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POSubclassing Button Control within a Class
 

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    <p>I created my own custom GUI button class for use in Windows Mobile apps. Realizing that I needed some finer control and to remove the double-click annoyance, I figured all I need to do is subclass it like I always have.</p> <p>But, being that I have encapsulated everything into a Class though, seems to have complicated the matter.</p> <p>Below is a snippet of what I want to do</p> <pre><code>// Graphic button class for Wizard(ing) dialogs. class CButtonUXnav { private: // Local subclasses of controls. WNDPROC wpOldButton; // Handle to the original callback. LRESULT CALLBACK Button_WndProc (HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam); </code></pre> <p>. . .</p> <pre><code>int CButtonUXnav::CreateButton (LPCTSTR lpButtonText, int x, int y, int iWidth, int iHeight, bool gradeL2R) { xLoc = x; yLoc = y; nWidth = iWidth; nHeight = iHeight; wcscpy (wszButtonText, lpButtonText); PaintButtonInternals (x, y, iWidth, iHeight, gradeL2R); hButton = CreateWindow (L"BUTTON", wszButtonText, WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON | BS_OWNERDRAW, xLoc, yLoc, nWidth, nHeight, hWndParent, IDbutn, hInstance, NULL); // Subclass // (to remove double-click annoyance.) wpOldButton = (WNDPROC)GetWindowLong (hButton, GWL_WNDPROC); if (wpOldButton == 0) return 1; // Insert our own callback. SetWindowLong (hButton, GWL_WNDPROC, (LONG)Button_WndProc); return 0; } </code></pre> <p>But I can't seem to escape resolving this error:</p> <blockquote> <p>error C2440: 'type cast' : cannot convert from 'LRESULT (__cdecl CButtonUXnav::* )(HWND,UINT,WPARAM,LPARAM)' to 'LONG'</p> </blockquote> <p>Your thoughts?</p>
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    1. USSebastian Dwornik
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