PC程序改变窗口透明度

//加入WS_EX_LAYERED扩展属性
SetWindowLong(GetSafeHwnd(),GWL_EXSTYLE,GetWindowLong(GetSafeHwnd(),GWL_EXSTYLE)^0x80000);

HINSTANCE hInst = LoadLibrary("User32.DLL");  
if(hInst)  
{  
typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD);  
MYFUNC fun = NULL;  
//取SetLayeredWindowAttributes函数指针  
fun = (MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");
if(fun)
fun(GetSafeHwnd(),RED,(255*nTrans)/100,2); //设置窗体透明度60%

FreeLibrary(hInst);  
}