如何在 CFDictionary 上进行查找

发布于 2024-11-07 07:06:37 字数 709 浏览 0 评论 0原文

可能的重复：
如何从以下位置检索特定键的值CFMutableDictionary

在 C++ 中：

typedef struct
{
     unsigned short wId;
     bool bPersists;
     unsigned short uPeriod;
     bool bStop;
}stTimer;

unsigned short wId;
stTimer pEvent;
CTypedPtrMap<CMapWordToPtr,WORD,stTimer*>m_cIdMap;
if(m_cIdMap.Lookup(wId,pEvent))
{
    //find and remove the event pEvent;
}

我需要将相同的功能移植到 Objective-C

我可以将值设置并获取到 CFDictionary 中，但我需要看看使用 wId（键）和 pEvent（值）将 ups 放入字典中。

原文

Possible Duplicate:
How to retrieve the values for the particular key from CFMutableDictionary

In C++:

typedef struct
{
     unsigned short wId;
     bool bPersists;
     unsigned short uPeriod;
     bool bStop;
}stTimer;

unsigned short wId;
stTimer pEvent;
CTypedPtrMap<CMapWordToPtr,WORD,stTimer*>m_cIdMap;
if(m_cIdMap.Lookup(wId,pEvent))
{
    //find and remove the event pEvent;
}

I need to port the same functionality to Objective-C

I could be able to set and get the values into the CFDictionary, but I need to do look ups into the dictionary with the wId(key) and the pEvent(value).

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请恋爱 2024-11-14 07:06:37

您将使用 NSDictionary 并用 NSNumber 将键装箱（假设您已经创建了一个类来表示您的 stTimer 结构）。

[myDictionary setObject: myStTimer forKey: [NSNumber numberWithUnsignedInt: [myStTimer wId]]];

StTimer* mySTTimer = [myDictionary objectForKey: [NSNumber numberWithUnsignedInt: anId]];

我认为没有任何必要使用较低级别的接口。您最好坚持使用 C++ 版本。

You would use an NSDictionary and box the keys with NSNumber (assuming you have created a class to represent your stTimer struct.

[myDictionary setObject: myStTimer forKey: [NSNumber numberWithUnsignedInt: [myStTimer wId]]];

StTimer* mySTTimer = [myDictionary objectForKey: [NSNumber numberWithUnsignedInt: anId]];

I don't see any point of going for a lower level interface. You might as well stick with the C++ version.

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