NSString *dictString = [dict JSONFragment];//组合成的

dictString==={"content":"Sadgfdfg","phoneno":"","email":"1049055935@qq.com"}=== 

// 十六进制转换为普通字符串的。

+ (NSString *)stringFromHexString:(NSString *)hexString { // 

char *myBuffer = (char *)malloc((int)[hexString length] /  + );

bzero(myBuffer, [hexString length] /  + );

for (int i = ; i < [hexString length] - ; i += ) {

unsigned int anInt;

NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, )];

NSScanner * scanner = [[[NSScanner alloc] initWithString:hexCharStr] autorelease];

[scanner scanHexInt:&anInt];

myBuffer[i / ] = (char)anInt;

}

NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:];

NSLog(@"------字符串=======%@",unicodeString);

return unicodeString; 

} 

//普通字符串转换为十六进制的。 

+ (NSString *)hexStringFromString:(NSString *)string{

NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];

Byte *bytes = (Byte *)[myD bytes];

//下面是Byte 转换为16进制。

NSString *hexStr=@"";

for(int i=;i<[myD length];i++) 

{

NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数 

if([newHexStr length]==) 

hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr]; 

else 

hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];

}

return hexStr;

}

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