动态增加按钮

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CObject
--CCmdTarget
--CWnd
---CButton

private:
CButton m_btn;

m_btn.Create("dddd",BS_DEFPUSHBUTTON | WS_VISIBLE | WS_CHILD,CRect(0,0,100,100),this,43434);
//这里最初的代码,当再次点击动态生成按钮时会出错,回为m_btn.Create创建了一个窗口,将按钮窗口与对象窗口关连在一起.当再次点击时重复创建.
解决1:
static BOOL bIsCreate=FALSE;//为静态变量或为成员变量.
if(bIsCreate==FALSE)
{
  m_btn.Create("dddd",BS_DEFPUSHBUTTON | WS_VISIBLE | WS_CHILD,CRect(0,0,100,100),this,43434);
  bIsCreate=TRUE;
}
else
{
  m_btn.DestroyWindow();
  bIsCreate=FALSE;
}
解决2:
if(!m_btn.m_hWnd)
/**
CWnd::m_hWnd
Remarks
The handle of the Windows window attached to this CWnd. The m_hWnd data member is a public variable of type HWND.
*/
{
  m_btn.Create("dddd",BS_DEFPUSHBUTTON | WS_VISIBLE | WS_CHILD,CRect(0,0,100,100),this,43434);
}
else
{
  m_btn.DestroyWindow();
}