C / C++ / MFC

<br />
void<br />
CMyView::drawGraph()<br />
{<br />
/*<br />
virtual BOOL CreateEx(<br />
   DWORD dwExStyle,<br />
   LPCTSTR lpszClassName,<br />
   LPCTSTR lpszWindowName,<br />
   DWORD dwStyle,<br />
   const RECT& rect,<br />
   CWnd* pParentWnd,<br />
   UINT nID,<br />
   LPVOID lpParam = NULL<br />
);<br />
*/<br />
	CRect rect1( 100, 200, 300, 400 );<br />
	CreateEx(  0, NULL, TEXT("Graph"), WS_OVERLAPPEDWINDOW|WS_CHILD,<br />
		rect1, this, 0 );<br />
}<br />
<br />
Unfortunately, the call to CWnd::CreateEx dies with an assertion error. The routine CWnd::CreateEx<br />
calls the routine AfxHookWindowCreate. This routine has the following assert statement in it:<br />
<code><br />
ASSERT(pWnd->m_hWnd == NULL);   // only do once<br />

class CAdodc_my : public Cdialog
class CMyModeless2 : public Cdialog

CMyModeless2* m_pModeless; // into "MyModeless2.h"
CComboBox m_cComboBoxModeless;  // into "MyModeless2.h"

BOOL CAdodc_my::OnInitDialog()
{
m_pModeless = new  CMyModeless2( this); // into constructor Adodc_my.cpp
m_pModeless->m_cComboBoxModeless.AddString("SPARTAC");
}
Debug Assertion Failed!
Program: ...Tested_Examples_Studio_2008\ADOMy_first\Debug\ADOMy_first.exe
File: f:\dd\vctools\vc7libs\ship\atlmfc\include\afxwin2.inl
Line: 879
For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application)