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这是我写的数据连接代码。
# H, q: ]1 n. d% p8 C//---------------------------------------------------------------------------
# B3 O/ r7 ?4 [0 ?( @) N7 \1 n. L/ B- ^# E, M1 V
#include <vcl.h>
. U8 i; x- b; u#pragma hdrstop" h! G. p4 m% l0 L y. A! A# }- c5 H
! i) _; `& x: h1 r. p ]#include "Unit1.h"
0 @' ~$ v6 h: Y2 c( B. h#include "Stdlib.h"
9 L& N( ]& y/ u; V#include "Stdio.h"
; w$ n; W8 A4 G5 z#include "mathlink.h"9 w3 m* }, |+ N) j
#include "String.h": k6 O) l: u( W
static int read_and_print_expression( MLINK lp);
8 s X! D6 P1 i7 K/ g' z. |) L9 tstatic int read_and_print_atom( MLINK lp, int tag);
7 Q$ H) z0 {6 y0 c/ Q) astatic int read_and_print_function( MLINK lp);; d4 @4 u& s% o" E6 M. C8 y
//---------------------------------------------------------------------------5 j* m# n9 L3 ]- D$ K1 o! }6 t W* e6 o
#pragma package(smart_init)
3 L+ Y$ C9 s) ?7 p, j#pragma link "RzEdit"
. {$ d4 A# ^* i* H) S8 N& c#pragma resource "*.dfm"9 J7 M7 \3 P, _! m$ Y. ~
TForm1 *Form1;+ Q7 y# s: u7 o
* H$ q: T! L6 O f, H2 ?int sum;! t! n2 C; q2 S% C3 V
double tmpbackreal;
8 E r7 d: a! m XMLEnvironment env;; b& U/ z' ^- m7 V( z) A! d( e
MLINK lp;% _+ ?: W6 U6 }* }" w
int argc = 4;
1 }8 }1 L& ]' b3 ochar *argv[5] = {"-linkname",
. s! O8 \9 ?8 f: q c0 O7 k "D:\\Program Files\\Mathematica\\9.0\\mathkernel -mathlink",0 |/ q8 |* v& O. t
"-linkmode",
1 H/ _# e" l& W/ }7 p* F4 X, l "launch",6 p r2 {8 |9 M1 n+ p9 t# H( p9 G# `
NULL};: l, C9 [2 U; _; l6 @
+ R' j* G: [5 ~+ I! u: U, q8 t$ L//---------------------------------------------------------------------------% f3 C. s7 V8 m# C* H g2 r0 H
__fastcall TForm1::TForm1(TComponent* Owner)$ M! I" U2 a) J& s, U8 H- B
: TForm(Owner)6 u" U0 r* e" J1 k% ^ R Y5 C) z
{" Y' X; B2 Y' y, h0 _1 u
}
8 E7 F6 ~9 b- M1 |//---------------------------------------------------------------------------- t' O# W! E7 m6 @1 A: J! q
void __fastcall TForm1::Button1Click(TObject *Sender)" ?- t! l( u9 E5 V3 v8 k0 i1 F4 N
{
3 \& S3 c, a0 G ?3 W: a" t' } const CHAR *pOutputString;# C! g: V0 u8 q, ]
MLPutFunction(lp, "EvaluatePacket", 1);+ @7 a3 s6 y" g$ ~9 [
MLPutFunction(lp, "ToExpression", 1);: x' k9 f7 _4 s; [ G7 E
MLPutString(lp, AnsiString(Edit1->Text).c_str());3 a# J0 e; z( s# o9 a
MLEndPacket(lp);+ s5 m% G! x' N; o& G
while (MLNextPacket(lp) != RETURNPKT) MLNewPacket(lp);! w% x5 W1 N i4 J( ~5 W
read_and_print_expression(lp);
0 C! ~( L1 ~- c% c}/ v6 ~( t O' L V
//---------------------------------------------------------------------------, B& _4 p% L$ [( |: `7 x" n0 u
void __fastcall TForm1::FormCreate(TObject *Sender)7 l; [+ X% Y" ?& q4 @+ X( ^
{
3 P- ^+ w P5 k) W1 _0 f; v Edit1->Text = "Power[2,5]";
$ D% L! Y& T* W0 ~ env = MLInitialize(NULL); if(env == NULL) Edit2->Text = "出错env" ;
4 r8 e# y" C; l# y lp = MLOpen(argc, argv); if(lp == NULL) Edit2->Text = "出错lp" ;; X* E D" J O, g' E' X# k
}* K: ~1 l- W% T! `. m
//---------------------------------------------------------------------------
- k6 W8 |* Z$ R6 l- o$ w' _# `: q5 I" c" { p/ {
void __fastcall TForm1::Button2Click(TObject *Sender)
1 J. ?$ U+ h/ k; \6 v{7 j& X" ?8 k: ~5 C f! Y5 Y9 k
MLClose(lp);+ _, B, @0 [1 j5 G0 F7 r
MLDeinitialize(env);
9 ~: E; v: |* P0 H}$ h. j! y' d& ^+ l2 H' D8 U N
//---------------------------------------------------------------------------' l. Q, O( n! H" ?& a$ h1 }
static int read_and_print_expression( MLINK lp)
2 @! H% r9 l2 M5 |2 _{
( S' K, N+ }% X int tag;! x/ v2 r1 x0 ^% n# A
& J- |- P/ m" @- F9 R
switch (tag = MLGetNext( lp)) {; t8 H# i+ K! @
case MLTKSYM:
[1 N3 E) W% j! j6 ^ case MLTKSTR:
* g/ k& o" m& _7 v9 E8 H4 O0 p4 y case MLTKINT:+ B2 C1 J9 h7 F; Y: `
Form1->RzNumericEdit1->Text = tag;0 j8 J# T- ^+ m* S2 u: x* E3 ~1 v
Form1->Label1->Caption = Form1->RzNumericEdit1->Text;
7 L$ q' F) G% N: \( F) m return read_and_print_atom( lp, tag);0 H' J# o: b! o0 |3 @
case MLTKREAL:
! F: E; _0 q! @$ l2 r6 E Form1->RzNumericEdit1->Text = tag;
9 ?9 j& Z' F5 k Form1->Label1->Caption = Form1->RzNumericEdit1->Text;$ A) l; B! g! u5 g1 f2 n
return read_and_print_atom( lp, tag);2 a1 T% d$ w0 u. n3 C7 g
case MLTKFUNC:
; p) P5 @0 r6 I return (read_and_print_function( lp));, C R" K! K9 [6 S& U+ `/ s z
case MLTKERROR:2 F% M# ]' _8 j. W: J3 H. G
//case MLTKGRAF;& V; p% A( F! _: O
default:
9 w2 k8 L# y$ a+ u- P- a* p+ w* ^ return 0;- R; W% W8 B1 Y) z# n" `; g* R
}
4 `1 s/ u+ D7 H/ Z# p" R; B. @) {6 t8 r1 R
}, j8 R9 |, _0 d9 j0 f1 O& k, }
/ p. u! p0 Q1 ?# I% }1 B$ U* K
static int read_and_print_function( MLINK lp)
8 g* A* O& h$ Y{
1 O* ?1 |& O/ P" j) c int len, i;8 C: _7 C7 z9 p- f/ t6 W; a
static int indent;: t0 Y7 {, I% P% F3 I t: H
, D5 E$ K, t+ L. F% {. H2 d" u6 b if( ! MLGetArgCount( lp, &len)) return 0;* `8 n: E! c" z) w. D# O
@4 Q3 P: U) ^ I- |3 x) d
indent += 3;
# N) i" H1 E9 O& Y* E$ p printf( "\n%*.*s", indent, indent, "");/ k7 w; K0 M; V# [0 ]) R' h% M/ k- l; G
4 r! N9 R% x; b8 F7 L/ H if( read_and_print_expression( lp) == 0) return 0;6 V/ I/ J& i$ X* r
printf( "[");
7 Y& N; n0 {+ Y# ^6 _2 m7 B9 b# a- _
+ A- D" o9 V3 U2 t0 R for( i = 1; i <= len; ++i) {
3 w5 z2 O. \6 o* ` if( read_and_print_expression( lp) == 0) return 0;
+ E* e( V% p" f* ]+ }" p7 t- A if( i < len) printf( ", ");9 s# Z; V# g/ x6 l8 j6 X, o
}
; C; v2 e' {6 ]7 L: c printf( "]");* g2 O" V" A5 |! Z
indent -= 3;( F; w" W" C4 h
/ I1 k+ B2 X# @5 x
return 1;
' U% Q+ r4 r; R5 f$ W}8 t) Z# C" G a+ b, p
H- k: s) j9 K8 \+ ~2 ?" _' C' Tstatic int read_and_print_atom( MLINK lp, int tag)
( A4 ~1 V" M2 G8 A- u# ~{6 R7 [( l, Z; C) ?" w
#if MLINTERFACE >= 3
% \* W6 P! X; k' R+ P const char *s;# F4 o% x2 L* \# V
#else( N/ H, Y7 O- a; Y" l8 _* [! f
kcharp_ct s;* ^1 L' H2 m; u' J) w
#endif /* MLINTERFACE >= 3 */
6 G ?/ O H/ W& d! ]0 L) A9 c) }4 q if( tag == MLTKSTR) putchar( '"');, W! F& R8 c X/ E, v/ q g9 D
if( MLGetString( lp, &s)){
7 M$ n% c2 D4 F; g5 M //printf( "%s", s);
. `0 E& e1 ^( i: n) {# J6 p6 v Form1->Memo1->Text = AnsiString(s).c_str();* J2 j( i$ L2 m/ C
MLDisownString( lp, s);& U( ]0 O: q m9 U7 S) H) C
}
% `- k2 w* g; i) |0 R if( tag == MLTKSTR) putchar( '"');
; e0 R( {4 m( q/ [: m) m putchar( ' ');
9 X, D" s/ `& Q: c# q return MLError( lp) == MLEOK;5 D" M* x# L4 W! w& T2 K) e4 G
}# c! y$ z7 C! V& ^! B+ O/ |$ ~" g' ?
- t! Q+ [5 s& n6 S& v' Q) |/ r% o
static void error( MLINK lp)
, v- z& \( j- R5 V{/ a: s: o6 X5 \- V& b% d- @$ z
if (MLError( lp)) {
& \1 e8 B8 V) D) B6 \& H+ V fprintf( stderr, "Error detected by MathLink: %s.\n",
) x( Q( O* x6 A f1 D) f( e MLErrorMessage( lp));* O- ~8 H9 B: p R9 a
}else{, F( b: H5 X' v; E+ \( t
fprintf( stderr, "Error detected by this program.\n");
6 P/ T* g- ?' y. h- T' T) t0 ^3 X }
- Y+ [1 o, F5 {. s, _ exit( 1);
+ F d( F" r2 H/ {4 `; R; [}, t0 ^, x! B/ ^/ n
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