读取文件内容到NSString

读取文件内容到NSString，我使用以下代码

[cpp]
NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"push实现.txt"];

   NSError* err=nil;
   NSString* mTxt=[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&err];

   NSLog(@"err:%@",err);

   NSLog(@"filePath:%@",filePath);
   NSLog(@"mTxt:%@",mTxt);

NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"push实现.txt"];

    NSError* err=nil;
    NSString* mTxt=[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&err];

    NSLog(@"err:%@",err);

    NSLog(@"filePath:%@",filePath);
    NSLog(@"mTxt:%@",mTxt);

出错了，log为：

[plain]
2013-05-23 12:35:36.374 Paging[26149:11303] err:Error Domain=NSCocoaErrorDomain Code=261 "The operation couldn’t be completed. (Cocoa error 261.)" UserInfo=0x8868b00 {NSFilePath=/Users/ericyang/Library/Application Support/iPhone Simulator/6.1/Applications/A3D216E7-DC10-48C3-AD40-302573D8C069/Paging.app/push实现.txt, NSStringEncoding=4}
2013-05-23 12:35:36.375 Paging[26149:11303] filePath:/Users/ericyang/Library/Application Support/iPhone Simulator/6.1/Applications/A3D216E7-DC10-48C3-AD40-302573D8C069/Paging.app/push实现.txt
2013-05-23 12:35:36.375 Paging[26149:11303] mTxt:(null)

2013-05-23 12:35:36.374 Paging[26149:11303] err:Error Domain=NSCocoaErrorDomain Code=261 "The operation couldn’t be completed. (Cocoa error 261.)" UserInfo=0x8868b00 {NSFilePath=/Users/ericyang/Library/Application Support/iPhone Simulator/6.1/Applications/A3D216E7-DC10-48C3-AD40-302573D8C069/Paging.app/push实现.txt, NSStringEncoding=4}
2013-05-23 12:35:36.375 Paging[26149:11303] filePath:/Users/ericyang/Library/Application Support/iPhone Simulator/6.1/Applications/A3D216E7-DC10-48C3-AD40-302573D8C069/Paging.app/push实现.txt
2013-05-23 12:35:36.375 Paging[26149:11303] mTxt:(null)
找到原因，是编码问题，我的文件应该是GBK的，修改代码：

[cpp]
NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"push实现.txt"];

   unsigned long encode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
   NSData *responseData = [NSData dataWithContentsOfFile:filePath];
   NSString *mTxt = [[NSString alloc] initWithData:responseData encoding:encode];

   NSLog(@"filePath:%@",filePath);
   NSLog(@"mTxt:%@",mTxt);

NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"push实现.txt"];

    unsigned long encode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSData *responseData = [NSData dataWithContentsOfFile:filePath];
    NSString *mTxt = [[NSString alloc] initWithData:responseData encoding:encode];

    NSLog(@"filePath:%@",filePath);
    NSLog(@"mTxt:%@",mTxt);

ok，正常打印。

补充：移动开发 , IOS ,