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调用一个从PyObjC获取char*的选择器

pyobjc char pointers objective-c

Clinton Blackmore · 技术社区 · 17 年前

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。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)在Type中有RecordsOfType:(const char*)

最明显的方法是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

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

gen_bridge_metadata in this blog post

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

help(modules)

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

NameError: name 'modules' is not defined

我还应该提到,我找到了一个我认为registerMetaDataForSelector函数可以理解的类型列表; objective-C type encodings

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

我本来也希望能解释一下输入参数。

2 回复 | 直到 17 年前

nall 17 年前

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)
                }
            ))

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()

Lyndsey Ferguson 16 年前

from ctypes import *

typeString = c_char_p('dsRecTypeStandard:ComputerLists')
node.hasRecordsOfType_(typeString)