我正在将一个mat
文件导入到我的C++代码中。在导入数据,执行计算并保存到另一个位置后,我想释放原始数据占用的内存。
是否有任何特定的函数来执行这个操作?只删除mxGetData()
返回的指针会释放内存吗?
这是我创建的用于导入mat文件的类。
#ifndef READMAT_H
#define READMAT_H
#include "mat.h"
#include "matrix.h"
#include "mex.h"
#include "program_exception.h"
#include "stdint.h"
class readmat
{
private:
const size_t *dimarray;
const char **dir;
MATFile *pmat;
int ndir;
mxArray *painfo,*pa;
const char *file;
int minute;
int second;
const char *name;
const char *name1;
bool isdouble;
no_mat_exception noMAT;
public:
//with default value
readmat(const char *f);
// get number of dimensions
int getnumbrofdimensions() const;
// get pointer to array
void* getarraypointer() const;
// get pointer to each dimension size
const size_t* dimensionpointer() const;
//number of elements
int numberofelements() const;
~readmat();
};
#endif
以下是CPP实现。
#include "readmat.h"
#include <iostream>
#include "mat.h"
#include "matrix.h"
#include "mex.h"
using namespace std;
// set the file name
readmat::readmat(const char *f)
{
file = f;
pmat = matOpen(file, "r");
if (pmat == NULL) {
throw noMAT;
}
else
{
dir = (const char **)matGetDir(pmat, &ndir);
if (dir == NULL) {
printf("Error reading directory of file %s\n", file);
}
else if (ndir > 1)
{
cout << "The number of variables are larger than 1" << endl;
}
else
{
mxFree(dir);
matClose(pmat);
pmat = matOpen(file, "r");
if (pmat == NULL) {
throw noMAT;
}
else
{
painfo = matGetNextVariableInfo(pmat, &name);
matClose(pmat);
}
pmat = matOpen(file, "r");
if (pmat == NULL) {
throw noMAT;
}
else
{
pa = matGetNextVariable(pmat, &name1);
matClose(pmat);
}
}
}
}
int readmat::getnumbrofdimensions() const
{
return mxGetNumberOfDimensions(painfo);
}
void* readmat::getarraypointer() const
{
//return mxGetPr(pa);
return mxGetData(pa);
}
const size_t* readmat::dimensionpointer() const
{
return mxGetDimensions(painfo);
}
int readmat::numberofelements() const
{
return mxGetNumberOfElements(painfo);
}
readmat::~readmat()
{
mxFree(pa);
mxFree(painfo);
}
在这里,当我删除对象时,程序会在文件free.c中触发一个断点。
mxFree((void*)pa)
吗?但是请注意,如果你释放了内存,你将不再拥有数据。 - Ander Biguri