/// <summary>
/// Carry out the command associated with a shortcut menu item.
/// </summary>
/// <param name="pici">
/// A pointer to a CMINVOKECOMMANDINFO or CMINVOKECOMMANDINFOEX structure
/// containing information about the command.
/// </param>
public void InvokeCommand(IntPtr pici)
{
bool isUnicode = false;
// Determine which structure is being passed in, CMINVOKECOMMANDINFO or
// CMINVOKECOMMANDINFOEX based on the cbSize member of lpcmi. Although
// the lpcmi parameter is declared in Shlobj.h as a CMINVOKECOMMANDINFO
// structure, in practice it often points to a CMINVOKECOMMANDINFOEX
// structure. This struct is an extended version of CMINVOKECOMMANDINFO
// and has additional members that allow Unicode strings to be passed.
CMINVOKECOMMANDINFO ici = (CMINVOKECOMMANDINFO)Marshal.PtrToStructure(
pici, typeof(CMINVOKECOMMANDINFO));
CMINVOKECOMMANDINFOEX iciex = new CMINVOKECOMMANDINFOEX();
if (ici.cbSize == Marshal.SizeOf(typeof(CMINVOKECOMMANDINFOEX)))
{
if ((ici.fMask & CMIC.CMIC_MASK_UNICODE) != 0)
{
isUnicode = true;
iciex = (CMINVOKECOMMANDINFOEX)Marshal.PtrToStructure(pici,
typeof(CMINVOKECOMMANDINFOEX));
}
}
// Determines whether the command is identified by its offset or verb.
// There are two ways to identify commands:
//
// 1) The command's verb string
// 2) The command's identifier offset
//
// If the high-order word of lpcmi->lpVerb (for the ANSI case) or
// lpcmi->lpVerbW (for the Unicode case) is nonzero, lpVerb or lpVerbW
// holds a verb string. If the high-order word is zero, the command
// offset is in the low-order word of lpcmi->lpVerb.
// For the ANSI case, if the high-order word is not zero, the command's
// verb string is in lpcmi->lpVerb.
if (!isUnicode && NativeMethods.HighWord(ici.verb.ToInt32()) != 0)
{
// Is the verb supported by this context menu extension?
if (Marshal.PtrToStringAnsi(ici.verb) == this._verb)
{
return;
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
// For the Unicode case, if the high-order word is not zero, the
// command's verb string is in lpcmi->lpVerbW.
else if (isUnicode && NativeMethods.HighWord(iciex.verbW.ToInt32()) != 0)
{
// Is the verb supported by this context menu extension?
if (Marshal.PtrToStringUni(iciex.verbW) == this._verb)
{
return;
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
// If the command cannot be identified through the verb string, then
// check the identifier offset.
else
{
// Is the command identifier offset supported by this context menu
// extension?
int Count = NativeMethods.LowWord(ici.verb.ToInt32());
if (0 <= Count && Count < _printerList.Count)
{
ExecuteCommand(ici.verb.ToInt32());
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
}
/// <summary>
/// Carry out the command associated with a shortcut menu item.
/// </summary>
/// <param name="pici">
/// A pointer to a CMINVOKECOMMANDINFO or CMINVOKECOMMANDINFOEX structure
/// containing information about the command.
/// </param>
public void InvokeCommand(IntPtr pici)
{
bool isUnicode = false;
// Determine which structure is being passed in, CMINVOKECOMMANDINFO or
// CMINVOKECOMMANDINFOEX based on the cbSize member of lpcmi. Although
// the lpcmi parameter is declared in Shlobj.h as a CMINVOKECOMMANDINFO
// structure, in practice it often points to a CMINVOKECOMMANDINFOEX
// structure. This struct is an extended version of CMINVOKECOMMANDINFO
// and has additional members that allow Unicode strings to be passed.
CMINVOKECOMMANDINFO ici = (CMINVOKECOMMANDINFO)Marshal.PtrToStructure(
pici, typeof(CMINVOKECOMMANDINFO));
CMINVOKECOMMANDINFOEX iciex = new CMINVOKECOMMANDINFOEX();
if (ici.cbSize == Marshal.SizeOf(typeof(CMINVOKECOMMANDINFOEX)))
{
if ((ici.fMask & CMIC.CMIC_MASK_UNICODE) != 0)
{
isUnicode = true;
iciex = (CMINVOKECOMMANDINFOEX)Marshal.PtrToStructure(pici,
typeof(CMINVOKECOMMANDINFOEX));
}
}
// Determines whether the command is identified by its offset or verb.
// There are two ways to identify commands:
//
// 1) The command's verb string
// 2) The command's identifier offset
//
// If the high-order word of lpcmi->lpVerb (for the ANSI case) or
// lpcmi->lpVerbW (for the Unicode case) is nonzero, lpVerb or lpVerbW
// holds a verb string. If the high-order word is zero, the command
// offset is in the low-order word of lpcmi->lpVerb.
// For the ANSI case, if the high-order word is not zero, the command's
// verb string is in lpcmi->lpVerb.
if (!isUnicode && NativeMethods.HighWord(ici.verb.ToInt32()) != 0)
{
// Is the verb supported by this context menu extension?
if (Marshal.PtrToStringAnsi(ici.verb) == this._verb)
{
return;
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
// For the Unicode case, if the high-order word is not zero, the
// command's verb string is in lpcmi->lpVerbW.
else if (isUnicode && NativeMethods.HighWord(iciex.verbW.ToInt32()) != 0)
{
// Is the verb supported by this context menu extension?
if (Marshal.PtrToStringUni(iciex.verbW) == this._verb)
{
return;
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
// If the command cannot be identified through the verb string, then
// check the identifier offset.
else
{
// Is the command identifier offset supported by this context menu
// extension?
int Count = NativeMethods.LowWord(ici.verb.ToInt32());
if (0 <= Count && Count < _printerList.Count)
{
ExecuteCommand(ici.verb.ToInt32());
}
else
{
// If the verb is not recognized by the context menu handler, it
// must return E_FAIL to allow it to be passed on to the other
// context menu handlers that might implement that verb.
Marshal.ThrowExceptionForHR(WinError.E_FAIL);
}
}
}
