这篇文章的参考资料：
[1] http://www.mathworks.com/matlabcentral/newsreader/view_thread/278243 “使 C++ 对象在 mex 调用之间持久化，并且健壮。”
[2] MATLAB parfor 和 C++ 类 mex 包装器（需要复制构造函数？） “MATLAB parfor 和 C++ 类 mex 包装器（需要复制构造函数？）”
我成功地实现了一个 Matlab/C++ 接口，基于 [1] 中提出的方法。无论如何，我在尝试将系统与 Matlab 并行计算一起使用时遇到了麻烦。
在 MEX 接口中尝试在 matlab 句柄和 C++ 指针之间进行转换时，发生在我身上的是分段错误。
为了更清楚，我将回顾 [1] 中提出的结构。系统中有三个文件，采用这种通信方案：
[myInterface.m] <--> [myMexInterface.cpp] <--> [myClass.cpp]
在哪里
- myInterface.m 是一个 matlab 类
- myMexInterface.cpp 是一个 C++ (mex) 函数
- myClass.cpp 是一个 C++ (mex) 类
该系统的使用分为两个阶段：
- 构造：创建一个matlab对象myInterface。这会导致调用 myMexInterface.mexa64，从而调用 C++ myClass 对象的创建。myClass 的 C++ 指针通过 myMexInterface.mexa64 发送回 myInterface，存储它以供进一步使用。特别是，myMexInterface.mexa64 将myClass 的 C++ 指针转换为 matlab 句柄。
- 使用 matlab 中的 C++ 类：myInterface 向客户端提供方法，这些方法通过 myMexInterface.mexa64 传递，调用对象 myClass 上的函数。在此阶段，myMexInterface.mexa64 需要在构造阶段从 myInterface 存储的句柄才能调用正确 C++ 对象上的函数。当然，在这个阶段 myMexInterface.mexa64 会进行反向转换，从 Matlab 句柄到 C++ 指针。
在我的实现中，它在单线程中工作，在从句柄到指针的转换过程中会出现分段错误错误。特别是，我想关注 myMexInterface.cpp。要执行的命令通过字符串作为第一个参数传递，而可能（对于第二阶段操作）第二个参数是相对于与该接口关联的 C++ 对象的 matlab 句柄。
#include "mex.h"
#include "class_handle.hpp"
CLASS void myMexInterface(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
if (!strcmp("new", cmd)) {
// ...
plhs[0] = convertPtr2Mat<myClass>(new myClass());
}
if (!strcmp("delete", cmd)) {
// ...
destroyObject<myClass>(prhs[1]);
}
// Get the class instance pointer from the second input
cout << " trying to convert handle...";
myClass *myClass_instanceAddress = convertMat2Ptr<myClass>(prhs[1]); // SEGMENTATION FAULT ON MULTI CORE!!!
cout << " success in handle conversion. \n";
if (!strcmp("aFunction", cmd)) {
myClass_instanceAddress->aFunction();
}
// .. other functions
}
生成段错误的函数 convertMat2Pt 来自包含 class_handle.hpp，这是 [1] 中提出的解决方案的一部分。特别是那个class_handle.hpp中的函数，其中段错误是convertMat2HandlePtr：
template<class base> class class_handle
// ...
template<class base> inline class_handle<base> *convertMat2HandlePtr(const mxArray *in)
{
if (mxGetNumberOfElements(in) != 1 || mxGetClassID(in) != mxUINT64_CLASS || mxIsComplex(in))
mexErrMsgTxt("Input must be a real uint64 scalar.");
std::cout << "class_handle: trying to cast \n";
class_handle<base> *ptr = reinterpret_cast<class_handle<base> *>(*((uint64_t *)mxGetData(in))); // SEGMENTATION FAULT ON MULTI CORE!!!
if (!ptr->isValid())
mexErrMsgTxt("Handle not valid.");
return ptr;
}
template<class base> inline base *convertMat2Ptr(const mxArray *in)
{
return convertMat2HandlePtr<base>(in)->ptr();
}
// ...
实际上我不清楚那个演员阵容中到底发生了什么，所以我无法进行更深入的分析。我可以想象的是，由于某种原因，Matlab 并行计算与之前创建的 C++ 对象产生了不一致。
生成段错误的matlab客户端函数如下：
myInterface = myMexInterface();
matlabpool open local 1
out = myModelInterf.aFunction()
disp(' Now starting parfor ***');
parfor i = 1:1
out = myModelInterf.aFunction()
end
注意，为了简化情况，我在matlabpool中只打开了一个worker，parfor只执行了一个循环：反正我还是有错误。当然，如果没有 parfor 块，即使多次调用 aFunction()，也不会出错。
我在命令窗口中获得的是：
Create interface with CPP handle: 139698584223104
Starting matlabpool using the 'local' profile ... connected to 1 workers.
trying to convert handle...class_handle: trying to cast
success in handle conversion.
out =
3
Now starting parfor ***
Save interface with CPP handle: 139698584223104
Save interface with CPP handle: 139698584223104
Create interface with CPP handle: 0
Load interface with CPP handle: 139698584223104
trying to convert handle...class_handle: trying to cast
------------------------------------------------------------------------
Segmentation violation detected at Wed Jan 30 15:00:47 2013
------------------------------------------------------------------------
Configuration:
Crash Decoding : Disabled
Current Visual : None
Default Encoding: UTF-8
GNU C Library : 2.15 stable
MATLAB Root : /usr/local/MATLAB/R2012b
MATLAB Version : 8.0.0.783 (R2012b)
Operating System: Linux 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64
Processor ID : x86 Family 6 Model 42 Stepping 7, GenuineIntel
Virtual Machine : Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
Window System : No active display
Fault Count: 1
Abnormal termination:
Segmentation violation
Register State (from fault):
RAX = 00007fedbcba74a0 RBX = 00007fee2afa0fe0
RCX = 0000000000000006 RDX = 0000000000000060
RSP = 00007fee2afa0520 RBP = 00007fee2afa09f0
RSI = 0000000000000000 RDI = 00007fee2b817a50
R8 = 00007fee2afa09af R9 = 00007fedbcdb9208
R10 = 00007fee2afa0200 R11 = 00007fee3d57ba00
R12 = 0000000000000002 R13 = 00007f0e1c7cfd80
R14 = 00007fee2afa0dd0 R15 = 00007fee2afa0f20
RIP = 00007fedfc00a8e4 EFL = 0000000000010206
CS = 0033 FS = 0000 GS = 0000
Stack Trace (from fault):
[ 0] 0x00007fee3f5e31de /usr/local/MATLAB/R2012b/bin/glnxa64/libmwfl.so+00516574 _ZN2fl4diag15stacktrace_base7captureERKNS0_14thread_contextEm+000158
[ 1] 0x00007fee3f5e44b2 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwfl.so+00521394
[ 2] 0x00007fee3f5e5ffe /usr/local/MATLAB/R2012b/bin/glnxa64/libmwfl.so+00528382 _ZN2fl4diag13terminate_logEPKcRKNS0_14thread_contextE+000174
[ 3] 0x00007fee3e8d2093 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00557203 _ZN2fl4diag13terminate_logEPKcPK8ucontext+000067
[ 4] 0x00007fee3e8ceb9d /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00543645
[ 5] 0x00007fee3e8d0835 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00550965
[ 6] 0x00007fee3e8d0a55 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00551509
[ 7] 0x00007fee3e8d10fe /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00553214
[ 8] 0x00007fee3e8d1295 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00553621
[ 9] 0x00007fee3cdc8cb0 /lib/x86_64-linux-gnu/libpthread.so.0+00064688
[ 10] 0x00007fedfc00a8e4 /home/gwala/Documents/mexInitConfig/mex_torque_profile.mexa64+00010468 mexFunction+002116
[ 11] 0x00007fee355b269a /usr/local/MATLAB/R2012b/bin/glnxa64/libmex.so+00112282 mexRunMexFile+000090
[ 12] 0x00007fee355ae4e9 /usr/local/MATLAB/R2012b/bin/glnxa64/libmex.so+00095465
[ 13] 0x00007fee355af33c /usr/local/MATLAB/R2012b/bin/glnxa64/libmex.so+00099132
[ 14] 0x00007fee3e620a4b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00596555 _ZN8Mfh_file11dispatch_fhEiPP11mxArray_tagiS2_+000539
[ 15] 0x00007fee3deb4e56 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02264662
[ 16] 0x00007fee3de651c6 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01937862
[ 17] 0x00007fee3de69ab4 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01956532
[ 18] 0x00007fee3de660d3 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01941715
[ 19] 0x00007fee3de66ed7 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01945303
[ 20] 0x00007fee3ded2760 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02385760
[ 21] 0x00007fee3e620a4b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00596555 _ZN8Mfh_file11dispatch_fhEiPP11mxArray_tagiS2_+000539
[ 22] 0x00007fee35b73538 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcos.so+01574200
[ 23] 0x00007fee35b15232 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcos.so+01188402
[ 24] 0x00007fee35b154ce /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcos.so+01189070
[ 25] 0x00007fee35b1723c /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcos.so+01196604
[ 26] 0x00007fee35bfc9c7 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcos.so+02136519
[ 27] 0x00007fee3e5d6431 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00291889 _ZN13Mfh_MATLAB_fn11dispatch_fhEiPP11mxArray_tagiS2_+000529
[ 28] 0x00007fee3deb4933 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02263347
[ 29] 0x00007fee3dec40d8 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02326744
[ 30] 0x00007fee3dec7038 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02338872
[ 31] 0x00007fee3de6ab18 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01960728
[ 32] 0x00007fee3de660d3 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01941715
[ 33] 0x00007fee3de66ed7 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01945303
[ 34] 0x00007fee3ded2760 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02385760
[ 35] 0x00007fee3e62053b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00595259 _ZN8Mfh_file11dispatch_fhEP20_mdUnknown_workspaceiPP11mxArray_tagiS4_+000555
[ 36] 0x00007fee3e5e3057 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00344151 _Z30callViamdMxarrayFunctionHandlePviPP11mxArray_tagiS2_+000039
[ 37] 0x00007fee3de3e143 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01777987
[ 38] 0x00007fee3de3f07d /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01781885
[ 39] 0x00007fee3de3f78b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01783691
[ 40] 0x00007fee3de42759 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01795929
[ 41] 0x00007fee3de6922b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01954347
[ 42] 0x00007fee3de660d3 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01941715
[ 43] 0x00007fee3de66ed7 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01945303
[ 44] 0x00007fee3ded2760 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02385760
[ 45] 0x00007fee3e62053b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00595259 _ZN8Mfh_file11dispatch_fhEP20_mdUnknown_workspaceiPP11mxArray_tagiS4_+000555
[ 46] 0x00007fee3e5e3057 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00344151 _Z30callViamdMxarrayFunctionHandlePviPP11mxArray_tagiS2_+000039
[ 47] 0x00007fee3ddf38b5 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01472693 inFullFevalFcn+001045
[ 48] 0x00007fee3e5e66ba /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00358074 _ZN11Mfh_builtin11dispatch_mfEiPP11mxArray_tagiS2_+000074
[ 49] 0x00007fee3e5d6431 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00291889 _ZN13Mfh_MATLAB_fn11dispatch_fhEiPP11mxArray_tagiS2_+000529
[ 50] 0x00007fee3e0a1140 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+04280640
[ 51] 0x00007fee3e0a197a /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+04282746
[ 52] 0x00007fee3e0a24ea /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+04285674
[ 53] 0x00007fee3df054cd /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02593997
[ 54] 0x00007fee3df30d22 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02772258
[ 55] 0x00007fee3df30e4f /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02772559
[ 56] 0x00007fee3e04db30 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+03939120
[ 57] 0x00007fee3de69fec /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01957868
[ 58] 0x00007fee3de660d3 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01941715
[ 59] 0x00007fee3de66ed7 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01945303
[ 60] 0x00007fee3ded2760 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02385760
[ 61] 0x00007fee3e620a4b /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_dispatcher.so+00596555 _ZN8Mfh_file11dispatch_fhEiPP11mxArray_tagiS2_+000539
[ 62] 0x00007fee3de9388f /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02128015
[ 63] 0x00007fee3de92c69 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+02124905
[ 64] 0x00007fee3ddf129c /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01462940 inCallFcnWithTrap+000092
[ 65] 0x00007fee3de57bfb /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01883131
[ 66] 0x00007fee3ddf0168 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwm_interpreter.so+01458536 _Z28inCallFcnWithTrapInDesiredWSiPP11mxArray_tagiS1_PKcbP15inWorkSpace_tag+000104
[ 67] 0x00007fee36365b09 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwiqm.so+02878217 _ZN3iqm15BaseFEvalPlugin7executeEP15inWorkSpace_tagRN5boost10shared_ptrIN14cmddistributor17IIPCompletedEventEEE+000457
[ 68] 0x00007fedff8a992d /usr/local/MATLAB/R2012b/bin/glnxa64/libnativejmi.so+00674093 _ZN9nativejmi14JmiFEvalPlugin7executeEP15inWorkSpace_tagRN5boost10shared_ptrIN14cmddistributor17IIPCompletedEventEEE+000173
[ 69] 0x00007fedff8d6c45 /usr/local/MATLAB/R2012b/bin/glnxa64/libnativejmi.so+00859205 _ZN3mcr3mvm27McrSwappingIqmPluginAdapterIN9nativejmi14JmiFEvalPluginEE7executeEP15inWorkSpace_tagRN5boost10shared_ptrIN14cmddistributor17IIPCompletedEventEEE+000629
[ 70] 0x00007fee3633bbfa /usr/local/MATLAB/R2012b/bin/glnxa64/libmwiqm.so+02706426
[ 71] 0x00007fee3632d594 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwiqm.so+02647444
[ 72] 0x00007fee357d7ccd /usr/local/MATLAB/R2012b/bin/glnxa64/libmwbridge.so+00122061 _Z10ioReadLinebP8_IO_FILERKN5boost8optionalIKP15inWorkSpace_tagEEb+000429
[ 73] 0x00007fee357d8354 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwbridge.so+00123732
[ 74] 0x00007fee357dd71d /usr/local/MATLAB/R2012b/bin/glnxa64/libmwbridge.so+00145181
[ 75] 0x00007fee357dd81e /usr/local/MATLAB/R2012b/bin/glnxa64/libmwbridge.so+00145438
[ 76] 0x00007fee357ddf07 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwbridge.so+00147207 _Z8mnParserv+000631
[ 77] 0x00007fee3e8b7472 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00447602 _ZN11mcrInstance30mnParser_on_interpreter_threadEv+000034
[ 78] 0x00007fee3e895b69 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00310121
[ 79] 0x00007fee3e895d48 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00310600
[ 80] 0x00007fee3eeabf73 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+00999283 _ZN10eventqueue18UserEventQueueImpl5flushEv+000371
[ 81] 0x00007fee3eeac695 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01001109 _ZN10eventqueue8ReadPipeEib+000053
[ 82] 0x00007fee3eeab321 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+00996129 _ZN10eventqueue18UserEventQueueImpl9selectFcnEb+000353
[ 83] 0x00007fee3284fa65 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwuix.so+00518757
[ 84] 0x00007fee3ef45a11 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01628689 _ZSt8for_eachIN9__gnu_cxx17__normal_iteratorIPN5boost8weak_ptrIN4sysq10ws_ppeHookEEESt6vectorIS6_SaIS6_EEEENS4_8during_FIS6_NS2_10shared_ptrIS5_EEEEET0_T_SH_SG_+000081
[ 85] 0x00007fee3ef46aeb /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01633003 _ZN4sysq12ppe_for_eachINS_8during_FIN5boost8weak_ptrINS_10ws_ppeHookEEENS2_10shared_ptrIS4_EEEEEET_RKS9_+000251
[ 86] 0x00007fee3ef445a2 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01623458 _ZN4sysq19ppePollingDuringFcnEb+000114
[ 87] 0x00007fee3ef44969 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01624425 _ZN4sysq11ppeMainLoopEiib+000121
[ 88] 0x00007fee3ef44b08 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01624840 _ZN4sysq11ppeLoopIfOKEiib+000152
[ 89] 0x00007fee3ef44c63 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwservices.so+01625187 _ZN4sysq20processPendingEventsEiib+000147
[ 90] 0x00007fee3e896664 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00312932
[ 91] 0x00007fee3e896b3c /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00314172
[ 92] 0x00007fee3e890592 /usr/local/MATLAB/R2012b/bin/glnxa64/libmwmcr.so+00288146
[ 93] 0x00007fee3cdc0e9a /lib/x86_64-linux-gnu/libpthread.so.0+00032410
[ 94] 0x00007fee3caedcbd /lib/x86_64-linux-gnu/libc.so.6+00998589 clone+000109
This error was detected while a MEX-file was running. If the MEX-file
is not an official MathWorks function, please examine its source code
for errors. Please consult the External Interfaces Guide for information
on debugging MEX-files.
If this problem is reproducible, please submit a Service Request via:
http://www.mathworks.com/support/contact_us/
A technical support engineer might contact you with further information.
Thank you for your help.** This crash report has been saved to disk as /home/gwala/matlab_crash_dump.11705-1 **
class_handle: trying to cast
Destroy object 0x7f0e1e45f090
class_handle: trying to cast
Deleted myclass with handle: 139698584223104
Error using parallel_function (line 589)
The session that parfor is using has shut down.
可以看出，接口是正确创建的，然后 aFunction 正确返回值 3 为 'out' （这甚至适用于多次调用）。然后 parfor 循环开始，众所周知 matlab 对象已保存（实际上我不清楚为什么它会保存两次，但即使在命令行窗口中，当我保存 myInterface 对象时也会发生这种情况）。最后创建一个新的 myInterface，句柄为 0，句柄恢复为正确的先前值。Altought，对 aFunctions 的调用失败。
我最后报告了 myInterface matlab 类：
classdef myInterface < handle
properties (SetAccess = private, Transient=true)
objectHandle; % Handle to the underlying C++ class instance
end
methods(Static=true)
function obj = loadobj(this)
obj = myInterface();
obj.objectHandle = this.objectHandle;
disp(['Load interface with CPP handle: ' num2str(this.objectHandle)]);
end
end
methods
function obj = saveobj(this)
obj.objectHandle = this.objectHandle;
disp(['Save interface with CPP handle: ' num2str(this.objectHandle)]);
end
%% Constructor - Create a new C++ class instance
function this = myInterface(varargin)
if (size(varargin) == 0) % constructor with no arguments. Used in load/save operations
this.objectHandle = 0;
else % constructor with normal arguments
this.objectHandle = myMexInterface('new', varargin{:});
end
disp(['Create interface with CPP handle: ' num2str(this.objectHandle)]);
end
%% Destructor - Destroy the C++ class instance
function delete(this)
myMexInterface('delete', this.objectHandle);
disp(['Deleted myclass with handle: ' num2str(this.objectHandle)]);
end
%% aFunction
function varargout = aFunction(this, varargin)
[varargout{1:nargout}] = myMexInterface('aFunction', this.objectHandle,varargin{:});
end
end
end
请注意，正如 [2] 中所建议的，我包含了 loadobj、saveobj 函数，并且该类具有“Transient”属性以实现加载/保存操作。
希望在某人的帮助下，我希望这篇文章可以帮助某人。
问候， 加布里埃尔·瓜兰迪