ios开发之 -- NSData 和 NSString , UIImage 等之间的互转

     //NSData转换为UIImage
     NSData *imageData = [NSData dataWithContentsOfFile: imagePath];
     UIImage *image = [UIImage imageWithData: imageData];  

     //UIImage转换为NSData
     NSData *imageData = UIImagePNGRepresentation(aimae);  

. 字符串转Data

NSString * str =@"str"; 

NSData *data =[str dataUsingEncoding:NSUTF8StringEncoding];

.NSData 转NSString

NSString * str  =[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

.data 转char

NSData *data; 

char * haha=[data bytes]; 

. char 转data 

byte * byteData = malloc(sizeof(byte)*); 

NSData *content=[NSData dataWithBytes:byteData length:];

纯属记录!