C#获取进程的主窗口句柄的实现方法

发布时间：2020-12-15 05:52:37 所属栏目：百科来源：网络整理

导读：通过调用Win32 API实现。复制代码代码如下: public class User32API { private static Hashtable processWnd = null; public delegate bool WNDENUMPROC(IntPtr hwnd,uint lParam); static User32API() { if (processWnd == null) { processWnd = new Hash

通过调用Win32 API实现。

复制代码代码如下:

public class User32API
{
private static Hashtable processWnd = null;

public delegate bool WNDENUMPROC(IntPtr hwnd,uint lParam);

    static User32API()
    {
        if (processWnd == null)
        {
            processWnd = new Hashtable();
        }
    }

[DllImport("user32.dll",EntryPoint = "EnumWindows",SetLastError = true)]
public static extern bool EnumWindows(WNDENUMPROC lpEnumFunc,uint lParam);

[DllImport("user32.dll",EntryPoint = "GetParent",SetLastError = true)]
public static extern IntPtr GetParent(IntPtr hWnd);

[DllImport("user32.dll",EntryPoint = "GetWindowThreadProcessId")]
public static extern uint GetWindowThreadProcessId(IntPtr hWnd,ref uint lpdwProcessId);

[DllImport("user32.dll",EntryPoint = "IsWindow")]
public static extern bool IsWindow(IntPtr hWnd);

[DllImport("kernel32.dll",EntryPoint = "SetLastError")]
public static extern void SetLastError(uint dwErrCode);

    public static IntPtr GetCurrentWindowHandle()
    {
        IntPtr ptrWnd = IntPtr.Zero;
        uint uiPid = (uint)Process.GetCurrentProcess().Id; // 当前进程 ID
        object objWnd = processWnd[uiPid];

        if (objWnd != null)
        {
            ptrWnd = (IntPtr)objWnd;
            if (ptrWnd != IntPtr.Zero && IsWindow(ptrWnd)) // 从缓存中获取句柄
            {
                return ptrWnd;
            }
            else
            {
                ptrWnd = IntPtr.Zero;
            }
        }

        bool bResult = EnumWindows(new WNDENUMPROC(EnumWindowsProc),uiPid);
        // 枚举窗口返回 false 并且没有错误号时表明获取成功
        if (!bResult && Marshal.GetLastWin32Error() == 0)
        {
            objWnd = processWnd[uiPid];
            if (objWnd != null)
            {
                ptrWnd = (IntPtr)objWnd;
            }
        }

return ptrWnd;
}

    private static bool EnumWindowsProc(IntPtr hwnd,uint lParam)
    {
        uint uiPid = 0;

        if (GetParent(hwnd) == IntPtr.Zero)
        {
            GetWindowThreadProcessId(hwnd,ref uiPid);
            if (uiPid == lParam)    // 找到进程对应的主窗口句柄
            {
                processWnd[uiPid] = hwnd;   // 把句柄缓存起来
                SetLastError(0);    // 设置无错误
                return false;   // 返回 false 以终止枚举窗口
            }
        }

return true;
}
}

调用User32API.GetCurrentWindowHandle()即可返回当前进程的主窗口句柄，如果获取失败则返回IntPtr.Zero。

--EOF--

（编辑：李大同）

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