我需要使用动态库，用 Python 代码写在 Qt/C++ 上。
我发现了这个工具http://pyqt.sourceforge.net/Docs/sip4/using.html#ref-simple-c-example 我在使用它时遇到了问题。
所以，我有这个 C++ 库的文件
你好.h
// Define the interface to the hello library.
#include <qlabel.h>
#include <qwidget.h>
#include <qstring.h>
class Hello : public QLabel {
// This is needed by the Qt Meta-Object Compiler.
Q_OBJECT
public:
Hello(QWidget *parent);
private:
// Prevent instances from being copied.
Hello(const Hello &);
Hello &operator=(const Hello &);
};
你好.cpp
#include "hello.h"
#include "stdio.h"
Hello::Hello(QWidget *parent = 0):QLabel(parent)
{
printf("First Qt example function");
}
Hello::Hello(const Hello &)
{
}
Hello &Hello::operator=(const Hello &)
{
return *this;
}
proj.pro
QT += core gui
TARGET = hello
TEMPLATE = lib
SOURCES += hello.cpp
HEADERS += hello.h
我用qmake-qt4编译 然后使用make，得到了 theesw 文件
-rwxr-xr-x 1 alex alex 630459 Dec 15 00:03 hello.so
lrwxrwxrwx 1 alex alex 17 Dec 15 00:01 libhello.so -> libhello.so.1.0.0
lrwxrwxrwx 1 alex alex 17 Dec 15 00:01 libhello.so.1 -> libhello.so.1.0.0
lrwxrwxrwx 1 alex alex 17 Dec 15 00:01 libhello.so.1.0 -> libhello.so.1.0.0
-rwxr-xr-x 1 alex alex 21295 Dec 15 00:01 libhello.so.1.0.0
然后，Ia 有 SIP 配置文件
配置文件
import os
import sipconfig
from PyQt4 import pyqtconfig
# The name of the SIP build file generated by SIP and used by the build
# system.
build_file = "hello.sbf"
# Get the PyQt configuration information.
config = pyqtconfig.Configuration()
# Get the extra SIP flags needed by the imported PyQt modules. Note that
# this normally only includes those flags (-x and -t) that relate to SIP's
# versioning system.
pyqt_sip_flags = config.pyqt_sip_flags
# Run SIP to generate the code. Note that we tell SIP where to find the qt
# module's specification files using the -I flag.
os.system(" ".join([config.sip_bin, "-c", ".", "-b", build_file, "-I", config.pyqt_sip_dir, pyqt_sip_flags, "hello.sip"]))
# We are going to install the SIP specification file for this module and
# its configuration module.
installs = []
installs.append(["hello.sip", os.path.join(config.default_sip_dir, "hello")])
installs.append(["helloconfig.py", config.default_mod_dir])
# Create the Makefile. The QtGuiModuleMakefile class provided by the
# pyqtconfig module takes care of all the extra preprocessor, compiler and
# linker flags needed by the Qt library.
makefile = pyqtconfig.QtGuiModuleMakefile(
configuration=config,
build_file=build_file,
installs=installs
)
# Add the library we are wrapping. The name doesn't include any platform
# specific prefixes or extensions (e.g. the "lib" prefix on UNIX, or the
# ".dll" extension on Windows).
makefile.extra_libs = ["hello"]
# Generate the Makefile itself.
makefile.generate()
# Now we create the configuration module. This is done by merging a Python
# dictionary (whose values are normally determined dynamically) with a
# (static) template.
content = {
# Publish where the SIP specifications for this module will be
# installed.
"hello_sip_dir": config.default_sip_dir,
# Publish the set of SIP flags needed by this module. As these are the
# same flags needed by the qt module we could leave it out, but this
# allows us to change the flags at a later date without breaking
# scripts that import the configuration module.
"hello_sip_flags": pyqt_sip_flags
}
# This creates the helloconfig.py module from the helloconfig.py.in
# template and the dictionary.
sipconfig.create_config_module("helloconfig.py", "helloconfig.py.in", content)
你好.sip
// Define the SIP wrapper to the hello library.
%Module hello
%Import QtGui/QtGuimod.sip
%If (Qt_4_2_0 -)
class Hello : public QLabel {
%TypeHeaderCode
#include <hello.h>
%End
public:
Hello(QWidget *parent /TransferThis/ = 0);
private:
Hello(const Hello &);
};
%End
helloconfig.py.in
from PyQt4 import pyqtconfig
# These are installation specific values created when Hello was configured.
# The following line will be replaced when this template is used to create
# the final configuration module.
# @SIP_CONFIGURATION@
class Configuration(pyqtconfig.Configuration):
"""The class that represents Hello configuration values.
"""
def __init__(self, sub_cfg=None):
"""Initialise an instance of the class.
sub_cfg is the list of sub-class configurations. It should be None
when called normally.
"""
# This is all standard code to be copied verbatim except for the
# name of the module containing the super-class.
if sub_cfg:
cfg = sub_cfg
else:
cfg = []
cfg.append(_pkg_config)
pyqtconfig.Configuration.__init__(self, cfg)
class HelloModuleMakefile(pyqtconfig.QtGuiModuleMakefile):
"""The Makefile class for modules that %Import hello.
"""
def finalise(self):
"""Finalise the macros.
"""
# Make sure our C++ library is linked.
self.extra_libs.append("hello")
# Let the super-class do what it needs to.
pyqtconfig.QtGuiModuleMakefile.finalise(self)
然后我用
$ python ./configure.py
然后我用 make 弄错了
/usr/bin/ld: cannot find -lhello
collect2: error: ld returned 1 exit status
make: *** [hello.so] Error 1
但这是一个简单的问题，通过添加 -L 即可解决。
我的目录中有新的.so - hello.so
然后，我使用简单的 python 脚本来测试结果。
import hello
h = hello.Hello()
print h
我有一个错误
Ever/ QtExample $ python ./pythontest.py Traceback (most recent call last): File "./pythontest.py", line 1, in <module>
import hello ImportError: libhello.so.1: cannot open shared object file: No such file or directory
我的错误在哪里？我做错了什么？