add hotkey code to main thread

windows-snapshot-tool/src/main.cpp

@@ -85,9 +85,16 @@ int WINAPI WinMain (HINSTANCE hThisInstance,
     /* Make the window visible on the screen */
     ShowWindow (Hwnd, nCmdShow);
 
+    minimize();
+
     /* Run the message loop. It will run until GetMessage() returns 0 */
     while (GetMessage (&messages, NULL, 0, 0))
     {
+        if (messages.message == WM_HOTKEY)
+        {
+            doScreenshot();
+        }
+
         /* Translate virtual-key messages into character messages */
         TranslateMessage(&messages);
         /* Send message to WindowProcedure */
@@ -213,6 +220,9 @@ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM
 
     case WM_DESTROY:
 
+        // quit the application.
+        Shell_NotifyIcon(NIM_DELETE, &notifyIconData);
+        UnregisterHotKey(Hwnd, WM_HOTKEY_FREEZE);
         PostQuitMessage (0);
         break;