Wait for mouse button press (outside of callback)

[np_123]

I create a window and the below code is the callback for it.
What I'm looking for is a way to wait for those events to happen, using the callback essentially as a trigger. But doing something like toggling a boolean variable and having a loop waiting for it would cause the UI to hang as it's event-driven. Any suggestions?

C:

LRESULT CALLBACK WndProc(       HWND   hWnd,                  // Handle For This Window                                                         UINT    uMsg,                     // Message For This Window                                                         WPARAM  wParam,         // Additional Message Information                                                         LPARAM  lParam)         // Additional Message Information {         switch (uMsg) {         case (WM_LBUTTONDOWN | WM_RBUTTONDOWN): // | WM_LBUTTONUP | WM_RBUTTONUP):                 Cursor.X = GET_X_LPARAM(lParam);                 Cursor.Y = GET_Y_LPARAM(lParam);                 Cursor.buttonmask = wParam;                 break;         case WM_MOUSEMOVE:                 Cursor.X = GET_X_LPARAM(lParam);                 Cursor.Y = GET_Y_LPARAM(lParam);                                break;         case WM_CLOSE:                 MIOGLGraph_CloseWin();                 stGLWinClosed = TRUE;                 return 0;         }         // Pass All Unhandled Messages To DefWindowProc         return DefWindowProc(hWnd,uMsg,wParam,lParam); }

[np_123]

Nvm figured it out.
I reversed my logic as in:

My non-callback function continuously returns a boolean value determined by an internal variable. I loop on this function, waiting for it to be True. (I assume because it's always entering & returning the procedure, that's why it doesn't hang).
When the callback registers a click it sets the variable to True. This causes the function to return True. Problem now solved.
Ty