SetWindowLong出现的问题

Question

各位大侠。我在MFC 框架类中加Button事件，想实现View窗口透明，结果整个框架窗口全部透明了，改怎么改啊？、谢谢！着急！！
void CMainFrame::onbutton1:

SetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE, 
GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE) | 0x80000); 


HINSTANCE hInst=LoadLibrary("User32.DLL"); 
if(hInst) 
    { 
        typedef BOOL     (WINAPI * MYFUNC)(HWND,COLORREF,BYTE,DWORD); 
        MYFUNC fun=NULL; 


        fun=(MYFUNC)GetProcAddress(hInst,"SetLayeredWindowAttributes"); 
        if(fun) 
            fun(this->GetSafeHwnd(),0,70,2); 
        FreeLibrary(hInst); 
    }

Answer 1

fun(this->GetSafeHwnd(),0,70,2);
修改成
｛
pWnd=((CFrameWnd*)(AfxGetApp()->m_pMainWnd))->GetActiveView();
fun(pWnd>GetSafeHwnd(),0,70,2);
｝