MFC CComboBox CProgressCtrl控件操作
CComboBox 下拉条
CComboBox::ResetContent()删除所有文本
CComboBox::AddString()增加一行
CString szTmp;
CComboBox::GetWindowText(szTmp);取得当前文本
CProgressCtrl 进度条
CProgressCtrl::SetRange(0,1000);设置范围
CProgressCtrl::SetStep(设置当前步长);
CProgressCtrl::SetPos()设置当前进度
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