Help Creating a Custom Class Modeless Dialog Box

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I'm trying to create a custom class name for my modeless dialog box.
The following shows a snippet from my .rc file and the code to create
the dialog. Everything works fine until I get a NULL handle returned
with CreateDialog (which I understand to be a wrapper for
CreateWindowEx). The GetLastError is ERROR_SUCCESS. I'm not
understanding what I'm doing wrong here.

IDRESULTS DIALOGEX 0, 0, 412, 232
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_MINIMIZEBOX |
WS_POPUP | WS_CAPTION | WS_SYSMENU
EXSTYLE WS_EX_CONTROLPARENT
CAPTION "Results"
CLASS "MyClass"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN

HWND hwndDlg = NULL;
WNDCLASSEX wcx;

if(!GetClassInfoEx(hInst,"#32770",&wcx))
ErrorExit(TEXT("GetClassInfoEx"));
wcx.lpfnWndProc = DlgResultsProc;
wcx.cbSize = sizeof(wcx);
wcx.lpszClassName = "MyClass";
if(!RegisterClassEx(&wcx))
ErrorExit(TEXT("RegisterClassEx"));

//create a modless (non-blocking dialog box)
hwndDlg = (HWND)CreateDialog(hInst,
MAKEINTRESOURCE(IDRESULTS),
hwnd, //this is the handle to the main window that owns it
DlgResultsProc); //pointer to dialog box procedure
if(hwndDlg == NULL)
ErrorExit(TEXT("CreateDialog"));
ShowWindow(hwndDlg,SW_SHOW); // Make the window visible
UpdateWindow(hwnd); //redraw the window
return hwndDlg;

Posted 10-Apr-10 14:49pm

voisdnull

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voisdnull · Answer 1 · 2010-04-10T14:57:00

I figured it out. This is how I did it:

HWND hwndDlg = NULL;
WNDCLASSEX wcx;

wcx.cbSize = sizeof(wcx);
if(!GetClassInfoEx(hInst,"#32770",&wcx))
ErrorExit(TEXT("GetClassInfoEx"));
wcx.lpszClassName = "MyClass";
if(!RegisterClassEx(&wcx))
ErrorExit(TEXT("RegisterClassEx"));

//create a modless (non-blocking dialog box)
hwndDlg = (HWND)CreateDialog(hInst, //handle to the executable of this program
MAKEINTRESOURCE(IDRESULTS), //select the dialog box template to display
hwnd, //this is the handle to the main window that owns it
DlgResultsProc); //pointer to dialog box procedure
if(hwndDlg == NULL)
ErrorExit(TEXT("CreateDialog"));
ShowWindow(hwndDlg,SW_SHOW); // Make the window visible
UpdateWindow(hwnd); //redraw the window
return hwndDlg;