/// <summary>
/// Called to invoke the comamand.
/// </summary>
/// <param name="pici">The command info pointer.</param>
int IContextMenu.InvokeCommand(IntPtr pici)
{
// We'll work out whether the commandis unicode or not...
var isUnicode = false;
// We could have been provided with a CMINVOKECOMMANDINFO or a
// CMINVOKECOMMANDINFOEX - cast to the small and then check the size.
var ici = (CMINVOKECOMMANDINFO)Marshal.PtrToStructure(pici, typeof(CMINVOKECOMMANDINFO));
var iciex = new CMINVOKECOMMANDINFOEX();
// Is it a CMINVOKECOMMANDINFOEX?
if (ici.cbSize == Marshal.SizeOf(typeof(CMINVOKECOMMANDINFOEX)))
{
// Check the unicode flag, get the extended command info.
if ((ici.fMask & CMIC.CMIC_MASK_UNICODE) != 0)
{
isUnicode = true;
iciex = (CMINVOKECOMMANDINFOEX)Marshal.PtrToStructure(pici,
typeof(CMINVOKECOMMANDINFOEX));
}
}
// If we're not unicode and the verb hiword is not zero,
// we've got an ANSI verb string.
if (!isUnicode && User32.HighWord(ici.verb.ToInt32()) != 0)
{
// Get the verb.
var verb = Marshal.PtrToStringAnsi(ici.verb);
// DebugLog this key event.
Log(string.Format("Invoke ANSI verb {0}", verb));
// Try and invoke the command. If we don't invoke it, throw
// E_FAIL so that other handlers can try.
if (!nativeContextMenuWrapper.TryInvokeCommand(verb))
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
// If we're unicode, and the verb hiword is not zero,
// we've got a unicode command string.
else if (isUnicode && User32.HighWord(iciex.verbW.ToInt32()) != 0)
{
// Get the verb.
var verb = Marshal.PtrToStringAnsi(ici.verb);
// DebugLog this key event.
Log(string.Format("Invoke Unicode verb {0}", verb));
// Try and invoke the command. If we don't invoke it, throw
// E_FAIL so that other handlers can try.
if (!nativeContextMenuWrapper.TryInvokeCommand(verb))
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
// The verb pointer isn't a string at all, it's an index.
else
{
// Get the command index. Logically, we don't actually need to
// loword it, as the hiword is zero, but we're following the
// documentation rigourously.
var index = User32.LowWord(ici.verb.ToInt32());
// DebugLog this key event.
Log(string.Format("Invoke command index {0}", index));
// Try and invoke the command. If we don't invoke it, throw
// E_FAIL so that other handlers can try.
if (!nativeContextMenuWrapper.TryInvokeCommand(index))
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
// Return success.
return WinError.S_OK;
}
/// <summary>
/// Saves the invoke command information.
/// </summary>
/// <param name="isUnicode">if set to <c>true</c> the unicode structure is used.</param>
/// <param name="ici">The ici.</param>
/// <param name="iciex">The iciex.</param>
private void SaveInvokeCommandInfo(bool isUnicode, CMINVOKECOMMANDINFO ici, CMINVOKECOMMANDINFOEX iciex)
{
if (isUnicode)
{
// Create command info from the Unicode structure.
currentInvokeCommandInfo = new InvokeCommandInfo
{
WindowHandle = iciex.hwnd,
ShowCommand = iciex.nShow
};
}
else
{
// Create command info from the ANSI structure.
currentInvokeCommandInfo = new InvokeCommandInfo
{
WindowHandle = ici.hwnd,
ShowCommand = ici.nShow
};
}
}