NSData 与NSString Byte UIImage之间的转换

最新推荐文章于 2017-11-16 19:20:35 发布

原创最新推荐文章于 2017-11-16 19:20:35 发布 · 605 阅读

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#uiimage #byte #nsstring #nsdata

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本文详细介绍了NSData与其他几种常见数据类型之间的转换方法，包括NSString、Byte、UIImage和NSMutableData等，并提供具体的代码示例，帮助开发者更好地理解和应用这些转换。

1，NSData 与 NSString
　　NSData –> NSString
　　NSString *aString = [[NSString alloc] initWithData:adata encoding:NSUTF8StringEncoding];
　　NSString –> NSData
　　NSString *aString = @”1234”;
　　NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding];
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];
　　//例：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];
//保存音频
```
 NSLog(@"data length:%d", [sounds length]);

 [sounds writeToFile:[self filePathWithName:@"tmp.mp3"] atomically:YES];

 [window makeKeyAndVisible];
```
return YES;
}