What steps do I need to take to enable VS2010's Process Debug Manager specifically for JavaScript?

I have a unique server application (not a website, not HTML- or browser-based) that offers extensibility through JavaScript scripts. I am supposed to be able to debug these scripts with Visual Studio's debugger using the Process Debug Manager.

Even though I have VS2010 properly installed and activated, when I use CoCreateInstance to call like this:

CoCreateInstance(CLSID_ProcessDebugManager, nil,
  CLSCTX_INPROC_SERVER or CLSCTX_LOCAL_SERVER, IProcessDebugManager, _PDM);

I encounter the error $80070057 (E_INVALIDARG), which is not the expected behavior for CoCreateInstance according to the documentation. However, the documentation provides an alternative method using CoGetClassObject, but when I try that, I receive REGDB_E_CLASSNOTREG, indicating that the CLSID is not registered in the Registry.

What steps should I take to register VS2010's script debugger in the Registry so that I can successfully utilize the Process Debug Manager?

javascriptvisual-studiovisual-studio-2010debuggingcom

Answer №1

If you're encountering the REGDB_E_CLASSNOTREG error, it is likely due to a mix of 32- and 64-bit components. This could happen if you are attempting to utilize CoCreateInstance from a 64-bit program without the appropriate version of VS2010 (if there even is a 64-bit version available).

Additionally, I came across this where someone mistakenly passed a pointer to void instead of a pointer to a pointer. Without knowing the type of _PDM, it's unclear if it was declared correctly, although a compiler warning should have been triggered in that case.

Updated to include:

#pragma comment(lib, "ole32.lib")

#define UNICODE
#define STRICT
#include <windows.h>
#include <activdbg.h>

#include <iostream>
using std::wcout;
using std::hex;
using std::endl;

int main(void)
{
    HRESULT hr;

    IProcessDebugManager *ppdm = NULL;
    IDebugApplication *pda = NULL;
    IClassFactory *pcf = NULL;
    DWORD cook = 0;

    CoInitialize(NULL);

    hr = CoGetClassObject(CLSID_ProcessDebugManager, CLSCTX_INPROC_SERVER,
        NULL, IID_IClassFactory, (LPVOID *)&pcf);
    wcout << L"CoGetClassObject: " << std::hex << hr << endl;
    if (FAILED(hr)) goto done;

    hr = pcf->CreateInstance(0, IID_IProcessDebugManager32, (LPVOID *)&ppdm);
    wcout << L"CreateInstance: " << std::hex << hr << endl;
    if (FAILED(hr)) goto done;
    pcf->Release();

    hr = ppdm->CreateApplication(&pda);
    wcout << L"CreateApplication: " << std::hex << hr << endl;
    if (FAILED(hr)) goto done;

    ppdm->AddApplication(pda, &cook);
    pda->SetName(L"Moosh!");
    ppdm->RemoveApplication(cook);
    pda->Release();
    ppdm->Release();
done:
    CoUninitialize();
    return 0;
}

Minimal error checking in place, primarily testing a basic function. While there is no direct indication of what "not working" entails, the snippet provided successfully retrieves an IProcessDebugManager and an IDebugApplication.

Answer №2

The E_INVALIDARG error typically occurs when an incorrect argument is passed to a function. It can be quite unclear what exactly went wrong, possibly due to the interaction between CLR and COM.

It seems like IProcessDebugManager is a CLR interface. You can find more information about it at this link.

It's possible that Parameter 4 is expecting a CLR interface instead of a REFIID. However, without knowing the specific language you are using, it's hard to determine. For example, 'nil' is not recognized in C#, which uses 'null', C++/CLI uses 'nullptr', and VB uses 'Nothing'.

Could it be that your compiler is converting the CLR type to a string and passing that as a GUID? It's likely that COM is expecting a proper GUID for the REFIID parameter and is unable to parse whatever IProcessDebugManager.ToString() returns.

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