Visual Basic - Cách gọi hàm API

Hướng dẫn :
- để gọi các hàm trong API  ta dùng phương thức sau

• Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, ByVal lParam As String) As Int32
•     Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hWnd As IntPtr, ByVal lpClassName As System.Text.StringBuilder, ByVal nMaxCount As Integer) As Integer
•     Declare Function EnumChildWindows Lib "user32.dll" Alias "EnumChildWindows" (ByVal WindowHandle As IntPtr, ByVal Callback As EnumWindowProcess, ByVal lParam As IntPtr) As Boolean

- Cú pháp sẽ là : Declare Function + Tên Func + Lib + "Tên tệp DLL" + Alias + "Giá trị" + Cấu trúc