you can try Globals.ThisAddIn.Application.Caller, it returns an Excel.Range containing the cell. Maybe something like this to get Excel.Application
public class InteropHelper
{
public static void GetReferences(ref Microsoft.Office.Interop.Excel.Application _Application, ref Microsoft.Office.Interop.Excel.Workbook _Workbook)
{
EnumChildCallback cb;
// First, get Excel's main window handle.
int hwnd = (int)Process.GetCurrentProcess().MainWindowHandle;
// We need to enumerate the child windows to find one that
// supports accessibility. To do this, instantiate the
// delegate and wrap the callback method in it, then call
// EnumChildWindows, passing the delegate as the 2nd arg.
if (hwnd != 0)
{
int hwndChild = 0;
cb = new EnumChildCallback(EnumChildProc);
EnumChildWindows(hwnd, cb, ref hwndChild);
// If we found an accessible child window, call
// AccessibleObjectFromWindow, passing the constant
// OBJID_NATIVEOM (defined in winuser.h) and
// IID_IDispatch - we want an IDispatch pointer
// into the native object model.
if (hwndChild != 0)
{
const uint OBJID_NATIVEOM = 0xFFFFFFF0;
Guid IID_IDispatch = new Guid(
"{00020400-0000-0000-C000-000000000046}");
Microsoft.Office.Interop.Excel.Window ptr = null;
int hr = AccessibleObjectFromWindow(
hwndChild, OBJID_NATIVEOM, IID_IDispatch.ToByteArray(), ref ptr);
if (hr >= 0)
{
// If we successfully got a native OM
// IDispatch pointer, we can QI this for
// an Excel Application (using the implicit
// cast operator supplied in the PIA).
_Application = ptr.Application;
_Workbook = _Application.ActiveWorkbook;
}
}
}
}
[DllImport("Oleacc.dll")]
public static extern int AccessibleObjectFromWindow(
int hwnd, uint dwObjectID, byte[] riid,
ref Microsoft.Office.Interop.Excel.Window ptr);
public delegate bool EnumChildCallback(int hwnd, ref int lParam);
[DllImport("User32.dll")]
public static extern bool EnumChildWindows(
int hWndParent, EnumChildCallback lpEnumFunc,
ref int lParam);
[DllImport("User32.dll")]
public static extern int GetClassName(
int hWnd, StringBuilder lpClassName, int nMaxCount);
public static bool EnumChildProc(int hwndChild, ref int lParam)
{
StringBuilder buf = new StringBuilder(128);
GetClassName(hwndChild, buf, 128);
if (buf.ToString() == "EXCEL7")
{
lParam = hwndChild;
return false;
}
return true;
}
}
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