//文件wnd2.cpp
#include "wnd2.h"
char szTitle[]="简单的Hello程序";
char szWindowClass[]="W32";
char szMenuName[]="NULL";
int APIENTRY WinMain(HINSTANCE hInstance ,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    MSG msg;
    InitApplication(hInstance);
    if(!InitInstance(hInstance,nCmdShow))return false ;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);

    }
    return msg.wParam;
}

ATOM InitApplication(HINSTANCE hInstance)
{
    WNDCLASS wc;
    wc.style=CS_HREDRAW|CS_VREDRAW;
    wc.lpfnWndProc=(WNDPROC)WndProc;
    wc.cbClsExtra=0;
    wc.cbWndExtra=0;
    wc.hInstance=hInstance;
    wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor=LoadCursor(NULL,IDC_ARROW);
    wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName=szMenuName;
    wc.lpszClassName=szWindowClass;
    return RegisterClass(&wc);
}
BOOL InitInstance(HINSTANCE hInstance,int nCmdShow)
{
    HWND hWnd;
    hWnd=CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW|WS_VSCROLL|WS_HSCROLL,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL
        );
    if(!hWnd)return false;
    ShowWindow(hWnd,nCmdShow);
    UpdateWindow(hWnd);
    return true;
}
//文件wnd21.cpp

#include "wnd2.h"
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    char szHello[]="Hello";
    switch(message)
    {
    case WM_PAINT:
    hdc=BeginPaint(hWnd,&ps);
        TextOut(hdc,80,150,szHello,strlen(szHello));
        EndPaint(hWnd,&ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd,message,wParam,lParam);
    
    }
return 0;
}
//文件wnd2.h
#include <windows.h>
extern char szTitle[];
extern char szWindowClass[];

ATOM InitApplication(HINSTANCE );
BOOL InitInstance(HINSTANCE ,int );
LRESULT CALLBACK WndProc (HWND ,UINT ,WPARAM ,LPARAM);
int APIENTRY WinMain(HINSTANCE  ,HINSTANCE ,LPSTR ,int );

无法通过编译，请各位大侠帮帮忙？