| Re: Using Windows IDL to access a UNIX database using DLM's [message #49068 is a reply to message #48956] |
Tue, 13 June 2006 10:51  |
Haje Korth
Messages: 651
Registered: May 1997
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Senior Member |
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Ryan,
maybe I am blind but the file pgsqltoidl.c which contains IDL_Load is
not even contained in your compiler call, right? Once you include it
you should be in good shape.
Cheers,
Haje
cl -D_DLL -DMSWIN -DWIN32 -D_MT /nologo
/I"C:\RSI\IDL62\external\include" /c
"Z:\Database_Access\PGSQLfunctions.c"
/Fo"PGSQLfunctions_4040_ACEDESK3.obj"
PGSQLfunctions.c
link /out:"PgsqlToIdl_4040_ACEDESK3.dll" /nologo /nodefaultlib /dll
"PGSQLfunctions_4040_ACEDESK3.obj" /def:"PgsqlToIdl_4040_ACEDESK3.def"
"C:\RSI\IDL62\bin\bin.x86\idl32.lib" msvcrt.lib kernel32.lib
rchughes@gmail.com wrote:
> Hey All,
>
> I am relatively new to using IDL with very little knowledge of in-depth
> computer stuff (compilers/linkers/etc.). I am trying to access a
> database using DLM's written by someone else (in C). I have spent way
> too long trying to solve the problem by downloading different
> compilers, looking into different linking issues and I still haven't
> accomplished much. My major issue is trying to get IDL to load the DLM
> and use it. I have added a IDL_DLM_PATH to my environment variables so
> that when I type "help, /dlm" at the command line it shows that my DLM
> is there. I then try to call a DLM it gives me an error that it can't
> find the desired functions.
>
> If you have had success using DLM's from Windows IDL please respond
> because there is something that I'm doing incorrectly. I think that my
> problem is that i am unable to generate the sharable library (dll file)
> but I'm not exactly sure why. I have tried to follow the example of
> for 'testmodule' given in the External Development Guide and that works
> fine. I have followed build_testmodule.pro as an example to create my
> own build_pgsql_functions.pro file but it has problems with generating
> the sharable library.
>
> The error that I get is:
> cl -D_DLL -DMSWIN -DWIN32 -D_MT /nologo
> /I"C:\RSI\IDL62\external\include" /c
> "Z:\Database_Access\PGSQLfunctions.c"
> /Fo"PGSQLfunctions_4040_ACEDESK3.obj"
> PGSQLfunctions.c
> link /out:"PgsqlToIdl_4040_ACEDESK3.dll" /nologo /nodefaultlib /dll
> "PGSQLfunctions_4040_ACEDESK3.obj" /def:"PgsqlToIdl_4040_ACEDESK3.def"
> "C:\RSI\IDL62\bin\bin.x86\idl32.lib" msvcrt.lib kernel32.lib
> PgsqlToIdl_4040_ACEDESK3.def : error LNK2001: unresolved external
> symbol IDL_Load
> PgsqlToIdl_4040_ACEDESK3.lib : fatal error LNK1120: 1 unresolved
> externals
> LINK : fatal error LNK1141: failure during build of exports file
>
>
> Here is the code for build_pgsql_functions.pro:
> pro build_PGSQL_functions, VERBOSE=verbose
> ;Locating the PgsqlToIdl files
> rootdir = 'Z:\'
> subdirs = ['Database_Access']
> pgsqltoidl_dir = filepath('', ROOT_DIR=rootdir, SUBDIRECTORY=subdirs)
> dlm_file = filepath('PgsqlToIdl.dlm', ROOT_DIR=rootdir,
> SUBDIRECTORY=subdirs)
>
> new_dlm_file = filepath('PgsqlToIdl.dlm',
> ROOT_DIR=!make_dll.compile_directory)
>
> ;Build the PostGresSQL DLM in the !make_dll.compile_directory
> make_dll, 'PGSQLfunctions', 'PgsqlToIdl', 'IDL_Load',
> INPUT_DIR=pgsqltoidl_dir, $
> VERBOSE=verbose, SHOW_ALL_OUTPUT=verbose, /NOCLEANUP
>
> ;Copy the DLM file into the director with the sharable library
> file_copy, dlm_file, new_dlm_file, /OVERWRITE
> end
>
> Here is a sample of the pgsqlToIdl.dlm file:
> MODULE PGSQLTOIDL
> DESCRIPTION IDL Interface to libpq (Postgres)
> VERSION 1.2beta
> SOURCE RS
> BUILD_DATE May 17, 2004
> FUNCTION PGSQL_CONNECT 1 1
> PROCEDURE PGSQL_DISCONNECT 1 1 KEYWORDS
> FUNCTION PGSQL_SELECT 3 3
> FUNCTION PGSQL_COMMAND 2 2
> FUNCTION PGSQL_PQSTATUS 1 1
> FUNCTION PGSQL_PQRESSTATUS 1 1
> FUNCTION PGSQL_PQCONNECTDB 1 1
> FUNCTION PGSQL_PQSETDBLOGIN 7 7
> FUNCTION PGSQL_PQSETDB 5 5
> ...
>
> Here is the code for the pgsqltoidl.c file:
>
> /* ANSI */
> #include <stdio.h>
> #include <stdlib.h>
> #include <math.h>
> #include <string.h>
>
> /* IDL */
> #include "idl_export.h"
>
> /* Postgresql */
> #include "libpq-fe.h"
>
> /* Local */
> #include "PgsqlToIdl.h"
>
> /* Define message codes and their corresponding printf(3) format
> strings.
> * Note that message codes start at zero and each one is one less than
> the
> * previous one Codes must be monotonic and contiguous. Must match to
> * corrisponding entries in PgsqlToIdl.h */
>
> static IDL_MSG_DEF msg_arr[] =
> {
> { "PgsqlToIdl_Error", "%NError: %s." },
> { "PgsqlToIdl_NOSTRINGARRAY", "%Nstring arrays not allowed %s"},
> };
>
> /* The load function fills this message block handle with the opaque
> handle to
> * the message block used for this model. The other routines can then
> us it
> * to throw errors from this block. */
>
> IDL_MSG_BLOCK msg_block;
>
> int IDL_Load(void)
> {
> /* Define the message block */
> if (!(msg_block = IDL_MessageDefineBlock("PgsqlToIdl",
> ARRLEN(msg_arr),
> msg_arr))) {
> return IDL_FALSE;
> }
>
> /* Call the startup function to add the routines to IDL. */
>
> /* Routines */
> if (!PgsqlToIdl_Startup()) {
> IDL_MessageFromBlock(msg_block, PgsqlToIdl_ERROR,
> IDL_MSG_RET, "Unable to initialize PostgreSQL to IDL interface");
> }
>
> return IDL_TRUE;
> }
>
> Here is my PgsqlToIdl.def file that is needed for windows:
> LIBRARY "PGSQLfunctions"
> EXPORTS IDL_Load @1
>
> All the routines are in a different file called PgsqlToIdlfunctions.c.
> I tried copying these functions into the PgsqlToIdl.c file so that they
> compile at the same time but that doesn't work.
>
> FYI: the PgsqlToIdl_Startup function is found in the
> PgsqlToIdlfunctions.c file, which is partly why I think it cannot load
> it.
>
> Any help determining where I am going wrong would be greatly
> appreciated.
>
> Ryan.
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