c# - 如果所有者 hwnd、窗口的类名和大小已知，则获取窗口 hwnd

Question

我需要一些具体的帮助。我知道类名、所有者 hwnd 和窗口大小。我如何获得它的 hwnd？或者，至少，获取满足这些条件的所有窗口的列表。

提前致谢！

瓦利

Answer 1

您可以尝试使用此代码。它将为您提供每个具有特定类名的顶级窗口的 IntPtr（窗口句柄）：

/// <summary>
/// Returns a sequence of window handles (IntPtrs) for all top-level windows
/// matching the specfied window class name.
/// </summary>
/// <param name="className">The windows class name to match (not to be confused with a C# class name!)</param>
/// <returns>A non-null sequence of window handles. This will be an empty sequence if no windows match the class name.</returns>

public static IEnumerable<IntPtr> WindowsMatchingClassName(string className)
{
    if (string.IsNullOrWhiteSpace(className))
    {
        throw new ArgumentOutOfRangeException("className", className, "className can't be null or blank.");
    }

    return WindowsByClassFinder.WindowsMatching(className);
}

/// <summary>Finds windows matching a particular window class name.</summary>

private class WindowsByClassFinder
{
    /// <summary>Find the windows matching the specified class name.</summary>

    public static IEnumerable<IntPtr> WindowsMatching(string className)
    {
        return new WindowsByClassFinder(className)._result;
    }

    private WindowsByClassFinder(string className)
    {
        _className = className;
        EnumWindows(callback, IntPtr.Zero);
    }

    private bool callback(IntPtr hWnd, IntPtr lparam)
    {
        if (GetClassName(hWnd, _apiResult, _apiResult.Capacity) != 0)
        {
            if (string.CompareOrdinal(_apiResult.ToString(), _className) == 0)
            {
                _result.Add(hWnd);
            }
        }

        return true; // Keep enumerating.
    }

    [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage"), SuppressUnmanagedCodeSecurity]
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private extern static bool EnumWindows(EnumWindowsDelegate lpEnumFunc, IntPtr lparam);

    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    private static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

    private delegate bool EnumWindowsDelegate(IntPtr hWnd, IntPtr lparam);

    private readonly string _className;
    private readonly List<IntPtr> _result = new List<IntPtr>();
    private readonly StringBuilder _apiResult = new StringBuilder(1024);
}