pointer to pointer manipulation

I'm having some confusion trying to access pAdditionalFileNames in the function below. Basically I have been passing that function as shown:

Code:

---


                        wstring additions[3];
                        additions[0] = L"black.dll";
                        additions[1] = L"white.dll";
                        additions[2] = L"yellow.dll";
                        //additions[3] = L"green.dll";

                        PdfPrnInstCopyDriverFilesExW(L"E:\\test",
                                                                        L"E:\\Research\\Hello",
                                                                        (const WCHAR**) additions,
                                                                        sizeof(additions));

---

into the function as shown:

Code:

---

BOOL someFunc(const WCHAR* destFolder, const WCHAR* pSourceFolder,  const WCHAR** pAdditionalFileNames,  size_t nAdditionalFileNamesSize)
{
        // Determine amount of additional files passed to the function by
        // dividing the amount of bytes needed by amount of bytes per entry (32 bytes/entry)
        size_t nEntries = nAdditionalFileNamesSize/32;

        wcout << "nAdditionalFileNamesSize = " << nAdditionalFileNamesSize << endl;

        /*wstring *pAddFileNamesStrings = (wstring*) pAdditionalFileNames;
        for (int i=1; i < 5; i++)
        {
                wcout << "file " << i << " = " << *pAddFileNamesStrings << endl;
                pAddFileNamesStrings++;
        }*/
       

        return TRUE;
}

---

I have tried the code highlighted in green to address the pointer to pointer, however, it seems that I am not addressing the memory properly, hence runtime errors during testing. Does anyone have pointers on ways to obtain the contents of pAdditionalFileNames? Thanks.

You pass the array wrong and you access the array wrong.
Pass it as a simple WCHAR* pointer (unless wstring is a typedef for WCHAR*?), and access it using str[n].
If it's a 2D array, then the easiest way is to pass dimensions, like:

const WCHAR (*pAdditionalFileNames)[3]

But the question begs: are you passing a string to Windows API? If so, then you must pass a pointer to the first element.
If you are passing it to a C++ function, then use std::vector<std::string> and a (const) reference to that.

I'd expect wstring to be std::wstring, i.e. std::basic_string<wchar_t>. Of course, that makes the cast of the array to WCHAR** all the more horrible.

I expect the same thing, but I can't be 100&#37; sure due to the C-style casts...