NSFileManager
此类主要是对文件进行的操作以及文件信息的获取
判断文件是否存在于某个路径中
+ (BOOL)fileIsExistOfPath:(NSString *)filePath
{
BOOL flag = NO;
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:filePath]) {
flag = YES;
} else {
flag = NO;
}
return flag;
}
从某个路径中移除文件
+ (BOOL)removeFileOfPath:(NSString *)filePath
{
BOOL flag = YES;
NSFileManager *fileManage = [NSFileManager defaultManager];
if ([fileManage fileExistsAtPath:filePath]) {
if (![fileManage removeItemAtPath:filePath error:nil]) {
flag = NO;
}
}
return flag;
}
从URL路径中移除文件
- (BOOL)removeFileOfURL:(NSURL *)fileURL
{
BOOL flag = YES;
NSFileManager *fileManage = [NSFileManager defaultManager];
if ([fileManage fileExistsAtPath:fileURL.path]) {
if (![fileManage removeItemAtURL:fileURL error:nil]) {
flag = NO;
}
}
return flag;
}
创建文件夹
+(BOOL)creatDirectoryWithPath:(NSString *)dirPath
{
BOOL ret = YES;
BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:dirPath];
if (!isExist) {
NSError *error;
BOOL isSuccess = [[NSFileManager defaultManager] createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
if (!isSuccess) {
ret = NO;
NSLog(@"creat Directory Failed. errorInfo:%@",error);
}
}
return ret;
}
创建文件
+ (BOOL)creatFileWithPath:(NSString *)filePath
{
BOOL isSuccess = YES;
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL temp = [fileManager fileExistsAtPath:filePath];
if (temp) {
return YES;
}
NSError *error;
//stringByDeletingLastPathComponent:删除最后一个路径节点
NSString *dirPath = [filePath stringByDeletingLastPathComponent];
isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
if (error) {
NSLog(@"creat File Failed. errorInfo:%@",error);
}
if (!isSuccess) {
return isSuccess;
}
isSuccess = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
return isSuccess;
}
保存文件
+ (BOOL)saveFile:(NSString *)filePath withData:(NSData *)data
{
BOOL ret = YES;
ret = [self creatFileWithPath:filePath];
if (ret) {
ret = [data writeToFile:filePath atomically:YES];
if (!ret) {
NSLog(@"%s Failed",__FUNCTION__);
}
} else {
NSLog(@"%s Failed",__FUNCTION__);
}
return ret;
}
移动文件
+ (BOOL)moveFileFromPath:(NSString *)fromPath toPath:(NSString *)toPath
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:fromPath]) {
NSLog(@"Error: fromPath Not Exist");
return NO;
}
if (![fileManager fileExistsAtPath:toPath]) {
NSLog(@"Error: toPath Not Exist");
return NO;
}
NSString *headerComponent = [toPath stringByDeletingLastPathComponent];
if ([self creatFileWithPath:headerComponent]) {
return [fileManager moveItemAtPath:fromPath toPath:toPath error:nil];
} else {
return NO;
}
}
拷贝文件
+(BOOL)copyFileFromPath:(NSString *)fromPath toPath:(NSString *)toPath
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:fromPath]) {
NSLog(@"Error: fromPath Not Exist");
return NO;
}
if (![fileManager fileExistsAtPath:toPath]) {
NSLog(@"Error: toPath Not Exist");
return NO;
}
NSString *headerComponent = [toPath stringByDeletingLastPathComponent];
if ([self creatFileWithPath:headerComponent]) {
return [fileManager copyItemAtPath:fromPath toPath:toPath error:nil];
} else {
return NO;
}
}
获取文件夹下文件列表
+ (NSArray *)getFileListInFolderWithPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *fileList = [fileManager contentsOfDirectoryAtPath:path error:&error];
if (error) {
NSLog(@"getFileListInFolderWithPathFailed, errorInfo:%@",error);
}
return fileList;
}
获取文件大小
+ (long long)getFileSizeWithPath:(NSString *)path
{
unsigned long long fileLength = 0;
NSNumber *fileSize;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
if ((fileSize = [fileAttributes objectForKey:NSFileSize])) {
fileLength = [fileSize unsignedLongLongValue]; //单位是 B
}
return fileLength / 1000; 换算为K
}
获取文件创建时间
+ (NSString *)getFileCreatDateWithPath:(NSString *)path
{
NSString *date = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
date = [fileAttributes objectForKey:NSFileCreationDate];
return date;
}
获取文件所有者
+ (NSString *)getFileOwnerWithPath:(NSString *)path
{
NSString *fileOwner = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
fileOwner = [fileAttributes objectForKey:NSFileOwnerAccountName];
return fileOwner;
}
获取文件更改日期
+ (NSString *)getFileChangeDateWithPath:(NSString *)path
{
NSString *date = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
date = [fileAttributes objectForKey:NSFileModificationDate];
return date;
}
NSFileHandle
此类主要是对文件内容进行读取和写入操作
// 打开一个文件准备读取
+ (id)fileHandleForReadingAtPath:(NSString *)path
// 打开一个文件准备写入
+ (id)fileHandleForWritingAtPath:(NSString *)path
// 打开一个文件准备更新
+ (id)fileHandleForUpdatingAtPath:(NSString *)path
// 从设备或通道返回可用的数据
- (NSData *)availableData;
// 从当前的节点读取到文件的末尾
- (NSData *)readDataToEndOfFile;
// 从当前节点开始读取指定的长度
- (NSData *)readDataOfLength:(NSUInteger)length;
// 写入数据
- (void)writeData:(NSData *)data;
// 获取当前文件的偏移量
- (unsigned long long)offsetInFile;
// 跳到指定文件的偏移量
- (void)seekToFileOffset:(unsigned long long)offset;
// 跳到文件末尾
- (unsigned long long)seekToEndOfFile;
// 将文件的长度设为offset字节
- (void)truncateFileAtOffset:(unsigned long long)offset;
// 关闭文件
- (void)closeFile;
NSFileHandle使用介绍
向文件追加数据
+ (BOOL)appendData:(NSData *)data withPath:(NSString *)path
{
BOOL result = [self creatFileWithPath:path];
if (result) {
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:path];
[handle seekToEndOfFile]; 将节点跳到文件的末尾
[handle writeData:data]; 追加写入数据
[handle synchronizeFile]; 同步文件
[handle closeFile]; 关闭文件
return YES;
} else {
NSLog(@"%s Failed",__FUNCTION__);
return NO;
}
}
//获取文件
+ (NSData *)getFileData:(NSString *)filePath
{
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:filePath];
NSData *fileData = [handle readDataToEndOfFile];
[handle closeFile];
return fileData;
}
//读取文件
+ (NSData *)getFileData:(NSString *)filePath startIndex:(long long)startIndex length:(NSInteger)length
{
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:filePath];
[handle seekToFileOffset:startIndex];
NSData *data = [handle readDataOfLength:length];
[handle closeFile];
return data;
}
说明: 我们对于一般的图片资源的储存,一般都是将图片转成二进制数据,然后写入到特定文件夹下的
// stringByAppendingPathComponent 拼接一个文件路径会自动在前面加上 '/'
NSString * filePath = [path stringByAppendingPathComponent:@"admin.plist"];
复制文件
NSFileHandle *infile, *outfile; 输入文件、输出文件
NSData *buffer; 读取的缓冲数据
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *homePath = NSHomeDirectory( );
NSString *sourcePath = [homePath stringByAppendingPathComponent:@"testfile.txt"]; 源文件路径
NSString *outPath = [homePath stringByAppendingPathComponent:@"outfile.txt"]; 输出文件路径
BOOL sucess = [fileManager createFileAtPath:outPath contents:nil attributes:nil];
if (!success){
return N0;
}
infile = [NSFileHandle fileHandleForReadingAtPath:sourcePath]; 创建读取源路径文件
if (infile == nil){
return NO;
}
outfile = [NSFileHandle fileHandleForReadingAtPath:outPath];创建并打开要输出的文件
if (outfile == nil){
return NO;
}
[outfile truncateFileAtOffset:0]; 将输出文件的长度设为0
buffer = [infile readDataToEndOfFile]; 读取数据
[outfile writeData:buffer]; 写入输入
[infile closeFile]; 关闭写入、输入文件
[outfile closeFile]；
