NSString *s1 = @"10"; unsigned long l1 = strtoul([s1 cStringUsingEncoding:NSUTF8StringEncoding], NULL, 16); NSLog(@"%ld",l);NSString *s1 = @"10"; unsigned long l1 = str
阅读背景：
Objective-C如何把UTF-8字符串转换为十六进制数
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