>>598
処理が単純で速いほうか、なるほど茨の道を選ぶのだな。
答えはは既におまえが手にしたC++のソースの中にある。

まずはこれから始めようか。
Public Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (
ByVal dwExStyle As Long,
ByVal lpClassName As String,
ByVal lpWindowName As String,
ByVal dwStyle As Long,
ByVal x As Long,
ByVal y As Long,
ByVal nWidth As Long,
ByVal nHeight As Long,
ByVal hWndParent As Long,
ByVal hMenu As Long,
ByVal hInstance As Long,
lpParam As Long) As Long