&引用；“用户定义类型未定义”；VB6 API声明中的编译错误

为什么在尝试编译以下API声明时会出现“用户定义类型未定义”错误

Public Declare Function RegQueryInfoKey Lib "advapi32.dll" Alias _
  "RegQueryInfoKeyA" (ByVal hKey As Long, ByVal lpClass As String, _
  ByRef lpcbClass As Long, ByRef lpReserved As Long, ByRef lpcSubKeys As Long, _
  ByRef lpcbMaxSubKeyLen As Long, ByRef lpcbMaxClassLen As Long, _
  ByRef lpcValues As Long, ByRef lpcbMaxValueNameLen As Long, _
  ByRef lpcbMaxValueLen As Long, ByRef lpcbSecurityDescriptor As Long, _
  ByRef lpftLastWriteTime As FILETIME) As Long

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看起来您尚未声明

FILETIME

UDT

在VB6中，声明为：

Type FILETIME
  dwLowDateTime As Long
  dwHighDateTime As Long
End Type

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谢谢你添加这一点，但是如果人们不能使用API查看器来查找简单的东西，那么他们就没有希望了。我想很明显，OP不知道如何使用API查看器。因此，Deanna的补充既有用又有根据。