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POHow do I paint a child window with FillRect()?
 

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  1. POHow do I paint a child window with FillRect()?
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    <p>I have a main window which is created with the following styles<br> <code>WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU | WS_TABSTOP | WS_GROUP | WS_VISIBLE</code><br> and with ex-stles<br> <code>WS_EX_ACCEPTFILES | WS_EX_CONTROLPARENT | WS_EX_LEFT | WS_EX_LTRREADING</code>.</p> <p>This main window has a child window on it, which is an edit control created with styles<br> <code>WS_VISIBLE | WS_CHILD | ES_READONLY</code><br> and ex-style<br> <code>WS_EX_CLIENTEDGE</code>.</p> <p>I am going to use this edit control as a progress-bar control. I don't want to use standard Wind32 progress-bar control (<code>PROGRESS_CLASS</code>), because I want to do a some custom painting on it (e.g.; dynamically changing fill color, displaying text on it, etc).</p> <p>I can paint any region of the main window by the following code:</p> <pre><code>// hWnd: Handle of the main window case WM_PAINT: hDc = BeginPaint(hWnd, &amp;Ps); Rect = AFunctionToGetCornerThePointsOfTheEditControl(); Rect.right = Rect.left + 3 * (Rect.right - Rect.left) / 4; // Fill 3/4 (75%) of it Rect.left -= 10; // Enlarge the paint region a little Rect.top -= 10; // so that we can see it if it stays Rect.bottom += 10; // under the edit control. hBrush = CreateSolidBrush(RGB(50,100,255)); ret = FillRect(hDc, &amp;Rect, hBrush); // ret = 1 always ler = GetLastError(); // ler = 0 EndPaint(hWnd, &amp;Ps); break; </code></pre> <p>It looks like this:<br> <img src="https://i.stack.imgur.com/sZyPa.png" alt="appearance of the painted window"></p> <p>I changed this code a little to paint the child control instead:</p> <pre><code>// hWndEdit: Handle of the edit control case WM_PAINT: hDc = BeginPaint(hWndEdit, &amp;Ps); Rect = AFunctionToGetCornerThePointsOfTheEditControl(); Rect.right = Rect.left + 3 * (Rect.right - Rect.left) / 4; // Fill 3/4 (75%) of it Rect.left -= 10; Rect.top -= 10; Rect.bottom += 10; hBrush = CreateSolidBrush(RGB(50,100,255)); ret = FillRect(hDc, &amp;Rect, hBrush); // ret = 0 always ler = GetLastError(); // ler = 6 (ERROR_INVALID_HANDLE) EndPaint(hWndEdit, &amp;Ps); break; </code></pre> <p>This time it doesn't work. The main windows completely disappears as soon as I drag some part it out of the screen area, and it becomes totally unresponsive. Desktop icons under it are visible, but are not clickable.</p> <p>So, what do I have to do in order to paint the child window (the edit control)?</p>
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    1. COThe proper way to do custom painting is to subclass it.
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