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std::ungetwc

STD：：ungetwc

Defined in header ​​
wint_t ungetwc( wint_t ch, std::FILE* stream ​​

如果ch不等于WEOF，推宽性格ch到与流关联的输入缓冲区中。stream以比后续读取操作更好的方式从stream就能找回那个宽广的性格。与流关联的外部设备不被修改。

流重定位操作std::fseek，，，std::fsetpos，和std::rewind抛弃…的影响ungetwc...

如果ungetwc在没有中间读取或重新定位的情况下多次调用，它可能会失败%28，换句话说，可以保证一个大小为1的后推缓冲区，但是任何较大的缓冲区都是实现定义的%29。如果多次成功ungetwc执行时，读取操作将以反向顺序检索被推回的宽字符。ungetwc...

如果ch等号WEOF，操作失败，流不受影响。

一次成功的呼叫ungetwc清除文件状态结束标志。feof...

一次成功的呼叫ungetwc在流%28上，无论是文本还是二进制文件，%29都以未指定的方式修改流位置指示符，但确保在通过读取操作检索所有回推宽字符之后，流位置指示符与其之前的值相等。ungetwc...

参数

ch-wide character to be put back
stream-file stream to put the wide character back to

返回值

论成功ch会被归还。

论失败WEOF返回，并且给定的流保持不变。

另见

ungetcputs a character back into a file stream (function)
fgetwcgetwcgets a wide character from a file stream (function)

c联合国系统的文件c

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

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