PB切换输入法，在xp下可以，win7下不行，各位大神怎么解决

//定义函数
function boolean ImmSimulateHotKey (ULong hWnd, ULong dwHotKeyID) library "IMM32.dll"
function ulong GetKeyboardLayout(ulong dwLayout) LIBRARY "user32.dll"
function boolean ImmIsIME(uLong hklKeyboardLayout) library "IMM32.DLL"

//切换到中文输入法
ulong hklCurrent
ulong hnd

hklCurrent=GetKeyboardLayout(0)
if not ImmIsIME(hklCurrent) then
hnd=Handle(parent)
ImmSimulateHotKey(hnd,16)
end if