是否可以从 ObjC 调用 Python 模块? [英] Is it possible to call a Python module from ObjC?

问题描述

使用 PyObjC，是否可以导入 Python 模块、调用函数并以(例如)NSString 形式获取结果?

Using PyObjC, is it possible to import a Python module, call a function and get the result as (say) a NSString?

例如，执行以下 Python 代码的等效操作:

For example, doing the equivalent of the following Python code:

import mymodule
result = mymodule.mymethod()

..在伪ObjC中:

PyModule *mypymod = [PyImport module:@"mymodule"];
NSString *result = [[mypymod getattr:"mymethod"] call:@"mymethod"];

推荐答案

如 Alex Martelli 的回答中所述(尽管邮件列表消息中的链接已损坏，但它应该是 https://docs.python.org/extending/embedding.html#pure-embedding).. C 方式打电话..

As mentioned in Alex Martelli's answer (although the link in the mailing-list message was broken, it should be https://docs.python.org/extending/embedding.html#pure-embedding).. The C way of calling..

print urllib.urlopen("http://google.com").read()

• 将 Python.framework 添加到您的项目中(右键单击 External Frameworks..，Add > Existing Frameworks./System/Library 中的框架/Frameworks/
• 将 /System/Library/Frameworks/Python.framework/Headers 添加到您的标题搜索路径"(Project > Edit Project Settings)
• Add the Python.framework to your project (Right click External Frameworks.., Add > Existing Frameworks. The framework in in /System/Library/Frameworks/
• Add /System/Library/Frameworks/Python.framework/Headers to your "Header Search Path" (Project > Edit Project Settings)

下面的代码应该可以工作(虽然它可能不是有史以来最好的代码......)

The following code should work (although it's probably not the best code ever written..)

#include <Python.h>

int main(){
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    Py_Initialize();

    // import urllib
    PyObject *mymodule = PyImport_Import(PyString_FromString("urllib"));
    // thefunc = urllib.urlopen
    PyObject *thefunc = PyObject_GetAttrString(mymodule, "urlopen");

    // if callable(thefunc):
    if(thefunc && PyCallable_Check(thefunc)){
        // theargs = ()
        PyObject *theargs = PyTuple_New(1);

        // theargs[0] = "http://google.com"
        PyTuple_SetItem(theargs, 0, PyString_FromString("http://google.com"));

        // f = thefunc.__call__(*theargs)
        PyObject *f = PyObject_CallObject(thefunc, theargs);

        // read = f.read
        PyObject *read = PyObject_GetAttrString(f, "read");

        // result = read.__call__()
        PyObject *result = PyObject_CallObject(read, NULL);


        if(result != NULL){
            // print result
            printf("Result of call: %s", PyString_AsString(result));
        }
    }
    [pool release];
}

还有本教程很好

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