Load a .so object with QLibrary from PyQt
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@ilian In any case you should print out the output of errorString() to get more information next time it fails.
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@jsulm Are you aware of
PyQt, it resolved myinitfunction with somesip.voidptrthing, that I don't know how to call. Originally I'd get aCfunction pointer but thissip.voidptris not callable.Lifetime Qt Championwrote on 7 Jun 2017, 11:15 last edited by jsulm 6 Jul 2017, 11:18@ilian What init function do you mean? Is it a function from your library? If so then sip.voidptr probably means that it could not resolve the function.
See http://doc.qt.io/qt-5.9/qlibrary.html#resolve, you need to export your functions to be able to resolve them. -
@ilian What init function do you mean? Is it a function from your library? If so then sip.voidptr probably means that it could not resolve the function.
See http://doc.qt.io/qt-5.9/qlibrary.html#resolve, you need to export your functions to be able to resolve them.wrote on 7 Jun 2017, 12:19 last edited by@jsulm I have an init function
extern "C" int init(int argc, char **argv) { QApplication a(argc, argv); MyWidget w; w.init(); return a.exec(); }resolve()returns a non null value, which issip.voidptr, and I am expecting this to be aCfunction pointer but, I have no idea how to call it. -
@jsulm I have an init function
extern "C" int init(int argc, char **argv) { QApplication a(argc, argv); MyWidget w; w.init(); return a.exec(); }resolve()returns a non null value, which issip.voidptr, and I am expecting this to be aCfunction pointer but, I have no idea how to call it.Lifetime Qt Championwrote on 7 Jun 2017, 12:23 last edited by jsulm 6 Jul 2017, 12:27@ilian Please take a look at the link I posted before: you need to export your function, else it cannot be resolved.
You are aware that a.exec() will block until you close your app? That means init() call will block.
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@ilian Please take a look at the link I posted before: you need to export your function, else it cannot be resolved.
You are aware that a.exec() will block until you close your app? That means init() call will block.
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@jsulm I am aware yes, removed it, and just show the widget. However, I did the example with MY_EXPORT macro, I still get this voidptr. I will test in C++ program to see if there everything is OK.
@ilian This void pointer is valid, but I don't know how to use it if it points to a function. Never did this with PyQt.
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@ilian This void pointer is valid, but I don't know how to use it if it points to a function. Never did this with PyQt.
wrote on 7 Jun 2017, 12:53 last edited by@jsulm I've made a similar C++ program with the function pointer, and it does what I want, open a widget and enters it's event loop. In short, as C++ program, loading the library everything is fine, as PyQt - it's not, or the reslove form PyQt and that sip.voidptr are some weird stuff, we know not of.
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wrote on 7 Jun 2017, 14:21 last edited by
libc = CDLL('/home/ilian/git-projects/build-testpyqtlib-Desktop_Qt_5_7_1_GCC_64bit-Debug/libtestpyqtlib.so')That line of code solved it all, just calledlibc.init(0, 0)and the widget from the lib appeared... -
@jsulm I've made a similar C++ program with the function pointer, and it does what I want, open a widget and enters it's event loop. In short, as C++ program, loading the library everything is fine, as PyQt - it's not, or the reslove form PyQt and that sip.voidptr are some weird stuff, we know not of.
@ilian said in Load a .so object with QLibrary from PyQt:
sip.voidptr
this is not weird stuff :-)
It is documented, I just don't know how to use it if it contains a function pointer - I could not find anything in SIP documentation for this use case. -
@ilian said in Load a .so object with QLibrary from PyQt:
sip.voidptr
this is not weird stuff :-)
It is documented, I just don't know how to use it if it contains a function pointer - I could not find anything in SIP documentation for this use case.
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