如何以编程方式在IE上运行的网页中找到用户控件的句柄?
我能够使用Spy ++找到它,但由于手柄不断变化,我陷入困境。
我一直在尝试使用FindWindow(),但没有运气:(我也想知道我做错了什么,或者它只是适用于Windows ...
提前致谢,
朱波罗卡
答案 0 :(得分:1)
我在WPF中的IE控件中找到PDF ActiveX控件时遇到了类似的问题。
为了克服这个问题,我使用EnumChildWindows
API来查找正确的子窗口,从而得到它的句柄。
我将尽可能多地包含代码。
private static IntPtr FindPdfControlWindow(IntPtr parentHandle)
{
IntPtr result = IntPtr.Zero;
IntPtr matchPointer = IntPtr.Zero;
try
{
//allocate unmanaged memory for the result of the callback delegate
matchPointer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IntPtr)));
Marshal.WriteIntPtr(matchPointer, IntPtr.Zero)
//instantiate the delegate and pass to the API
NativeMethods.EnumWindowProc windowChecker = CheckForPdfControlWindow;
if (!NativeMethods.EnumChildWindows(parentHandle,
windowChecker,
matchPointer))
}
finally
{
if (matchPointer != IntPtr.Zero) Marshal.FreeHGlobal(matchPointer);
}
return result;
}
private static bool CheckForPdfControlWindow(IntPtr handle,
IntPtr matchPointer)
{
int captionLength = NativeMehtods.GetWindowTextLength(handle);
if (captionLength > 0)
{
StringBuilder buffer = new StringBuilder(captionLength + 1);
NativeMethods.GetWindowText(handle, buffer, buffer.Capacity);
if (buffer.ToString().Contains("Adobe"))
{
Marhsal.WriteIntPtr(matchPointer, handle)
return false;
}
}
return true;
}
private static class NativeMethods
{
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool EnumChildWindows(IntPtr window,
EnumWindowProc callback,
IntPtr i);
internal delegate bool EnumWindowProc(IntPtr hWnd, IntPtr parameter);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSer.Auto)]
internal static extern int GetWindowTextLength(IntPtr hWnd);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
internal static extern int GetWindowText(IntPtr hWnd,
StringBuilder lpString,
int nMaxCount);
}
匆忙转录,所以我希望它既有用又准确。
答案 1 :(得分:1)
如果ActiveX控件被窗口化,那么您可以查询其IOleWindow接口以获取窗口句柄。
在query interfaces from the ActiveX之前,您需要查看页面的HTML以找到识别文档中activex的方法,例如元素ID。