C中訪問Matlab數據文件Mat的方式：
mat數據格式是matlab的數據存儲的標準格式。
(1)首先將Mat.h所在的includes文件夾加到Vs2005的include配置中：
Tools-Options-Projects and Solutions-VC++ Directories
在show derectories for:中選擇includes file
將Matlab安裝目錄下的extern/include添加到其中。
(2)#include<mat.h>
(3)常見函數：
matopen 打開mat文件
matclose 關閉mat文件
magetfp 取得mat文件的c語言句柄
matGetArray 取得一個數組
/*
* Open a MAT-file "filename" using mode "mode". Return
* a pointer to a MATFile for use with other MAT API functions.
*
* Current valid entries for "mode" are
* "r" == read only.
* "w" == write only (deletes any existing file with name <filename>).
* "w4" == as "w", but create a MATLAB 4.0 MAT-file.
* "w7.3" == as "w", but create a MATLAB 7.3 MAT-file.
* "u" == update. Read and write allowed, existing file is not deleted.
*
* Return NULL if an error occurs.
*/
EXTERN_C MATFile * matOpen(const char *filename, const char * mode);
/*
* Close a MAT-file opened with matOpen.
*
* Return zero for success, EOF on error.
*/
EXTERN_C int matClose(MATFile *pMF);
/*
* Write array value with the specified name to the MAT-file, deleting any
* previously existing variable with that name in the MAT-file.
*
* Return zero for success, nonzero for error.
*/
EXTERN_C int matPutVariable(
MATFile * pMF,
const char * name,
const mxArray * pA
);
/*
* Read the array value for the specified variable name from a MAT-file.
*
* Return NULL if an error occurs.
*/
EXTERN_C mxArray * matGetVariable(MATFile * pMF, const char * name);