BOOL CWnd::SubclassWindow(HWND hWnd)
{
if (!Attach(hWnd))
return FALSE;
// allow any other subclassing to occur
PreSubclassWindow();
// now hook into the AFX WndProc
WNDPROC* lplpfn = GetSuperWndProcAddr();
WNDPROC oldWndProc = (WNDPROC)::SetWindowLong(hWnd, GWL_WNDPROC,
(DWORD)AfxGetAfxWndProc());
ASSERT(oldWndProc != (WNDPROC)AfxGetAfxWndProc);
if (*lplpfn == NULL)
*lplpfn = oldWndProc; // the first control of that type created
#ifdef _DEBUG
else if (*lplpfn != oldWndProc)
{
TRACE0("Error: Trying to use SubclassWindow with incorrect CWnd\n");
TRACE0("\tderived class.\n");
TRACE3("\thWnd = $%04X (nIDC=$%04X) is not a %hs.\n", (UINT)hWnd,
_AfxGetDlgCtrlID(hWnd), GetRuntimeClass()->m_lpszClassName);
ASSERT(FALSE);
// undo the subclassing if continuing after assert
::SetWindowLong(hWnd, GWL_WNDPROC, (DWORD)oldWndProc);
}
#endif
return TRUE;
}
/**
* ウィンドウを動的サブクラス化し、CWnd オブジェクトに結び付けるためにこのメンバー関数を呼び出します
* @param[in] hWnd ウィンドウ ハンドル
* @retval TRUE 成功
* @retval FALSE 失敗
*/
BOOL CWndProc::SubclassWindow(HWND hWnd)
{
if (!Attach(hWnd))
{
return FALSE;
}
PreSubclassWindow();
WNDPROC newWndProc = &CWndProc::WndProc;
WNDPROC oldWndProc = reinterpret_cast<WNDPROC>(::SetWindowLongPtr(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(newWndProc)));
if ((m_pfnSuper == NULL) && (oldWndProc != newWndProc))
{
m_pfnSuper = oldWndProc;
}
return TRUE;
}
void CSubclassWnd::Subclass(HWND hWnd)
{
ASSERT(hWnd); // Do you really want to subclass a window that has a NULL handle?
ASSERT(!m_bIsSubclassed);
ASSERT(m_hWnd == NULL);
m_hWnd = hWnd;
m_hWndAfter = hWnd;
// Store address of the original window procedure
m_oldWndProc = (WNDPROC)GetWindowLongPtr(m_hWnd, GWLP_WNDPROC);
ASSERT(m_oldWndProc != SubclassWndProc);
PreSubclassWindow();
// And set the new one
m_oldWndProc = (WNDPROC)(::LONG_PTR)SetWindowLongPtr(m_hWnd,GWLP_WNDPROC,(LONG)(::LONG_PTR)SubclassWndProc);
CEventLock lock(CSubclassWnd::m_CS);
CSubclassWnd::m_SubclassWndMap[m_hWnd] = this;
m_bIsSubclassed = true;
}
