cocos2dx-2.x CCFileUtils文件管理类分析(2)

  次阅读 作者:智能小宝 来源:互联网 2015-09-28 10:58 我要评论(0)

在1中,我只是针对整体结构进行了分析,那么在2中,我将会对一些我们常用的函数进行分析。

//获取给定文件名的全路径

//下面这很长一段注释,通过举例子,像我们说明cocos2dx获取文件全路径的规则。

//这段我就不翻译了,直接通过代码来看。

/** Returns the fullpath for a given filename.

First it will try to get a new filename from the "filenameLookup" dictionary.

If a new filename can't be found on the dictionary, it will use the original filename.

Then it will try to obtain the full path of the filename using the CCFileUtils search rules: resolutions, and search paths.

The file search is based on the array element order of search paths and resolution directories.

For instance:

We set two elements("/mnt/sdcard/", "internal_dir/") to search paths vector by setSearchPaths,

and set three elements("resources-ipadhd/", "resources-ipad/", "resources-iphonehd")

to resolutions vector by setSearchResolutionsOrder. The "internal_dir" is relative to "Resources/".

If we have a file named 'sprite.png', the mapping in fileLookup dictionary contains `key: sprite.png -> value: sprite.pvr.gz`.

Firstly, it will replace 'sprite.png' with 'sprite.pvr.gz', then searching the file sprite.pvr.gz as follows:

/mnt/sdcard/resources-ipadhd/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/resources-ipad/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/resources-iphonehd/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/sprite.pvr.gz(if not found, search next)

internal_dir/resources-ipadhd/sprite.pvr.gz(if not found, search next)

internal_dir/resources-ipad/sprite.pvr.gz(if not found, search next)

internal_dir/resources-iphonehd/sprite.pvr.gz(if not found, search next)

internal_dir/sprite.pvr.gz(if not found, return "sprite.png")

If the filename contains relative path like "gamescene/uilayer/sprite.png",

and the mapping in fileLookup dictionary contains `key: gamescene/uilayer/sprite.png -> value: gamescene/uilayer/sprite.pvr.gz`.

The file search order will be:

/mnt/sdcard/gamescene/uilayer/resources-ipadhd/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/gamescene/uilayer/resources-ipad/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/gamescene/uilayer/resources-iphonehd/sprite.pvr.gz(if not found, search next)

/mnt/sdcard/gamescene/uilayer/sprite.pvr.gz(if not found, search next)

internal_dir/gamescene/uilayer/resources-ipadhd/sprite.pvr.gz(if not found, search next)

internal_dir/gamescene/uilayer/resources-ipad/sprite.pvr.gz(if not found, search next)

internal_dir/gamescene/uilayer/resources-iphonehd/sprite.pvr.gz(if not found, search next)

internal_dir/gamescene/uilayer/sprite.pvr.gz(if not found, return "gamescene/uilayer/sprite.png")

If the new file can't be found on the file system, it will return the parameter pszFileName directly.

@since v2.1

*/

virtual std::string fullPathForFilename(const char* pszFileName);

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