"Internal problem" when running a MEX file the second time

Liu
2012 6 17
1 个回答
7 次查看（30 天）

0 个投票

Hi, I am having a problem when trying to run a .mexmaci64 file written by C++ with OpenCV the second time. I really appreciate if someone could help me.
Here is the test I did: I created a .dylib by C++ and some OpenCV stuff, and compiled it in the terminal with something like this:
g++ -dynamiclib Test.cpp -fvisibility=hidden -o libTest.dylib `pkg-config --cflags --libs opencv`
Then, in the mexFunction, I loaded this .dylib and did nothing else. It could run properly the first time, but Matlab popped up a window saying "Matlab encountered a internal problem... bla bla" when I ran it the second time.
I think it's because the dylib with OpenCV couldn't be loaded properly the second time, since I tried the same thing without the OpenCV stuff and everything is fine.
Does anyone know how to solve this? Thank you!

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回答（1 个）

Ken Atwell
Ken Atwell 2012-6-18

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Does the OpenCV library have a "close" function or something similar to call before the library is unloaded? Assuming there is, you could call this as the last operation in Test.cpp.

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Liu
Liu 2012-6-18
Hi Ken,
Thanks for your answer. I used the dlopen() and dlclose() in a function TestArray() to load and close the dylib, and mexFunction will call TestArray(). It's something like this:
void TestArray() {
//....
void *hLib = dlopen(libName, RTLD_LOCAL);
if (!hLib) {
printf("Unable to open library:\n%s\n", libName);
printf("%s\n", dlerror());
return;
}
//......
if (dlclose(hLib)) {
printf("Unable to close library:\n%s\n", dlerror());
}
}
I tried to print something out to check at which step it crashes, and it turned out to be the dlopen() part when called the second time. I tried to put it in a try-catch, but MATLAB still reports the same thing. Maybe I should reorganise my code and separate the OpenCV part; it seems really confusing...

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2012-6-17

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