Retrieve Excel application from process id

问题

I am starting an Excel application using the Process class. I am able to get the process id & the main window handle with the code below.

  Process xlP = Process.Start("excel.exe");
  int id = xlP.Id;
  int hwnd = (int)Process.GetCurrentProcess().MainWindowHandle;

So this starts an Excel application. How do I reference this particular instance of Excel with the process id & main window handle?

I have seen similar questions on here but the answer was a link to a webpage that no longer exists.

I basically want something like below.

oExcelApp =  (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

Please not the Excel application has to be started using the Process.Start method, no if buts or maybes.

回答1:

You can use the following code to access all running Excel instances and display the Window Handle they use:

[DllImport("ole32.dll")]
private static extern int GetRunningObjectTable(int reserved, out IRunningObjectTable prot);

private void button1_Click(object sender, EventArgs e)
{
    IRunningObjectTable lRunningObjectTable = null;
    IEnumMoniker lMonikerList = null;

    try
    {
        // Query Running Object Table 
        if (GetRunningObjectTable(0, out lRunningObjectTable) != 0 || lRunningObjectTable == null)
        {
            return;
        }

        // List Monikers
        lRunningObjectTable.EnumRunning(out lMonikerList);

        // Start Enumeration
        lMonikerList.Reset();

        // Array used for enumerating Monikers
        IMoniker[] lMonikerContainer = new IMoniker[1];

        IntPtr lPointerFetchedMonikers = IntPtr.Zero;

        // foreach Moniker
        while (lMonikerList.Next(1, lMonikerContainer, lPointerFetchedMonikers) == 0)
        {
            object lComObject;
            lRunningObjectTable.GetObject(lMonikerContainer[0], out lComObject);

            // Check the object is an Excel workbook
            if (lComObject is Microsoft.Office.Interop.Excel.Workbook)
            {
                Microsoft.Office.Interop.Excel.Workbook lExcelWorkbook = (Microsoft.Office.Interop.Excel.Workbook)lComObject;
                // Show the Window Handle 
                MessageBox.Show("Found Excel Application with Window Handle " + lExcelWorkbook.Application.Hwnd);
            }
        }
    }
    finally
    {
        // Release ressources
        if (lRunningObjectTable != null) Marshal.ReleaseComObject(lRunningObjectTable);
        if (lMonikerList != null) Marshal.ReleaseComObject(lMonikerList);
    }
}

回答2:

Add a reference to Microsoft.Office.Interop.Excel and use the following code:

        Process xlP = Process.Start("excel.exe");
        int id = xlP.Id;
        int hwnd = (int)Process.GetCurrentProcess().MainWindowHandle;

        Excel.Application oExcelApp = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

        if(xlP.MainWindowTitle.Contains( oExcelApp.ActiveWorkbook.Name)   )
        {
            //Proceed further
        }

来源：https://stackoverflow.com/questions/35366658/retrieve-excel-application-from-process-id

标签

.net

excel-interop