Function Module: GUI_DOWNLOAD
注： 如需要导出 UTF-8 的文件，可使用以下格式即可。
call function 'GUI_DOWNLOAD'
exporting
filename = p_file
FILETYPE = 'DAT'
CODEPAGE = '4110'
WRITE_BOM = 'X'
如是使用open dataset 方式输出 UTF-8，则可用认下方式。
open dataset gv_file for output in text mode encoding UTF-8 WITH BYTE-ORDER MARK WITH SMART LINEFEED
对FUNCTION: GUI_DOWNLOAD中某些参数的用法.
call function 'GUI_DOWNLOAD'
exporting
* BIN_FILESIZE =
* filename = p_file
* FILETYPE = 'DAT'
* APPEND = ' '
* write_field_separator = 'X'
* HEADER = '00'
* TRUNC_TRAILING_BLANKS = ' '
* WRITE_LF = 'X'
* COL_SELECT = ' '
* COL_SELECT_MASK = ' '
* DAT_MODE = ' '
* CONFIRM_OVERWRITE = ' '
* NO_AUTH_CHECK = ' '
* CODEPAGE = '4103'
* IGNORE_CERR = ABAP_TRUE
* REPLACEMENT = '#'
* WRITE_BOM = 'X'
* TRUNC_TRAILING_BLANKS_EOL = 'X'
* WK1_N_FORMAT = ' '
* WK1_N_SIZE = ' '
* WK1_T_FORMAT = ' '
* WK1_T_SIZE = ' '
* WRITE_LF_AFTER_LAST_LINE = ABAP_TRUE
* SHOW_TRANSFER_STATUS = ABAP_TRUE
* IMPORTING
* FILELENGTH =
* tables
* data_tab = it_kna1
* fieldnames = it_filedname[]
* EXCEPTIONS
* FILE_WRITE_ERROR = 1
* NO_BATCH = 2
* GUI_REFUSE_FILETRANSFER = 3
* INVALID_TYPE = 4
* NO_AUTHORITY = 5
* UNKNOWN_ERROR = 6
* HEADER_NOT_ALLOWED = 7
* SEPARATOR_NOT_ALLOWED = 8
* FILESIZE_NOT_ALLOWED = 9
* HEADER_TOO_LONG = 10
* DP_ERROR_CREATE = 11
* DP_ERROR_SEND = 12
* DP_ERROR_WRITE = 13
* UNKNOWN_DP_ERROR = 14
* ACCESS_DENIED = 15
* DP_OUT_OF_MEMORY = 16
* DISK_FULL = 17
* DP_TIMEOUT = 18
* FILE_NOT_FOUND = 19
* DATAPROVIDER_EXCEPTION = 20
* CONTROL_FLUSH_ERROR = 21
* OTHERS = 22.
1. FILETYPE: GUI_DOWNLOAD FILETYPE
'ASC' :
ASCII format. The table is transferred as text. Conversion exits are performed. The output format additionally depends on the parameters CODEPAGE, TRUNC_TRAILING_BLANKS, and TRUNC_TRAILING_BLANKS_EOL.
'IBM' :
ASCII format with IBM codepage conversion (DOS). This format corresponds to the 'ASC' format when using target codepage 1103. This codepage is frequently used for data exchange via floppy disk.
'DAT' :
Column-by-column transfer. With this format, the data is transferred as text as with ASC. However, no conversion exits are performed and the columns are separated by tab characters. This format generates files than can be uploaded again using gui_upload or ws_upload.
'DBF' :
Data is downloaded in dBase format. Since in this format the data types of the individual columns are stored as well, you can often avoid import problems, for example, into Microsoft Excel, especially when interpreting numeric values.
'WK1' :
Data is downloaded in Lotus 1-2-3 format.
'BIN' :
Binary format. Data is transferred binarily. There is no formatting and no codepage conversion. The data is interpreted row by row; it is not formatted by columns. Specify the data length in parameter BIN_FILESIZE. The table should consist of a column of type X, because especially in Unicode systems, the conversion of structured into binary data causes errors.
Default
'ASC'
2. APPEND
GUI_DOWNLOAD APPEND
By default, existing local files are overwritten by new versions. By setting APPEND to 'X', the downloaded data is appended to an existing file. If the file does not yet exist, it is created.
Value range
'X' = Data is appended.
SPACE = Data is overwritten if the file already exists.
Default
SPACE
3. WRITE_FIELD_SEPARATOR
GUI_DOWNLOAD WRITE_FIELD_SEPARATOR
In the downloaded file, the columns are separated by tab characters (cl_abap_char_utilities=>horizontal_tab). You should use this setting if you want to upload the data from the file at a later time, because this is the only way of identifying individual columns.
The parameter makes sense only for the FILETYPE values ASC, DAT and IBM; for DAT it is set implicitly.
Value range
'X' : Write separator.
SPACE : Do not write separator.
Default
SPACE
4. WRITE_LF
GUI_DOWNLOAD WRITE_LF
If this parameter is set, at the end of each row a row separator is inserted by CL_ABAP_CHAR_UTILITIES=>CR_LF. This parameter makes sense only for FILETYPE 'ASC', 'DAT' and 'IBM'. If this parameter is not set, blanks at the end of a row are not removed.
Value range
'X': Row separator is inserted.
SPACE: Row separator is not inserted.
Default
'X'
5. DAT_MODE
GUI_DOWNLOAD DAT_MODE
If parameter DAT_MODE is set, the file is stored in 'DAT' format. No conversion exits are performed. Number and date fields are stored in a standard format which makes it possible, to later import the file using gui_upload.
Value range
'X': DAT_MODE is switched on.
SPACE: DAT_MODE is not switched on.
Default
SPACE
6. CODEPAGE
GUI_DOWNLOAD CODEPAGE
Use parameter CODEPAGE to specify the desired target codepage. If this parameter is not set, the codepage of the SAP GUI is used as the target codepage.
Value range
4-digit number of the SAP codepage. The function module SCP_CODEPAGE_BY_EXTERNAL_NAME returns the SAP codepage number for an external character set name, for example, "iso-8859-1". The function module NLS_GET_FRONTEND_CP returns the appropriate non-Unicode frontend codepage for a language.
You can determine the desired codepage interactively, if the parameter with_encoding of method file_save_dialog is set by cl_gui_frontend_services.
SPACE: Codepage of the SAP GUI
Default
SPACE
7. REPLACEMENT
GUI_DOWNLOAD REPLACEMENT
Specifies the replacement character to be used when during a character set conversion a character cannot be converted.
Value range
An individual character.
Default
'#'
8. WRITE_BOM
GUI_DOWNLOAD WRITE_BOM
If the data is written in a Unicode codepage, at the beginning of the file the respective byte order mark (BOM) is inserted.
Unicode - Little Endian Codepage 4103, binary values 'FFFE'
Unicode - Big Endian Codepage 4102, binary values 'FEFF'
UTF-8 Codepage 4110, binary values 'EFBBBF'
Note: Microsoft Excel only supports Unicode data if they have been written in the format Unicode - Little Endian.
Value range
'X': Write BOM.
SPACE: Do not write BOM.
Default
SPACE
9. FIELDNAMES
GUI_DOWNLOAD FIELDNAMES
Optional table with column names for the individual columns.
- 'DBF': The column names are entered into the structure definition of the DBF file.
- 'DAT': An additional row with the column names is inserted at the beginning of the table.