.
  APPEND w_header_file TO i_header_file.
      CLEAR: w_header_file.
    ELSE.            "succeeding records are detail records
      SPLIT w_rawfile-field AT ',' INTO
             w_inputfile-nachn
             w_inputfile-vorna
             w_inputfile-nach2
             w_inputfile-land1
             w_inputfile-stras
APPEND w_inputfile TO i_inputfile.
ENDIF.
IF i try to replace my file into a .txt format. An error occurs. Please kindly give me the code to do this correctlt. ThanX!

Answer 1

Reading Data from Presentation Server (Dialog)
To read data from the presentation server into an internal table with a user dialog, use the function module UPLOAD. The most important parameters are listed below. For more information, refer to the function module documentation in the Function Builder (Transaction SE37).
Important Import Parameters
Parameters
Function
CODEPAGE
Only for upload under DOS: Value IBM
FILENAME
Filename (default value for user dialog)
FILETYPE
File type (default value for user dialog)
ITEM
Title for dialog box
Use the FILETYPE parameter to specify the transfer mode. Possible values:
BIN
Binary files
ASC
ASCII files: Text files with end of line markers.
DAT
Excel files, saved as text files with columns separated by tabs and lines separated by line breaks.
WK1
Excel and Lotus files saved as WK1 spreadsheets.
Important Export Parameters
Parameters
Function
FILESIZE
Number of bytes transferred
ACT_FILENAME
Filename (as entered in the user dialog)
ACT_FILETYPE
File type (as entered in the user dialog)
Tables Parameters
Parameters
Function
DATA_TAB
Internal table (target for the import)
Exceptions Parameters
Parameters
Function
CONVERSION_ERROR
Error converting data
INVALID_TABLE_WIDTH
Invalid table structure
INVALID_TYPE
Incorrect FILETYPE parameter
Suppose the presentation server is running under Windows NT, and contains the following Excel file:
If this table is saved as a text file "D:\temp\mytable.txt" with tabs between the columns, the following program can read the table:
PROGRAM SAPMZTST.
DATA: FNAME(128), FTYPE(3), FSIZE TYPE I.
TYPES: BEGIN OF LINE,
         COL1(10) TYPE C,
         COL2(10) TYPE C,
         COL3(10) TYPE C,
       END OF LINE.
TYPES  ITAB TYPE LINE OCCURS 10.
DATA: LIN TYPE LINE,
      TAB TYPE ITAB.
CALL FUNCTION 'UPLOAD'
     EXPORTING
          CODEPAGE            = 'IBM'
          FILENAME            = 'd:\temp\mytable.txt'
          FILETYPE            = 'DAT'
          ITEM                = 'Read Test for Excel File'
     IMPORTING
          FILESIZE            =  FSIZE
          ACT_FILENAME        =  FNAME
          ACT_FILETYPE        =  FTYPE
     TABLES
          DATA_TAB            =  TAB
     EXCEPTIONS
          CONVERSION_ERROR    = 1
          INVALID_TABLE_WIDTH = 2
          INVALID_TYPE        = 3.
WRITE: 'SY-SUBRC:', SY-SUBRC,
     / 'Name    :', (60) FNAME,
     / 'Type    :', FTYPE,
     / 'Size    :', FSIZE.
SKIP.
LOOP AT TAB INTO LIN.
   WRITE: / LIN-COL1, LIN-COL2, LIN-COL3.
ENDLOOP.
The program displays the following dialog box:
Here, the user can change the default values. When the user chooses Transfer, the system imports the data from the file D:\temp\mytable.txt into the internal table TAB.
The output appears as follows:
SY-SUBRC: 0
Name : d:\temp\mytable.txt
Type : DAT
Size : 69
Billy the Kid
My Fair Lady
Herman the German
Conan the Barbarian
The contents of the internal table TAB are exactly the same as the contents of the original Excel table.