How to assemble PDF form pages into one file

In many cases, we need to assemble mutiple PDF form output into one PDF file.

In this case, you need to refer the the standard program FP_CHECK_BATCH_PDF_RETURN.

Simple, please do as following:

1. Call the function FP_JOB_OPEN, in the importing parameter, there is field named 'assemble', set it to be ABAP_TRUE. Please be noted that, when you set the value for it, there is constrain that you should set value for other fields under rule. Otherewise, there will be errro when calling the FP_JOB_OPEN

  fp_outputparams-nodialog   = abap_true.
  fp_outputparams-getpdf     = 'M'.
  fp_outputparams-assemble   = abap_true.
  fp_outputparams-preview   = abap_false.

2. Call the function modules of the the PDF forms(using the function   FP_FUNCTION_MODULE_NAME to get the function name) for as many times as you like.

3. Call the function module FP_JOB_CLOSE to close the process.

4. Call the function module   FP_GET_PDF_TABLE to get the output xstring of the PDF forms.

5. Using following code to open the PDF file from frontend.

  CALL METHOD CL_GUI_FRONTEND_SERVICES=>GET_TEMP_DIRECTORY
    CHANGING
      TEMP_DIR             = L_FILE
    EXCEPTIONS
      CNTL_ERROR           = 1
      ERROR_NO_GUI         = 2
      NOT_SUPPORTED_BY_GUI = 3
      OTHERS               = 4.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'E' NUMBER '256'.
  ENDIF.
  CALL METHOD CL_GUI_CFW=>FLUSH
    EXCEPTIONS
      CNTL_SYSTEM_ERROR = 1
      CNTL_ERROR        = 2
      OTHERS            = 3.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'E' NUMBER '256'.
  ENDIF.
  CALL METHOD CL_GUI_FRONTEND_SERVICES=>GET_FILE_SEPARATOR
    CHANGING
      FILE_SEPARATOR       = LV_SEP
    EXCEPTIONS
      CNTL_ERROR           = 1
      ERROR_NO_GUI         = 2
      NOT_SUPPORTED_BY_GUI = 3
      OTHERS               = 4.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'E' NUMBER '256'.
  ENDIF.
  CONCATENATE L_FILE LV_SEP SY-REPID C_FILE_EXT_PDF INTO L_FILE.
  CALL FUNCTION 'SCMS_XSTRING_TO_BINARY'
    EXPORTING
      BUFFER     = L_PDF_XSTRING
    TABLES
      BINARY_TAB = LT_DATA.
  L_LEN = XSTRLEN( L_RESULT-CONTENT ).
  CALL METHOD CL_GUI_FRONTEND_SERVICES=>GUI_DOWNLOAD
    EXPORTING
      BIN_FILESIZE            = L_LEN
      FILENAME                = L_FILE
      FILETYPE                = 'BIN'
    CHANGING
      DATA_TAB                = LT_DATA
    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
      NOT_SUPPORTED_BY_GUI    = 22
      ERROR_NO_GUI            = 23
      OTHERS                  = 24.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'E' NUMBER '256'.
  ENDIF.
  CALL METHOD CL_GUI_FRONTEND_SERVICES=>EXECUTE
    EXPORTING
      DOCUMENT               = L_FILE
      SYNCHRONOUS            = 'X'
    EXCEPTIONS
      CNTL_ERROR             = 1
      ERROR_NO_GUI           = 2
      BAD_PARAMETER          = 3
      FILE_NOT_FOUND         = 4
      PATH_NOT_FOUND         = 5
      FILE_EXTENSION_UNKNOWN = 6
      ERROR_EXECUTE_FAILED   = 7
      SYNCHRONOUS_FAILED     = 8
      NOT_SUPPORTED_BY_GUI   = 9
      OTHERS                 = 10.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'I' NUMBER '256'.
  ENDIF.
  CALL METHOD CL_GUI_FRONTEND_SERVICES=>FILE_DELETE
    EXPORTING
      FILENAME             = L_FILE
    CHANGING
      RC                   = L_RC
    EXCEPTIONS
      FILE_DELETE_FAILED   = 1
      CNTL_ERROR           = 2
      ERROR_NO_GUI         = 3
      FILE_NOT_FOUND       = 4
      ACCESS_DENIED        = 5
      UNKNOWN_ERROR        = 6
      NOT_SUPPORTED_BY_GUI = 7
      WRONG_PARAMETER      = 8
      OTHERS               = 9.
  IF SY-SUBRC IS NOT INITIAL.
    MESSAGE ID 'ED' TYPE 'E' NUMBER '256'.
  ENDIF.