哪位高手能帮小弟我把上面程序中的窗体，变成无边框窗体

#include<windows.h> 


LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); 
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,int nCmdShow) 
{    

    MSG msg;
    HWND hWnd; 
    WNDCLASS wc;
    char lpszClassName[]="Window"; 
    char lpszTitle[]="ABCDEFG";
    wc.style=CS_HREDRAW|CS_VREDRAW; 
    wc.lpfnWndProc=WndProc;
    wc.cbClsExtra=0; 
    wc.cbWndExtra=0;
    wc.hInstance=hInstance; 
    wc.hIcon=LoadIcon(NULL,IDI_APPLICATION); 
    wc.hCursor=LoadCursor(NULL,IDC_IBEAM); 
    wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH); 
    wc.lpszMenuName=NULL; 
    wc.lpszClassName=lpszClassName;
    if(!RegisterClass(&wc)) 
    {
        MessageBeep(0); 
        return (FALSE);
    } 
    hWnd=CreateWindow ( lpszClassName, 
        lpszTitle, 
        WS_OVERLAPPEDWINDOW, 
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT, 
        NULL, 
        NULL,
        hInstance,
        NULL 
        ); 
    if(!hWnd) 
        return (FALSE); 
    ShowWindow(hWnd,nCmdShow);
    UpdateWindow(hWnd); 



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


    return (msg.wParam); 
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam) 
{ 
    PAINTSTRUCT PtStr; 
    static long nXChar,nYChar; 
    TEXTMETRIC tm; HDC hDC; 
    switch(uMsg) 
    { 
    case WM_CREATE:
        hDC=GetDC(hWnd); 
        GetTextMetrics(hDC,&tm); 
        nXChar=tm.tmAveCharWidth; 
        nYChar=tm.tmHeight+tm.tmExternalLeading; 
        ReleaseDC(hWnd,hDC); 
        return 0;
    case WM_PAINT: 
        hDC=BeginPaint(hWnd,&PtStr);
        SetTextColor(hDC,RGB(255,0,0));
        TextOut(hDC,nXChar+300,nYChar+100,"Hello!!!!!world!!!!!",20); 
        SetWindowPos( hWnd,HWND_TOPMOST,   100,  100,   600,   600,SWP_NOACTIVATE);
        EndPaint(hWnd,&PtStr); 
        return 0; 
    case WM_DESTROY: 
        PostQuitMessage(0);
    default: 
        return DefWindowProc(hWnd,uMsg,wParam,lParam);
    } 
    return(0); 
}