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Hello, I've been using
QLibrary
many times, however now I have a case when I want to load
.so
from
PyQt
. Following their docs it should be done the same way, but since it's
python
I don't follow why
load()
returns with
False
. Here is the simple
.so
code:
interface.h
:
#ifndef INTERFACE_H
#define INTERFACE_H
#ifdef __cplusplus
extern "C" {
#endif
int init(int argc, char** argv);
#ifdef __cplusplus
#endif
I have and a .cpp file :
interface.cpp
#include "interface.h"
#include "testwidget.h"
#include <QApplication>
int init(int argc, char **argv)
QApplication a(argc, argv);
MyWidget w;
w.init();
return a.exec();
Assume that testwidget is just a 200 x 200 empty window. So here is what is happening in python:
import os as UNIX
import sys
from PyQt5 import QtCore
def main(*args, **kwargs):
testlib = QtCore.QLibrary('/home/ilian/Qt/build-testpyqtlib-Desktop_Qt_5_8_0_GCC_64bit-Debug/libtestpyqtlib.so')
res = testlib.load()
if res:
print("OK, loaded library!")
else:
print("Failed to load library!")
if __name__ == "__main__":
main(sys.argv)
Don't fire at me why I am doing it with 'PyQt, it's something inherited and I have to work with it. Just tell me why this call fails here? Everything is in place as directories. It just does not loads the .so` file.
Regards.
#endif // INTERFACE_H
@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 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.
@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.
