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这是我写的数据连接代码。
9 ^- R" l( O% o- u$ {//---------------------------------------------------------------------------1 t R- |; [. Z6 N. Q
9 }# u5 ~! B9 k. j6 b1 k: g#include <vcl.h>9 i% p- I k- l$ G, `7 B$ }+ I
#pragma hdrstop
, p$ l% Z% {0 H9 r- ?5 _" R( G( Q [+ y. d0 a
#include "Unit1.h"
) z$ S7 t6 Q( w1 X#include "Stdlib.h"
! m0 u( r3 l* ^, c% I( O#include "Stdio.h"$ w8 ?8 T% L3 H1 _/ f/ f3 O( u9 u
#include "mathlink.h", V: c& R) o0 G7 s. m/ U
#include "String.h", V0 b7 J+ y) t8 V& N3 @2 v
static int read_and_print_expression( MLINK lp);
- Q) U! @! m) b5 q0 ^/ q& lstatic int read_and_print_atom( MLINK lp, int tag);8 g0 n3 ~/ B2 Y+ e: T5 `
static int read_and_print_function( MLINK lp);
9 \: ? }# X5 O' K# M3 X) g( d//---------------------------------------------------------------------------
: R+ L( l0 z+ V- `, p1 j; M, `5 R# b#pragma package(smart_init)7 Y4 i; a, f, s3 J* \
#pragma link "RzEdit"# e% M# g1 b4 i' }2 r
#pragma resource "*.dfm". R, a# j e$ T- j
TForm1 *Form1;9 T; {) U( s& d4 `( R7 d' l
+ y* H7 S Q, V9 @# F6 g7 G2 V
int sum;
4 P' G* K' j; N5 m# c2 U3 mdouble tmpbackreal;
! e/ D% D7 ]. {* T5 D# RMLEnvironment env;% S5 q+ O: \; k- W9 i: R1 U9 G
MLINK lp;
2 D' l9 d/ G( _: ] T+ Lint argc = 4;1 i4 o5 ~2 B1 l: |: w2 o) Z
char *argv[5] = {"-linkname",4 j9 m) m( S0 H3 k9 }. O- u e
"D:\\Program Files\\Mathematica\\9.0\\mathkernel -mathlink",1 @0 r9 R5 n0 G. {
"-linkmode",7 x8 H/ C8 R( M: `; E
"launch",
1 V& J! H0 X E, [ NULL};
% W% c/ q' q; o) L% C; U, E. X- X, g* y4 k- t
//---------------------------------------------------------------------------
/ J; i! {3 n, c7 K& S5 b2 ~' r3 v__fastcall TForm1::TForm1(TComponent* Owner)* o9 s+ h% k" W; I. n
: TForm(Owner)' x8 O1 I- c# z% j! x& f4 s
{6 C& s% d% S0 |" R" j
}
+ d, T+ c) K& y) k1 Q2 z# Q//---------------------------------------------------------------------------
' |) }2 P+ T+ \& Z+ j; Svoid __fastcall TForm1::Button1Click(TObject *Sender)
( X0 @4 ^) s: n" S) P! y2 `{ ^' e, i. w4 M! p" g
const CHAR *pOutputString;
) k$ b3 m- l l4 i9 v MLPutFunction(lp, "EvaluatePacket", 1);9 c$ D" p5 n" Q
MLPutFunction(lp, "ToExpression", 1);& r5 F! z$ F9 }
MLPutString(lp, AnsiString(Edit1->Text).c_str());
d N; S8 e5 _ o& G, I MLEndPacket(lp);5 W5 X/ \1 a- Y* {
while (MLNextPacket(lp) != RETURNPKT) MLNewPacket(lp);
7 z) ]. [$ t* k& H; L2 Y read_and_print_expression(lp);$ h8 w; a- `: U% O
}5 R/ x5 A6 @1 k: C
//---------------------------------------------------------------------------
5 A+ m3 R# k `8 S: Ovoid __fastcall TForm1::FormCreate(TObject *Sender)
% e, o9 Y! o& B7 c{
, `0 e2 G m! u- e& N+ ^! Z Edit1->Text = "Power[2,5]";
& D1 |- e: W: R7 e- h* e+ f env = MLInitialize(NULL); if(env == NULL) Edit2->Text = "出错env" ;$ B, M' g. ?& U$ J
lp = MLOpen(argc, argv); if(lp == NULL) Edit2->Text = "出错lp" ;
o' l3 R3 d6 T9 e/ Z+ s! H}8 h7 x. I2 g* p* ]4 ^' T
//---------------------------------------------------------------------------
8 v% C# ?3 S: D( b* Z% I: X! |& b7 q' c5 ^6 G0 J
void __fastcall TForm1::Button2Click(TObject *Sender)
1 g8 z5 o1 _8 F; W, l" ~{
5 k8 B$ Y% g$ [0 E' d! y MLClose(lp);
- [* T/ O& J5 g1 d) o3 A0 u+ E MLDeinitialize(env);' a& q0 N$ Y& V3 \8 L/ ~( \2 L
}
" u i: |) F+ a" }5 P//---------------------------------------------------------------------------
+ Q5 ?" Z5 U% @8 G$ V" Zstatic int read_and_print_expression( MLINK lp)
8 X- r8 h( L4 E% ^+ n' M( e{
; z$ F) F, V% @, n- |8 N8 k int tag;; R$ t* F; q, H! S8 B2 z
' t7 z3 U3 x8 f' @8 }! I9 k7 y7 o! O
switch (tag = MLGetNext( lp)) {5 ^, z/ F6 z& s# l( c0 a" F
case MLTKSYM:
0 R8 {6 d0 [! e& f( {1 V# v case MLTKSTR:
% t* L E6 b% s6 i8 p* q case MLTKINT:
7 ]" U) n3 a4 ~4 J! K9 L Form1->RzNumericEdit1->Text = tag;" W- G- [5 ]- e. d+ X( l. D
Form1->Label1->Caption = Form1->RzNumericEdit1->Text;$ \4 X9 E' p" B0 S
return read_and_print_atom( lp, tag);
; j# F$ l# z- W3 _! C7 [ case MLTKREAL:
; x- f q# p K& h1 W& e Form1->RzNumericEdit1->Text = tag;' X- q, k5 {1 z
Form1->Label1->Caption = Form1->RzNumericEdit1->Text;5 w# \3 d+ W! k
return read_and_print_atom( lp, tag);$ j0 r3 k5 C5 F. t; S8 v
case MLTKFUNC:
! G/ G5 S! M6 p7 _' \ T2 I return (read_and_print_function( lp));2 i9 P% s, q" h
case MLTKERROR:5 v8 j2 U$ T6 K
//case MLTKGRAF;
5 [; i& M0 s8 E8 T default:4 a& Z/ M2 i* n' {9 W6 J0 ?
return 0;7 b* i8 ~& Q0 ]- c5 g" u
}; e0 i# W" a) v7 ~+ l* @2 y3 F
* c+ C* I' I4 M
}
v0 m. b+ v+ f2 S8 l" K( W- X* D9 m7 A# J% j- P2 M4 `" [' B+ G
static int read_and_print_function( MLINK lp)
( S$ J$ ~% `1 b V1 I{2 d+ L7 H' t" j/ }' M1 Q
int len, i;+ M- \2 S; a* G+ G
static int indent;
5 L- {4 z* g: l8 @" u. c6 h0 g% _; x
! a7 Z8 {3 \% T! r- i if( ! MLGetArgCount( lp, &len)) return 0;
, q p' W% n; @# f- }. l" J
! M8 h& ]1 D. D1 ~/ C- R indent += 3;1 U! g( r! N8 e
printf( "\n%*.*s", indent, indent, "");$ _2 k3 O. K8 g
+ o/ u( t6 n7 C8 g4 B, r- a
if( read_and_print_expression( lp) == 0) return 0;
4 R8 g' S+ l6 Z' t6 O/ L) e printf( "[");
; Z) E) z2 _+ p
3 H, k9 m) \/ ^7 [& { for( i = 1; i <= len; ++i) {
* M. h" ]: |+ ~# S& h8 u if( read_and_print_expression( lp) == 0) return 0;) E" \& n' u! e" d3 u& r0 n! Q
if( i < len) printf( ", ");* z4 z/ `, p; z* F J
}
( u" z- H3 s Q, V' h printf( "]");' }1 Q' r1 h+ A
indent -= 3;
3 b- u" G1 v/ f6 z- S# }4 Y4 |( |+ Q; n& E. k* V& W+ {7 n
return 1;) b/ ~/ B9 ~& i/ B; e5 `- ?3 k
}. k+ L- x% [. O
, @5 d3 R7 F2 kstatic int read_and_print_atom( MLINK lp, int tag), |& K. ?. r# J0 x7 O2 b8 q
{- l6 N8 h7 K+ _! I* E9 i
#if MLINTERFACE >= 3
, X b2 O% `* c% p" W const char *s;
* z, f: }5 \% p/ p) {9 X#else
% D7 I/ K* {: c7 ^" |6 j kcharp_ct s;+ r2 X- D2 R6 d5 ~' d% q
#endif /* MLINTERFACE >= 3 */
v" Q9 `4 a+ P, _: [ if( tag == MLTKSTR) putchar( '"');$ T; X! Y, \* G1 p
if( MLGetString( lp, &s)){
8 r4 O! D' q$ y9 c4 J% X1 O //printf( "%s", s);
" ^3 z! D" r! h2 w/ G% x Form1->Memo1->Text = AnsiString(s).c_str();8 r3 ~2 u( Q+ c) L1 y l. q
MLDisownString( lp, s);
. y! j4 z- }- c* F }
4 z. W/ A+ \) R8 s" m8 I if( tag == MLTKSTR) putchar( '"');
5 K L- | v+ g# w7 H putchar( ' ');
/ E9 s1 l6 L$ c; e: y. ^ return MLError( lp) == MLEOK;
+ K* \2 C" `) d7 v+ J0 g! Z3 M}
) @3 A* Q% {5 z+ o) @# G" X1 g/ T- ?$ ^: V* x
static void error( MLINK lp)1 [: m7 c- j* L/ N7 L
{- b/ A8 c5 u# W+ x0 w' |9 A
if (MLError( lp)) {9 B0 B8 n" M e) P* [
fprintf( stderr, "Error detected by MathLink: %s.\n",
3 @, _4 v6 `/ A6 N& J MLErrorMessage( lp));
4 |% @# U5 t; o }else{
& f( b& `; S& M fprintf( stderr, "Error detected by this program.\n");
9 B# C' i, j Q7 ^9 B6 l }
7 T+ t& T4 h8 G5 e exit( 1);
) L: Y7 G0 ^0 a8 W! C}! r% l, l. ^% S
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