iPhone 文件讀寫操作

1，寫文件操作

- (IBAction)btnWrite:(id)sender {//創建文件管理器NSFileManager *fileManager = [NSFileManager defaultManager];//獲取路徑//參數 要獲取的哪種路徑NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentDirectory = [paths objectAtIndex:0];//去除需要的路徑//更改到操作的目錄下[fileManager changeCurrentDirectoryPath:[documentDirectory stringByExpandingTildeInPath]];//創建文件fileName文件名稱，contents文件內容，如果開始沒有內容可以設置為nil，attributes文件的屬性,初始為nil[fileManager createFileAtPath:@"fileName" contents:nil attributes:nil];//刪除待刪除文件[fileManager removeItemAtPath:@"createNewFile" error:nil];//獲取文件路徑NSString *path = [documentDirectory stringByAppendingPathComponent:@"fileName"];NSLog(@"path == %@",path);//待寫入的數據NSString *temp = @"Hello world";int data0 = 1000000;float data2 = 23.23f;//創建數據緩沖NSMutableData *writer = [[NSMutableData alloc]init];//將字符串添加到緩沖中[writer appendData:[temp dataUsingEncoding:NSUTF8StringEncoding]];[writer appendBytes:&data0 length:sizeof(data0)];[writer appendBytes:&data2 length:sizeof(data2)];[writer writeToFile:path atomically:YES];[writer release]; }

2，讀文件操作

- (IBAction)btnRead:(id)sender {//創建文件管理器NSFileManager *fileManager = [NSFileManager defaultManager];//獲取路徑//參數 要獲取的哪種路徑NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentDirectory = [paths objectAtIndex:0];//去除需要的路徑//更改到操作的目錄下[fileManager changeCurrentDirectoryPath:[documentDirectory stringByExpandingTildeInPath]];//創建文件fileName文件名稱，contents文件內容，如果開始沒有內容可以設置為nil，attributes文件的屬性,初始為nil[fileManager createFileAtPath:@"fileName" contents:nil attributes:nil];//刪除待刪除文件[fileManager removeItemAtPath:@"createNewFile" error:nil];//獲取文件路徑NSString *path = [documentDirectory stringByAppendingPathComponent:@"fileName"];NSLog(@"path == %@",path);//待寫入的數據NSString *temp = @"Hello world";int data0 = 1000000;float data2 = 23.23f;//創建數據緩沖NSMutableData *writer = [[NSMutableData alloc]init];//將字符串添加到緩沖中[writer appendData:[temp dataUsingEncoding:NSUTF8StringEncoding]];[writer appendBytes:&data0 length:sizeof(data0)];[writer appendBytes:&data2 length:sizeof(data2)];[writer writeToFile:path atomically:YES];[writer release];//讀取操作int gData0;float gData1;NSString *gData2;NSData *reader = [NSData dataWithContentsOfFile:path];gData2 = [[NSString alloc]initWithData:[reader subdataWithRange:NSMakeRange(0, [temp length])] encoding:NSUTF8StringEncoding];[reader getBytes:&gData0 range:NSMakeRange([temp length], sizeof(gData0))];[reader getBytes:&gData1 range:NSMakeRange([temp length]+ sizeof(gData0) , sizeof(gData1))];NSLog(@"gData0 == %d",gData0);NSLog(@"gData1 == %f",gData1);NSLog(@"gData2 == %@",gData2);// lblText.text = gData2;}

?iphone實現文件的讀寫操作

iphone可以很容易的實現文件的讀寫,但是如果你沒有使用蘋果公司99美元開發者sdk的話,你利用破解打出來的api包,安裝到手機上不能把文件寫入手機.下面是我實現讀寫的代碼:

#import "ManagerFile.h"@implementation ManagerFile-(void)writeFile:(NSString *)file { //創建文件管理器 NSFileManager *fileManager = [NSFileManager defaultManager]; //獲取路徑 //參數NSDocumentDirectory要獲取那種路徑 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0];//去處需要的路徑 //更改到待操作的目錄下 [fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]]; //創建文件fileName文件名稱，contents文件的內容，如果開始沒有內容可以設置為nil，attributes文件的屬性，初始為nil //獲取文件路徑 [fileManager removeItemAtPath:@"username" error:nil]; NSString *path = [documentsDirectory stringByAppendingPathComponent:@"username"]; //創建數據緩沖 NSMutableData *writer = [[NSMutableData alloc] init]; //將字符串添加到緩沖中 [writer appendData:[file dataUsingEncoding:NSUTF8StringEncoding]]; //將其他數據添加到緩沖中 //將緩沖的數據寫入到文件中 [writer writeToFile:path atomically:YES]; [writer release]; } -(NSString *)readFile { //創建文件管理器 NSFileManager *fileManager = [NSFileManager defaultManager]; //獲取路徑 //參數NSDocumentDirectory要獲取那種路徑 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0];//去處需要的路徑 //更改到待操作的目錄下 [fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]]; //獲取文件路徑 NSString *path = [documentsDirectory stringByAppendingPathComponent:@"username"]; NSData *reader = [NSData dataWithContentsOfFile:path]; return [[NSString alloc] initWithData:reader encoding:NSUTF8StringEncoding]; } @end

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