我目前正在将一些代码从Matlab移植到Octave . Matlab代码的一些功能使用Piotr的计算机视觉Matlab工具箱(here),其中包括一些mex文件 . 在Matlab中,一切都像魅力一样,但是当我用Octave运行我的代码时,它会抛出这个错误:
error: 'imResampleMex' undefined near line 50 column 5
但是,工具箱中的所有内部路径都应该是好的 . 我发现Matlab和Octave处理mex文件的方式不同,并试图在Octave中构建一个来自C函数的mex文件,如下所示:
mkoctfile --mex imResampleMex.cpp
它失败并抛出以下与C包装函数相关的错误消息:
In file included from imResampleMex.cpp:6:0:
wrappers.hpp:21:24: error: 'wrCalloc' declared as an 'inline' variable
inline void* wrCalloc( size_t num, size_t size ) { return calloc(num,size);
^
wrappers.hpp:21:24: error: 'size_t' was not declared in this scope
wrappers.hpp:21:36: error: 'size_t' was not declared in this scope
inline void* wrCalloc( size_t num, size_t size ) { return calloc(num,size);
^
wrappers.hpp:21:48: error: expression list treated as compound expression in initializer [-fpermissive]
inline void* wrCalloc( size_t num, size_t size ) { return calloc(num,size);
^
wrappers.hpp:21:50: error: expected ',' or ';' before '{' token
inline void* wrCalloc( size_t num, size_t size ) { return calloc(num,size);
^
wrappers.hpp:22:24: error: 'wrMalloc' declared as an 'inline' variable
inline void* wrMalloc( size_t size ) { return malloc(size); }
^
wrappers.hpp:22:24: error: 'size_t' was not declared in this scope
wrappers.hpp:22:38: error: expected ',' or ';' before '{' token
inline void* wrMalloc( size_t size ) { return malloc(size); }
^
wrappers.hpp: In function 'void wrFree(void*)':
wrappers.hpp:23:44: error: 'free' was not declared in this scope
inline void wrFree( void * ptr ) { free(ptr); }
^
wrappers.hpp: At global scope:
wrappers.hpp:28:17: error: 'size_t' was not declared in this scope
void* alMalloc( size_t size, int alignment ) {
^
wrappers.hpp:28:30: error: expected primary-expression before 'int'
void* alMalloc( size_t size, int alignment ) {
^
wrappers.hpp:28:44: error: expression list treated as compound expression in initializer [-fpermissive]
void* alMalloc( size_t size, int alignment ) {
^
wrappers.hpp:28:46: error: expected ',' or ';' before '{' token
void* alMalloc( size_t size, int alignment ) {
^
imResampleMex.cpp: In function 'void resampleCoef(int, int, int&, int*&, int*&, T*&, int*, int)':
imResampleMex.cpp:21:39: error: 'alMalloc' cannot be used as a function
wts = (T*)alMalloc(nMax*sizeof(T),16);
^
imResampleMex.cpp:22:43: error: 'alMalloc' cannot be used as a function
yas = (int*)alMalloc(nMax*sizeof(int),16);
^
imResampleMex.cpp:23:43: error: 'alMalloc' cannot be used as a function
ybs = (int*)alMalloc(nMax*sizeof(int),16);
^
imResampleMex.cpp: In function 'void resample(T*, T*, int, int, int, int, int, T)':
imResampleMex.cpp:48:43: error: 'alMalloc' cannot be used as a function
T *C = (T*) alMalloc((ha+4)*sizeof(T),16); for(y=ha; y<ha+4; y++) C[y]=0;
^
warning: mkoctfile: building exited with failure status
wrappers.hpp文件看起来像这样:
#ifndef _WRAPPERS_HPP_
#define _WRAPPERS_HPP_
#ifdef MATLAB_MEX_FILE
// wrapper functions if compiling from Matlab
#include "mex.h"
inline void wrError(const char *errormsg) { mexErrMsgTxt(errormsg); }
inline void* wrCalloc( size_t num, size_t size ) { return mxCalloc(num,size); }
inline void* wrMalloc( size_t size ) { return mxMalloc(size); }
inline void wrFree( void * ptr ) { mxFree(ptr); }
#else
// wrapper functions if compiling from C/C++
inline void wrError(const char *errormsg) { throw errormsg; }
inline void* wrCalloc( size_t num, size_t size ) { return calloc(num,size); }
inline void* wrMalloc( size_t size ) { return malloc(size); }
inline void wrFree( void * ptr ) { free(ptr); }
#endif
// platform independent aligned memory allocation (see also alFree)
void* alMalloc( size_t size, int alignment ) {
const size_t pSize = sizeof(void*), a = alignment-1;
void *raw = wrMalloc(size + a + pSize);
void *aligned = (void*) (((size_t) raw + pSize + a) & ~a);
*(void**) ((size_t) aligned-pSize) = raw;
return aligned;
}
// platform independent alignned memory de-allocation (see also alMalloc)
void alFree(void* aligned) {
void* raw = *(void**)((char*)aligned-sizeof(void*));
wrFree(raw);
}
#endif
我想我需要修改这个文件,但是我对C和mex文件的知识几乎不存在,我正在努力想办法摆脱这一堆错误 . 我甚至不知道我是否朝着正确的方向前进......欢迎任何帮助!
Edit 1:
我修改了我的wrappers.hpp文件,添加了 #include <stdlib.h>
. 现在创建了一个mex文件 . 但是,当运行调用该文件的函数时,我现在收到以下错误:
error: failed to install .mex file function 'imResampleMex'
error: called from
imResample at line 50 column 4
1 回答
以下是我用来解决从Piotr的计算机视觉Matlab工具箱中为Octave创建mex文件的问题的步骤(仅涉及文件夹
channels
的cpp文件) .工具箱附带的原始mex文件是为Matlab构建的,不适用于Octave . 从Octave构建它们时,会调用文件
wrappers.hpp
. 必须通过在文件开头添加这两行来修改此文件:#include <stdlib.h>
和#include "mex.h"
.要构建mex文件,请在Octave提示符类型中(当位于cpp文件的目录中时):
这样就创建了Octave兼容的mex文件 .
编辑23/05/2017 - 在收到生成这些文件时出现问题的人的更多问题后,我在Github上发布了生成的文件:https://github.com/Eskapp/Piotr_vision_extrafiles_Octave . 随意使用它们 . 您需要手动将它们添加到Computer Vision工具箱中 .