Set probing path of COM Private Assemblies

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Hi,

I want to achieve the following

I have a MFC Application. This Application on click of button should load a COM dll (say MyDLL.dll) MyDLL.dll is a private assembly which is NOT registered.

I have the following piece of code segment:

C++

actCtx.cbSize = sizeof(ACTCTX);
actCtx.lpSource = _T("C:\\SampleProject1.manifest");
actCtx.dwFlags = ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;
actCtx.lpAssemblyDirectory = _T("C:\\Sample");

HANDLE hCtx = ::CreateActCtx(&actCtx);

if (hCtx == INVALID_HANDLE_VALUE)
{
      MessageBox(
                     NULL,
                    _T("INVALID_HANDLE_VALUE"),
                      "Error Message",
                       MB_OK
                      );
		hCtx = NULL;
		
}
else
{
if (::ActivateActCtx(hCtx, &cookie))
{
 ::CoInitialize(NULL);
 hr = ::CoCreateInstance(CLSID_MyClass, NULL, CLSCTX_INPROC, IID_IDispatch, (void**)&ptrMyDisp);
         
ptrMyDisp->QueryInterface(IID_IMyClass,(void **)&ptrMyClass);
ptrMyClass->Add(1,2);
			
::DeactivateActCtx(0,cookie);
::ReleaseActCtx(hCtx);

hCtx = NULL;
}
}

SampleProject1.manifest contains a reference to MYDLL.dll

My MFC application executes from C:\MFCApplication\Release folder. If I place MYDLL.dll at C:\MFCApplication\Release folder things work correctly.

However I intend to keep the various dlls at some other place. Thus I have specified probing path as C:\Sample. However if I remove the dlls from C:\MFCApplication folder and place them only at C:\Sample the application returns "Class Not Registered error" after CoCreateInstance().

How do I provide a probing path for my private assembly dlls

--------------------------------------------------------------------------------

Posted 29-Dec-11 20:11pm

SB_CodeForFun

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JackDingler · Answer 1 · 2011-12-30T06:01:00

Solution 1

The error "Class Not Registered error" should indicate to you that your COM objects are indeed registered. When you move them, then the environment can't find them.

When you move them, rerun the registration.

Note that Visual Studio will register your objects for you, when you create them. So even though you didn't explicitly register them, they still got registered...

Posted 30-Dec-11 6:01am

JackDingler

Comments

SB_CodeForFun 2-Jan-12 2:41am

I have ensured that MYDLL.dll is not registered.

I am trying to achieve Reg Free COM which I am able to achieve if I install MYDLL.dll in WinSxS folder and use it as shared side by side assembly.

However I want to achieve the same using private assemblies wherein I can specify the probing path if the native DLL is not found in WinSxS