C++调用MATLAB引擎

keehoo

这是MATLAB自带的例子，我在WindowsXP(SP2), MATLAB R2007b, VC6.0下实现。

具体的步骤是：

1). 设置系统环境变量path，path里面要包括MATLAB的exe, dll那个路径

%MATLAB_PATH%\bin\win32

只要MATLAB是正确安装，它应该会自动配置path环境变量的。

右击我的电脑－>属性－>高级－>环境变量－>系统变量

双击path

path值应该有以下两个值，中间是分号

d:\MATLABR2007b\bin;d:\MATLABR2007b\bin\win32

2). 设置VC的路径

运行VC,转到options

include增加MATLAB的include路径 %MATLAB_PATH%\extern\include

lib增加%MATLAB_PATH%\extern\lib\win32\microsoft

这一步以后都不用做了。

3). 在VC中新建一个console项目（也可以是win32,mfc等其他项目），项目的link输入增加libeng.lib和libmx.lib（每个工程都要添加，否则编译不能通过）

4). main函数的代码：

1. /* $Revision: 1.8.4.1 $ */
   
2. /*
   
3. * engdemo.c
   
4. *
   
5. * This is a simple program that illustrates how to call the MATLAB
   
6. * Engine functions from a C program.
   
7. *
   
8. * Copyright 1984-2003 The MathWorks, Inc.
   
9. * All rights reserved
   
10. */
    
11. #include <stdlib.h>
    
12. #include <stdio.h>
    
13. #include <string.h>
    
14. #include "engine.h"
    
15. #define BUFSIZE 256
    
16. 
    
17. int main()
    
18. 
    
19. {
    
20. Engine *ep;
    
21. mxArray *T = NULL, *result = NULL;
    
22. char buffer[BUFSIZE+1];
    
23. double time[10] = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 };
    
24. 
    
25. /*
    
26. * Start the MATLAB engine locally by executing the string
    
27. * "matlab"
    
28. *
    
29. * To start the session on a remote host, use the name of
    
30. * the host as the string rather than \0
    
31. *
    
32. * For more complicated cases, use any string with whitespace,
    
33. * and that string will be executed literally to start MATLAB
    
34. */
    
35. if (!(ep = engOpen("\0"))) {
    
36.    fprintf(stderr, "\nCan't start MATLAB engine\n");
    
37.    return EXIT_FAILURE;
    
38. }
    
39. 
    
40. /*
    
41. * PART I
    
42. *
    
43. * For the first half of this demonstration, we will send data
    
44. * to MATLAB, analyze the data, and plot the result.
    
45. */
    
46. 
    
47. /*
    
48. * Create a variable for our data
    
49. */
    
50. T = mxCreateDoubleMatrix(1, 10, mxREAL);
    
51. memcpy((void *)mxGetPr(T), (void *)time, sizeof(time));
    
52. /*
    
53. * Place the variable T into the MATLAB workspace
    
54. */
    
55. engPutVariable(ep, "T", T);
    
56. 
    
57. /*
    
58. * Evaluate a function of time, distance = (1/2)g.*t.^2
    
59. * (g is the acceleration due to gravity)
    
60. */
    
61. engEvalString(ep, "D = .5.*(-9.8).*T.^2;");
    
62. 
    
63. /*
    
64. * Plot the result
    
65. */
    
66. engEvalString(ep, "plot(T,D);");
    
67. engEvalString(ep, "title('Position vs. Time for a falling object');");
    
68. engEvalString(ep, "xlabel('Time (seconds)');");
    
69. engEvalString(ep, "ylabel('Position (meters)');");
    
70. 
    
71. /*
    
72. * use fgetc() to make sure that we pause long enough to be
    
73. * able to see the plot
    
74. */
    
75. printf("Hit return to continue\n\n");
    
76. fgetc(stdin);
    
77. /*
    
78. * We're done for Part I! Free memory, close MATLAB engine.
    
79. */
    
80. printf("Done for Part I.\n");
    
81. mxDestroyArray(T);
    
82. engEvalString(ep, "close;");
    
83. 
    
84. 
    
85. /*
    
86. * PART II
    
87. *
    
88. * For the second half of this demonstration, we will request
    
89. * a MATLAB string, which should define a variable X. MATLAB
    
90. * will evaluate the string and create the variable. We
    
91. * will then recover the variable, and determine its type.
    
92. */
    
93.    
    
94. /*
    
95. * Use engOutputBuffer to capture MATLAB output, so we can
    
96. * echo it back. Ensure first that the buffer is always NULL
    
97. * terminated.
    
98. */
    
99. 
    
100. buffer[BUFSIZE] = '\0';
     
101. engOutputBuffer(ep, buffer, BUFSIZE);
     
102. while (result == NULL) {
     
103.      char str[BUFSIZE+1];
     
104.      /*
     
105.       * Get a string input from the user
     
106.       */
     
107.      printf("Enter a MATLAB command to evaluate. This command should\n");
     
108.      printf("create a variable X. This program will then determine\n");
     
109.      printf("what kind of variable you created.\n");
     
110.      printf("For example: X = 1:5\n");
     
111.      printf(">> ");
     
112. 
     
113.      fgets(str, BUFSIZE, stdin);
     
114.    
     
115.      /*
     
116.       * Evaluate input with engEvalString
     
117.       */
     
118.      engEvalString(ep, str);
     
119.      
     
120.      /*
     
121.       * Echo the output from the command. First two characters are
     
122.       * always the double prompt (>>).
     
123.       */
     
124.      printf("%s", buffer+2);
     
125.      
     
126.      /*
     
127.       * Get result of computation
     
128.       */
     
129.      printf("\nRetrieving X...\n");
     
130.      if ((result = engGetVariable(ep,"X")) == NULL)
     
131.        printf("Oops! You didn't create a variable X.\n\n");
     
132.      else {
     
133.    printf("X is class %s\t\n", mxGetClassName(result));
     
134.      }
     
135. }
     
136. 
     
137. /*
     
138. * We're done! Free memory, close MATLAB engine and exit.
     
139. */
     
140. printf("Done!\n");
     
141. mxDestroyArray(result);
     
142. engClose(ep);
     
143. 
     
144. return EXIT_SUCCESS;
     
145. }
     
146. 
     

复制代码

编译运行，等一会儿会有一个MATLAB图形窗口弹出。

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