Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
2013-11-13 21:43
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转:http://www.cnblogs.com/cpcpc/archive/2012/06/15/2550230.html 1,NSData 与 NSString NSData --> NSString NSString *aString = [[NSString alloc] initWithData:adata encoding:NSUTF8StringEncoding]; NSString --> NSData NSString *aString = @"1234"; NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding]; //将string转换为指定编码 NSString *buf = [[[NSString alloc] initWithData:data encoding:encodin] autorelease]; 2,NSData 与 Byte NSData --> Byte NSString *testString = @"1234567890"; NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding]; Byte *testByte = (Byte *)[testData bytes]; Byte --> NSData Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23}; NSData *adata = [[NSData alloc] initWithBytes:byte length:24]; 3,NSData 与 UIImage NSData --> UIImage UIImage *aimage = [UIImage imageWithData: imageData]; //从本地文件沙盒中取图片并转换为NSData NSString *path = [[NSBundle mainBundle] bundlePath]; NSString *name = [NSString stringWithFormat:@"ceshi.png"]; NSString *finalPath = [path stringByAppendingPathComponent:name]; NSData *imageData = [NSData dataWithContentsOfFile: finalPath]; UIImage *aimage = [UIImage imageWithData: imageData]; UIImage-> NSData NSData *imageData = UIImagePNGRepresentation(aimae); 4,NSData 与 NSMutableData NSData --> MSMutableData NSData *data=[[NSData alloc]init]; NSMutableData *mdata=[[NSMutableData alloc]init]; mdata=[NSData dataWithData:data]; 5,NSData合并为一个NSMutableData - (NSString *)filePathWithName:(NSString *)filename{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; return [documentsDirectory stringByAppendingPathComponent:filename]; } - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //音频文件路径 NSString *mp3Path1 = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp3"]; NSString *mp3Path2 = [[NSBundle mainBundle] pathForResource:@"2" ofType:@"mp3"]; //音频数据 NSData *sound1Data = [[NSData alloc] initWithContentsOfFile: mp3Path1]; NSData *sound2Data = [[NSData alloc] initWithContentsOfFile: mp3Path2]; //合并音频 NSMutableData *sounds = [NSMutableData alloc]; [sounds appendData:sound1Data]; [sounds appendData:sound2Data]; NSLog(@"data length:%d", [sounds length]); //保存音频 [sounds writeToFile:[self filePathWithName:@"tmp.mp3"] atomically:YES]; [window makeKeyAndVisible]; return YES; } 6,NSString 合并 NSString* string; // 结果字符串 NSString* string1, string2; //已存在的字符串,需要将string1和string2连接起来 //方法1. string = [NSString initWithFormat:@"%@,%@", string1, string2 ]; //方法2. string = [string1 stringByAppendingString:string2]; //方法3 . string = [string stringByAppendingFormat:@"%@,%@",string1, string2];
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