FileUtils类作用及CCFileUtils.h
FileUtils类是本地文件读写的一个工具接口类,定义了查找、读取、写入、删除等接口.全局只有一个实例。
CCFileUtils.h
#ifndef __CC_FILEUTILS_H__
#define __CC_FILEUTILS_H__
#include <string>
#include <vector>
#include <unordered_map>
#include "platform/CCPlatformMacros.h"
#include "base/ccTypes.h"
#include "base/CCValue.h"
#include "base/CCData.h"
NS_CC_BEGIN
/**
* @addtogroup platform
* @{
*/
/** Helper class to handle file operations. */
class CC_DLL FileUtils
{
public:
/**
* Gets the instance of FileUtils.
*/
static FileUtils* getInstance();
/**
* Destroys the instance of FileUtils.
*/
static void destroyInstance();
/**
* You can inherit from platform dependent implementation of FileUtils, such as FileUtilsAndroid,
* and use this function to set delegate, then FileUtils will invoke delegate's implementation.
* For example, your resources are encrypted, so you need to decrypt it after reading data from
* resources, then you can implement all getXXX functions, and engine will invoke your own getXX
* functions when reading data of resources.
*
* If you don't want to system default implementation after setting delegate, you can just pass nullptr
* to this function.
*
* @warning It will delete previous delegate
* @lua NA
*/
static void setDelegate(FileUtils *delegate);
/** @deprecated Use getInstance() instead */
CC_DEPRECATED_ATTRIBUTE static FileUtils* sharedFileUtils() { return getInstance(); }
/** @deprecated Use destroyInstance() instead */
CC_DEPRECATED_ATTRIBUTE static void purgeFileUtils() { destroyInstance(); }
/**
* The destructor of FileUtils.
* @js NA
* @lua NA
*/
virtual ~FileUtils();
/**
* Purges full path caches.
*/
virtual void purgeCachedEntries();
/**
* Gets string from a file.
*/
virtual std::string getStringFromFile(const std::string& filename);
/**
* Creates binary data from a file.
* @return A data object.
*/
virtual Data getDataFromFile(const std::string& filename);
/**
* Gets resource file data
*
* @param[in] filename The resource file name which contains the path.
* @param[in] mode The read mode of the file.
* @param[out] size If the file read operation succeeds, it will be the data size, otherwise 0.
* @return Upon success, a pointer to the data is returned, otherwise NULL.
* @warning Recall: you are responsible for calling free() on any Non-NULL pointer returned.
*/
CC_DEPRECATED_ATTRIBUTE virtual unsigned char* getFileData(const std::string& filename, const char* mode, ssize_t *size);
/**
* Gets resource file data from a zip file.
*
* @param[in] filename The resource file name which contains the relative path of the zip file.
* @param[out] size If the file read operation succeeds, it will be the data size, otherwise 0.
* @return Upon success, a pointer to the data is returned, otherwise nullptr.
* @warning Recall: you are responsible for calling free() on any Non-nullptr pointer returned.
*/
virtual unsigned char* getFileDataFromZip(const std::string& zipFilePath, const std::string& filename, ssize_t *size);
/** 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 FileUtils 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 filename directly.
This method was added to simplify multiplatform support. Whether you are using cocos2d-js or any cross-compilation toolchain like StellaSDK or Apportable,
you might need to load different resources for a given file in the different platforms.
@since v2.1
*/
virtual std::string fullPathForFilename(const std::string &filename) const;
/**
* Loads the filenameLookup dictionary from the contents of a filename.
*
* @note The plist file name should follow the format below:
*
* @code
* <?xml version="1.0" encoding="UTF-8"?>
* <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
* <plist version="1.0">
* <dict>
* <key>filenames</key>
* <dict>
* <key>sounds/click.wav</key>
* <string>sounds/click.caf</string>
* <key>sounds/endgame.wav</key>
* <string>sounds/endgame.caf</string>
* <key>sounds/gem-0.wav</key>
* <string>sounds/gem-0.caf</string>
* </dict>
* <key>metadata</key>
* <dict>
* <key>version</key>
* <integer>1</integer>
* </dict>
* </dict>
* </plist>
* @endcode
* @param filename The plist file name.
*
@since v2.1
* @js loadFilenameLookup
* @lua loadFilenameLookup
*/
virtual void loadFilenameLookupDictionaryFromFile(const std::string &filename);
/**
* Sets the filenameLookup dictionary.
*
* @param pFilenameLookupDict The dictionary for replacing filename.
* @since v2.1
*/
virtual void setFilenameLookupDictionary(const ValueMap& filenameLookupDict);
/**
* Gets full path from a file name and the path of the relative file.
* @param filename The file name.
* @param pszRelativeFile The path of the relative file.
* @return The full path.
* e.g. filename: hello.png, pszRelativeFile: /User/path1/path2/hello.plist
* Return: /User/path1/path2/hello.pvr (If there a a key(hello.png)-value(hello.pvr) in FilenameLookup dictionary. )
*
*/
virtual std::string fullPathFromRelativeFile(const std::string &filename, const std::string &relativeFile);
/**
* Sets the array that contains the search order of the resources.
*
* @param searchResolutionsOrder The source array that contains the search order of the resources.
* @see getSearchResolutionsOrder(), fullPathForFilename(const char*).
* @since v2.1
* In js:var setSearchResolutionsOrder(var jsval)
* @lua NA
*/
virtual void setSearchResolutionsOrder(const std::vector<std::string>& searchResolutionsOrder);
/**
* Append search order of the resources.
*
* @see setSearchResolutionsOrder(), fullPathForFilename().
* @since v2.1
*/
virtual void addSearchResolutionsOrder(const std::string &order,const bool front=false);
/**
* Gets the array that contains the search order of the resources.
*
* @see setSearchResolutionsOrder(const std::vector<std::string>&), fullPathForFilename(const char*).
* @since v2.1
* @lua NA
*/
virtual const std::vector<std::string>& getSearchResolutionsOrder() const;
/**
* Sets the array of search paths.
*
* You can use this array to modify the search path of the resources.
* If you want to use "themes" or search resources in the "cache", you can do it easily by adding new entries in this array.
*
* @note This method could access relative path and absolute path.
* If the relative path was passed to the vector, FileUtils will add the default resource directory before the relative path.
* For instance:
* On Android, the default resource root path is "assets/".
* If "/mnt/sdcard/" and "resources-large" were set to the search paths vector,
* "resources-large" will be converted to "assets/resources-large" since it was a relative path.
*
* @param searchPaths The array contains search paths.
* @see fullPathForFilename(const char*)
* @since v2.1
* In js:var setSearchPaths(var jsval);
* @lua NA
*/
virtual void setSearchPaths(const std::vector<std::string>& searchPaths);
/**
* Set default resource root path.
*/
void setDefaultResourceRootPath(const std::string& path);
/**
* Add search path.
*
* @since v2.1
*/
void addSearchPath(const std::string & path, const bool front=false);
/**
* Gets the array of search paths.
*
* @return The array of search paths.
* @see fullPathForFilename(const char*).
* @lua NA
*/
virtual const std::vector<std::string>& getSearchPaths() const;
/**
* Gets the writable path.
* @return The path that can be write/read a file in
*/
virtual std::string getWritablePath() const = 0;
/**
* Sets writable path.
*/
virtual void setWritablePath(const std::string& writablePath);
/**
* Sets whether to pop-up a message box when failed to load an image.
*/
virtual void setPopupNotify(bool notify);
/** Checks whether to pop up a message box when failed to load an image.
* @return True if pop up a message box when failed to load an image, false if not.
*/
virtual bool isPopupNotify() const;
/**
* Converts the contents of a file to a ValueMap.
* @param filename The filename of the file to gets content.
* @return ValueMap of the file contents.
* @note This method is used internally.
*/
virtual ValueMap getValueMapFromFile(const std::string& filename);
/** Converts the contents of a file to a ValueMap.
* This method is used internally.
*/
virtual ValueMap getValueMapFromData(const char* filedata, int filesize);
/**
* write a ValueMap into a plist file
*
*@param dict the ValueMap want to save
*@param fullPath The full path to the file you want to save a string
*@return bool
*/
virtual bool writeToFile(ValueMap& dict, const std::string& fullPath);
/**
* write a string into a file
*
* @param dataStr the string want to save
* @param fullPath The full path to the file you want to save a string
* @return bool True if write success
*/
virtual bool writeStringToFile(std::string dataStr, const std::string& fullPath);
/**
* write Data into a file
*
*@param retData the data want to save
*@param fullPath The full path to the file you want to save a string
*@return bool
*/
virtual bool writeDataToFile(Data retData, const std::string& fullPath);
/**
* write ValueMap into a plist file
*
*@param dict the ValueMap want to save
*@param fullPath The full path to the file you want to save a string
*@return bool
*/
virtual bool writeValueMapToFile(ValueMap& dict, const std::string& fullPath);
/**
* write ValueVector into a plist file
*
*@param vecData the ValueVector want to save
*@param fullPath The full path to the file you want to save a string
*@return bool
*/
virtual bool writeValueVectorToFile(ValueVector vecData, const std::string& fullPath);
/**
* Windows fopen can't support UTF-8 filename
* Need convert all parameters fopen and other 3rd-party libs
*
* @param filename std::string name file for conversion from utf-8
* @return std::string ansi filename in current locale
*/
virtual std::string getSuitableFOpen(const std::string& filenameUtf8) const;
// Converts the contents of a file to a ValueVector.
// This method is used internally.
virtual ValueVector getValueVectorFromFile(const std::string& filename);
/**
* Checks whether a file exists.
*
* @note If a relative path was passed in, it will be inserted a default root path at the beginning.
* @param filename The path of the file, it could be a relative or absolute path.
* @return True if the file exists, false if not.
*/
virtual bool isFileExist(const std::string& filename) const;
/**
* Gets filename extension is a suffix (separated from the base filename by a dot) in lower case.
* Examples of filename extensions are .png, .jpeg, .exe, .dmg and .txt.
* @param filePath The path of the file, it could be a relative or absolute path.
* @return suffix for filename in lower case or empty if a dot not found.
*/
virtual std::string getFileExtension(const std::string& filePath) const;
/**
* Checks whether the path is an absolute path.
*
* @note On Android, if the parameter passed in is relative to "assets/", this method will treat it as an absolute path.
* Also on Blackberry, path starts with "app/native/Resources/" is treated as an absolute path.
*
* @param path The path that needs to be checked.
* @return True if it's an absolute path, false if not.
*/
virtual bool isAbsolutePath(const std::string& path) const;
/**
* Checks whether the path is a directory.
*
* @param dirPath The path of the directory, it could be a relative or an absolute path.
* @return True if the directory exists, false if not.
*/
virtual bool isDirectoryExist(const std::string& dirPath) const;
/**
* Creates a directory.
*
* @param dirPath The path of the directory, it must be an absolute path.
* @return True if the directory have been created successfully, false if not.
*/
virtual bool createDirectory(const std::string& dirPath);
/**
* Removes a directory.
*
* @param dirPath The full path of the directory, it must be an absolute path.
* @return True if the directory have been removed successfully, false if not.
*/
virtual bool removeDirectory(const std::string& dirPath);
/**
* Removes a file.
*
* @param filepath The full path of the file, it must be an absolute path.
* @return True if the file have been removed successfully, false if not.
*/
virtual bool removeFile(const std::string &filepath);
/**
* Renames a file under the given directory.
*
* @param path The parent directory path of the file, it must be an absolute path.
* @param oldname The current name of the file.
* @param name The new name of the file.
* @return True if the file have been renamed successfully, false if not.
*/
virtual bool renameFile(const std::string &path, const std::string &oldname, const std::string &name);
/**
* Renames a file under the given directory.
*
* @param oldfullpath The current fullpath of the file. Includes path and name.
* @param newfullpath The new fullpath of the file. Includes path and name.
* @return True if the file have been renamed successfully, false if not.
*/
virtual bool renameFile(const std::string &oldfullpath, const std::string &newfullpath);
/**
* Retrieve the file size.
*
* @note If a relative path was passed in, it will be inserted a default root path at the beginning.
* @param filepath The path of the file, it could be a relative or absolute path.
* @return The file size.
*/
virtual long getFileSize(const std::string &filepath);
/** Returns the full path cache. */
const std::unordered_map<std::string, std::string>& getFullPathCache() const { return _fullPathCache; }
protected:
/**
* The default constructor.
*/
FileUtils();
/**
* Initializes the instance of FileUtils. It will set _searchPathArray and _searchResolutionsOrderArray to default values.
*
* @note When you are porting Cocos2d-x to a new platform, you may need to take care of this method.
* You could assign a default value to _defaultResRootPath in the subclass of FileUtils(e.g. FileUtilsAndroid). Then invoke the FileUtils::init().
* @return true if succeed, otherwise it returns false.
*
*/
virtual bool init();
/**
* Gets the new filename from the filename lookup dictionary.
* It is possible to have a override names.
* @param filename The original filename.
* @return The new filename after searching in the filename lookup dictionary.
* If the original filename wasn't in the dictionary, it will return the original filename.
*/
virtual std::string getNewFilename(const std::string &filename) const;
/**
* Checks whether a file exists without considering search paths and resolution orders.
* @param filename The file (with absolute path) to look up for
* @return Returns true if the file found at the given absolute path, otherwise returns false
*/
virtual bool isFileExistInternal(const std::string& filename) const = 0;
/**
* Checks whether a directory exists without considering search paths and resolution orders.
* @param dirPath The directory (with absolute path) to look up for
* @return Returns true if the directory found at the given absolute path, otherwise returns false
*/
virtual bool isDirectoryExistInternal(const std::string& dirPath) const;
/**
* Gets full path for filename, resolution directory and search path.
*
* @param filename The file name.
* @param resolutionDirectory The resolution directory.
* @param searchPath The search path.
* @return The full path of the file. It will return an empty string if the full path of the file doesn't exist.
*/
virtual std::string getPathForFilename(const std::string& filename, const std::string& resolutionDirectory, const std::string& searchPath) const;
/**
* Gets full path for the directory and the filename.
*
* @note Only iOS and Mac need to override this method since they are using
* `[[NSBundle mainBundle] pathForResource: ofType: inDirectory:]` to make a full path.
* Other platforms will use the default implementation of this method.
* @param directory The directory contains the file we are looking for.
* @param filename The name of the file.
* @return The full path of the file, if the file can't be found, it will return an empty string.
*/
virtual std::string getFullPathForDirectoryAndFilename(const std::string& directory, const std::string& filename) const;
/** Dictionary used to lookup filenames based on a key.
* It is used internally by the following methods:
*
* std::string fullPathForFilename(const char*);
*
* @since v2.1
*/
ValueMap _filenameLookupDict;
/**
* The vector contains resolution folders.
* The lower index of the element in this vector, the higher priority for this resolution directory.
*/
std::vector<std::string> _searchResolutionsOrderArray;
/**
* The vector contains search paths.
* The lower index of the element in this vector, the higher priority for this search path.
*/
std::vector<std::string> _searchPathArray;
/**
* The default root path of resources.
* If the default root path of resources needs to be changed, do it in the `init` method of FileUtils's subclass.
* For instance:
* On Android, the default root path of resources will be assigned with "assets/" in FileUtilsAndroid::init().
* Similarly on Blackberry, we assign "app/native/Resources/" to this variable in FileUtilsBlackberry::init().
*/
std::string _defaultResRootPath;
/**
* The full path cache. When a file is found, it will be added into this cache.
* This variable is used for improving the performance of file search.
*/
mutable std::unordered_map<std::string, std::string> _fullPathCache;
/**
* Writable path.
*/
std::string _writablePath;
/**
* The singleton pointer of FileUtils.
*/
static FileUtils* s_sharedFileUtils;
};
// end of support group
/** @} */
NS_CC_END
#endif // __CC_FILEUTILS_H__
jsb.fileUtils常用API
jsb将整个C/C++ 导出的绑定在javascript bind的代表,整个C/C++ 导出的绑定都在这个jsb里面,jsb 支持native，不支持h5（浏览器上无法运行jsb is not defined）。jsb.fileUtils来获取文件读写工具类的实例。
// 获取文件的可写目录,是一个内部存储的目录，手机会为每个APP分配一个可读写的路径，但是这个App如果卸载以后，这个数据也会被删除;
jsb.fileUtils.getWritablePath();
// 获取文本数据，返回一个data String对象
jsb.fileUtils.getStringFromFile(filename);
// 写文本文件，返回是否成功
jsb.fileUtils.writeStringToFile(dataStr,fullPath);
// 获取二进制数据，返回一个Uint8Array文本对象
jsb.fileUtils.getDataFromFile(filename);
// 写二进制数据，返回是否成功
jsb.fileUtils.writeDataToFile(data,fullPath)
// 判断路径是否存在
jsb.fileUtils.isDirectoryExist(dirPath);
// 创建一个路径
jsb.fileUtils.createDirectory(dirPath);
// 删除掉一个路径
jsb.fileUtils.removeDirectory(dirPath);
// 删除掉一个文件
jsb.fileUtils.removeFile(filepath);
// 等等
例子
cc.Class({
extends: cc.Component,
properties: {
},
onLoad: function () {
// jsb.fileUtils获取全局的工具类的实例, cc.director;
// 如果是在电脑的模拟器上，就会是安装路径下模拟器的位置;
// 如果是手机上，那么就是手机OS为这个APP分配的可以读写的路径;
// jsb --> javascript binding --> jsb是不支持h5的
var writeable_path = jsb.fileUtils.getWritablePath();
console.log(writeable_path);
// 要在可写的路径先创建一个文件夹
var new_dir = writeable_path + "new_dir";
// 路径也可以是 外部存储的路径，只要你有可写外部存储的权限;
// getWritablePath这个路径下，会随着我们的程序卸载而删除,外部存储除非你自己删除，否者的话，卸载APP数据还在;
if(!jsb.fileUtils.isDirectoryExist(new_dir)) {
jsb.fileUtils.createDirectory(new_dir);
}
else {
console.log("dir is exist!!!");
}
// 读写文件我们分两种,文本文件, 二进制文件;
// (1)文本文件的读,返回的是一个string对象
var str_data = jsb.fileUtils.getStringFromFile(new_dir + "/test_str_read.txt");
console.log(str_data);
str_data = "hello test_write !!!!!"
jsb.fileUtils.writeStringToFile(str_data, new_dir + "/test_str_write.txt");
// (2)二进制文件的读写, Uint8Array --> js对象
var bin_array = jsb.fileUtils.getDataFromFile(new_dir + "/test_bin_read.png");
console.log(bin_array[0], bin_array[1]); // 使用这个就能访问二进制的每一个字节数据;
jsb.fileUtils.writeDataToFile(bin_array, new_dir + "/test_bin_write.png");
// end
// 删除文件和文件夹
// jsb.fileUtils.removeFile(new_dir + "/test_bin_write.png");
// jsb.fileUtils.removeDirectory(new_dir);
},
});
