c# - 桌面图标操作 - 如何在启用图片旋转主题时获取 SysListView32 的句柄

Question

我正在尝试在桌面上移动图标，一切正常，直到选择了具有图片旋转的主题。对于基本的 Windows 7 主题，SysListView32 是 SHELLDLL_DefView 的子项，后者又是 Progman 的子项。

But when a picture rotation desktop theme is picked, SysListView32 becomes child of SHELLDLL_DefView which in turn becomes child of WorkerW.不止 1 个。我应该如何找到指向正确 WorkerW 的正确 HWND。枚举所有桌面窗口并使用类名 WorkerW 检查每个窗口？

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, GetWindow_Cmd uCmd);
[DllImport("user32.DLL")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent,IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

enum GetWindow_Cmd : uint
{
    GW_HWNDFIRST = 0,
    GW_HWNDLAST = 1,
    GW_HWNDNEXT = 2,
    GW_HWNDPREV = 3,
    GW_OWNER = 4,
    GW_CHILD = 5,
    GW_ENABLEDPOPUP = 6
}

例如，在我的 main() 中，我进行了以下调用:

IntPtr HWND = FindWindow("Progman",null);
HWND = GetWindow(HWND, GetWindow_Cmd.GW_CHILD);
HWND = GetWindow(HWND, GetWindow_Cmd.GW_CHILD);

Answer 1

非常感谢 Hans 在他的机器上尝试这个，也感谢 Sertac 告诉我 SysListView32 将父类从“Progman”更改为“WorkerW”类名。我的解决方案是首先尝试在 Progman 的 child 中找到 SysListView32:

       hwndIcon = NativeMethods.FindWindow("Progman", null);
       hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SHELLDLL_DefView", null);
       hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SysListView32", "FolderView");

如果 hwndIcon 返回 IntPtr.Zero，我尝试枚举桌面下的所有窗口，然后找到类名为“WorkerW”的窗口(我在委托(delegate) GetSysListViewContainer(...) 中执行此操作)在后者中，我发现“The一个而且只有一个”，即。那个有 child 的。那就是包含SHELLDLL_DefView的那个，它本身包含SysListView32，它本身包含桌面上每个Icon的句柄:

       hwndIcon = NativeMethods.FindWindow("Progman", null);
       hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SHELLDLL_DefView", null);
       hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SysListView32", "FolderView");

       if (hwndIcon == IntPtr.Zero)
        {
            IntPtr hDesktop = NativeMethods.GetDesktopWindow();
            IntPtr hwnd = IntPtr.Zero;
            EnumWindowsProc ewp = new EnumWindowsProc(GetSysListViewContainer);
            EnumWindows(ewp, 0);
            hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SHELLDLL_DefView", null);
            hwndIcon = NativeMethods.FindWindowEx(hwndIcon, IntPtr.Zero, "SysListView32", "FolderView");
        }

通过以下我得到桌面图标数:

       int vItemCount = NativeMethods.SendMessage(hwndIcon, LVM_GETITEMCOUNT, 0, 0);
       string vText;
       int vProcessId = 0;

然后我循环遍历所有图标:

        NativeMethods.GetWindowThreadProcessId(hwndIcon, ref vProcessId);
        IntPtr vProcess = NativeMethods.OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_READ | PROCESS_VM_WRITE, false, vProcessId);
        IntPtr foo = IntPtr.Zero;
        IntPtr vPointer = NativeMethods.VirtualAllocEx(vProcess, IntPtr.Zero, sizeof(uint), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);

            for (int j = 0; j < vItemCount; j++)
            {
                byte[] vBuffer = new byte[256];
                LVITEM[] vItem = new LVITEM[1];
                vItem[0].mask = LVIF_TEXT;
                vItem[0].iItem = j;
                vItem[0].iSubItem = 0;
                vItem[0].cchTextMax = vBuffer.Length;
                vItem[0].pszText = (IntPtr)((int)vPointer + Marshal.SizeOf(typeof(LVITEM)));
                uint vNumberOfBytesRead = 0;
                WriteProcessMemory(vProcess, vPointer, Marshal.UnsafeAddrOfPinnedArrayElement(vItem, 0), Marshal.SizeOf(typeof(LVITEM)), ref vNumberOfBytesRead);
                SendMessage(hwndIcon, LVM_GETITEMW, j, vPointer.ToInt32());
                ReadProcessMemory(vProcess, (IntPtr)((int)vPointer + Marshal.SizeOf(typeof(LVITEM))), Marshal.UnsafeAddrOfPinnedArrayElement(vBuffer, 0), vBuffer.Length, out vNumberOfBytesRead);

                // Get the name of the Icon
                vText = Encoding.Unicode.GetString(vBuffer, 0, (int)vNumberOfBytesRead);

                // Get  Icon location
                SendMessage(hwndIcon, LVM_GETITEMPOSITION, j, vPointer.ToInt32());
                Point[] vPoint = new Point[1];
                foo = Marshal.UnsafeAddrOfPinnedArrayElement(vPoint, 0);
                ReadProcessMemory(vProcess, vPointer, Marshal.UnsafeAddrOfPinnedArrayElement(vPoint, 0), Marshal.SizeOf(typeof(Point)), out vNumberOfBytesRead);

               //and ultimaely move icon.
               SendMessage(hwndIcon, LVM_SETITEMPOSITION, j, lParam[0]);

总而言之，我需要弄清楚为什么我无法获得所有桌面图标都存储在 Windows 中的 ListView 容器的句柄。我的原代码在没有背景旋转的情况下运行良好，但在有背景旋转的情况下无法获取ListSysView32的句柄。

有没有更好的方法从 .Net 做到这一点？jj