Displaying Dialog from Dll

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3.00/5 (2 votes)

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I have got dll staticly linked to mfc.
In the dll is dialog class located.
I call exported function from main program.

void __stdcall ShowMMInfo(DWORD id, HWND parent)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
	CMainDialog dlg(CWnd::FromHandle(parent));
	dlg.DoModal();
}

In DoModal occures an unhandled exception in the line

if (CreateDlgIndirect(lpDialogTemplate,
                CWnd::FromHandle(hWndParent), hInst))

What can be wrong?

Update:
I have replaced Skin Controls from our library with mfc controls. After that program begun work well.
But i need Skin controls in that dialog.

In main program skin controls work well.
What should i do to make skin controls to load well?
I just added lib file to link and include header files.
I took a look with hdependency walker: there are skin controls classes.

But when i replace for example CDialog with CSCScaleDialog i got an exception.

I tryed to link staticly and dinamicly to main program, but there is no difference.

Posted 29-Mar-11 22:01pm

Kozlov_Sergey

Updated 30-Mar-11 2:35am

v2

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Comments

Richard MacCutchan 30-Mar-11 4:12am

Check what the exception is, that may give you a clue.

[no name] 30-Mar-11 4:17am

Access violation.

[no name] 31-Mar-11 7:16am

I resolved problem moving files from dll project to exe project.

2 solutions

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Graham Shanks · Answer 1 · 2011-03-29T22:29:00

It could be the hInst. We have had problems with this and include the following code:

class CMyApp : public CWinApp
{
public:
  CMyApp();
  ~CMyApp();

// Overrides
public:
  virtual BOOL InitInstance();
  virtual int ExitInstance();

  static HINSTANCE GetInstance();

  DECLARE_MESSAGE_MAP()
};

// In the body

HINSTANCE hMyInst = 0;

// The one and only CMyApp object
CMyApp theApp;

BOOL CMyApp::InitInstance()
{
  CWinApp::InitInstance();
  hMyInst = AfxGetInstanceHandle();

  return TRUE;
}

int CMyApp::ExitInstance()
{
  return CWinApp::ExitInstance();
}

HINSTANCE CMyApp::GetInstance()
{
  return hMyInst;
}

The your code becomes:

if (CreateDlgIndirect(lpDialogTemplate,
             CWnd::FromHandle(hWndParent), CMyApp::GetInstance()))

Nitheesh George · Answer 2 · 2011-03-29T22:54:00

Solution 2

Hi,

Make sure that the Dialog resource is in your dll project. AFX_MANAGE_STATE(AfxGetStaticModuleState()); sets the current resoure handle as that of dll. So if the specified dialog resource is not found in dll CreateDlgIndirect will fail.

hope this helps

Posted 29-Mar-11 22:54pm

Nitheesh George

Comments

[no name] 30-Mar-11 5:00am

Thank you. I decided to recreate dialog class and all functionality as if i just begin to make dialogs. Simple not skined dialog works well.