求教：这段代码为什么没有实现啊

Question

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{RECT Rect;
switch (message) 
case WM_CREATE:
GetClientRect(hWnd,&Rect);
hPushButton=CreateWindow(szWindowClass,
 "启动一个对话框",
 BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
(Rect.left-Rect.right)/2-50,
(Rect.bottom-Rect.top)/2-15,
 100,
30,
 hWnd,
  (HMENU)IDB_PUSHBUTTON,
hInst,
 NULL);             break;
这是一段WIN32代码是用来在生成的窗口中显示一个按钮，但貌似不能被执行，请高手帮帮忙吧

Answer 1

hPushButton=CreateWindow(BUTTON,
"启动一个对话框",
BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
(Rect.left-Rect.right)/2-50,
(Rect.bottom-Rect.top)/2-15,
100,
30,
hWnd,
(HMENU)IDB_PUSHBUTTON,
hInst,
NULL);

Answer 2

不好意思,错了个位置hPushButton=CreateWindow("BUTTON",
"启动一个对话框",
BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
(Rect.left-Rect.right)/2-50,
(Rect.bottom-Rect.top)/2-15,
100,
30,
hWnd,
(HMENU)IDB_PUSHBUTTON,
hInst,
NULL……

Answer 3

为什么要把第一个参数改成Button啊