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MacRuby指针和Obj-C函数通过引用返回值(MacRuby pointers and Obj-C function returning a value by reference)

 我试图在Macruby中实现以下NSAttributedString方法：  
 
  （id）属性：（NSString *）attributeName atIndex：（NSUInteger）index effectiveRange：（NSRangePointer）aRange  
 
 根据定义，它Returns the value for an attribute with a given name of the character at a given index, and by reference the range over which the attribute applies.  
 好的，所以我需要一个指向NSRange的指针，我设置如下：  
range=Pointer.new("{_NSRange=QQ}")[0]
 
 它看起来很好，因为range.class => NSRange 。  
 但是，当我执行方法时：  
font=txtStor.attribute(NSFontAttributeName,atIndex:index,effectiveRange:range)
 
 我的range总是#<NSRange location=0 length=0> 。 另外， p range给出了#<NSRange location=0 length=0> 。  
 任何想法如何正确实现这一点？ 

I am trying to implement the following method of NSAttributedString in Macruby: 
 
 (id)attribute:(NSString *)attributeName atIndex:(NSUInteger)index effectiveRange:(NSRangePointer)aRange 
 
As by definition, it Returns the value for an attribute with a given name of the character at a given index, and by reference the range over which the attribute applies. 
OK, so I need a pointer to NSRange, which I set up as follows: 
range=Pointer.new("{_NSRange=QQ}")[0]
 
It seems to be fine as range.class => NSRange. 
However, when I execute the method:  
font=txtStor.attribute(NSFontAttributeName,atIndex:index,effectiveRange:range)
 
my range is always #<NSRange location=0 length=0>. Also, p range gives me #<NSRange location=0 length=0>. 
Any ideas how to implement this correctly?

原文：https://stackoverflow.com/questions/14431430

更新时间：2022-03-11 14:03

最满意答案

 更新清单使用此  
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="lk.adspace.jaffnatemples"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <permission
        android:name="lk.adspace.jaffnatemples.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="com.ram.googlemapsv2.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="lk.adspace.jaffnatemples.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.gms.version"
            android:value="v3" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="your api key" />
    </application>

</manifest>

updated manifest use this  
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="lk.adspace.jaffnatemples"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <permission
        android:name="lk.adspace.jaffnatemples.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="com.ram.googlemapsv2.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="lk.adspace.jaffnatemples.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.gms.version"
            android:value="v3" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="your api key" />
    </application>

</manifest>

MacRuby指针和Obj-C函数通过引用返回值(MacRuby pointers and Obj-C function returning a value by reference)

最满意答案

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