📄 问专家-matlab与c++的接口问题.htm
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string rather than \0 <BR> *
<BR> * For more complicated cases, use any string with
whitespace, <BR> * and that string will be executed
literally to start MATLAB. <BR> */
<BR> if (!(ep = engOpen("\0"))) {
<BR> fprintf(stderr, "\nCan't start MATLAB engine\n");
<BR> return EXIT_FAILURE; <BR> }
/*启动MATLAB引擎*/ <BR> /* <BR> * PART
I <BR> * <BR> * For the first half
of this demonstration, we will send data <BR> * to
MATLAB, analyze the data, and plot the result. <BR> */
<BR> /* <BR> /*
<BR> * Create a variable for our data.
<BR> */ <BR> T =
mxCreateDoubleMatrix(1, 10, mxREAL); /*创建一个矩阵*/
<BR> mxSetName(T, "T"); /*设置矩阵的名字为“T”*/
<BR> memcpy((void *)mxGetPr(T), (void *)time,
sizeof(time)); /*向矩阵“T”赋值*/ <BR> /*
<BR> * 把矩阵“T”置入MATLAB引擎 <BR> */
<BR> engPutArray(ep, T) <BR> /*
<BR> * Evaluate a function of time, distance =
(1/2)g.*t.^2 <BR> * (g is the acceleration due to
gravity). <BR> */
<BR> engEvalString(ep, "D = .5.*(–9.8).*T.^2;");
/*执行MATLAB <BR> 命令：D = .5.*(–9.8).*T.^2；*/
<BR> /* <BR> * 绘制图象.
<BR> */ <BR> engEvalString(ep,
"plot(T,D);"); /*执行MATLAB命令：绘图*/ <BR> engEvalString(ep,
"title('Position vs. Time for a falling <BR> object');");
/*执行MATLAB命令：给图象加标题*/ <BR> engEvalString(ep,
"xlabel('Time (seconds)');"); /*执行MATLAB命令：设置X轴坐标*/
<BR> engEvalString(ep, "xlabel('Time (seconds)');");
/*执行MATLAB命令：设置X轴坐标*/ <BR> engEvalString(ep,
"ylabel('Position (meters)');"); /*执行MATLAB命令：设置Y轴
<BR> 坐标*/ <BR> /*
<BR> * Use fgetc() to make sure that we pause long enough
to be <BR> * able to see the plot.
<BR> */ <BR> printf("Hit return to
continue\n\n"); <BR> fgetc(stdin);
<BR> /* <BR> * We're done for Part
I! Free memory, close MATLAB engine. <BR> */
<BR> printf("Done for Part I.\n");
<BR> mxDestroyArray(T); /*从内存中撤销矩阵“T”*/
<BR> engEvalString(ep, "close;"); /*关闭刚才显示图象的窗口*/
<BR> /* <BR> * PART II
<BR> * <BR> * For the second half
of this demonstration, we will request <BR> * a MATLAB
string, which should define a variable X. MATLAB <BR> *
will evaluate the string and create the variable. We
<BR> * will then recover the variable, and determine its
type. <BR> */ <BR> */
<BR> /* <BR> * Use engOutputBuffer
to capture MATLAB output, so we can <BR> * echo it back.
<BR> */ <BR> engOutputBuffer(ep,
buffer, BUFSIZE); /*构建MATLAB文本输入缓冲区*/ <BR> while (result
== NULL) { <BR> char str[BUFSIZE];
<BR> /* <BR> * Get a string input
from the user. <BR> */ <BR>
printf("Enter a MATLAB command to evaluate. This <BR>
command should\n"); <BR> printf("create a variable X.
This program will then <BR> determine\n");
<BR> printf("what kind of variable you created.\n");
<BR> printf("For example: X = 1:5\n");
<BR> printf(">> "); /*要求用户输入一个MATLAB命令*/
<BR> fgets(str, BUFSIZE–1, stdin); /*获得用户输入*/
<BR> /* <BR> * Evaluate input with
engEvalString. <BR> */ <BR>
engEvalString(ep, str); /*执行用户输入的MATLAB命令*/ <BR>
engEvalString(ep, str); /*执行用户输入的MATLAB命令*/ <BR> /*
<BR> * Echo the output from the command. First two
characters <BR> * are always the double prompt
(>>). <BR> */ <BR>
printf("%s", buffer+2); /*显示该MATLAB命令的执行情况*/ <BR> /*
<BR> * Get result of computation.
<BR> */ <BR> printf("\nRetrieving
X...\n"); <BR> if ((result = engGetArray(ep,"X")) ==
NULL) /*判断是否可以从MATLAB <BR> 引擎中获得矩阵“X”*/
<BR> printf("Oops! You didn't create a variable
X.\n\n"); <BR> else <BR>
printf("X is class %s\t\n", mxGetClassName(result)); /*显示矩阵“X”
<BR> 的类型*/ <BR>
<BR> } /* while(result==NULL)*/
<BR> /* <BR> * We're done! Free
memory, close MATLAB engine and exit. <BR> */
<BR> printf("Done!\n");
<BR> mxDestroyArray(result); /*从内存中撤销矩阵“T”*/
<BR> engClose(ep); /*关闭MATLAB引擎*/
<BR> return EXIT_SUCCESS; /*返回*/
<BR> } <BR> 4、引擎应用程序的编译
<BR> 对于象上例中的控制台程序，可以在MATLAB命令行中直接使用带-f参数的mex命令编译。
<BR> 如果在普通win32
application中使用MATLAB引擎，情况则比较复杂。在Windows中，MATLAB引擎是通过ActiveX被调用的。因此你需要先Create一个OLE
Automation Sever和一个OLE Client，然后通过OLE方式调用这个MATLAB引擎。具体做法可参阅相关MATLAB随机文档。
<BR> 5、总结
<BR> MATLAB引擎的调用与其它引擎（例如数据库引擎）的调用很类似，其步骤是联接\启动引擎，然后向引擎发送命令，获得引擎处理结果。
<BR> <BR> 结束语
<BR> 上面简要介绍了MATLAB与C++的几种接口方式，我们可以根据要求的不同采用相应的方式。
<BR> 此外，MATLAB还提供了一个数学库，由此数学库，我们可以获得对MATLAB内部命令更多的访问权和更灵活的访问方式。具体内容可参考MATLAB的相关随机文档。
<BR> ·参考文献 <BR>
1、MATLAB随机文档：apiguide.pdf <BR> 2、MATLAB随机文档：apiref.pdf
<BR> 3、MATLAB随机文档：c_math_ref1.pdf
<BR> ·致谢
<BR> 感谢loverboy的鼓励，他声称要把这些帖子放到他的主页上，才使得我能够在短时间完成这篇接口问题的文章，西西。
<BR> ·备注 <BR>
mex编译器在VC6下的设置可参阅本板19#文 <BR> <B><IMG
src="问专家-MATLAB与C++的接口问题.files/seashell.gif">Bluesky的意见：</B>
<BR> VC程序员最好用visual matcom。VB用matrixVB
mathtool在主页上提供免费试用，快去下吧。matlab的功能可在你的VC,VB中实现，而且只需两个dll即可发行。
<BR> <BR> <B><IMG
src="问专家-MATLAB与C++的接口问题.files/links.gif">相关问题：</B>
<BR> <A
href="http://www.china-askpro.com/msg27/qa10.shtml" target=_blank>QA002610
"关于MatLab的站点"</A></FONT>
<P><FONT size=-1><I>文章来源：<B>Sirius (天狼星)</B>。</I> <!--#include virtual="../QuestionFooter.html" --></FONT></P></BODY></HTML>
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