cytown的方法是对的。
不过要注意：
Whenever your application redraws a screen while processing a message
other than WM_PAINT, it must make the caret invisible by using the
HideCaret function. When your application is finished drawing,
redisplay the caret by using the ShowCaret function. If your
application processes the WM_PAINT message, it is not necessary to
hide and redisplay the caret, because this function does this
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
automatically.
~~~~~~~~~~~~~~
The following code sample shows how to have your application hide the
caret while drawing a character on the screen and while processing
the WM_CHAR message.
HWND hwnd, // window handle
HDC hdc; // device context
case WM_CHAR:
switch (wParam)
{
case 0x08:
.
. // Process a backspace.
.
break;
case 0x09:
.
. // Process a tab.
.
break;
case 0x0D:
.
. // Process a carriage return.
.
break;
case 0x1B:
.
. // Process an escape.
.
break;
case 0x0A:
.
. // Process a linefeed.
.
break;
default:
// Hide the caret.
HideCaret(hwnd);
// Draw the character on the screen.
hdc = GetDC(hwnd);
SelectObject(hdc,
GetStockObject(SYSTEM_FIXED_FONT));
TextOut(hdc, x, y, lpszChar, 1);
ReleaseDC(hwnd, hdc);
// Display the caret.
ShowCaret(hwnd);
}
If your application calls the HideCaret function several times
without calling ShowCaret, the caret will not be displayed until the
application also calls ShowCaret the same number of times.
