为什么修改了部分代码，连窗口都不能显示！

// winapp1.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include <Windows.h>
#define IDC_STATIC 1
#define IDC_LISTBOX 2

LRESULT CALLBACK wndprog(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,  int nShowCmd )
{
    TCHAR szappname[] = TEXT("mywindow");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;
    wndclass.style = CS_HREDRAW|CS_VREDRAW;
    wndclass.lpfnWndProc = wndprog;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szappname;

    if ( !RegisterClass(&wndclass))
    {
        MessageBox(NULL,"create window failed!",szappname,MB_ICONERROR);
        return 0 ;
    }

    hwnd = CreateWindow(szappname,TEXT("This is my window !"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,
        CW_USEDEFAULT,CW_USEDEFAULT,
        NULL,    NULL,
        hInstance,    NULL);

    ShowWindow(hwnd,nShowCmd);
    UpdateWindow(hwnd);

    while( GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK wndprog(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)
{
    static HWND hlistbox, hstatic;
    static int xclinet, yclient;
    static int xchar, ychar;
    static TCHAR *strings;
    static TCHAR *szbuffer = NULL,*temp = NULL,*save = NULL;
    int index, length,priorlength=0;

    switch (message)
    {
    case WM_CREATE:
    {
        hstatic = CreateWindow(TEXT("static"),TEXT("nothing"),
            WS_CHILD|WS_VISIBLE|WS_BORDER|SS_LEFT,
            0,0,0,0,hwnd,(HMENU)IDC_STATIC,(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

        hlistbox = CreateWindow(TEXT("listbox"),NULL,
            WS_CHILD|WS_VISIBLE|LBS_STANDARD,
            0,0,0,0,hwnd,(HMENU)IDC_LISTBOX,(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

        for ( int i = 0; i < 26; i++)
        {   
            //strings = (TCHAR *)malloc(sizeof(TCHAR) * 2); //保存一个字符
            strings = new TCHAR[2];
            TCHAR ch = 'A' + i;
            lstrcpy(strings , &ch);
            //strings[0] = 'A'+i;
            strings[1] = '\0';
            SendMessage(hlistbox,LB_ADDSTRING,0,(LPARAM)strings);
        }

        SendMessage(hlistbox,LB_SETCURSEL,2,0);
    }
        return 0;
    case WM_SIZE:
        {
            xchar = LOWORD(GetDialogBaseUnits());
            ychar = HIWORD(GetDialogBaseUnits());
            xclinet = LOWORD(lparam);
            yclient = HIWORD(lparam);

            MoveWindow(hstatic,xclinet/4,yclient/8,xclinet/2,ychar,TRUE);
            MoveWindow(hlistbox,xclinet/4,yclient/4,xclinet/2,ychar*10,TRUE);
        }
        return 0 ;
    case WM_COMMAND:
        {
            if ( LOWORD(wparam) == IDC_LISTBOX && HIWORD(wparam) == LBN_SELCHANGE )
            {
                index = SendMessage(hlistbox, LB_GETCURSEL,0,0);
                length = SendMessage(hlistbox, LB_GETTEXTLEN,index,0)+1 ;
                save = new TCHAR [sizeof(TCHAR) * length];
                SendMessage(hlistbox,LB_GETTEXT,index,(LPARAM)save);

                // 原来的静态我文本还有字符
                if ( szbuffer)
                {
                    length += lstrlen(szbuffer);
                    temp = new TCHAR[sizeof(TCHAR) * (lstrlen(szbuffer) + 1)];
                    lstrcpy(temp,szbuffer);
                    //free(szbuffer);
                    delete [] szbuffer;
                }
                szbuffer = new TCHAR[sizeof(TCHAR) * length];
                if ( temp)
                {   
                    lstrcpy(szbuffer,temp);
                    delete [] temp;
                }
                else //使用lstrcat 或则 strcat ,若接收器为空，则将第一位设成'\0'，
                    szbuffer[0] = '\0'; //这两个函数总是寻找'\0'作为起始位置
                lstrcat(szbuffer,save);
                szbuffer[length-1] = '\0';
                delete [] save;
                SetWindowText(hstatic,szbuffer);
            }
        }
        return 0;
    case WM_SETFOCUS:
        SetFocus(hlistbox);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd,message,wparam,lparam);
}