IsPrintable , which returns TRUE if the given string contains no unprintable characters and returns FALSE if the given string does contain printable characters.
isPrintable，在给定字符串不包含不可打印字符时返回TRUE，而在给定字符串确实包含不可打印字符时返回FALSE。
Line 4 encodes the string Double secret probation and USES Base64 to turn the encrypted string into printable characters that can easily be transmitted over E-mail, say.
行4编码字符串Doublesecretprobation并使用Base64将加密了的这个字符串转变为可打印的字符，以便于用电子邮件等程序传输。
Returns a C-style character string that is a printable version of the type name. Type names are generated in a system-dependent way.
返回c风格字符串，这是类型名字的可显示版本。类型名字用系统相关的方法产生。
Returns a C-style character string that is a printable version of the type name. Type names are generated in a system-dependent way.
返回c风格字符串，这是类型名字的可显示版本。类型名字用系统相关的方法产生。
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