NSFileManager
此類主要是對(duì)文件進(jìn)行的操作以及文件信息的獲取
判斷文件是否存在于某個(gè)路徑中
+ (BOOL)fileIsExistOfPath:(NSString *)filePath
{
BOOL flag = NO;
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:filePath]) {
flag = YES;
} else {
flag = NO;
}
return flag;
}
從某個(gè)路徑中移除文件
+ (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;
}
從URL路徑中移除文件
- (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;
}
創(chuàng)建文件夾
+(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;
}
創(chuàng)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:刪除最后一個(gè)路徑節(jié)點(diǎn)
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;
}
移動(dòng)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;
}
}
拷貝文件
+(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;
}
}
獲取文件夾下文件列表
+ (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;
}
獲取文件大小
+ (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]; //單位是 B
}
return fileLength / 1000; 換算為K
}
獲取文件創(chuàng)建時(shí)間
+ (NSString *)getFileCreatDateWithPath:(NSString *)path
{
NSString *date = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
date = [fileAttributes objectForKey:NSFileCreationDate];
return date;
}
獲取文件所有者
+ (NSString *)getFileOwnerWithPath:(NSString *)path
{
NSString *fileOwner = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
fileOwner = [fileAttributes objectForKey:NSFileOwnerAccountName];
return fileOwner;
}
獲取文件更改日期
+ (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
此類主要是對(duì)文件內(nèi)容進(jìn)行讀取和寫入操作
// 打開一個(gè)文件準(zhǔn)備讀取
+ (id)fileHandleForReadingAtPath:(NSString *)path
// 打開一個(gè)文件準(zhǔn)備寫入
+ (id)fileHandleForWritingAtPath:(NSString *)path
// 打開一個(gè)文件準(zhǔn)備更新
+ (id)fileHandleForUpdatingAtPath:(NSString *)path
// 從設(shè)備或通道返回可用的數(shù)據(jù)
- (NSData *)availableData;
// 從當(dāng)前的節(jié)點(diǎn)讀取到文件的末尾
- (NSData *)readDataToEndOfFile;
// 從當(dāng)前節(jié)點(diǎn)開始讀取指定的長(zhǎng)度
- (NSData *)readDataOfLength:(NSUInteger)length;
// 寫入數(shù)據(jù)
- (void)writeData:(NSData *)data;
// 獲取當(dāng)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;
// 將文件的長(zhǎng)度設(shè)為offset字節(jié)
- (void)truncateFileAtOffset:(unsigned long long)offset;
// 關(guān)閉文件
- (void)closeFile;
NSFileHandle使用介紹
向文件追加數(shù)據(jù)
+ (BOOL)appendData:(NSData *)data withPath:(NSString *)path
{
BOOL result = [self creatFileWithPath:path];
if (result) {
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:path];
[handle seekToEndOfFile]; 將節(jié)點(diǎn)跳到文件的末尾
[handle writeData:data]; 追加寫入數(shù)據(jù)
[handle synchronizeFile]; 同步文件
[handle closeFile]; 關(guān)閉文件
return YES;
} else {
NSLog(@"%s Failed",__FUNCTION__);
return NO;
}
}
//獲取文件
+ (NSData *)getFileData:(NSString *)filePath
{
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:filePath];
NSData *fileData = [handle readDataToEndOfFile];
[handle closeFile];
return fileData;
}
//讀取文件
+ (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;
}
說明: 我們對(duì)于一般的圖片資源的儲(chǔ)存,一般都是將圖片轉(zhuǎn)成二進(jìn)制數(shù)據(jù),然后寫入到特定文件夾下的
// stringByAppendingPathComponent 拼接一個(gè)文件路徑會(huì)自動(dòng)在前面加上 '/'
NSString * filePath = [path stringByAppendingPathComponent:@"admin.plist"];
復(fù)制文件
NSFileHandle *infile, *outfile; 輸入文件忱反、輸出文件
NSData *buffer; 讀取的緩沖數(shù)據(jù)
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *homePath = NSHomeDirectory( );
NSString *sourcePath = [homePath stringByAppendingPathComponent:@"testfile.txt"]; 源文件路徑
NSString *outPath = [homePath stringByAppendingPathComponent:@"outfile.txt"]; 輸出文件路徑
BOOL sucess = [fileManager createFileAtPath:outPath contents:nil attributes:nil];
if (!success){
return N0;
}
infile = [NSFileHandle fileHandleForReadingAtPath:sourcePath]; 創(chuàng)建讀取源路徑文件
if (infile == nil){
return NO;
}
outfile = [NSFileHandle fileHandleForReadingAtPath:outPath];創(chuàng)建并打開要輸出的文件
if (outfile == nil){
return NO;
}
[outfile truncateFileAtOffset:0]; 將輸出文件的長(zhǎng)度設(shè)為0
buffer = [infile readDataToEndOfFile]; 讀取數(shù)據(jù)
[outfile writeData:buffer]; 寫入輸入
[infile closeFile]; 關(guān)閉寫入、輸入文件
[outfile closeFile]笼吟；
