windows编程 建立了IDM_BITMAP还是报IDM_BITMAP: undeclared identifier

如上我建立了IDM_BITMAP但是还是报错，望大神指导
#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HelloWin") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
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, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName,
TEXT ("The Hello Program"),

WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

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

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HBITMAP hBitmap;
static int cxClient,cyClient,cxSource,cySource;
BITMAP bitmap;
HDC hdc,hdcMem;
HINSTANCE hInstance;
PAINTSTRUCT ps ;
RECT rect ;
int x,y,mx,my;
switch (message)
{
case WM_CREATE:
hInstance=((LPCREATESTRUCT)lParam)->hInstance;
hBitmap=LoadBitmap(hInstance,MAKEINTRESOURCE(IDM_BITMAP));
GetObject(hBitmap,sizeof(BITMAP),&bitmap);
cxSource=bitmap.bmWidth;
cySource=(bitmap.bmHeight)/2;
return 0 ;

case WM_SIZE:
cxClient=LOWORD(lParam);
cyClient=HIWORD(lParam);
return 0;

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

hdcMem=CreateCompatibleDC(hdc);
SelectObject(hdcMem,hBitmap);

for (y=100;y<cyClient-100;y+=cySource)
{
for (x=100;x<cxClient-100;x+=cxSource)
{
BitBlt(hdc ,x,y, cxSource,cySource,hdcMem,0,0,SRCCOPY);
}
}

DeleteDC(hdcMem);
EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
} windows编程 bitmap

[解决办法]
少包含了头文件吧，看看 IDM_BITMAP 那里定义的，把对应的文件包含进来。