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embed an MFC dialog-based app in a DLL and run using RunDll32

/ Published in: C++
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This approach allows an application to be embedded in a DLL. This is handy for diagnostic/maintenance utilities that are used with the DLL.

Steps to create:
* Create a MFC DLL project
* Add a dialog
* Add an entry point function such as void CALLBACK AppInDll_Entry(HWND hwnd, HINSTANCE hinst, LPCSTR lpCmdLine, int nCmdShow)
* In this new function, do this:
CDlgInDll dlg;
theApp.m_pMainWnd = &dlg;
INT_PTR nResponse = dlg.DoModal();
* in CAppInDllApp::InitInstance(), do this
INITCOMMONCONTROLSEX InitCtrls;
InitCtrls.dwSize = sizeof(InitCtrls);
InitCtrls.dwICC = ICC_WIN95_CLASSES;
InitCommonControlsEx(&InitCtrls);

SetRegistryKey(_T("Local AppWizard-Generated Applications"));

CWinApp::InitInstance();
* Launch the 'app' using runDll32, for example:
rundll32 AppInDll.dll AppInDll_Entry a b c
or
ShellExecute( NULL, "open", "c:\\windows\\system32\\rundll32.exe", "AppInDll.dll AppInDll_Entry a b c", NULL, SW_SHOWNORMAL) ;

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  1. BOOL CAppInDllApp::InitInstance()
  2. {
  3. 	// InitCommonControlsEx() is required on Windows XP if an application
  4. 	// manifest specifies use of ComCtl32.dll version 6 or later to enable
  5. 	// visual styles.  Otherwise, any window creation will fail.
  6. 	INITCOMMONCONTROLSEX InitCtrls;
  7. 	InitCtrls.dwSize = sizeof(InitCtrls);
  8. 	// Set this to include all the common control classes you want to use
  9. 	// in your application.
  10. 	InitCtrls.dwICC = ICC_WIN95_CLASSES;
  11. 	InitCommonControlsEx(&InitCtrls);
  12.  
  13. 	// Standard initialization
  14. 	// If you are not using these features and wish to reduce the size
  15. 	// of your final executable, you should remove from the following
  16. 	// the specific initialization routines you do not need
  17. 	// Change the registry key under which our settings are stored
  18. 	// TODO: You should modify this string to be something appropriate
  19. 	// such as the name of your company or organization
  20. 	SetRegistryKey(_T("Local AppWizard-Generated Applications"));
  21.  
  22.    CWinApp::InitInstance();
  23.  
  24. 	return TRUE;
  25. }
  26.  
  27. void CALLBACK AppInDll_Entry(HWND hwnd, HINSTANCE hinst, LPCSTR lpCmdLine, int nCmdShow)
  28. {
  29.    AFX_MANAGE_STATE(AfxGetStaticModuleState());
  30.  
  31. 	// Standard initialization
  32. 	// If you are not using these features and wish to reduce the size
  33. 	// of your final executable, you should remove from the following
  34. 	// the specific initialization routines you do not need
  35. 	// Change the registry key under which our settings are stored
  36. 	// TODO: You should modify this string to be something appropriate
  37. 	// such as the name of your company or organization
  38. 	/// SetRegistryKey(_T("Local AppWizard-Generated Applications"));
  39.  
  40. 	CDlgInDll dlg;
  41.    theApp.m_pMainWnd = &dlg;
  42. 	INT_PTR nResponse = dlg.DoModal();
  43. 	if (nResponse == IDCANCEL)
  44. 	{
  45. 		// TODO: Place code here to handle when the dialog is
  46. 		//  dismissed with Cancel
  47. 	}
  48.  
  49. }

URL: http://www.codeproject.com/KB/DLL/eventrecorder.aspx

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