How to CORRECTLY process errors , catch exceptions, generate messages.

[Former Member]

Hello,

As my programs miss this functionality (error processing , catch exceptions , generate messages) I would like to learn how to correctly use these things.

Can somebody give me few examples:

a. what kind of messages should be generated if execution of FM has failed

b. raise and process exceptions

c. how to pick up the error.

Thanks

[Former Member]

a. what kind of messages should be generated if execution of FM has failed

Error messages/ Exceptions are generated if a FM has failed. For ex:

CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      filename                = l_flname
      filetype                = 'ASC'
      write_field_separator   = '#'
    TABLES
      data_tab                = it_excel_dwnld
    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

Above FM you can see the 22 exceptions which can arise while downloading a file is being failed.

b. raise and process exceptions

IF sy-subrc <> 0.
    FORMAT COLOR COL_NEGATIVE.
    CASE sy-subrc.
      WHEN 1.
        v_msg = file_write_error.
ENDCASE

Displays messages on screen.

how to pick up the error

You can double click on the error and diagonise.

[agnihotro_sinha2]

Hi,

If it is a REPORT program, and you want to generate ERROR messages,

collect all the Error message text in an Internal Table like below

      wa_bdcmsgtab-pernr    = p_summary-pernr.
      "Employee Name
      wa_bdcmsgtab-empname  = p_summary-empname.
      "Employee Personnel Subarea
      wa_bdcmsgtab-psub     = p_summary-psub.
      "Get message text
      wa_bdcmsgtab-msg      = 'No data for BDC upload'(r29).
      "Build BDC Message table
      APPEND wa_bdcmsgtab TO it_bdcmsgtab.

then display the Internal table as an ALV pop-up or as an REPORT Output.

A single message can be displayed using MESSAGE statement like below:

lets say you hv to handle FM error messages:

then use

  case sy-subrc.
  when '0'.
    MESSAGE i003 WITH 'Error in displaying top-of-page'(i01).
  when '1'.
       MESSAGE i003 WITH 'Error in displaying header''(i01).
  endcase.

ags.

Edited by: ags on May 5, 2010 4:20 PM

[Former Member]

Suggest search in articles, etc., for "class-based exception handling". It's discussed in newer ABAP manuals, such as ABAP Objects and Official ABAP Programming Guidelines as well as others.

[agnihotro_sinha2]

for CLASS based Exception handling:

data OREF type ref to CX_ROOT. "For exception handling
TRY .
            modify zht_dbtab FROM TABLE it_dbtab.
          CATCH cx_sy_open_sql_db INTO oref.
            IF sy-subrc NE 0.
              ROLLBACK WORK.
            ENDIF.
        ENDTRY.

Use IF_MESSAGE~GET_TEXT method of Oref to get text of the ERROR message

ags.