Zip file out of binary (xstring)

Question

Hi,
I try to compress (zip) binary data (for example a picture) and then give it to a html page. I use the cl_abap_gzip=>compress_binary method and it seems to work. But when I save the zip-file to harddisk over the popup at the html - page, the file could not be opened. WinZip says that it is an unvalid archive.
Can anybody help me?
Here my example coding at the OnInitialization Event of the business server page:
* event handler for data retrieval
* local variables
DATA: xsourcefile TYPE xstring.
DATA: xzippedfile TYPE xstring.
DATA: source_file_mime_type TYPE string.
DATA: xzippedcontentlength TYPE i, xzippedcontentlengthstring TYPE
string.
* References
DATA: o_mime_api TYPE REF TO if_mr_api.
* processing
* +++ Read File from MIME-Repository (binary) +++
CALL METHOD cl_mime_repository_api=>if_mr_api~get_api
  RECEIVING
    r_mr_api = o_mime_api.
CALL METHOD o_mime_api->get
  EXPORTING
    i_url              = 'SAP/ZGSD_SD_ADIS/test.gif'
*    I_CHECK_AUTHORITY  = 'X'
  IMPORTING
*    E_IS_FOLDER        =
    e_content          = xsourcefile
    e_mime_type        = source_file_mime_type
*    E_LOIO             =
*  CHANGING
*    C_LANGUAGE         =
  EXCEPTIONS
    parameter_missing  = 1
    error_occured      = 2
    not_found          = 3
    permission_failure = 4
    OTHERS             = 5
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* +++ create ZIP-File +++
TRY.
    CALL METHOD cl_abap_gzip=>compress_binary
      EXPORTING
        raw_in                     =  xsourcefile
*    RAW_IN_LEN                 = -1
*    COMPRESS_LEVEL             = 6
      IMPORTING
        gzip_out                   = xzippedfile
        gzip_out_len               = xzippedcontentlength.
* ... Länge Casten !
    xzippedcontentlengthstring = xzippedcontentlength.
* ... Errorhandling
  CATCH cx_parameter_invalid_range . " Error-Handling
  CATCH cx_sy_buffer_overflow . " Error-Handling
  CATCH cx_sy_compression_error . " Error-Handling
ENDTRY.
* +++ Put ZIP-File in Response +++
response->set_data( xzippedfile ).
response->set_header_field( name  = if_http_header_fields=>content_type
          value = 'application/octet-stream' ).
response->set_header_field( name  =
if_http_header_fields=>content_length
          value = xzippedcontentlengthstring ).
response->set_header_field( name  = 'Content-Disposition'
value = 'inline;filename=test.zip' ).
navigation->response_complete( ).
Thanks Timo

Answer 1

I was on vaca, sorry for the late reply.
I can't see the video card but from what I see on the rest of the spec, those stats are extremely low.
An OS (especially modern) consumes 700~1GB RAM itself. Depending on the video cards amount of RAM, if it requires using RAM, you already only have around 1GB to share. So your hard disk will be thrashed on a system like that struggling to keep RAM managed.
The CPU is very slow, in the value line. You can look on several sites which measure various components to see where you fall for performance. For example, Passmark (fairly reliable at quick glance) puts your CPU in the mid to low (value) range and has a score of 808. A mid to high end, standard CPU these days (~$300 range) is around 10,000 and above:
http://www.cpubenchmark.net/midlow_range_cpus.html
1.7GHz is pretty slow and without any Intel-esque turbo boost, the CPU is really going to be sluggish.
I would say that laptop is designed to read email and surf the web. I think it would even struggle to play HD video, let alone render real-time modern Canvas 2d animation with any level of consistency. If you do "anything else" while the animation happens, or if the animation is fairly layered, this machine will bog down. It should be entirely visible in your task managers performance tab. Most likely you'll see the CPU peg out at 100% and memory not far behind it. Take a glimpse.
I think your entire issue is that computer, not CanvasJS/EdgeJS differences.