让我郁闷好久的一个入门问题！在线求高手指教！

Question

想在主窗口中建立一个按钮，编译连接都没错误，可运行后主窗口中始终是空空荡荡！代码如下：
#include<windows.h>
#define IDB_PUSHBUTTON 200
//#include<stdio.h>
HINSTANCE hInst1;
HWND hwndButton;LRESULT CALLBACK WndLiaoProc(HWND,UINT,WPARAM,LPARAM);
LRESULT CALLBACK DlgProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(
   HINSTANCE hInst,
   HINSTANCE hPreInst,
   LPSTR lpszCmdLine,
   int nCmdShow)
{
WNDCLASS wcApp;
wcApp.lpszClassName="Yhong";
wcApp.hInstance=hInst;
wcApp.hCursor=LoadCursor(NULL,IDC_ARROW);
wcApp.hIcon=LoadIcon(hInst,IDI_APPLICATION);
wcApp.lpfnWndProc=WndLiaoProc;
wcApp.cbClsExtra=0;
wcApp.cbWndExtra=0;
wcApp.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wcApp.lpszMenuName=NULL;
wcApp.style=CS_HREDRAW|CS_VREDRAW;
RegisterClass(&wcApp);
hInst1=hInst; HWND hWnd;
hWnd=CreateWindow("Yhong","Yhong",WS_OVERLAPPEDWINDOW&~WS_MAXIMIZEBOX,CW_USEDEFAULT,CW_USEDEFAULT,600,400,
NULL,NULL,hInst,NULL);
hwndButton=CreateWindow("Button","按钮控件！",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
20,400,240,25,hWnd,(HMENU)IDB_PUSHBUTTON,hInst1,NULL);

ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);

MSG lpMsg;
while(GetMessage(&lpMsg,NULL,0,0))
{
            TranslateMessage(&lpMsg);
            DispatchMessage(&lpMsg);

}
return(0);
}LRESULT CALLBACK WndLiaoProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

PAINTSTRUCT ps;
HDC hdc; switch (message) 
{
case WM_CREATE:


break;

case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: 在此添加任意绘图代码...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

Answer 1

主窗口就是按钮...什么意思！将下面的语句
hwndButton=CreateWindow("Button","按钮控件！",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
20,400,240,25,hWnd,(HMENU)IDB_PUSHBUTTON,hInst1,NULL);
移到WM_CREATE:后也不行呀！

Answer 2

将
hwndButton=CreateWindow("Button","按钮控件！",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
20,400,240,25,hWnd,(HMENU)IDB_PUSHBUTTON,hInst1,NULL);
改为
hwndButton=CreateWindow("Button","按钮控件！",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE,
20,100,240,25,hWnd,(HMENU)IDB_PUSHBUTTON,hInst1,NULL);
控钮就出来了！
可是窗口大小改变后，按钮又消失了，难道要将上面的语句放在WM_PAINT后吗？

Answer 3

建议你在窗口过程中响应WM_SIZE消息，调整按钮的大小和位置。

Answer 4

将CreateWindow语句放在WM_CREATE后，
将ShowWindow语句放在WM_PAINT后问题就解决了！可是当建立一个DateTimePicker控件时上面的问题又来了！
case WM_CREATE:
hwndDate=CreateWindow("DATETIMEPICK_CLASS",
                                         "DateTime！",
                                          WS_BORDER|WS_CHILD|WS_VISIBLE，
               20,180,80,25,
                                           hWnd,
                                          (HMENU)IDB_DATETIME,
                                          hInst1,NULL);
                  break;
          case WM_PAINT:
                   hdc = BeginPaint(hWnd, &ps);
ShowWindow(hwndDate,SW_SHOW);
EndPaint(hWnd, &ps);
break;没有出错信息，也没有控件显示出来！