SetButtonInfo 怎么出不来小箭头？

Question

m_bar.Create(m_hWndParent,rect,"w name",WS_CHILD | WS_VISIBLE ,TBSTYLE_EX_DRAWDDARROWS,0,NULL); TBBUTTONINFO tbi;
m_bar.GetButtonInfo(m_bar.CommandToIndex(1112), &tbi);
tbi.fsStyle |= TBSTYLE_DROPDOWN;
m_bar.SetButtonInfo(m_bar.CommandToIndex(1112), &tbi);
1112是按钮的ID

Answer 1

参考:http://www.yesky.com/20011113/204932.shtml

Answer 2

TBBUTTON mbb;
mbb.iBitmap=0;
mbb.fsState=TBSTATE_ENABLED;
mbb.fsStyle=TBSTYLE_BUTTON|TBSTYLE_AUTOSIZE ;
mbb.iString=0;
mbb.idCommand=2300;
this->cToolBar.GetToolBarCtrl().AddButtons(1,&mbb);
TBBUTTONINFO pp1 ;
pp1.cbSize=sizeof(TBBUTTONINFO);
cToolBar.GetToolBarCtrl().GetButtonInfo(2300,&pp1);
pp1.cx=64;
pp1.cchText=3;
pp1.pszText="ol";
cToolBar.GetToolBarCtrl().SetButtonInfo(2300,&pp1);
TBBUTTONINFO pp2;
pp2.cbSize=sizeof(TBBUTTONINFO);
cToolBar.GetToolBarCtrl().GetButtonInfo(2300,&pp2);
AfxMessageBox(pp2.pszText);////////////为什么是空的