jaydenjaymes在线视频:visual basic

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Private Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpbuffer As String, nSize As Long) As Long
这段代码是什么意思呢?

声明一个API函数,函数名为GetUserName,该函数在advapi32.dll中有定义,有两个参数(lpbuffer和nSize)返回类型为Long