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POHow to retrieve the Interface ID of a COM class so that it can be passed to CoCreateInstance?
 

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  1. POHow to retrieve the Interface ID of a COM class so that it can be passed to CoCreateInstance?
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    <p>I want to programaticly retrieve the Interface ID for any class so that I can pass it to CoCreateInstance. Any help is very much appreciated!!</p> <p><B>See "How Do I Get This" below:</B></p> <pre><code>HRESULT hResult; CLSID ClassID; void *pInterface; if(!(hResult = SUCCEEDED(CoInitialize(NULL)))) { return 1; } if(S_OK == CLSIDFromProgID(OLESTR("Scripting.FileSystemObject"), &amp;ClassID)) { hResult = CoCreateInstance(ClassID, NULL, CLSCTX_INPROC_SERVER, &lt;&lt;How Do I Get This?&gt;&gt;, (LPVOID *)&amp;pInterface); } CoUninitialize(); </code></pre> <p><b>EDIT: Thanks for all of the help, seems to work perfectly now! :</b></p> <pre><code>HRESULT hResult; CLSID ClassID; IClassFactory *pClf; void *pVdb; if(!(hResult = SUCCEEDED(CoInitialize(NULL)))) { return 1; } if(SUCCEEDED(CLSIDFromProgID(OLESTR("Scripting.FileSystemObject"), &amp;ClassID)) { IDispatch *pDispatch; if(SUCCEEDED(CoCreateInstance(ClassID, NULL, CLSCTX_INPROC_SERVER, IID_IDispatch, (void **)&amp;pDispatch)) { OLECHAR *sMember = L"FileExists"; DISPID idFileExists; if(SUCCEEDED(pDispatch-&gt;GetIDsOfNames( IID_NULL, &amp;sMember, 1, LOCALE_SYSTEM_DEFAULT, &amp;idFileExists)) { unsigned int puArgErr = 0; VARIANT VarResult; EXCEPINFO pExcepInfo; VariantInit(&amp;VarResult); VariantInit(&amp;pExcepInfo); DISPPARAMS pParams; memset(&amp;pParams, 0, sizeof(DISPPARAMS)); pParams.cArgs = 1; VARIANT Arguments[1]; VariantInit(&amp;Arguments[0]); pParams.rgvarg = Arguments; pParams.cNamedArgs = 0; pParams.rgvarg[0].vt = VT_BSTR; pParams.rgvarg[0].bstrVal = SysAllocString(L"C:\\Test.txt"); hResult = pDispatch-&gt;Invoke( idFileExists, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, &amp;pParams, &amp;VarResult, &amp;pExcepInfo, &amp;puArgErr ); SysFreeString(pParams.rgvarg[0].bstrVal); printf("File Exists? %d\n", abs(VarResult.boolVal)); } pDispatch-&gt;Release(); } } CoUninitialize(); </code></pre>
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    1. COYea, Its hard to get votes on the "old-school" stuff anymore. But atleast this is here for the next guy to review! :D
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