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strlen 函数
运行时函数，获取宽字符编码字符串长度。宽字符也称UNICODE字符、WideChar字符。
注意：在VC中如果需要获取宽字符wchar_t字符串长度，应使用 wcslen 。
函数原型：
size_t strlen (
char * string );
参数
string
类型：char *
以空字符结尾的字符串。
返回值
类型：size_t
获取字符串长度(不包括结尾的空字符)。
支持
| 头文件 | string.h |
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