112 {

113 HWND hWnd;

114

115 hInst = hInstance; // Store instance handle in our global variable

116

117 hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,

118 CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

119

120 if (!hWnd)

121 {

122 return FALSE;

123 }

124

125 ShowWindow(hWnd, nCmdShow);

126 UpdateWindow(hWnd);

127

128 return TRUE;

129 }

130

131 //

132 // FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)

133 //

134 // PURPOSE: Processes messages for the main window.

135 //

136 // WM_COMMAND - process the application menu

137 // WM_PAINT - Paint the main window

138 // WM_DESTROY - post a quit message and return

139 //

140 //

141 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

142 {

143 int wmId, wmEvent;

144 PAINTSTRUCT ps;

145 HDC hdc;

146

147 HRGN hTmp;

148 BOOL bChanged;

149 LRESULT result;

150

151 switch (message)

152 {

153 case WM_COMMAND:

154 wmId = LOWORD(wParam);

155 wmEvent = HIWORD(wParam);

156 // Parse the menu selections:

157 switch (wmId)

158 {

159 case IDM_ABOUT:

160 DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);

161 break;

162 case IDM_EXIT:

163 DestroyWindow(hWnd);

164 break;

165 default:

166 return DefWindowProc(hWnd, message, wParam, lParam);

167 }

168 break;

169 case WM_PAINT:

170 hdc = BeginPaint(hWnd, &ps);

171 // TODO: Add any drawing code here...

172 EndPaint(hWnd, &ps);

173 break;

174

175 case WM_NCPAINT:

176 hdc = GetWindowDC(hWnd);

177 PaintNC(hWnd, hdc);

178 ReleaseDC(hWnd, hdc);

179 break;

180

181 case WM_NCCALCSIZE:

182 ((LPNCCALCSIZE_PARAMS)lParam)->rgrc[0].left += 3;

183 ((LPNCCALCSIZE_PARAMS)lParam)->rgrc[0].top += 55;

184 ((LPNCCALCSIZE_PARAMS)lParam)->rgrc[0].right -= 4;

185 ((LPNCCALCSIZE_PARAMS)lParam)->rgrc[0].bottom -= 4;

186 break;

187

188 case WM_NCACTIVATE:

189 PostMessage(hWnd, WM_NCPAINT, 1, 0);

190 break;

191

192 case WM_WINDOWPOSCHANGING:

193 bChanged = FALSE;

194

195 if (!gChangeSizeCalled) {

196 bChanged = (((LPWINDOWPOS)lParam)->flags & SWP_FRAMECHANGED);

197

198 if ((((LPWINDOWPOS)lParam)->flags & SWP_NOMOVE) == 0){

199 gWindowSize.left = ((LPWINDOWPOS)lParam)->x;

200 gWindowSize.top = ((LPWINDOWPOS)lParam)->y;

201 }

202 if ((((LPWINDOWPOS)lParam)->flags & SWP_NOSIZE) == 0){

203 bChanged = bChanged || (((LPWINDOWPOS)lParam)->cx != gWindowSize.right) || (((LPWINDOWPOS)lParam)->cy != gWindowSize.bottom);

204 gWindowSize.right = ((LPWINDOWPOS)lParam)->cx;

205 gWindowSize.bottom = ((LPWINDOWPOS)lParam)->cy;

206 }

207

208 bChanged = bChanged && ((gWindowSize.right * gWindowSize.bottom) != 0);

209

210 if (bChanged)

211 {

212 gChangeSizeCalled = TRUE;

213 __try {

214 hTmp = gRegion;