Windows Dialog Box not getting opened

Question

Im trying to open a Dialog box in Windows machine(using windows credential provider), when the user presses a button. i tried the below code but, dialog box is not getting opened. i have a resource "IDD_DIALOG1" and callback method "ChangePasswordProc".

HWND hwndOwner = nullptr;

::DialogBox(HINST_THISDLL, MAKEINTRESOURCE(IDD_DIALOG1), hwndOwner,ChangePasswordProc);

Are you able to see your dialog if you press `Alt+Tab`? It is possible that the dialog is hidden behind credential provider — Wander3r, Mar 29 '19 at 07:05
Are You trying to raise dialogue from inside of Credential Provider? Inside of which method You are doing it? — Alexander, Mar 29 '19 at 13:46
What have you tried? Have you looked at the value returned by the DialogBox call? Have you verified that IDD_DIALOG1 refers to a valid dialog box resource and that the resources are linked into your project? Have you looked with Spy++ to see if the window exists but it simply offscreen or missing WS_VISIBLE? — Adrian McCarthy, Mar 29 '19 at 18:47

score 0 · Answer 1 · answered Mar 29 '19 at 07:24

0

I didn't write in Windows GUI for a looong time, but perhaps try something like this:

HWND dialog = ::DialogBox(HINST_THISDLL, MAKEINTRESOURCE(IDD_DIALOG1), hwndOwner,ChangePasswordProc);
ShowWindow(dialog, SW_SHOW);

I remember, that creating window does not imply showing it - it must be done explicitly.

answered Mar 29 '19 at 07:24

Diodacus

663
3
8

i tried this too HWND hwndGoto = NULL; // Window handle of dialog box if (!IsWindow(hwndGoto)) { PrintLn("No previous Window available"); hwndGoto = CreateDialog(HINST_THISDLL, MAKEINTRESOURCE(IDB_TILE_IMAGE), hwndOwner, nullptr); ShowWindow(hwndGoto, SW_SHOW); } – Navin Mar 29 '19 at 10:13

score 0 · Answer 2 · answered Mar 29 '19 at 15:36

To create any window from inside of Credential Provider you must first get parent window handle by calling OnCreatingWindow method of ICredentialProviderCredentialEvents interface.

HRESULT OnCreatingWindow([out] HWND* phwndOwner);

Pointer to this interface is supplying to your provider by calling Advise method of its ICredentialProviderCredential interface :

HRESULT Advise([in] ICredentialProviderCredentialEvents* pcpce);

Have a look at this post.

Windows Dialog Box not getting opened

2 Answers2

Linked