C# 根据进程获取程序主窗口句柄（包括最小化和隐藏程序）

来源：互联网发布：qq安全中心mac版编辑：程序博客网时间：2024/09/21 06:34

namespace Applications.UI
{
    class CurrentProcess
    {
            private static Hashtable processWnd = null;

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

            static CurrentProcess()
            {
                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 IntPtr GetCurrentWindowHandle(Process process)
            {
                IntPtr ptrWnd = IntPtr.Zero;
                uint uiPid = (uint)process.Id; // 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;
            }
        }

}