linux errno error Well 84

Invalid or incomplete multibyte or wide character

This is what this means , previously used properly , increasing the length of the string to be transferred is the case after
iconv function utf8 turn GB2312

is not where the problem ?
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try to GB2312 GB18030
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http :/ / baike.baidu.com/view/1437030.htm
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10 characters or less no problem, more than 11 characters on the conversion failed. What problem Oh
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MB to find the reason .
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whatever reason, talk ah