C#遍历进程获取主窗口句柄

C#遍历进程获取主窗口句柄

当我们启动一个程序，用 Process process = Process.Start(path);//path是程序的绝对路径

启动时，获取的process.Handle其实是进程的句柄，并不是窗口的句柄，而有时process.MainWindowHandle却等于0

此时就需要用枚举来获取启动进程的主窗口句柄了，代码如下：

/// <summary>
    /// 用于枚举子窗体是的委托
    /// </summary>
    /// <param name="WindowHandle">窗体句柄</param>
    /// <param name="num">自定义</param>
    /// <returns></returns>
    public delegate bool EnumChildWindow(IntPtr WindowHandle, string num);
    /// <summary>
    /// 获取指定窗体的所有子窗体
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="ec">回调委托</param>
    /// <param name="name">自定义</param>
    /// <returns></returns>
    [DllImport("User32.dll")]
    public static extern int EnumChildWindows(IntPtr WinHandle, EnumChildWindow ecw, string name);
    /// <summary>
    /// 获取指定窗体的标题
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="Title">缓冲区取用于存储标题</param>
    /// <param name="size">缓冲区大小</param>
    /// <returns></returns>
    [DllImport("User32.dll")]
    public static extern int GetWindowText(IntPtr WinHandle, StringBuilder Title, int size);
    /// <summary>
    /// 获取窗体类型
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="Type">类型</param>
    /// <param name="size">缓冲区大小</param>
    /// <returns></returns>
    [DllImport("user32.dll")]
    public static extern int GetClassName(IntPtr WinHandle, StringBuilder Type, int size);
 
    /// <summary>
    /// 根据句柄获得进程id值
    /// </summary>
    /// <param name="handle">句柄</param>
    /// <param name="pid"></param>
    /// <returns></returns>
    [DllImport("user32")]
    private static extern int GetWindowThreadProcessId(IntPtr handle, out int pid);
 IntPtr mainHwnd = IntPtr.Zero;//登录窗口句柄
string typeName = string.Empty;//启动程序的窗口标题
 
   /// <summary>
    /// 枚举窗体
    /// </summary>
    /// <param name="handle"></param>
    /// <param name="num"></param>
    /// <returns></returns>
    private bool EnumChild(IntPtr handle, string num)
    {
        StringBuilder title = new StringBuilder();
        //StringBuilder type = new StringBuilder();
        title.Length = 100;
        //type.Length = 100;
 
        GetWindowText(handle, title, 100);//取标题
        //GetClassName(handle, type, 100);//取类型
 
        if (title.ToString() == typeName)
        {
            mainHwnd = handle;
            return false;
        }
        return true;
    }
 
 
//代码调用
pubilc boolTest()
{
       FileVersionInfo myFileVersion = FileVersionInfo.GetVersionInfo(path);
        typeName = myFileVersion.ProductName;//获取程序产品名称
int waitTime = 0;
     while (true)
            {
                
                EnumChildWindow ecw = new EnumChildWindow(EnumChild);
                EnumChildWindows(mainWindowHandle, ecw, "");
 
                GetWindowRect(mainHwnd.ToInt32(), ref rectMain);
                int pid = 0;
                GetWindowThreadProcessId(mainHwnd, out pid);
                //rectMain.Height - rectMain.Y < 300说明是登录窗口
                if (mainHwnd != IntPtr.Zero && process.Id == pid && rectMain.Height - rectMain.Y < 300)//276                
                    break;
                waitTime++;
                //30秒没打开程序，登录失败
                if (waitTime >= 30)
                    return false;
                Thread.Sleep(1000);
            }
return true;
}
           

=========================================================================

另外一个参考：

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。

转自http://www.cnblogs.com/slyzly/articles/2331487.html