Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
来源:互联网 发布:桌面数据恢复 编辑:程序博客网 时间:2024/05/16 05:20
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
1 - (NSString *)filePathWithName:(NSString *)filename 2 { 3 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 4 NSString *documentsDirectory = [paths objectAtIndex:0]; 5 return [documentsDirectory stringByAppendingPathComponent:filename]; 6 } 7 8 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 9 //音频文件路径10 NSString *mp3Path1 = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp3"];11 NSString *mp3Path2 = [[NSBundle mainBundle] pathForResource:@"2" ofType:@"mp3"];12 //音频数据13 NSData *sound1Data = [[NSData alloc] initWithContentsOfFile: mp3Path1];14 NSData *sound2Data = [[NSData alloc] initWithContentsOfFile: mp3Path2];15 //合并音频16 NSMutableData *sounds = [NSMutableData alloc];17 [sounds appendData:sound1Data];18 [sounds appendData:sound2Data];19 //保存音频20 21 NSLog(@"data length:%d", [sounds length]);22 23 [sounds writeToFile:[self filePathWithName:@"tmp.mp3"] atomically:YES];24 25 [window makeKeyAndVisible];26 27 return YES;28 }
6,NSString 合并
1 NSString* string; // 结果字符串2 NSString* string1, string2; //已存在的字符串,需要将string1和string2连接起来3 //方法1. 4 string = [NSString initWithFormat:@"%@,%@", string1, string2 ];5 //方法2. 6 string = [string1 stringByAppendingString:string2];7 //方法3 . 8 string = [string stringByAppendingFormat:@"%@,%@",string1, string2];
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage NSMutableData
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- Object-C 中各数据类型转换 NSData NSMutableData NSString Byte UIImage 合并音频
- Object-C 中各数据类型转换 NSData NSMutableData NSString Byte UIImage 合并音频
- ios中各数据类型转换 NSData转NSString,Byte,UIImage
- Database Validation数据库验证
- Android混淆的一些坑儿
- MySql 日期时间函数
- 在CentOS7中安装mongodb
- Android文件存储之SharedPreferences
- Object-C 中各数据类型转换 NSData转NSString,Byte,UIImage
- 截面数据 缺少行业风险
- 从关系型数据库到非关系型数据库
- Activity基础----------
- LabVIEW波形图(waveform chart)
- 减小NSIS安装包体积的方法
- Qt设置QLabel中字体的颜色
- NumPy中的基本数据类型
- 管理Linux服务器