简单调用自己写的COM组件

 1 #include "../Simple2/Simple2_i.h"
 2 #include "../Simple2/Simple2_i.c"
 3 
 4 int _tmain(int argc, _TCHAR* argv[])
 5 {
 6     CoInitialize(NULL);
 7 
 8     IUnknown *pUnk;
 9     IFunc *pFunc;
10     HRESULT hr;
11 
12     try
13     {
14         //============================================
15         // get the interface of IFunc
16         hr = CoCreateInstance(CLSID_Func, NULL, CLSCTX_INPROC_SERVER, IID_IFunc, (LPVOID*)&pUnk);
17         if (FAILED(hr))
18         {
19             throw("COM object is not registered.\n");
20         }
21         hr = pUnk->QueryInterface(IID_IFunc, (LPVOID*)&pFunc);
22         if (FAILED(hr))
23         {
24             throw("No IID_IFunc interface.\n");
25         }
26         //============================================
27         // begin to invoke the com object.
28         int ret;
29     
30         // invoke Add method
31         hr = pFunc->Add(1, 2, &ret);
32         if (FAILED(hr))
33         {
34             throw("Invoke Add method failed!\n");
35         }
36         printf("the return value of Add is:%d\n", ret);
37         
38         // invoke subtract method
39         BSTR s1 = SysAllocString(L"hello");
40         BSTR s2 = SysAllocString(L" world");
41         BSTR s3;
42         hr = pFunc->Cat(s1, s2, &s3);
43 
44         if (FAILED(hr))
45         {
46             throw("Invoke Cat method failed!\n");
47         }
48         char *ansiRet;
49         USES_CONVERSION;
50         ansiRet = W2A(s3);
51         printf("the return value of Cat is :%s\n", ansiRet);
52 
53         // s3 should be released now
54         SysFreeString(s3);
55 
56         // don't forget to release the object.
57         pFunc->Release();
58         pUnk->Release();
59     }
60     catch (LPCSTR str)
61     {
62         printf("%s", str);
63     }
64     
65 
66     CoUninitialize();
67     return 0;
68 }