Instantiating COM objects
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Hey guys, I don't know much Windows programming (and my C++ is a little rusty), I'm hoping you all can give me a hand. I'm trying to instantiate an
IShellMenuobject (http://msdn.microsoft.com/en-us/library/bb774901(VS.85).aspx). MSDN says to create an object I need to: "call CoCreateInstance with the rclsid parameter set to CLSID_MenuBand and the riid parameter set to IID_IShellMenu. You must first initialize the interface by calling IShellMenu::Initialize, and then initialize the menu band by calling IShellMenu::SetShellFolder." The first step is easy enough, I'm doing this:IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);But I'm running into trouble when I call
aTest->Initialize(). More specifically, the first parameter needs to a pointer to anIShellMenuCallbackobject and I can't figure out how to instantiate something that implements that interface. Ideally, this is what I'd like to do:class CallbackTestImpl1 : public IShellMenuCallback
{
public:
CallbackTestImpl1() { }
~CallbackTestImpl1() { }// Implement the virtual method HRESULT STDMETHODCALLTYPE IShellMenuCallback::CallbackSM(LPSMDATA psmd, UINT uMsg, WPARAM wParam, LPARAM lParam) { return S\_OK; }};
IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);
IShellMenuCallback *aCallbackTest = new CallbackTestImpl1();
aRes = aTest->Initialize(aCallbackTest, -1, ANCESTORDEFAULT, SMINIT_DEFAULT);However, Visual Studio complains about my
new CallbackTestImpl1()line claiming that it cannot instantiate abstract class. I've looked through the header file that declaresIShellMenuCallback(shobjidl.h) and can't find any other methods that I'm not implementing. Am I missing something obvious or is there a better way to instantiate something that implements theIShellMenuCallbackinterface? Any help would be much appreciated! -
Hey guys, I don't know much Windows programming (and my C++ is a little rusty), I'm hoping you all can give me a hand. I'm trying to instantiate an
IShellMenuobject (http://msdn.microsoft.com/en-us/library/bb774901(VS.85).aspx). MSDN says to create an object I need to: "call CoCreateInstance with the rclsid parameter set to CLSID_MenuBand and the riid parameter set to IID_IShellMenu. You must first initialize the interface by calling IShellMenu::Initialize, and then initialize the menu band by calling IShellMenu::SetShellFolder." The first step is easy enough, I'm doing this:IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);But I'm running into trouble when I call
aTest->Initialize(). More specifically, the first parameter needs to a pointer to anIShellMenuCallbackobject and I can't figure out how to instantiate something that implements that interface. Ideally, this is what I'd like to do:class CallbackTestImpl1 : public IShellMenuCallback
{
public:
CallbackTestImpl1() { }
~CallbackTestImpl1() { }// Implement the virtual method HRESULT STDMETHODCALLTYPE IShellMenuCallback::CallbackSM(LPSMDATA psmd, UINT uMsg, WPARAM wParam, LPARAM lParam) { return S\_OK; }};
IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);
IShellMenuCallback *aCallbackTest = new CallbackTestImpl1();
aRes = aTest->Initialize(aCallbackTest, -1, ANCESTORDEFAULT, SMINIT_DEFAULT);However, Visual Studio complains about my
new CallbackTestImpl1()line claiming that it cannot instantiate abstract class. I've looked through the header file that declaresIShellMenuCallback(shobjidl.h) and can't find any other methods that I'm not implementing. Am I missing something obvious or is there a better way to instantiate something that implements theIShellMenuCallbackinterface? Any help would be much appreciated!You need to implement the standard IUnknown interface methods: IUnknown::QueryInterface, IUnknown::AddRef, and IUnknown::Release. imo
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Hey guys, I don't know much Windows programming (and my C++ is a little rusty), I'm hoping you all can give me a hand. I'm trying to instantiate an
IShellMenuobject (http://msdn.microsoft.com/en-us/library/bb774901(VS.85).aspx). MSDN says to create an object I need to: "call CoCreateInstance with the rclsid parameter set to CLSID_MenuBand and the riid parameter set to IID_IShellMenu. You must first initialize the interface by calling IShellMenu::Initialize, and then initialize the menu band by calling IShellMenu::SetShellFolder." The first step is easy enough, I'm doing this:IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);But I'm running into trouble when I call
aTest->Initialize(). More specifically, the first parameter needs to a pointer to anIShellMenuCallbackobject and I can't figure out how to instantiate something that implements that interface. Ideally, this is what I'd like to do:class CallbackTestImpl1 : public IShellMenuCallback
{
public:
CallbackTestImpl1() { }
~CallbackTestImpl1() { }// Implement the virtual method HRESULT STDMETHODCALLTYPE IShellMenuCallback::CallbackSM(LPSMDATA psmd, UINT uMsg, WPARAM wParam, LPARAM lParam) { return S\_OK; }};
IShellMenu *aTest;
HRESULT aRes = CoCreateInstance(CLSID_MenuBand, NULL, CLSCTX_INPROC_SERVER, IID_IShellMenu, (void **)&aTest);
IShellMenuCallback *aCallbackTest = new CallbackTestImpl1();
aRes = aTest->Initialize(aCallbackTest, -1, ANCESTORDEFAULT, SMINIT_DEFAULT);However, Visual Studio complains about my
new CallbackTestImpl1()line claiming that it cannot instantiate abstract class. I've looked through the header file that declaresIShellMenuCallback(shobjidl.h) and can't find any other methods that I'm not implementing. Am I missing something obvious or is there a better way to instantiate something that implements theIShellMenuCallbackinterface? Any help would be much appreciated!http://www.codeproject.com/KB/shell/shellextguide1.aspx if you refer to the url which is above , you will find the answer good luck!
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