mexhandle
所属分类：matlab编程
开发工具：Visual C++
文件大小：5KB
下载次数：4
上传日期：2006-12-08 00:59:45
上 传 者：
sunxiaodian
说明： you can pass C++ objects between different MEX functions without first converting to a MatLab compatible format
(you can pass objects between different C ME X functions without first converting to a MatLa b compatible format)
文件列表:
mex_create.cpp (259, 2004-05-13)
mex_destroy.cpp (234, 2004-05-13)
mex_handletest.cpp (1741, 2004-10-21)
ObjectHandle.h (6051, 2004-10-21)
MatLab MEX ObjectHandle
--------------------------
This utility allows you to create a C++ object within a mex-file and
to pass a handle to this object back to MatLab. Thus, you can pass C++
objects between different MEX functions without first converting to
a MatLab compatible format.
Basic Usage
-----------
The ObjectHandle comes with a set of wrapper functions, which simplify
the common case.
template
mxArray *create_handle(T* t);
template
T& get_object(const mxArray *mxh);
template
void destroy_object(const mxArray *mxh);
These are demonstrated in mex_handletest.cpp.
More Advanced Usage
-------------------
To provide more control over the C++ object being handled, can use ObjectHandle
directly. These operations are also demonstrated in mex_handletest.cpp.
A particular use is to pass a static object to a handle. eg,
static MyObject obj;
ObjectHandle *objh = new ObjectHandle(obj);
mxArray *mex_handle = objh->to_mex_handle();
In the above case, since obj is passed as a reference, the ObjectHandle does
*not* own obj, and will not automatically destroy it.
Examples
--------
1. mex_handletest.cpp
Simple example where a C++ object is handed back and forth between a single
mex-dll. The mex-function is passed a flag to indicate what operation is to
be carried out.
If the user calls 'clear all' or 'clear mex' or 'clear functions' from within
MatLab, the C++ object is destroyed automatically, and the handle ceases to
be valid.
2. mex_create.cpp and mex_destroy.cpp
An simple example where a C++ object is created in one mex-dll and passed to
another, where it is destroyed. (See "known issues" below.) Again, the object
is destroyed automatically if the dll is cleared.
Known Issues
------------
Some memory models with MSVC++ appear to cause problems with this utility.
Specifically, to pass a handle from one MEX-dll to another, the dlls *must*
share a common address-space. Make sure that your MEX setup uses appropriate
run-time configuration to ensure shared address-space.
Note, if you are simply passing a C++ object back-and-forth between MatLab and
a single MEX-dll, then there is no problem.
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