5

我正在尝试将私有框架与 PyObjC 一起使用。到目前为止我有这个：

from AppKit import *
from Foundation import *
import objc

framework="/System/Library/PrivateFrameworks/DSObjCWrappers.framework"
objc.loadBundle("DSObjCWrapper", globals(), framework)

directory = DSoDirectory.alloc()
directory.initWithHost_user_password_("server", "diradmin", "password")

eDSStartsWith = 0x2002
node = directory.findNode_matchType_(u"/LDAPv3", eDSStartsWith)

这很好用。现在，我想用这个objective-c 签名在我的节点（DSoNode 类）上调用一个方法。

  • (BOOL) hasRecordsOfType:(const char*) inType

最明显的方法不知道如何获取字符串并将其传递给 char*：

node.hasRecordsOfType_("dsRecTypeStandard:ComputerLists")
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)

/Users/clinton/<ipython console> in <module>()

ValueError: depythonifying 'char', got 'str' of 31

看起来可以更改 python 看到的签名。我尝试了一些变化：

objc.registerMetaDataForSelector("DSoNode", "hasRecordsOfType_", dict( arguments={ 2+0: dict(type_modifier='n', type='^C') }))

但是——坦率地说，我不知道 registerMetaDataForSelector 函数是如何工作的，也没有找到关于它的文档——当我在节点上调用我的选择器时，我仍然遇到同样的错误。如何告诉 PyObjC 将字符串转换为 char*？（或者有没有更好的方法，因为这些字符串是 C 常量 #defined 在头文件中。）

Update: I tried using gen_bridge_metadata (as mentioned in this blog post), and, after consulting the man page, tried it as follows:

sudo mkdir -p /System/Library/PrivateFrameworks/DSObjCWrappers.framework/Resources/BridgeSupport
sudo gen_bridge_metadata --framework ~/Downloads/DSTools-112.1/build/Deployment/DSObjCWrappers.framework/ --output /System/Library/PrivateFrameworks/DSObjCWrappers.framework/Resources/BridgeSupport/DSObjCWrappers.bridgesupport

I still get the same error; there is no indication that this was even noticed, except that if I type:

help(modules)

I get:

/System/Library/PrivateFrameworks/DSObjCWrappers.framework/Versions/A/Resources/<ipython console> in <module>()

NameError: name 'modules' is not defined

I should also mention that I found a list of types that I believe would be understood by the registerMetaDataForSelector function; objective-C type encodings. Note that the XML for the particular function I'm after says:

<method selector='hasRecordsOfType:'>
<retval type='B'/>
</method>

I would've expected something explaining the input parameter, too.

4

2 回答 2

2

I believe you want the following and then should pass a non-unicode string:

objc.registerMetaDataForSelector("DSoNode",
                                 "hasRecordsOfType:",
            dict(
                arguments =
                {
                    2: dict(type=objc._C_PTR + objc._C_CHAR_AS_TEXT,
                            c_array_delimited_by_null=True,
                            type_modifier=objc._C_IN)
                }
            ))

A more complete NSString example follows:

from AppKit import *
from Foundation import *
import objc

def setupMetadata():
    objc.registerMetaDataForSelector("NSString", "stringWithCString:",
        dict(
            arguments =
            {
                2: dict(type=objc._C_PTR + objc._C_CHAR_AS_TEXT,
                        c_array_delimited_by_null=True,
                        type_modifier=objc._C_IN)
            }
        ))

def doTest():
    s = NSMutableString.stringWithString_(u"foo");
    NSLog(u"string[" + s + "]")

    s2 = NSString.stringWithCString_("bar")
    NSLog(u"string[" + s2 + "]")

setupMetadata()
doTest()
于 2009-10-01T23:13:01.023 回答
0

You have to call hasRecordsOfType like so:

from ctypes import *

typeString = c_char_p('dsRecTypeStandard:ComputerLists')
node.hasRecordsOfType_(typeString)
于 2009-11-13T20:02:21.433 回答