CL_GUI_FRONTEND_SERVICES Documentation

Question

Does anyone knows where I can find documentation for this class?

Answer 1

In Rel 6.20 is following (Patch-Level 48):
CL CL_GUI_FRONTEND_SERVICES
Text
Frontend Services
Functionality
The class CL_GUI_FRONTEND_SERVICES contains static methods for the following areas:
File functions
Directory functions
Registry
Environment
Write to / read from clipboard
Upload / download files
Execute programs / open documents
Query functions, such as Windows directory, Windows version, and so on
Standard dialogs (open, save, directory selection)
Example
Determine the temp directory on your PC:
DATA: TEMP_DIR TYPE STRING.
CALL METHOD CL_GUI_FRONTEND_SERVICES=>GET_TEMP_DIRECTORY
CHANGING
TEMP_DIR = TEMP_DIR
EXCEPTIONS
CNTL_ERROR = 1
ERROR_NO_GUI = 2.
IF SY-SUBRC <> 0.
Error handling
ENDIF.
flush to send previous call to frontend
CALL METHOD CL_GUI_CFW=>FLUSH
EXCEPTIONS
CNTL_SYSTEM_ERROR = 1
CNTL_ERROR = 2
OTHERS = 3.
IF SY-SUBRC <> 0.
Error handling
ENDIF.
WRITE:  /  'Temporary directory is:', TEMP_DIR.
Notes
The class CL_GUI_FRONTEND_SERVICES is based on the Control Framework. See the documentation for more information, in particular on CL_GUI_CFW=>FLUSH which must be called after many CL_GUI_FRONTEND_SERVICES methods.
Migration Information
The old file transfer model was based on function modules of the function group GRAP. The old features have been replaced by the class CL_GUI_FRONTEND_SERVICES. The following list contains the old function modules (italic) and the new methods (bold) that replace them:
CLPB_EXPORT
CLIPBOARD_EXPORT
CLPB_IMPORT
CLIPBOARD_IMPORT
DOWNLOAD
GUI_DOWNLOAD, dialog replaced by FILE_SAVE_DIALOG
PROFILE_GET
No replacement, use REGISTRY_* methods instead
PROFILE_SET
No replacement, use REGISTRY_* methods instead
REGISTRY_GET
REGISTRY_GET_VALUE, REGISTRY_GET_DWORD_VALUE
REGISTRY_SET
REGISTRY_SET_VALUE, REGISTRY_SET_DWORD_VALUE
UPLOAD
GUI_UPLOAD, dialog replaced by FILE_OPEN_DIALOG
WS_DDE
Obsolete: This function is no longer supported.
SET_DOWNLOAD_AUTHORITY
Obsolete: This function is no longer supported.
WS_DOWNLOAD
GUI_DOWNLOAD
WS_DOWNLOAD_WAN
Obsolete: This function is no longer supported.
WS_EXCEL
Obsolete: This function is no longer supported.
WS_EXECUTE
EXECUTE
WS_FILENAME_GET
FILE_SAVE_DIALOG, FILE_OPEN_DIALOG
WS_FILE_ATTRIB
FILE_SET_ATTRIBUTES, FILE_GET_ATTRIBUTES
WS_FILE_COPY
FILE_COPY
WS_FILE_DELETE
FILE_DELETE
WS_MSG
Obsolete: This function is no longer supported.
WS_QUERY
CD (current directory)
DIRECTORY_GET_CURRENT
EN (read/write environment)
ENVIRONMENT_GET_VARIABLE
ENVIRONMENT_SET_VARIABLE
FL (determine file length)
FILE_GET_SIZE
FE (check if file exists)
FILE_EXIST
DE (check if directory exists)
DIRECTORY_EXIST
WS (determine Windows system)
GET_PLATFORM
OS (operating system)
GET_PLATFORM
WS_UPLDL_PATH
Obsolete: This function is no longer supported.
WS_UPLOAD
GUI_UPLOAD
WS_VOLUME_GET
Obsolete: This function is no longer supported.
Not too much, but a bit...