VB 动态调用未注册DLL

Private Declare Function FreeLibrary Lib "kernel32" ( ByVal hLibModule As Long ) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" ( ByVal lpLibFileName As String ) As Long
Private Declare Function GetProcAddress Lib "kernel32" ( ByVal hModule As Long , ByVal lpProcName As String ) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" ( ByVal lpPrevWndFunc As Long , ByVal hWnd As Long , ByVal Msg As Any, ByVal wParam As Any, ByVal lParam As Any) As Long

Private Sub Command1_Click()
On Error Resume Next
Dim lb As Long , pa As Long
'以 text.dll 为例,设 text.dll 功能跟 user32.dll 完全相同。
lb = LoadLibrary(App.Path & "\text.dll" )
'取得 text.dll 中 SetWindowTextA 函数的地址
pa = GetProcAddress(lb, "ExploreMap" )
'调用 SetWindowTextA 函数过程
pa = CallWindowProc(pa, ByVal 0 &, ByVal 0 &, ByVal 0 &, ByVal 0 &)
'释放...
FreeLibrary lb
Me.Caption = pa
End Sub