Changeset 22115 for branches/swt/testapp/apitest/src/ApiTestWin.cpp

Timestamp:

Feb 9, 2016, 12:57:59 PM (10 years ago)

Author:

rousseau

Message:

Changed application termination [apitest]

Termination is now redirected to WM_CLOSE.
WM_CLOSE does a DestroyWindow(), which in turn generates a WM_DESTROY
message, which is where the main message-loop is ended by doing a call
to PostQuitMessage().

At exit however, the 'wParam' field of the 'msg' structure does not
contain the exit-code as provided with PostQuitMessage().

File:

• branches/swt/testapp/apitest/src/ApiTestWin.cpp (modified) (6 diffs)

branches/swt/testapp/apitest/src/ApiTestWin.cpp

@@ -95 +95 @@
                 /* Message from the button, we post a message to close the window */
                 case ID_EXIT:
-                    PostQuitMessage(0);
-                    break;
-
-                /* Exit Message from the File Menu, forward it to ID_EXIT */
+                    PostMessage(hwnd, WM_CLOSE, NULL, NULL);
+                    break;
+
+                /* Message from the button, we post a message to close the window */
                 case ID_FILE_EXIT:
-                    PostMessage(hwnd, WM_COMMAND, (UINT) ID_EXIT, NULL);
+                    PostMessage(hwnd, WM_CLOSE, NULL, NULL);
                     break;
 
@@ -132 +132 @@
 
         /*
-        // Request to quit the application.
+        // This message is generated by a call to PostQuitMessage() or the
+        // posting of a WM_QUIT message. It causes GetMessage() to return zero
+        // and thus the message-loop to end. So this message is never
+        // dispatched and this case thus never reached. After the message-loop
+        // ends, the message-structure contains this message with an exit-code
+        // (from PostQuitMessage()) in wParam.
         */
         case WM_QUIT:
@@ -140 +145 @@
 
         /*
-        // Request to close the application.
-        // On Win32 WM_CLOSE does a DestroyWindow() but does not post a WM_QUIT
-        // message and thus does not terminate the message-loop.
+        // This message is sent when the close-button is clicked.
+        // On Win32, DefWindowProc() does a DestroyWindow(), but does not post
+        // a WM_QUIT message and thus does not terminate the message-loop.
         */
         case WM_CLOSE:
             printf("WM_CLOSE received\n");
             lres = DefWindowProc(hwnd, msg, wparam, lparam);
-            PostQuitMessage(0);
-            break;
-
-        /*
-        // Window is being destroyed, time to cleanup resources allocated.
+            break;
+
+        /*
+        // This message is generated by a call to DestroyWindow().
+        // At the time this message is received, the windows and its children
+        // are not destroyed yet.
         */
         case WM_DESTROY:
             printf("WM_DESTROY received\n");
             lres = DefWindowProc(hwnd, msg, wparam, lparam);
+            PostQuitMessage(99);
             break;
 
@@ -266 +273 @@
     hwnd = CreateWindow(
         MainWndClass,                   // Our Window Class
-        "ApiTestWin :: Main Window [generated:201602071054]",   // Caption Text
+        "ApiTestWin :: Main Window [generated:201602071950]",   // Caption Text
         WS_OVERLAPPEDWINDOW,            // Window Stype
         100,                            // The x-pos from ulc
@@ -292 +299 @@
     }
 
+    /* Last Message Info */
+    printf("\n");
+    printf("Last Message:\n");
+    printf("msg.hwnd=%08X\n", msg.hwnd);
+    printf("msg.message=%08X (%d)\n", msg.message, msg.message);
+    printf("msg.wParam=%08X (%d)\n", msg.wParam, msg.wParam);
+    printf("msg.lParam=%08X (%d)\n", msg.lParam, msg.lParam);
+
     /* App is terminating */
+    printf("\n");
     printf("ApiTestWin is terminating...\n");
 
@@ -307 +323 @@
     printf("\n");
     printf("%s\n","###############################################################################");
-    printf("%s\n","# This is the Windows variant of ApiTest                 version.201602071054 #");
+    printf("%s\n","# This is the Windows variant of ApiTest                 version.201602071950 #");
     printf("%s\n","###############################################################################");
     printf("\n");