PostMessage from a DLL

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Hi,
I'm trying to write a DLL that have to manage serial comunication and
send results to another application.
Basically the DLL read data from serial port and when recognize a full
frame it compute some values from the read stream and send it to the
application.
All works fine when I put the read/send stuff in a class
"CComunication" that belongs to the project. When I make a DLL with
this class I got errors. I have tryed with MFC Extension and also
Regular DLL but the application still crash.
If I comment the post message istruction the programs doesn't crash.

pFrame = new CFrame;
::PostMessage(m_pWnd->m_hWnd, m_iMessage, (WPARAM) (pFrame), 0);

where m_pWnd is initialized in the exe dialog with values "this" and
m_iMessage is set to WM_APP+1.

I have tryed also with Postmessage
::PostMessage(m_pWnd->m_hWnd, m_iMessage,0, 0);

without results.

What can I do ?

Thanks in Advance

.

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