如Beep的API声明为
Public Declare Function Beep Lib “kernel32″ Alias “Beep” (ByVal dwFreq As Long, ByVal dwDuration As Long) As Long
则使用方法如下
‘创建对象
Set Wrap = CreateObject("DynamicWrapper")
‘注册API
Wrap.Register "KERNEL32.DLL", "Beep", "i=ll", "f=s", "r=l"
‘调用API
Wrap.Beep(500, 100)
其中注册API中， “i=ll”是API的参数类型, “f=s”是调用方式, “r=l”是返回类型
这些可以参考下面的说明。
REM i: (Argument Type) REM ‘a‘, sizeof(IDispatch*), VT_DISPATCH} // a IDispatch* REM ‘c‘, sizeof(unsigned char), VT_I4} // c signed char REM ‘d‘, sizeof(double), VT_R8} // d 8 byte real REM ‘f‘, sizeof(float), VT_R4} // f 4 byte real REM ‘k‘, sizeof(IUnknown*), VT_UNKNOWN} // k IUnknown* REM ‘h‘, sizeof(long), VT_I4} // h HANDLE REM ‘l‘, sizeof(long), VT_I4} // l long REM ‘p‘, sizeof(void*), VT_PTR} // p pointer REM ‘s‘, sizeof(BSTR), VT_LPSTR} // s string REM ‘t‘, sizeof(short), VT_I2} // t short REM ‘u‘, sizeof(UINT), VT_UINT} // u unsigned int REM ‘w‘, sizeof(BSTR), VT_LPWSTR} // w wide string REM f: (Call Method) REM ‘m‘ - DC_MICROSOFT 0x0000, Default REM ‘b‘ - DC_BORLAND 0x0001, Borland compat REM ‘s‘ - DC_CALL_STD 0x0020, __stdcall REM ‘c‘ - DC_CALL_CDECL 0x0010, __cdecl REM ‘4‘ - DC_RETVAL_MATH4 0x0100, Return value in ST REM ‘8‘ - DC_RETVAL_MATH8 0x0200, Return value in ST REM r: (Return Type) REM Same as i
示例：
‘用机箱内的蜂鸣器播放音乐
Sub BeepMusic()
Set Wrap = CreateObject("DynamicWrapper")
Wrap.Register "KERNEL32.DLL", "Beep", "i=ll", "f=s", "r=l"
res = Wrap.Beep(500, 100)
res = Wrap.Beep(550, 100)
res = Wrap.Beep(600, 100)
res = Wrap.Beep(650, 100)
res = Wrap.Beep(700, 700)
WScript.Sleep 200
res = Wrap.Beep(700, 100)
res = Wrap.Beep(650, 100)
res = Wrap.Beep(600, 100)
res = Wrap.Beep(550, 100)
res = Wrap.Beep(500, 700)
End Sub
BeepMusic
‘取前景窗体标题
Sub GetForeWindowCaption()
Const WM_GETTEXT = &HD
Set Wrap = CreateObject("DynamicWrapper")
Wrap.Register "USER32.DLL", "GetForegroundWindow", "f=s", "r=l"
Wrap.Register "USER32.DLL", "SendMessage", "i=lllr", "f=s", "r=l"
Title = Space(100)
res = Wrap.SendMessage(Wrap.GetForegroundWindow(), WM_GETTEXT , 100, Title)
GetForeWindowCaption = Title
End Sub
MsgBox GetForeWindowCaption
‘发送键盘消息，显示桌面
Sub ShowDesktop()
Const VK_LWIN = &H5B
Const VK_D = &H44
Public Const KEYEVENTF_KEYUP = &H2
Set Wrap = CreateObject("DynamicWrapper")
Wrap.Register "USER32.DLL", "keybd_event", "i=ccll", "f=s"
Wrap.keybd_event VK_LWIN, 0, 0, 0
Wrap.keybd_event VK_D, 0, 0, 0
Wrap.keybd_event VK_D, 0, KEYEVENTF_KEYUP, 0
Wrap.keybd_event VK_LWIN, 0, KEYEVENTF_KEYUP, 0
End Sub
ShowDesktop