Question

所以这就是我需要做的事情

有一个程序连接到某个服务器并以大约每秒15-20个条目的速度从中获取数据

在建立与服务器的连接时，就会打开一个Excel窗口，并且从服务器获取的所有条目都会动态移动到该Excel表中

然而，所有内容都保留在RAM中，即Excel文件本身仅在我们尝试关闭该Excel窗口并且出现“另存为...”对话框时才会创建

正如您可能已经理解的那样，我不想每次都手动保存文件，因此我需要一些方法以编程方式将Excel表格保存在打开的窗口中，保存到文件中

有没有办法做到这一点？

Answer 1

如果您没有在服务器上运行此操作，并且您不介意手动触发Excel保存，那么您可以使用Interop创建将连接到Excel实例的内容。以下内容将连接到Excel实例并返回指定工作簿名称的Excel.Workbook对象：

private Excel.Workbook GetWorkbook(string workbookName)
{
    Excel.Window window = null;      // Excel window object from which application is grabbed
    Excel.Application app = null;    // Excel instance from which we get all the open workbooks
    Excel.Workbooks wbs = null;      // List of workbooks
    Excel.Workbook wb = null;        // Workbook to return
    EnumChildCallback cb;            // Callback routine for child window enumeration routine
    List<Process> procs = new List<Process>();           // List of processes

    // Get a full list of all processes that have a name of "excel"

    procs.AddRange(Process.GetProcessesByName("excel"));

    foreach (Process proc in procs)
    {
        // Make sure we have a valid handle for the window

        if ((int)proc.MainWindowHandle > 0)
        {
            // Get the handle of the child window in the current Excel process

            int childWindow = 0;
            cb = new EnumChildCallback(EnumChildProc);
            EnumChildWindows((int)proc.MainWindowHandle, cb, ref childWindow);

            // Make sure we got a valid handle

            if (childWindow > 0)
            {
                // Get the address of the child window so that we can talk to it and
                // get all the workbooks

                const uint OBJID_NATIVEOM = 0xFFFFFFF0;
                Guid IID_IDispatch =
                    new Guid("{00020400-0000-0000-C000-000000000046}");
                int res = AccessibleObjectFromWindow(childWindow, OBJID_NATIVEOM,
                    IID_IDispatch.ToByteArray(), ref window);

                if (res >= 0)
                {
                    app = window.Application;
                    wbs = app.Workbooks;

                    // Loop through all the workbooks within the current Excel window
                    // to see if any match

                    for (int i = 1; i <= wbs.Count; i++)
                    {
                        wb = wbs[i];

                        if (wb.Name == workbookName)
                        {
                            break;
                        }

                        wb = null;
                    }
                }
            }
        }

        // If we've already found our workbook then there's no point in continuing
        // through the remaining processes

        if (wb != null)
        {
            break;
        }
    }

    Release(wbs);
    Release(app);
    Release(window);

    return wb;
}

上面调用的Release()方法只是将引用设置为null并在它们上面调用Marshal.FinalReleaseComObject()，否则最终会出现无处不在的Excel实例。

您还需要以下内容来执行一些抓取窗口的功能：

private delegate bool EnumChildCallback(int hwnd, ref int lParam);

[DllImport("User32.dll")]
private static extern bool EnumChildWindows(int hWndParent, EnumChildCallback lpEnumFunc, ref int lParam);

[DllImport("Oleacc.dll")]
private static extern int AccessibleObjectFromWindow(int hwnd, uint dwObjectID, byte[] riid, ref Excel.Window ptr);

private bool EnumChildProc(int hwndChild, ref int lParam)
{
    // Get the name of the class that owns the passed-in window handle

    StringBuilder buf = new StringBuilder(128);
    GetClassName(hwndChild, buf, 128);

    // If the class name is EXCEL7 then we've got an valid Excel window

    if (buf.ToString() == "EXCEL7")
    {
        lParam = hwndChild;
        return false;
    }

    return true;
}

[DllImport("User32.dll")]
private static extern int GetClassName(int hWnd, StringBuilder lpClassName, int nMaxCount);

获得工作簿后，您可以致电Workbook.SaveAs()进行保存。

以编程方式将打开的窗口中的Excel表保存到文件中

1 个答案: