iOS 蓝牙 字符串转byte转data
来源:互联网 发布:超级基因优化液贴吧 编辑:程序博客网 时间:2024/06/05 02:10
需求:字符串AD4532692D30AF836C75FA343ABC5A7E 转为16位的data :< af306769 2d30af83 6c75fa53 5abc9a3e >
原理 先转为byte 再转为data
第一种方法:
- (void)strToData{ NSString *strtest =@"AD4532692D30AF836C75FA343ABC5A7E"; //以及初始化的Byte数组 Byte bt[16] = {0}; for (int i =0; i < strtest.length; i+=2) { NSString *strByte = [strtest substringWithRange:NSMakeRange(i,2)]; unsigned red = strtoul([strByte UTF8String],0,16); Byte b = (Byte) ((0xff & red) );//( Byte) 0xff&iByte; bt[i/2+0] = b; } NSLog(@"%hhu",bt[0]); NSData *adata3 = [[NSData alloc] initWithBytes:bt length:16]; NSLog(@"data 3 = %@",adata3);}
第二种方法
-(NSData*) strToDataWithString :(NSString *)te{ NSMutableData* data = [NSMutableData data]; int idx; for (idx = 0; idx+2 <= te.length; idx+=2) { NSRange range = NSMakeRange(idx, 2); NSString* hexStr = [te substringWithRange:range]; NSScanner* scanner = [NSScanner scannerWithString:hexStr]; unsigned int intValue; [scanner scanHexInt:&intValue]; [data appendBytes:&intValue length:1]; } return data;}
笔记:ios 中Nsstirng,Nsdata,char,byte,UIImage 之间的转换
1.NSData 与 NSString
NSDate->NSString
NSString *testString =[[NSString alloc] initWithData:testData encoding:NSUTF8StringEncoding];
NSString ->NSData
NSData *aData =[aString dataUsingEncoding:NSUTF8StringEncoding];
2.NSData 与char
NSData->char*
char *test=(char*)[data bytes];
char ->byte
for (int i=0;i<strlen(test);i++) printf("%02X",test[i]&0xff);//16进制
char*->NSData
byte *testData =malloc(sizeOf(byte)*16); NSData *content =[NSData dataWithBytes:tempData length:16];
3.byte与NSData
NSData->Byte数组
NSString *testString = @"1234567890"; NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding]; Byte *testByte = (Byte*)[testData bytes]; for(int i=0;i<[testDatalength];i++) printf("testByte = %d ",testByte[i]);
Byte数组-> 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];
Byte数组->16进制数
Byte *bytes = (Byte *)[aData bytes]; NSString *hexStr=@""; for(int i=0;i<[encryDatalength];i++) { NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0 xff]; ///16进制数 if([newHexStr length]==1) hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr]; else hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr]; } NSLog(@"bytes 的16进制数为:%@",hexStr);
16进制数->Byte数组
///// 将16进制数据转化成Byte 数组 NSString *hexString = @"3e435fab9c34891f";//16进制字符串 int j=0; Byte bytes[128]; ///3ds key的Byte数组, 128位 for(int i=0;i<[hexString length];i++) { int int_ch; /// 两位16进制数转化后的10进制数 unichar hex_char1 = [hexString characterAtIndex:i]; ////两位16进制数中的第一位(高位*16) int int_ch1; if(hex_char1 >= ""0"" &&hex_char1 <=""9"") int_ch1 = (hex_char1-48)*16; ////0 的Ascll - 48 else if(hex_char1 >= ""A"" &&hex_char1 <=""F"") int_ch1 = (hex_char1-55)*16;//// A 的Ascll - 65 else int_ch1 = (hex_char1-87)*16;//// a 的Ascll - 97 i++; unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位) int int_ch2; if(hex_char2 >= ""0"" &&hex_char2 <=""9"") int_ch2 = (hex_char2-48);//// 0 的Ascll - 48 else if(hex_char1 >= ""A"" &&hex_char1 <=""F"") int_ch2 = hex_char2-55; //// A 的Ascll - 65 else int_ch2 = hex_char2-87; //// a 的Ascll - 97 int_ch = int_ch1+int_ch2; NSLog(@"int_ch=%d",int_ch); bytes[j] = int_ch; ///将转化后的数放入Byte数组里 j++; } NSData *newData = [[NSData alloc] initWithBytes:bytes length:128]; NSLog(@"newData=%@",newData);
4.NSData 与UIImage
NSData ->UIImage
UIImage *testImage =[UIImage imageWithData:testImageData];
//从本地文件沙盒中取并转化为NSData
NSString *path =[[NSBundle mainBundle] bundlePath]; NSString *name =[NSString stringWithFormat:@"testImage.png"]; NSString *finalPath =[path stringByAppendingPathComponent:name]; NSData *imageData =[NSData dataWithContentFile:finalPath]; UIimage *testImage =[UIimage imageWithData:ImageData];
UIImage->NSData
NSData *imageData =UIImagePNGRepresentation(testImage);
参考来源:http://blog.csdn.net/wscqqlucy/article/details/8268412
http://www.th7.cn/Program/IOS/201505/450971.shtml
阅读全文
0 0
- iOS 蓝牙 字符串转byte转data
- ios十进制、十六进制字符串,byte,data等之间的转换
- ios十进制、十六进制字符串,byte,data等之间的转换
- iOS NSData 转 字符串 (蓝牙特征值转字符串)
- delphi BYTE 转字符串
- BYTE 转字符串
- String字符串转Byte
- JS字符串转Byte[]
- C++ BYTE数组转字符串
- byte[]转字符串编码问题
- java byte转二进制字符串
- java byte转二进制字符串
- java byte转二进制字符串
- ios data转换成16进制字符串以及16进制字符串转data
- Java中Byte型转字符串
- 16进制字符串转byte数组
- hex字符串与byte数组互转
- 字符串、十六进制、byte数组互转
- 分布式调度框架TBSchedule 分布式架构
- js操作json 总结
- ffmpeg(搭建简单直播系统)
- 《我不原谅》书评
- 如何让 Xcode 在读写上提速100倍?
- iOS 蓝牙 字符串转byte转data
- [机器学习入门] 李宏毅机器学习笔记-5(Classification- Probabilistic Generative Model;分类:概率生成模型)
- 专家系统实验
- C++11中std::forward_list单向链表的使用
- 前馈神经网络基础教程
- iOS UIWebView与JavaScript交互之JavaScriptCore
- Thread、AsycTask、IntentService的使用场景与特点
- 通过实例全面解析JS中的This
- 利用Oh-My-Zsh打造你的超级终端