c++ WIN32:放置在程序运行时执行的代码的地方

这似乎是一个简单的问题，但我不知道在哪里放置Win32代码执行，而程序正在运行。作为一个简化的示例，我提供了一个示例，其中包含我认为是标准的Win32窗口初始化代码，后跟一个简单的"Beep"命令。我尝试在不同的地方插入beep命令，但结果是以下三个之一:

1. 哔哔声响起，循环不断
2. 没有听到任何蜂鸣声
3. 哔哔声只在我关闭程序时出现

我使用的代码如下所示。这只是我从一个在线资源中获取的一个示例，最后添加了beep命令。没有编译器错误。在这个例子中，当我关闭程序时，哔哔声响起。如你所料，这是我的第一个Win32应用。

#include <windows.h>
    /*  Declare Windows procedure  */
    LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
    /*  Make the class name into a global variable  */
    char szClassName[ ] = "WindowsApp";
    int WINAPI WinMain (HINSTANCE hThisInstance,
                HINSTANCE hPrevInstance,
                LPSTR lpszArgument,
                int nFunsterStil)
{
                    HWND hwnd;               /* This is the handle for our window */
                    MSG messages;            /* Here messages to the application are saved */
                    WNDCLASSEX wincl;        /* Data structure for the windowclass */
       /* The Window structure */
       wincl.hInstance = hThisInstance;
       wincl.lpszClassName = szClassName;
       wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
       wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
       wincl.cbSize = sizeof (WNDCLASSEX);
       /* Use default icon and mouse-pointer */
       wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
       wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
       wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
       wincl.lpszMenuName = NULL;                 /* No menu */
       wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
       wincl.cbWndExtra = 0;                      /* structure or the window instance */
       /* Use Windows's default color as the background of the window */
       wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
       /* Register the window class, and if it fails quit the program */
       if (!RegisterClassEx (&wincl))
               return 0;
       /* The class is registered, let's create the program*/
       hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "Matt's Program That Beeps",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
            );
       /* Make the window visible on the screen */
       ShowWindow (hwnd, nFunsterStil);
       /* Run the message loop. It will run until GetMessage() returns 0 */
       while (GetMessage (&messages, NULL, 0, 0))
       {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
       }
       /* The program return-value is 0 - The value that PostQuitMessage() gave */
       return messages.wParam;
}
/*  This function is called by the Windows function DispatchMessage()  */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch (message)                  /* handle the messages */
 {
    case WM_DESTROY:
        PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
        break;
    default:                      /* for messages that we don't deal with */
        return DefWindowProc (hwnd, message, wParam, lParam);
}
    Beep( 750, 300 );              /* This is the beep command */
    return 0;
}