十六进制转换为普通字符串的。

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

 { // 

 
char *myBuffer = (char *)malloc((int)[hexString length] / 2 + 1); 
bzero(myBuffer, [hexString length] / 2 + 1); 
for (int i = 0; i < [hexString length] - 1; i += 2) { 
unsigned int anInt; 
NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)]; 
NSScanner * scanner = [[[NSScanner alloc] initWithString:hexCharStr] autorelease]; 
[scanner scanHexInt:&anInt]; 
myBuffer[i / 2] = (char)anInt; 
} 
NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4]; 
NSLog(@"------字符串=======%@",unicodeString); 
return unicodeString; 
 
 
}