Question

我正在尝试使用名为CFindWnd的类。不幸的是，它是用C语言编写的，我不知道如何将其翻译成C＃（或我所知道的任何其他语言）。因为它不是一个非常大的课程，我希望找到一个愿意为我翻译它的乐于助人的灵魂。

////////////////////////////////////////////////////////////////
// MSDN Magazine -- August 2003
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio .NET on Windows XP. Tab size=3.
//
// ---
// This class encapsulates the process of finding a window with a given class name
// as a descendant of a given window. To use it, instantiate like so:
//
//        CFindWnd fw(hwndParent,classname);
//
// fw.m_hWnd will be the HWND of the desired window, if found.
//
class CFindWnd {
private:
    //////////////////
    // This private function is used with EnumChildWindows to find the child
    // with a given class name. Returns FALSE if found (to stop enumerating).
    //
    static BOOL CALLBACK FindChildClassHwnd(HWND hwndParent, LPARAM lParam) {
        CFindWnd *pfw = (CFindWnd*)lParam;
        HWND hwnd = FindWindowEx(hwndParent, NULL, pfw->m_classname, NULL);
        if (hwnd) {
            pfw->m_hWnd = hwnd;    // found: save it

            return FALSE;            // stop enumerating

        }
        EnumChildWindows(hwndParent, FindChildClassHwnd, lParam); // recurse

        return TRUE;                // keep looking
    }

public:
    LPCSTR m_classname;            // class name to look for

    HWND m_hWnd;                    // HWND if found

    // ctor does the work--just instantiate and go

    CFindWnd(HWND hwndParent, LPCSTR classname)
        : m_hWnd(NULL), m_classname(classname)
    {
        FindChildClassHwnd(hwndParent, (LPARAM)this);
    }
};

编辑：我想出了以下内容。但是我仍然无法从对象转换为IntPtr，反之亦然。

class CFindWnd
{
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);

    public delegate bool Win32Callback(IntPtr hwnd, IntPtr lParam);
    [DllImport("user32.Dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool EnumChildWindows(IntPtr parentHandle, Win32Callback callback, IntPtr lParam);


    private static bool FindChildClassHwnd(IntPtr hwndParent, IntPtr lParam)
    {
        CFindWnd pfw = lParam as CFindWnd; //??? Error: can not be converted
        IntPtr hwnd = FindWindowEx(hwndParent, IntPtr.Zero, pfw.m_classname, IntPtr.Zero);
        if (!hwnd.Equals(IntPtr.Zero)) //??? not sure if that is correct
        {
            pfw.m_hWnd = hwnd;    // found: save it
            return false;            // stop enumerating
        }
        EnumChildWindows(hwndParent, FindChildClassHwnd, lParam); // recurse
        return true;                // keep looking
    }


    public string m_classname;            // class name to look for
    public IntPtr m_hWnd;                    // HWND if found


    // ctor does the work--just instantiate and go
    public CFindWnd(IntPtr hwndParent, string classname)
    {
        m_hWnd = IntPtr.Zero;
        m_classname = classname;
        FindChildClassHwnd(hwndParent, this); //??? conversion error
    }
}

Answer 1

您将不得不使用pInvoke在C＃中使用Win32方法

查看http://www.pinvoke.net/default.aspx/user32.findwindowex，了解如何使用pInvoke

来使用FindWindowEx

Answer 2

我已经解决了。解决方案不是一个直接的翻译，因为原来似乎有点过于迂回。用法：调用静态方法 handle = CFindWnd.FindHandle（parentHandle，classname）以获取作为 parentHandle 后代的窗口的句柄，其名称为类名。示例：假设您有一个webbrowser控件并希望直接操作底层的 Internet Explorer_Server ，您可以使用 CFindWnd.FindHandle（webbrowser.Handle，“Internet Explorer_Server”）来获取它的处理。

class CFindWnd
{
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);

    public delegate bool Win32Callback(IntPtr hwnd, IntPtr lParam);
    [DllImport("user32.Dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool EnumChildWindows(IntPtr parentHandle, Win32Callback callback, IntPtr lParam);


    static private bool FindChildClassHwnd(IntPtr parentHandle, IntPtr lParam)
    {
        IntPtr hwnd = FindWindowEx(parentHandle, IntPtr.Zero, _classname, IntPtr.Zero);
        if (!hwnd.Equals(IntPtr.Zero))
        {
            _handle = hwnd;           // found: save it
            return false;            // stop enumerating
        }
        EnumChildWindows(parentHandle, FindChildClassHwnd, lParam); // recurse
        return true;                 // keep looking
    }

    static private string _classname;              // class name to look for
    static private IntPtr _handle;                 // HWND if found

    static public IntPtr FindHandle(IntPtr parentHandle, string classname)
    {
        _handle = IntPtr.Zero;
        _classname = classname;
        FindChildClassHwnd(parentHandle, IntPtr.Zero);
        return _handle;
    }
}

Answer 3

您可以尝试使用FindWindow和FindWindowEx

Answer 4

您无法使用.NET中的C ++类。

将功能公开为C dllexports。

将CFindWnd翻译成C＃

4 个答案: