Nsstring转换成ascii码问题

[南瓜饼]

比如NSString * str=@"12345678";这个字符串怎么转换成ascii码啊

[ArcRain]

参考https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.htmlGetting C Strings部分。 cStringUsingEncoding:或者UTF8String

[xiaoyaokk]

const char *ascii =[str UTF8String]跟楼上一样

[hslinux]

const char *pAscii = str.UTF8String;