CreateDialog returning 0 but getting ERROR_SUCCESS - c

Question

The following code returns 0 to wnd but right after the CreateDialog the error is ERROR_SUCCESS. The dialog doesn't show up and I don't understand how this is possible. It's a console project and the dialog is created in vs2013, if that's relevant.
#include <windows.h>
#include "resource.h"
int main(){
HWND wnd = CreateDialog(NULL, MAKEINTRESOURCE(IDD_DIALOG1), NULL, NULL);
ShowWindow(wnd, SW_SHOWDEFAULT);
UpdateWindow(wnd);
MSG msg;
while(GetMessage(&msg, NULL, 0, 0)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
This has to be some really stupid mistake but I can't see it.

Answer 1

You'll need to initialise the rich edit library first - if the library isn't loaded, the control won't be registered and the dialog creation will fail.
See the note at http://msdn.microsoft.com/en-us/library/windows/desktop/hh298375(v=vs.85).aspx about calling LoadLibrary. You need to do this before creating the dialog.
Alternatively setting the DS_NOFAILCREATE style should allow the dialog to be created although the rich edit control won't show up.

Answer 2

Had same exact problem my Dialog wouldn't appear it was in-fact missing the RichText2.0 Control load up.
This is how I fixed it should support any windows version.
Add this include to your project
#include <richedit.h> // To use richedit control
//Load RichText4.1 or 2.0/3.0 or 1.0 (last resort) Control first. (3 different DLL's for full support).
//
// FUNCTION: IsWinXPSp1Min()
//
// PURPOSE: Return TRUE if operating sytem is Windows XP SP1 or later.
// Windows XP SP1 is the minimum system required to use a richedit v4.1 but only
// when UNICODE is defined.
//
BOOL IsWinXPSp1Min()
{
OSVERSIONINFO osvi = { sizeof(osvi) };
if (!GetVersionEx(&osvi))
{
return FALSE;
}
// Determine if system is Windows XP minimum
if (osvi.dwMajorVersion >= 5 && osvi.dwMinorVersion >= 1)
{
// Now check if system is specifically WinXP and, if so, what service pack
// version is installed.
if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1)
{
// The following test assumes that the szCSDVersion member of the
// OSVERSIONINFO struct's format will always be a string like
// "Service Pack x", where 'x' is a number >= 1. This is fine for SP1
// and SP2 but future service packs may have a different string
// descriptor.
TCHAR* pszCSDVersion = L"Service Pack 1";
if (osvi.szCSDVersion < pszCSDVersion)
{
return FALSE;
}
}
return TRUE;
}
return FALSE;
}
//
// FUNCTION: GetRichEditClassName()
//
// PURPOSE: Load the proper version of RichEdit and return the class name.
//
PCWSTR GetRichEditClassName()
{
HINSTANCE hLib;
// Try to load latest version of rich edit control. Since v4.1 is available
// only as an UNICODE control on a minimum of Windows XP with service pack 1
// installed, use preprocessor conditional to ensure that an attempt to load
// Msftedit.dll is only made if UNICODE is defined.
#if defined UNICODE
if (IsWinXPSp1Min())
{
// Try to get richedit v4.1, explicitly use wide character string as this
// is UNICODE only.
hLib = LoadLibrary(L"msftedit.dll");
if (hLib)
{
return MSFTEDIT_CLASS;
}
}
#endif
// Cannot get latest version (v4.1) so try to get earlier one
// Rich Edit Version 2.0/3.0
hLib = LoadLibrary(L"riched20.dll");
if (hLib)
{
// Version 2.0/3.0 is good
return RICHEDIT_CLASS;
}
// Rich Edit Version 1.0
hLib = LoadLibrary(L"riched32.dll");
if (hLib)
{
// Version 1.0 is good
return L"RichEdit";
}
// Cannot get any versions of RichEdit control (error)
return L"";
}
resource.h file
#define IDC_RICHEDIT 3990
Create the actual RichEdit control
// // FUNCTION: OnInitRichEditDialog(HWND, HWND, LPARAM) // // PURPOSE: Process the WM_INITDIALOG message // BOOL OnInitRichEditDialog(HWND hWnd, HWND hWndFocus, LPARAM lParam) {
RECT rc = { 20, 20, 160, 250 };
HWND hRichEdit = CreateWindowEx(WS_EX_CLIENTEDGE, GetRichEditClassName(),
L"RichEdit Control",
ES_MULTILINE | ES_AUTOHSCROLL | WS_HSCROLL | ES_AUTOVSCROLL |
WS_VSCROLL | WS_CHILD | WS_VISIBLE,
rc.left, rc.top, rc.right, rc.bottom,
hWnd, reinterpret_cast<HMENU>(IDC_RICHEDIT), g_hInst, 0);
if (hRichEdit)
{
SendMessage(hRichEdit, WM_SETFONT, reinterpret_cast<WPARAM>(g_hFont), TRUE);
}
return TRUE; }