Set default directory with GetTempDir?

When my 'Options' dialog loads up the first time the control for the 'default save path' is empty.
I've tried to use the GetTempDirectory API to fill it upon initialization but I must be doing something wrong.
After selecting the 'browse' button and seleting the default path once everything works as I expected.

Here is my code

Code:

---

BOOL CALLBACK OptionsProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
        CoInitialize(0);

        static char szDirectory[MAX_PATH];
        HRESULT hr;
        BROWSEINFO browseInfo;
        LPITEMIDLIST lpItemList=0;

        LPMALLOC lpM;
        hr = SHGetMalloc (&lpM) ;
        if (FAILED(hr) ) return 0;

        ZeroMemory ( (PVOID) &browseInfo,sizeof (BROWSEINFO));
 
          browseInfo.pidlRoot = 0;
        browseInfo.hwndOwner = NULL;
        browseInfo.pszDisplayName = szDirectory;
        browseInfo.lpszTitle = "Open Folder ";
        browseInfo.ulFlags = BIF_RETURNFSANCESTORS|BIF_RETURNONLYFSDIRS;
        browseInfo.lParam = 0;


        switch (Message)
        {
        case WM_INITDIALOG:
                //  Try to set text to default path... Not working!
                if(pTempDirectoryPath[0] != NULL)// if already set just display it.
                {
                        hdlg = GetDlgItem(hwnd,IDC_OUTPUT_FILES_LOCATIONS);
                        SetWindowText (hdlg, pTempDirectoryPath[0]);
                }
                else //(pTempDirectoryPath[0]) ***
/***************shouldn't this set it?*************/
                {
                        char TempDirectoryPath[MAX_PATH+1];
                        GetTempPath(MAX_PATH+1, TempDirectoryPath);
                        //pTempDirectoryPath[0] = &TempDirectoryPath[0];
                        //SetWindowText (hdlg, pTempDirectoryPath[0]);
                        SetWindowText (hdlg, TempDirectoryPath);
                }

                if(bSaveComposite)        // If radio button is set,
                {
                        hdlg = GetDlgItem(hwnd,IDC_OPTIONS_SAVE_COMPOSITE );
                        SendMessage(hdlg, BM_SETCHECK, 1,0);
                }
                else        // set other button.
                {
                        hdlg = GetDlgItem(hwnd,IDC_OPTIONS_SAVE_ALL );
                        SendMessage(hdlg, BM_SETCHECK, 1,0);
                        bSaveComposite = FALSE;
                }
                return TRUE;
        case WM_COMMAND:
switch (LOWORD(wParam))
                {
                case IDOK:
                        // checks to see if radio save_all is set, if so change BOOL.
                        if(SendMessage(GetDlgItem(hwnd,IDC_OPTIONS_SAVE_ALL ), BM_GETCHECK,
                                (WPARAM)0 ,(LPARAM)0) == BST_CHECKED)
                                bSaveComposite = FALSE;
                        EndDialog(hwnd, IDCANCEL);
                        break;
                case IDBROWSE:
                        if ((lpItemList = SHBrowseForFolder(&browseInfo)) == NULL)
                        {
                                return 0;
                        }
                        SHGetPathFromIDList(lpItemList,szDirectory);
                       
                        hdlg = GetDlgItem(hwnd,IDC_OUTPUT_FILES_LOCATIONS);
                        pTempDirectoryPath[0] = szDirectory;       
                        SetWindowText (hdlg, pTempDirectoryPath[0]);
                        lpM->Free(lpItemList);
                        lpM->Release();
                        break;
                case IDCANCEL:
                        MessageBeep (0);
                        EndDialog(hwnd, IDCANCEL);
                        break;
                }
                default:
            return FALSE;
        }
        return TRUE;
}

---

All the other cases in my code seems to work I just posted them for clarity.

I just thought I'd post my code so when someone else searches for this they can see a solution too.

I hate it when I do a search find the same question but no answer!

Code:

---

        case WM_INITDIALOG:
                static char TempDirectoryPath[MAX_PATH+1];
                // if first time thru initialize with temp dir.
                if(pTempDirectoryPath[0] == NULL)
                {
                        GetTempPath(MAX_PATH+1, TempDirectoryPath);
                        pTempDirectoryPath[0] = &TempDirectoryPath[0];

                        // Convert to long path name.
                        GetLongPathName(
                                TempDirectoryPath,
                                pTempDirectoryPath[0],
                                MAX_PATH+1);
                }
                // if not first time thru keep users selection.
                hdlg = GetDlgItem(hwnd,IDC_OUTPUT_FILES_LOCATIONS);
                SetWindowText (hdlg, pTempDirectoryPath[0]);
                if(bSaveComposite)        // If radio button is set,
                {
                        hdlg = GetDlgItem(hwnd,IDC_OPTIONS_SAVE_COMPOSITE );
                        SendMessage(hdlg, BM_SETCHECK, 1,0);
                }
                else        // else set other button.
                {
                        hdlg = GetDlgItem(hwnd,IDC_OPTIONS_SAVE_ALL );
                        SendMessage(hdlg, BM_SETCHECK, 1,0);
                        bSaveComposite = FALSE;
                }
                return TRUE;




        case IDBROWSE:
                if ((lpItemList = SHBrowseForFolder(&browseInfo)) == NULL)
                {
                        return 0;
                }
                SHGetPathFromIDList(lpItemList,szDirectory);
                hdlg = GetDlgItem(hwnd,IDC_OUTPUT_FILES_LOCATIONS);
                pTempDirectoryPath[0] = szDirectory;       
                SetWindowText (hdlg, pTempDirectoryPath[0]);
                lpM->Free(lpItemList);
                lpM->Release();
                break;

---

The major difference I see between the two code listings is that the TempDirectoryPath string is effectively allocated on the heap in the working sample (declared static), while in the failed code sample, the control is told about the text buffer although it is deallocated once the code steps out of OptionsProc(). Could this transient vs. more permanent text buffer be the cause?