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Summary

The CreateCaret API

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static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth,

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    Public Shared Function CreateCaret(ByVal hWnd As IntPtr, ByVal hBitmap As IntPtr, ByVal nWidth As Integer, ByVal nHeight As Integer) As Boolean

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Windows allows only one caret per message queue. To add a caret to a control, handle the WM_SETFOCUS message, or the GotFocus event, or override OnGotFocus if you're writing a custom control, and call CreateCaret from the message or event handler. You should also handle WM_KILLFOCUS, LostFocus or OnLostFocus and call DestroyCaret. You will also need to call ShowCaret to make the caret visible, and SetCaretPos to set its position.

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        CreateCaret(textBox1.Handle, IntPtr.Zero, 0, textBox1.Height);

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    Public Shared Function CreateCaret(ByVal hWnd As IntPtr, ByVal hBitmap As IntPtr, ByVal nWidth As Integer, ByVal nHeight As Integer) As Boolean

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    CreateCaret(TextBox1.Handle, bmPtr, 2, 12)

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Documentation

[CreateCaret] on MSDN

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CreateCaret

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CreateCaret(listBox1.Handle,mybitmap.GetHbitmap(), 1, listBox1.Height);