AS400 Example of ILE RPG CGI Program -- AS400 AS/400 tnt400.com

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All AS/400 Tip Categories / AS/400 Programming / Example of ILE RPG CGI Program

Question:

I'm looking for a CGI program example. I've heard that you can program it in RPG/ILE, but I have never seen it. Do you have any books or sample code?

Answer(s):

Take a look at
http://publib.boulder.ibm.com:80/cgi-bin/bookmgr/BOOKS/QB3AEQ02/CCONTENTS

A very simple one that only outputs data looks as follows;

DOutBuff          S           2048A
DOutBuffLn        S              9B 0 Inz(2048)
DAPIError         DS
D APIBytes                1      4B 0
D CPFId                   9     15
DAPIStdOut        C                   'QtmhWrStout'
DHTML             S            100    Dim(6) PerRcd(1) CtData
DNewLine          C                   X'15'
C                   MoveL     *Blanks       OutBuff
C     1             Do        6             n                 5 0
C                   Cat       HTML(n):0     OutBuff
C                   Cat       NewLine:0     OutBuff
C                   EndDo
C                   ExSr      StdOut
C                   SetOn                                        Lr
C                   Return
C     StdOut        BegSr
C                   Eval      APIBytes = %Size(APIError)
C                   Eval      OutBuffLn = %Len(%Trim(OutBuff))
C                   CallB     APIStdOut
C                   Parm                    OutBuff
C                   Parm                    OutBuffLn
C                   Parm                    APIError
C                   EndSr
**CTDATA HTML
Content-type: text/html

<HTML>
<HEAD><TITLE>Hello world CGI sample</TITLE></HEAD>
Hello world.
</BODY></HTML>

BTW, if you build the output string like this, it's recommended to use varying length fields, and just before the API copy them to the fixed length output field. The difference in performance is huge when some string handling is done.

I continually cringe at CGI examples that use arrays in the RPG Program. Try this helloworld program out for size.

 ****************************************************************
 * 1. CRTRPGMOD MODULE(lib/HELLOW) +                            *
 *     SRCFILE(lib/QRPGLESRC) TGTRLS(V3R7M0)                    *
 *                                                              *
 * 2. CRTPGM PGM(lib/HELLOW) BNDSRVPGM(QTCP/QTMHCGI)            *
 *                                                              *
 ****************************************************************
D WPError         DS
D  EBytesP                1      4B 0 INZ(40)
D  EBytesA                5      8B 0
D  EMsgID                 9     15
D  EReserverd            16     16
D  EData                 17     56
 *
D HTTPHeader      C                   CONST('Content-type: text/html')
D NewLine         C                   CONST(X'15')
 *
D WrtDta          S           1024
D WrtDtaLen       S              9B 0
 ****************************************************************
C                   EXSR      $Main
 *
C                   eval      *INLR = *On
 ****************************************************************
 * Main Subroutine
 ****************************************************************
C     $Main         BEGSR
 *
C                   eval      WrtDta = '<html><head>' +
C                                      '<title>Hello World</title>' +
C                                      '</head><body>' +
C                                      'Hello World!' +
C                                      '</body></html>' +
C                                      NewLine
C                   EXSR      $WrStout
 *
C                   ENDSR
 ****************************************************************
 * Write to Standard Output
 ****************************************************************
C     $WrStout      BEGSR
 *
C     ' '           CHECKR    WrtDta:1024   WrtDtaLen
 *
C                   CALLB     'QtmhWrStout'
C                   PARM                    WrtDta
C                   PARM                    WrtDtaLen
C                   PARM                    WPError
 *
C                   ENDSR
 ****************************************************************
 * Initialization Subroutine
 ****************************************************************
C     *INZSR        BEGSR
 *
C                   eval      WrtDta = %trim(HTTPHeader) +
C                                      NewLine + NewLine
C                   EXSR      $WrStout
 *
C                   ENDSR

This should do it...

DOutBuff          S           2048A
DOutBuffLn        S              9B 0 Inz(2048)
DAPIError         DS
D APIBytes                1      4B 0
D CPFId                   9     15
DAPIStdOut        C                   'QtmhWrStout'
DHTML             S            100    Dim(8) PerRcd(1) CtData
DNewLine          C                   X'15'
C                   Eval      OutBuff = ''
C     1             Do        8             n                 5 0
C                   Cat       HTML(n):0     OutBuff
C                   Cat       NewLine:0     OutBuff
C                   EndDo
C                   ExSr      StdOut
C                   SetOn                                        Lr
C                   Return
C     StdOut        BegSr
C                   Eval      APIBytes = %Size(APIError)
C                   Eval      OutBuffLn = %Len(%Trim(OutBuff))
C                   CallB     APIStdOut
C                   Parm                    OutBuff
C                   Parm                    OutBuffLn
C                   Parm                    APIError
C                   EndSr
**CTDATA HTML
Content-type: text/html
!!!this is a blank line!!!
<HTML>
<HEAD><TITLE>Hello world CGI sample</TITLE></HEAD>
<BODY>
Hello world.
</BODY>
</HTML>

Don't forget to compile it with service program QTCP/QTMHCGI

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