// Populate a list of all the child windows of a given parent
// (Uses the Win32 API's EnumChildWindows() function)
private static List <IntPtr> listChildWindows(IntPtr p)
{
List <IntPtr> lstChildWindows = new List <IntPtr>();
GCHandle gchChildWindows = GCHandle.Alloc(lstChildWindows);
try
{
WindowsInterop.EnumChildWindows(p,
new EnumerateWindowDelegate(WindowsInterop.enumWindowsCallback),
GCHandle.ToIntPtr(gchChildWindows));
}
finally
{
if (gchChildWindows.IsAllocated)
{
gchChildWindows.Free();
}
}
return(lstChildWindows);
}
// Hook proceedure called by the OS when a message has been processed by the target Window
private static Int32 WH_CALLWNDPROCRET_PROC(Int32 iCode, IntPtr pWParam, IntPtr pLParam)
{
if (iCode < 0)
{
return(CallNextHookEx(WindowsInterop._pWH_CALLWNDPROCRET, iCode, pWParam, pLParam));
}
CWPRETSTRUCT cwp = (CWPRETSTRUCT)
Marshal.PtrToStructure(pLParam, typeof(CWPRETSTRUCT));
if (cwp.message == WM_INITDIALOG)
{
// A dialog was initialised, find out what sort it was via it's Caption text
Int32 iLength = GetWindowTextLength(cwp.hwnd);
StringBuilder sb = new StringBuilder(iLength + 1);
GetWindowText(cwp.hwnd, sb, sb.Capacity);
if (StringConstants.DialogCaptionSecurityAlert.Equals(sb.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// A "Security Alert" dialog was initialised, now need
//
// a) To know what type it is - e.g. is it an SSL related one or a switching b/w
// secure/non-secure modes etc one - and,
//
// b) A handle to the 'Yes' button so a user-click can be simulated on it
//
Boolean blnIsSslDialog = true; // assumed true for now
IntPtr pYesButtonHwnd = IntPtr.Zero;
// Check out further properties of the dialog
foreach (IntPtr pChildOfDialog in WindowsInterop.listChildWindows(cwp.hwnd))
{
// Go through all of the child controls on the dialog and see what they reveal via their text
iLength = GetWindowTextLength(pChildOfDialog);
if (iLength > 0)
{
StringBuilder sbProbe = new StringBuilder(iLength + 1);
GetWindowText(pChildOfDialog, sbProbe, sbProbe.Capacity);
if (StringConstants.DialogTextSecureToNonSecureWarning.Equals(sbProbe.ToString(),
StringComparison.InvariantCultureIgnoreCase) ||
StringConstants.DialogTextNonSecureToSecureWarning.Equals(sbProbe.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// Ok, the text says something about toggling secure/non-secure or vice-versa so,
blnIsSslDialog = false;
}
if (StringConstants.ButtonTextYes.Equals(sbProbe.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
// Hey, this one says 'Yes', so cache a pointer to it
pYesButtonHwnd = pChildOfDialog;
// NB: Could also confim it is a button we're pointing at, at this point, and
// not a label or something by using the Win32 API's GetClassName() function (see below for e.g.),
// but in this case it is already known that a button is the only thing saying 'Yes'
// on this particular dialog
}
}
}
// Ok, some sort of "Security Alert" dialog was initialised, fire a message
// to anyone who's listening i.e. In this case, ask the event receiver if
// they want to ignore it
if (SecurityAlertDialogWillBeShown != null)
{
if (SecurityAlertDialogWillBeShown(blnIsSslDialog) && pYesButtonHwnd != IntPtr.Zero)
{
// Alert the dialog's message-pump that the 'Yes' button was 'Pressed'
Int32 ctrlId = GetDlgCtrlID(pYesButtonHwnd);
SendMessage(cwp.hwnd, WM_COMMAND, new IntPtr(ctrlId), pYesButtonHwnd);
// Block any further processing of the WM_INITDIALOG message by anyone else
// This is important: by doing this, the dialog never shows up on the screen
return(1);
}
}
}
else if (sb.ToString().StartsWith(StringConstants.DialogCaptionConnectTo))
{
// 'Connect to ...' style dialog shown
IntPtr pComboHwnd = IntPtr.Zero;
IntPtr pEditHwnd = IntPtr.Zero;
IntPtr pOkButtonHwnd = IntPtr.Zero;
foreach (IntPtr pChildOfDialog in WindowsInterop.listChildWindows(cwp.hwnd))
{
// Go through all of the child controls on the dialog and see what they reveal via their type/text
StringBuilder sbProbe = new StringBuilder(255);
if (GetClassName(pChildOfDialog, sbProbe, sbProbe.Capacity) != 0 &&
!String.IsNullOrEmpty(sbProbe.ToString()))
{
if (sbProbe.ToString().Equals("SysCredential"))
{
// This control is actually a set of controls called a "SysCredential"
// (as determined via Spy++), so cache it's child controls that are of
// type "ComboBoxEx32" and "Edit"
foreach (IntPtr pChildOfSysCredential in WindowsInterop.listChildWindows(pChildOfDialog))
{
StringBuilder sbProbe2 = new StringBuilder(255);
if (GetClassName(pChildOfSysCredential, sbProbe2, sbProbe2.Capacity) != 0 &&
!String.IsNullOrEmpty(sbProbe2.ToString()))
{
if (StringConstants.WindowTypeCombo.Equals(sbProbe2.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// Hey, here's the Combo
pComboHwnd = pChildOfSysCredential;
}
if (StringConstants.WindowTypeEdit.Equals(sbProbe2.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// Hey, here's *an* Edit box.
//
// This will happen several times as there is an Edit box at the bottom of
// the "ComboBoxEx" heirarchy as well, but luckily the last one encountered
// is actually the required one
pEditHwnd = pChildOfSysCredential;
}
}
}
}
if (StringConstants.WindowTypeButton.Equals(sbProbe.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// This control is a Button, does it have text, if so what does it say
iLength = GetWindowTextLength(pChildOfDialog);
if (iLength > 0)
{
StringBuilder sbText = new StringBuilder(iLength + 1);
GetWindowText(pChildOfDialog, sbText, sbText.Capacity);
if (StringConstants.ButtonTextOk.Equals(sbText.ToString(),
StringComparison.InvariantCultureIgnoreCase))
{
// Hey, this one says 'OK', so cache a pointer to it
pOkButtonHwnd = pChildOfDialog;
}
}
}
}
}
// Ok, a "Connect to" dialog was initialiased, fire a message to anyone who's interested
// i.e. Ask the event receiver if they want to automate the dialog by providing
// a username and password with which to populate the dialog
if (ConnectToDialogWillBeShown != null)
{
String sUsername = null;
String sPassword = null;
if (ConnectToDialogWillBeShown(ref sUsername, ref sPassword) &&
sUsername != null && sPassword != null && pOkButtonHwnd != IntPtr.Zero &&
pComboHwnd != IntPtr.Zero && pEditHwnd != IntPtr.Zero)
{
// Yep, they do
// Put the username and password into the boxes
SetWindowText(pComboHwnd, sUsername);
SetWindowText(pEditHwnd, sPassword);
// Alert the dialog's message-pump that the 'OK' button was 'Pressed'
Int32 ctrlId = GetDlgCtrlID(pOkButtonHwnd);
SendMessage(cwp.hwnd, WM_COMMAND, new IntPtr(ctrlId), pOkButtonHwnd);
// Block further processing of the WM_INITDIALOG message by anyone else
// This is important: by doing this, the dialog never shows up on the screen
return(1);
}
}
}
}
// Call the next hook in the chain
return(CallNextHookEx(WindowsInterop._pWH_CALLWNDPROCRET, iCode, pWParam, pLParam));
}
