Zitat:
The SetCaretPos function moves the caret to the specified coordinates. If the window that owns the caret was created with the CS_OWNDC class style, then the specified coordinates are subject to the mapping mode of the device context associated with that window.
BOOL SetCaretPos(
int X, // horizontal position
int Y // vertical position
);
Parameters
X
Specifies the new x-coordinate of the caret.
Y
Specifies the new y-coordinate of the caret.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
SetCaretPos moves the caret whether or not the caret is hidden.
The caret is a shared resource; there is only one caret in the system. A window can set the caret position only if it owns the caret.