iphone 文件操作

1：createDirectoryAtPath 创建目录

- (bool)createPath:(NSString *)fileName

{

NSArray
*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [paths objectAtIndex:0];

if (!documentDirectory)

{

return false;

}

NSString *FilePath = [[documentDirectory stringByAppendingString:@"/"] stringByAppendingString:fileName];

if ([[NSFileManager defaultManager]fileExistsAtPath:FilePath])

{

return true;

}

[[NSFileManager defaultManager] createDirectoryAtPath:FilePath attributes:nil];

if ([[NSFileManager defaultManager]fileExistsAtPath:FilePath])

{

return true;

}

return false;

}

2：读取指定文件夹下的所有文件名称 fileExistsAtPath

- (bool)readSignature:(NSString *)filePath

{

NSArray
*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [paths objectAtIndex:0];

if (!documentDirectory)

{

return false;

}

NSString *FilePath = [[documentDirectory stringByAppendingString:@"/"] stringByAppendingString:filePath];

if (![[NSFileManager defaultManager]fileExistsAtPath:FilePath])

{

return false;

}

NSArray *files
= [[NSFileManager defaultManager] directoryContentsAtPath:FilePath];

if (signArray)

{

[signArray release];

signArray = nil;

}

signArray =
[[NSMutableArray alloc] init];

[signArray addObjectsFromArray:files];

return true;

}

3：读取和保存二进制文件

- (bool) writeApplicationData:(NSData *)data writeFileName:(NSString *)fileName

{

if (!fileName)

{

return false;

}

NSArray *paths
= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [paths objectAtIndex:0];

NSString *FilePath = [documentDirectory stringByAppendingString:@"/signature/"];

if (!FilePath)

{

return false;

}

NSString *appFile = [FilePath stringByAppendingPathComponent:fileName];

return ([data writeToFile:appFile atomically:YES]);

}

-(id) readApplicationData:(NSString *)fileName

{

NSArray *paths
= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentDirectory = [paths objectAtIndex:0];

NSString *FilePath = [[documentDirectory stringByAppendingString:@"/signature/"] stringByAppendingString:fileName];

NSData *myData
= [[[NSData alloc] initWithContentsOfFile:FilePath] autorelease];

return myData;

}

http://www.cocoachina.com/blog/article.php?type=blog&itemid=1105