这似乎是 Office 产品处理数据的方式中的一个错误。WM_DPICHANGED https://msdn.microsoft.com/en-us/library/windows/desktop/dn312083%28v=vs.85%29.aspx信息。应用程序应该枚举其所有子窗口并重新缩放它们以响应消息,但不知何故无法正确处理加载项窗格。
您可以通过禁用 DPI 缩放来解决该错误。你说你尝试调用SetProcessDpiAwareness
,但一旦为应用程序设置了 DPI 感知,该功能就会失败,并且您正在使用的应用程序显然已经设置了它,因为它适用于父窗口。然后你应该做的是调用SetThreadDpiAwarenessContext https://msdn.microsoft.com/en-us/library/windows/desktop/mt748629%28v=vs.85%29.aspx, 像这个 C# 包装器 https://github.com/shawnmcdowell/Office-Extensibility-Samples/blob/e52661e0e627b97945ab16a3ecd1292e7af055d2/VSTOSharedAddin/VSTOSharedAddin/UserControlWinForm.cs#L87。不幸的是,我没有 Win10 multimon 设置来自己测试这一点,但这应该在应用程序运行时起作用。尝试这个插件 https://github.com/shawnmcdowell/Office-Extensibility-Samples/tree/e52661e0e627b97945ab16a3ecd1292e7af055d2/VSTOSharedAddin/VSTOSharedAddin,它有一个按钮可以设置线程 DPI 感知上下文,看看这是否适合您。
应用程序挂钩方法
Since SetThreadDpiAwarenessContext
可能在您的系统上不可用,处理该问题的一种方法是使主窗口忽略WM_DPICHANGED
信息。这可以通过安装应用程序挂钩来更改消息或通过子类化窗口来完成。应用程序挂钩是一种稍微简单一些的方法,陷阱也较少。基本上这个想法是拦截主应用程序的GetMessage
and change WM_DPICHANGED to WM_NULL https://stackoverflow.com/a/42773037/4454124,这将使应用程序丢弃该消息。缺点是这种方法仅适用于已发布的消息,但是WM_DPICHANGED
应该是其中之一。
因此,要安装应用程序挂钩,您的加载项代码将类似于:
public partial class ThisAddIn
{
public enum HookType : int
{
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
WH_KEYBOARD = 2,
WH_GETMESSAGE = 3,
WH_CALLWNDPROC = 4,
WH_CBT = 5,
WH_SYSMSGFILTER = 6,
WH_MOUSE = 7,
WH_HARDWARE = 8,
WH_DEBUG = 9,
WH_SHELL = 10,
WH_FOREGROUNDIDLE = 11,
WH_CALLWNDPROCRET = 12,
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14
}
delegate IntPtr HookProc(int code, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr SetWindowsHookEx(HookType hookType, HookProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll")]
static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
}
public struct MSG
{
public IntPtr hwnd;
public uint message;
public IntPtr wParam;
public IntPtr lParam;
public uint time;
public POINT pt;
}
HookProc cbGetMessage = null;
private UserControl1 myUserControl1;
private Microsoft.Office.Tools.CustomTaskPane myCustomTaskPane;
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
this.cbGetMessage = new HookProc(this.MyGetMessageCb);
SetWindowsHookEx(HookType.WH_GETMESSAGE, this.cbGetMessage, IntPtr.Zero, (uint)AppDomain.GetCurrentThreadId());
myUserControl1 = new UserControl1();
myCustomTaskPane = this.CustomTaskPanes.Add(myUserControl1, "My Task Pane");
myCustomTaskPane.Visible = true;
}
private IntPtr MyGetMessageCb(int code, IntPtr wParam, IntPtr lParam)
{
unsafe
{
MSG* msg = (MSG*)lParam;
if (msg->message == 0x02E0)
msg->message = 0;
}
return CallNextHookEx(IntPtr.Zero, code, wParam, lParam);
}
private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
{
}
#region VSTO generated code
private void InternalStartup()
{
this.Startup += new System.EventHandler(ThisAddIn_Startup);
this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
}
#endregion
}
请注意,这很大程度上是未经测试的代码,如果它可以阻止WM_DPICHANGED
您可能必须确保在应用程序退出之前删除挂钩来清理消息。
子类化方法
如果您想要阻止的消息没有发布到窗口,而是发送,则应用程序挂钩方法将不起作用,并且主窗口必须被相反,子类化 https://msdn.microsoft.com/en-us/library/windows/desktop/bb773183%28v=vs.85%29.aspx。这次我们将把代码放在用户控件中,因为主窗口需要在调用之前完全初始化SetWindowLong
.
因此,为了子类化 Power Point 窗口,我们的用户控件(位于插件内)看起来像这样(请注意,我为此使用 OnPaint,但您可以使用任何内容,只要保证窗口在调用SetWindowLong
):
public partial class UserControl1 : UserControl
{
const int GWLP_WNDPROC = -4;
[DllImport("user32", SetLastError = true)]
extern static IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);
[DllImport("user32", SetLastError = true)]
extern static IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr lpNewLong);
[DllImport("user32", SetLastError = true)]
extern static IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr lpNewLong);
delegate IntPtr WindowProc(IntPtr hwnd, uint uMsg, IntPtr wParam, IntPtr lParam);
private IntPtr origProc = IntPtr.Zero;
private WindowProc wpDelegate = null;
public UserControl1()
{
InitializeComponent();
this.Paint += UserControl1_Paint;
}
void UserControl1_Paint(object sender, PaintEventArgs e)
{
if (origProc == IntPtr.Zero)
{
//Subclassing
this.wpDelegate = new WindowProc(MyWndProc);
Process process = Process.GetCurrentProcess();
IntPtr wpDelegatePtr = Marshal.GetFunctionPointerForDelegate(wpDelegate);
if (IntPtr.Size == 8)
{
origProc = SetWindowLongPtr(process.MainWindowHandle, GWLP_WNDPROC, wpDelegatePtr);
}
else
{
origProc = SetWindowLong(process.MainWindowHandle, GWLP_WNDPROC, wpDelegatePtr);
}
}
}
//Subclassing
private IntPtr MyWndProc(IntPtr hwnd, uint uMsg, IntPtr wParam, IntPtr lParam)
{
if (uMsg == 0x02E0) //WM_DPICHANGED
return IntPtr.Zero;
IntPtr retVal = CallWindowProc(origProc, hwnd, uMsg, wParam, lParam);
return retVal;
}
}