CFileDialog could not work when open from DLL

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C++

MFC

VisualC++

Hi,

I've generated a DLL from a MFC dialog-based project and loaded this DLL onto another MFC dialog-based project.

it can load the dialog from the DLL. But when i need to open a new file from the dialog, the program will just hang there. I am using a File Dialog and a worker thread to run the function of the open button.

In the button:

// Delete previous items
this->UpdateData();
RunThread();
this->UpdateData(FALSE);

In the worker thread:

CFileDialog FileDlg(TRUE, ".txt", NULL, OFN_NOCHANGEDIR, strFilter);

if( FileDlg.DoModal() == IDOK )
{	
    // Open the file
}

HINSTANCE m_hViewDll;

// In 2nd Project.cpp (OnClickedCreateData)

typedef CRuntimeClass * (*GETDLLVIEW)();

AfxEnableControlContainer();

m_hViewDll = AfxLoadLibrary(".\\ProjectA.dll");
if (!m_hViewDll)
{
      AfxMessageBox("Error: Cannot find component \"ProjectA.dll\"");
      return FALSE;
}

GETDLLVIEW GetView = (GETDLLVIEW) GetProcAddress(m_hViewDll,
       "RunMainframe");
ASSERT (GetView != NULL);

// In Exit Button

if (m_hViewDll)
{
    AfxFreeLibrary(m_hViewDll);
    m_hViewDll = NULL;
}

// In ProjectA.h

class __declspec( dllexport ) CProjectAApp;
extern "C" __declspec( dllexport ) CProjectAApp* RunMainframe();
class __declspec( dllexport ) CProjectADlg;

// In ProjectA.cpp

CProjectAApp* RunMainframe()
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState()) ;
	CProjectAApp* myapp=new CProjectAApp();
	myapp->InitInstance();
	myapp->Run();
	return myapp;
}

How can i solve this problem? and it would be great if someone can explain to me why this happpen so that I can learn from it.

Thank you for helping.