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    <p>The <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms645616%28v=vs.85%29.aspx" rel="nofollow">documentation for <code>WM_MOUSEMOVE</code></a> clearly states:</p> <blockquote> <p>Use the following code to obtain the horizontal and vertical position:</p> <pre><code>xPos = GET_X_LPARAM(lParam); yPos = GET_Y_LPARAM(lParam); </code></pre> <p>As noted above, the x-coordinate is in the low-order short of the return value; the y-coordinate is in the high-order short (both represent signed values because they can take negative values on systems with multiple monitors). If the return value is assigned to a variable, you can use the MAKEPOINTS macro to obtain a POINTS structure from the return value. You can also use the GET_X_LPARAM or GET_Y_LPARAM macro to extract the x- or y-coordinate. </p> <p><strong>Important</strong> Do not use the LOWORD or HIWORD macros to extract the x- and y- coordinates of the cursor position because these macros return incorrect results on systems with multiple monitors. Systems with multiple monitors can have negative x- and y- coordinates, and LOWORD and HIWORD treat the coordinates as unsigned quantities.</p> </blockquote> <p>Change this:</p> <pre><code>short nX; nX = (short)LOWORD(lParam); short nY; nY = (short)HIWORD(lParam); </code></pre> <p>To this:</p> <pre><code>short nX; nX = GET_X_LPARAM(lParam); short nY; nY = GET_Y_LPARAM(lParam); </code></pre> <p>Or this:</p> <pre><code>POINTS pt; pt = MAKEPOINTS(lParam); short nX; nX = pt.x; short nY; nY = pt.y; </code></pre> <p><strong>Update:</strong> something else to note from the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms645616%28v=vs.85%29.aspx" rel="nofollow">documentation</a>:</p> <blockquote> <p>Posted to a window when the cursor moves. If the mouse is not captured, the message is posted to the window that contains the cursor. Otherwise, the message is posted to the window that has captured the mouse.</p> </blockquote> <p>That means if the mouse has been captured via <code>SetCapture()</code>, the reported coordinates will be relative to the window that is doing the capturing, not the window that the mouse is actually moving over.</p>
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    1. USRemy Lebeau
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      1. VTUpMod
    1. COsorry，it doesn't work,I changed my code,but it still work like before.
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    2. COThen that is simply how Windows is actually reporting the coordinates. Which window is your `WM_MOUSEMOVE` handler actually attached to? The red dot in your screenshot is NOT located at 126x112 of the client area it is being drawn on, it is closer to 116x116 instead. 126x112 would make sense only if the `WM_MOUSEMOVE` message were being reported relative to the top-left corner of the main window, not the top-left corner of any client area inside of the window. `WM_MOUSEMOVE` is supposed to report coordinates that are relative to the client area of the window receiving the message.
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      1. USRemy Lebeau
    3. COThat suggests to me that your main window has captured the mouse, even though it is moving over a child window.
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