winforms - 防止只读的RichTextBox闪烁光标(IBeam)

Question

无论如何，只要文本框获得焦点，是否可以防止只读RichRextBox的光标(IBeam)闪烁？

我试图阻止WM_SETFOCUS中的WndProc消息，但它导致表单挂起。

if( m.Msg == 0x0007 ) return;

Answer 1

您将需要使用Win32 API。这是您可以在VB中执行的操作:

'API declares
Private Declare Function HideCaret Lib "user32" _
(ByVal hwnd As IntPtr) As Integer
Private Declare Function ShowCaret Lib "user32" _
(ByVal hwnd As IntPtr) As Integer
'hide the caret in myTextBox
Call HideCaret(myTextBox.Handle)
'show the caret back..
Call ShowCaret(myTextBox.Handle)

和在C#中

 [DllImport("user32.dll", EntryPoint = "ShowCaret")]
 public static extern long ShowCaret(IntPtr hwnd);
 [DllImport("user32.dll", EntryPoint = "HideCaret")]
 public static extern long HideCaret(IntPtr hwnd);

然后调用

   HideCaret(richtextbox.Handle)

每当您想隐藏它时。