Using COM Object Invalid Pointer Error

Ash_VCPP

Hi All, I have created COM component(dll) and created one client to use it, Please finnd the code of client:-

HRESULT hr = CoInitialize(0);
//CoCreateInstance(
SCRIPTOBJLib::IScriptObjPtr sobj;
//sobj->QueryInterface(IId_,void* &vp);
//HRESULT hRes = CComObject<CScriptObj>::CreateInstance(&sobj);
//CreateInstance(NULL,IID_IUnknown,(void*)&vp);
//HRESULT hres = sobj.CreateInstance ( __uuidof(SCRIPTOBJLib::IScriptObj) );

	//HRESULT hres = sobj.CreateInstance("ScriptObj 1.0 Type Library");
	//at this point i am getting the error
	sobj->SetLanguage((unsigned short \*)"VBScript");
	CoUninitialize();

Please give me some solutions coz i tried every possible way.

Thanks A Ton Ash_VCPP walking over water is just knowing where the stones are.....

Lost User

Ash_VCPP wrote:

SCRIPTOBJLib::IScriptObjPtr sobj; //sobj->QueryInterface(IId_,void* &vp);

You have not initialized sobj to an instance of anything.

Ash_VCPP

Yes but i tried many ways as you can see it in commented code to initialize it, but getting error HRESULT value= -2147221164. can you please suggest me how can i initialize com object with example regards of my code.

Thanks A Ton Ash_VCPP walking over water is just knowing where the stones are.....

Lost User

Ash_VCPP wrote:

can you please suggest me how can i initialize com object with example regards of my code.

You have the following declaration in your code

SCRIPTOBJLib::IScriptObjPtr sobj;

So you need to initialize sobj to an instance of SCRIPTOBJLib::IScriptObjPtr. The documentation should explain how to do this. If you do not understand instances of classes I suggest you refer back to he C++ documentation for guidance.

Ash_VCPP

But i think initializing COM object is different from normal class, and if not then can you please show me few lines of code to initialize COM object, Because i am wondering with google since last two dyas.

Thanks A Ton Ash_VCPP walking over water is just knowing where the stones are.....

Lost User

As I said in my previous entry you need to use the documentation; I have not used the library that you are working with. Perhaps some time reading through some of the COM articles here on CodeProject would be time well spent.

Jeff Archer

The HRESULT you have indicated is 0x80040152 - Could not find the key in the registry Sounds like the COM object you are trying to use is not correctly installed or you are not using the correct ProgID. Try using a CLASSID for your CreateInstance.

Ash_VCPP

Hi Jeff, I think the helpstring which we pass in idl file will be the progID please let me know if i am wrong,So here i am using below line to get the class id:- HRESULT hres1 = CLSIDFromProgID(OLESTR("ScriptObj 1.0 Type Library"), &clsid); But still i am getting the same error.I have seen registry entry for my dll and its there with the string i mentioned in above function.Please provide me some suggestions on this.

Thanks A Ton Ash_VCPP walking over water is just knowing where the stones are.....

Jeff Archer

If the return from this is 0x80040152 it is not being found in the registry. I suggest try the class id just as the next step of investigation. This HRESULT is either the client not registered correctly or using the incorrect ProdID.