ActiveX client with MFC ClassWizard or #import

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问题：
Are there two ways of creating an AutoCAD ActiveX client using C++?


解答：
There are two ways of creating an AutoCAD Active X client using C++.

Method #1
Use MFC ClassWizard to import the interfaces (from acad.tlb) that you need for
your client application.

Method #2
Use #import with acad.tlb.

NOTE:  Although #import is something new from VC++ 5.0, it previously existed in
ClassWizard.

The following code segments demonstrate both methods, and is to be used with a
MFC ClassWizard-generated IAcadApplication interface.
// This is declared as a member variable in the CSampActiveXClientDlg.
// Given that you've use ClassWizard to import IAcadApplication interface
// from acad.tlb.

1. IAcadApplication m_IApp;
   
2. 
   
3. 
   
4. void CSampActiveXClientDlg::OnStartacad()
   
5. {
   
6. // TODO: Add your control notification handler code here
   
7. HRESULT hr = NOERROR;
   
8. CLSID clsid;
   
9. LPUNKNOWN pUnk = NULL;
   
10. LPDISPATCH pDisp = NULL;
    
11. 
    
12. BeginWaitCursor();
    
13. CoInitialize(NULL);
    
14. hr = ::CLSIDFromProgID(L"AutoCAD.Application", &clsid);
    
15. 
    
16. if (SUCCEEDED(hr))
    
17. {
    
18. if(::GetActiveObject(clsid, NULL, &pUnk) == S_OK)
    
19. {
    
20.   VERIFY(pUnk->QueryInterface(IID_IDispatch, (LPVOID*) &pDisp) == S_OK);
    
21.   m_IApp.AttachDispatch(pDisp);
    
22.   pUnk->Release();
    
23. }
    
24. else
    
25.   VERIFY(m_IApp.CreateDispatch(clsid) == TRUE);
    
26. 
    
27. m_IApp.SetVisible(TRUE);
    
28. 
    
29. }
    
30. else
    
31. AfxMessageBox("Acad.Application is not registered!");
    
32. 
    
33. EndWaitCursor();
    
34. }
    

IAcadApplication m_IApp;<br /> <br /> <br /> void CSampActiveXClientDlg::OnStartacad()<br /> {<br /> // TODO: Add your control notification handler code here<br /> HRESULT hr = NOERROR;<br /> CLSID clsid;<br /> LPUNKNOWN pUnk = NULL;<br /> LPDISPATCH pDisp = NULL;<br /> <br /> BeginWaitCursor();<br /> CoInitialize(NULL);<br /> hr = ::CLSIDFromProgID(L"AutoCAD.Application", &clsid);<br /> <br /> if (SUCCEEDED(hr))<br /> {<br /> if(::GetActiveObject(clsid, NULL, &pUnk) == S_OK)<br /> {<br />   VERIFY(pUnk->QueryInterface(IID_IDispatch, (LPVOID*) &pDisp) == S_OK);<br />   m_IApp.AttachDispatch(pDisp);<br />   pUnk->Release();<br /> }<br /> else<br />   VERIFY(m_IApp.CreateDispatch(clsid) == TRUE);<br /> <br /> m_IApp.SetVisible(TRUE);<br /> <br /> }<br /> else<br /> AfxMessageBox("Acad.Application is not registered!");<br /> <br /> EndWaitCursor(); <br /> }<br />

This code snippet is to be used with #import.
// your location of acad.tlb may vary
#import "c:\acad2k\acad.tlb" raw_interfaces_only, raw_native_types,
no_namespace, named_guids  

1. CComQIPtr<IAcadApplication, &IID_IAcadApplication> gpApp;
   
2. 
   
3. // start Acad
   
4. HRESULT InitAcad()
   
5. {
   
6. HRESULT hr = S_OK;
   
7. CLSID clsid;
   
8. // get acad running first
   
9. hr = CLSIDFromProgID(L"AutoCAD.Application", &clsid);
   
10. if(FAILED(hr))
    
11. return hr;
    
12. CComPtr<IUnknown> pIUnk;
    
13. hr = GetActiveObject(clsid, NULL, pIUnk);
    
14. if(!pIUnk)
    
15. {
    
16.   hr = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER,
    
17.   IID_IAcadApplication, (void**)&gpApp);
    
18. }
    
19. else
    
20.   gpApp = pIUnk;
    
21. if(FAILED(hr) || !gpApp)
    
22. return hr;
    
23. gpApp->put_Visible(VARIANT_TRUE);
    
24. 
    
25. return hr;
    
26. }
    

CComQIPtr<IAcadApplication, &IID_IAcadApplication> gpApp;<br /> <br /> // start Acad<br /> HRESULT InitAcad()<br /> {<br /> HRESULT hr = S_OK;<br /> CLSID clsid;<br /> // get acad running first<br /> hr = CLSIDFromProgID(L"AutoCAD.Application", &clsid);<br /> if(FAILED(hr))<br /> return hr;<br /> CComPtr<IUnknown> pIUnk;<br /> hr = GetActiveObject(clsid, NULL, pIUnk);<br /> if(!pIUnk)<br /> {<br />   hr = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER,<br />   IID_IAcadApplication, (void**)&gpApp);<br /> }<br /> else<br />   gpApp = pIUnk;<br /> if(FAILED(hr) || !gpApp)<br /> return hr;<br /> gpApp->put_Visible(VARIANT_TRUE);<br /> <br /> return hr;<br /> }<br />

/db_自贡黄明儒_

N版，改成C十十了？