在iPhone中讀取和寫入文件

Question

如何在iPhone上進行文件讀/寫操作？這是我需要指定保存文件的路徑？我怎樣才能得到iPhone中的當前工作目錄？

謝謝

Answer 1

寫入文件：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 

// the path to write file 
NSString *myFile = [documentsDirectory stringByAppendingPathComponent:@"myFile"]; 

[data writeToFile:myFile atomically:YES]; 

閱讀文件：

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"MyFile" ofType:@"txt"]; 
NSData *myData = [NSData dataWithContentsOfFile:filePath]; 
if (myData) { 
    // do something useful 
}