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这是我写的数据连接代码。
& P. Q; L0 T9 S% O) S' R2 F//---------------------------------------------------------------------------
3 F6 N5 K" B0 J2 m2 w
9 K# K3 @7 \& P#include <vcl.h>
% Q9 u0 o+ |' M4 Q2 j: H#pragma hdrstop
1 \6 K; Q: W( r( D2 n4 p4 n# U, v2 l0 G) V
#include "Unit1.h"
% T* x- o8 w8 s" f3 r#include "Stdlib.h"% h: D, F+ q( \) g: C+ P
#include "Stdio.h"; Q/ D, f* q. c1 O
#include "mathlink.h"
; l$ \1 Z& ]6 g5 W#include "String.h" Y& o$ L7 o* g" _/ i
static int read_and_print_expression( MLINK lp);" \, l, c0 D( V U1 ]
static int read_and_print_atom( MLINK lp, int tag);
* Y% w6 w5 {* ?: ]0 J; \static int read_and_print_function( MLINK lp);
0 p5 J" v% v D) Y//---------------------------------------------------------------------------
5 W, U a# [* Y% x% q7 Q( G2 N5 ?- \# P#pragma package(smart_init)
9 h) U/ [" N5 A) a( F) U#pragma link "RzEdit"
1 N4 {& m3 s( K2 I9 N#pragma resource "*.dfm"3 ?' |, L) X& S4 A* v- c% Q0 S# j& F# G
TForm1 *Form1; i8 H6 J( z. p4 o1 ]
, l% [9 v) A- @int sum;
" f$ b3 f3 V8 R* {3 ~double tmpbackreal;
& \% k, M: \" bMLEnvironment env;
4 O" O, o2 @( d& Y4 ^4 q9 ]/ GMLINK lp;
: l( e7 O5 Q* ?* D$ ~% H- Yint argc = 4;
" b3 E6 [9 k% b& c# I0 j( Xchar *argv[5] = {"-linkname",
7 Y( T6 V" j# ` x% h/ A5 J9 W "D:\\Program Files\\Mathematica\\9.0\\mathkernel -mathlink",
8 \ a8 I. n% Z7 R$ O; L$ W "-linkmode",
5 _& e, G1 X3 ]! Q& a, \0 X "launch",% ]# b2 j( @! E6 r2 {; ?; r; X
NULL};& K6 j c; D4 @3 c0 \! D
: @" O: O' q) m4 X
//---------------------------------------------------------------------------6 ?- W- e. I2 ]+ i5 M- w
__fastcall TForm1::TForm1(TComponent* Owner) S$ R- R! g0 Q! q7 H; r! d( y, n
: TForm(Owner)
& B1 c7 Q1 Q6 K- S% C{
4 H' V) G0 r0 I& P}; A7 H- j- f: \" ]' z3 ?
//---------------------------------------------------------------------------
9 i* w1 x4 z8 z+ m T# Mvoid __fastcall TForm1::Button1Click(TObject *Sender): W1 F5 f- f- X" n
{$ O8 O5 H: A* h& t5 z( v
const CHAR *pOutputString;
, N4 d C1 h0 U* R8 y5 i MLPutFunction(lp, "EvaluatePacket", 1);
; V* y- R" M9 J! D MLPutFunction(lp, "ToExpression", 1);5 Y7 q5 b2 H. i
MLPutString(lp, AnsiString(Edit1->Text).c_str());9 Z4 S6 P) E" x+ ^* \. @) l
MLEndPacket(lp);0 M% a4 B w- v; }/ e3 B
while (MLNextPacket(lp) != RETURNPKT) MLNewPacket(lp);) g6 d: u0 E. k
read_and_print_expression(lp);; X$ u Q7 N. m" r
}
9 C9 I' w7 j0 s6 {//---------------------------------------------------------------------------
; C! `% @; Y; _( I- dvoid __fastcall TForm1::FormCreate(TObject *Sender)
/ Y4 I5 t2 p+ f# b{
2 j0 x" K; G2 L* q1 Y! u3 M Edit1->Text = "Power[2,5]";$ h/ n6 o3 ?/ j- W) I
env = MLInitialize(NULL); if(env == NULL) Edit2->Text = "出错env" ;
& H4 h+ i1 R$ ^7 D- _ lp = MLOpen(argc, argv); if(lp == NULL) Edit2->Text = "出错lp" ;
6 z! @- f$ Z: _0 Z! R& o}: B E+ ~% X& @. V
//---------------------------------------------------------------------------
8 Q8 s1 _7 I4 ?& c; a5 T
2 B9 _1 y# _; i! w; Xvoid __fastcall TForm1::Button2Click(TObject *Sender)
4 J4 R! z7 z8 X2 |3 y{
( D3 o/ O# C/ c k MLClose(lp);
1 ^, w6 N4 \8 L8 ^' _3 o" k MLDeinitialize(env);
4 f |) Q! G& Q F: V}) h0 a3 K% j/ W! p4 n- U
//---------------------------------------------------------------------------3 X" h& U, v0 m2 R. n9 ?, n
static int read_and_print_expression( MLINK lp)
; K6 Y$ [* f2 D- S{* {0 f6 _, M/ d4 C
int tag;3 G/ w* @+ r# C5 d* L
- F, B- D+ L6 H: J4 \/ X! G$ m! |
switch (tag = MLGetNext( lp)) {$ e4 X9 K/ s; t
case MLTKSYM:
& q3 r1 p7 ^' ]/ x case MLTKSTR:
# P" T! X. ?# g4 p# p& ~' | case MLTKINT:
! k b5 i+ M. e. P4 t Form1->RzNumericEdit1->Text = tag;9 I$ a, ^0 N6 B& W2 {4 V7 ?
Form1->Label1->Caption = Form1->RzNumericEdit1->Text;
" \/ `7 m7 Z4 [6 {! ^ return read_and_print_atom( lp, tag);2 Z; J5 L6 s# P
case MLTKREAL:
# I3 N2 F& s M Form1->RzNumericEdit1->Text = tag;
: p D. V' E, H j/ @+ }7 c3 \ Y Form1->Label1->Caption = Form1->RzNumericEdit1->Text;
* C( H6 @* K# W) w8 { return read_and_print_atom( lp, tag);
/ ^8 F' D+ [& H1 X A' m case MLTKFUNC:
9 J, D1 L5 m* J w( h' J7 P) H1 h return (read_and_print_function( lp));8 X. I$ \" A1 `. i8 K: O9 p
case MLTKERROR:
9 Z& v x0 s. f3 K. A3 V //case MLTKGRAF;
4 F r2 I' w7 Z1 U; \, |: R default:" N, }6 ?& C6 L; D7 N, B* |( ^
return 0;6 l# u* d' c% E w7 x, B
} d' [ L0 j. \5 O
8 N0 r% K% h1 y( J b
}
, F+ ?& z& H' y4 g5 S- N) _5 P6 S6 |) y2 G4 r2 K
static int read_and_print_function( MLINK lp)- P7 Q$ _9 h% X" K7 P8 M
{
, c) _# Y- R$ w" g int len, i;' n; R+ m% Q, ~& F6 V
static int indent;
: r7 d0 Z z3 U4 x& s+ v9 c3 C+ X8 H9 [3 X
if( ! MLGetArgCount( lp, &len)) return 0;
4 j* a. @5 N# h, q0 b& a0 d! O/ Z7 Y6 A8 L* ^0 x! E
indent += 3;
- H3 u& \3 ? n; D7 K- u printf( "\n%*.*s", indent, indent, "");# _2 [/ _. \4 |; j5 y
( K7 k% t. ~4 l/ X/ ]" }
if( read_and_print_expression( lp) == 0) return 0;
9 ?, n! T6 x, v" L; ~ printf( "[");
8 {' s8 A# |0 N
: f* c2 C' O& ~! K0 `' V' [5 \0 d for( i = 1; i <= len; ++i) {
, n4 j2 U% ^# u3 L if( read_and_print_expression( lp) == 0) return 0;
" C0 K1 R' v4 @+ D; K/ ~2 ? if( i < len) printf( ", ");
. z1 o8 ~/ O$ o- z9 d& F5 U9 g9 p }
7 }# @- p' G: c printf( "]");
+ P& J5 i7 D6 R# t+ f# x; b; T% h" u indent -= 3;0 g* n! u% d- p5 R' V: B; i
2 L9 {' L9 q. x6 t* r6 `/ P! I return 1;9 f0 i7 L) I! g, G( c: V" o
}
" M+ ^/ z" d7 w
! c+ P& J$ _7 E! Pstatic int read_and_print_atom( MLINK lp, int tag)# r9 b/ b$ N( x0 l2 L
{
/ I' J- Z: q: X) Y' n" _#if MLINTERFACE >= 3/ q5 C! V) S7 y+ k9 Z: l2 t
const char *s;, z) V# T6 \% M$ ?
#else W' h, c8 g$ C' g' D- V4 {6 s4 ?- J
kcharp_ct s;
) p, v2 H* C( S3 z% a; G0 V#endif /* MLINTERFACE >= 3 */
- g, k" ~" _4 w3 j if( tag == MLTKSTR) putchar( '"');
( G- H% g# S5 ~& U* V7 w S+ {. o3 o1 S if( MLGetString( lp, &s)){
: l+ Y, {* B' A3 m% B //printf( "%s", s);6 q, ]7 t. U/ p+ }9 O9 N7 w
Form1->Memo1->Text = AnsiString(s).c_str();
, W8 J7 v7 R. l MLDisownString( lp, s);4 u7 @1 k6 l4 C2 I
}' W P# c3 s! X( M8 W
if( tag == MLTKSTR) putchar( '"');, d9 E- M9 Y4 l- p
putchar( ' ');2 z* m) P. _9 f$ ]6 h! @
return MLError( lp) == MLEOK;
' {$ p- I' A9 Z3 O9 C- q} ~7 V |. A% }! ]" h
3 ?* X5 p) E5 L9 B tstatic void error( MLINK lp)+ l1 D( O( S% H" K4 r
{
: w0 r8 u& O% l/ T$ g- N0 t8 f if (MLError( lp)) {
6 m8 M' d7 I" q fprintf( stderr, "Error detected by MathLink: %s.\n", g7 l6 w3 j, T1 H
MLErrorMessage( lp));: L( g( L- G& l& V/ Y' e# o
}else{
2 s5 y. W5 F6 F/ m; s! N fprintf( stderr, "Error detected by this program.\n");, k" O( {1 ?# H. b. k, A0 P9 V% c M
}7 I& p7 r' K3 u
exit( 1);: _8 B! D6 R* G2 L$ X7 D: J& x6 c) A
}5 W5 k& S4 a! l, i# Y
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