From: Robert Haas <robertmhaas@gmail.com>
To: eehab hamzeh <eehab40@hotmail.com>
Cc: pgsql-committers@postgresql.org
Subject: Re:
Date: Mon, 6 Apr 2009 12:27:39 -0400
Message-ID: <603c8f070904060927v3731ec89v2dbb2ffe5c58b718@mail.gmail.com> (raw)
In-Reply-To: <BLU133-W10C7111FE617947576A5E8A0840@phx.gbl>
References: <BLU133-W319D3FE0D6E866A8A2B529A0840@phx.gbl>
<f205bb120904060607u3a4d9feci55bad4a490b3cecf@mail.gmail.com>
<BLU133-W10C7111FE617947576A5E8A0840@phx.gbl>
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...Robert
2009/4/6 eehab hamzeh <eehab40@hotmail.com>:
>
> here are the code and the error , i compile them using vc++ 6 and VC++ 2008
> and minGW the example below are for minGW
> THANKS
>
> #include "postgres.h"
> #include <string.h>
> #include "fmgr.h"
>
> #ifdef PG_MODULE_MAGIC
> PG_MODULE_MAGIC;
> #endif
>
> /* by value */
>
> PG_FUNCTION_INFO_V1(add_one);
>
> Datum
> add_one(PG_FUNCTION_ARGS)
> {
> int32 arg = PG_GETARG_INT32(0);
>
> PG_RETURN_INT32(arg + 1);
> }
>
> /* by reference, fixed length */
>
> PG_FUNCTION_INFO_V1(add_one_float8);
>
> Datum
> add_one_float8(PG_FUNCTION_ARGS)
> {
> &nb sp; /* The macros for FLOAT8 hide its pass-by-reference nature. */
> float8 arg = PG_GETARG_FLOAT8(0);
>
> PG_RETURN_FLOAT8(arg + 1.0);
> }
>
> PG_FUNCTION_INFO_V1(makepoint);
>
> Datum
> makepoint(PG_FUNCTION_ARGS)
> {
> /* Here, the pass-by-reference nature of Point is not hidden. */
> Point *pointx = PG_GETARG_POINT_P(0);
> Point *pointy = PG_GETARG_POINT_P(1);
> Point *new_point = (Point *) palloc(sizeof(Point));
>
> new_point->x = pointx->x;
> new_point->y = pointy->y;
>
> PG_RETURN_POINT_P(new_point);
> }
>
> /* by reference, variable length */
>
> PG_FUNCTION_INFO_V1(copytext);
>
> Datum
> copytext(PG_FUNCTION_ARGS)
> {
> text *t = PG_GETARG_TEXT_P(0);
> /*
> * VARSIZE is the total size of the struct in bytes.
> */
> text *new_t = (text *) palloc(VARSIZE(t));
> VARATT_SIZEP(new_t) = VARSIZE(t);
> /*
> * VARDATA is a pointer to the data region of the struct.
> */
> memcpy((void *) VARDATA(new_t), /* destination */
> (void *) VARDATA(t), /* source */
> VARSIZE(t)-VARHDRSZ); /* how many bytes */
> PG_RETURN_TEXT_P(new_t);
> }
>
> PG_FUNCTION_INFO_V1(concat_text);
>
> Datum
> concat_text(PG_FUNCTION_ARGS)
> {
> text *arg1 = PG_GETARG_TEXT_P(0);
> text *arg2 = PG_GETARG_TEXT_P(1);
> int32 new_text_size = VARSIZE(arg1) + VARSIZE(arg2) - VARHDRSZ;
> text *new_text = (text *) palloc(new_text_size);
>
> VARATT_SIZEP(new_text) = new_text_size;
> memcpy(VARDATA(new_text), VARDATA(arg1), VARSIZE(arg1)-VARHDRSZ);
> memcpy(VARDATA(new_text) + (VARSIZE(arg1)-VARHDRSZ),
> VARDATA(arg2), VARSIZE(arg2)-VARHDRSZ);
> &n bsp; PG_RETURN_TEXT_P(new_text);
> }
>
>
> the error
>
> in function 'makepoint':
> error: 'Point' undeclared (first use in this function)
> error: (each undeclared identifier is reported only one
> error: for each function it appears in.)
> error: 'pointx' undeclared (first use in ´this function)
> error: 'pointy' undeclared (first use in his fnction)
> error 'new_point' undeclared (first use in his function)
> error: syntax error befre ')' oken
> in function 'copy text':
> error: 'invalid lvalue in assinment
> In function 'concat_text'
> error: invalid lvalue in assignement
> warning no new line at end of file
>
> Please any direction of how to solve the problem
>
> thanks
>
> < img alt="">
>
>
>
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To: pgsql-committers@postgresql.org
Cc: robertmhaas@gmail.com, eehab40@hotmail.com
Subject: Re:
In-Reply-To: <603c8f070904060927v3731ec89v2dbb2ffe5c58b718@mail.gmail.com>
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