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开发学院软件开发VC ATL布幔之下的秘密(5) 阅读

ATL布幔之下的秘密(5)

 2006-07-22 22:54:48 来源:WEB开发网   
核心提示: 程序71. #include <windows.h>class ZWindow;ZWindow* g_pWnd = NULL;class ZWindow{public:HWND m_hWnd;ZWindow(HWND hWnd = 0) : m_hWnd(hWnd) { }in

程序71. #include <windows.h>
class ZWindow;
ZWindow* g_pWnd = NULL;
class ZWindow
{
public:
  HWND m_hWnd;
  ZWindow(HWND hWnd = 0) : m_hWnd(hWnd) { }
  inline void Attach(HWND hWnd)
  { m_hWnd = hWnd; }
  inline BOOL ShowWindow(int nCmdShow)
  { return ::ShowWindow(m_hWnd, nCmdShow); }
  inline BOOL UpdateWindow()
  { return ::UpdateWindow(m_hWnd); }
  inline HDC BeginPaint(LPPAINTSTRUCT ps)
  { return ::BeginPaint(m_hWnd, ps); }
  inline BOOL EndPaint(LPPAINTSTRUCT ps)
  { return ::EndPaint(m_hWnd, ps); }
  inline BOOL GetClientRect(LPRECT rect)
  { return ::GetClientRect(m_hWnd, rect); }
  BOOL Create(LPCTSTR szClassName, LPCTSTR szTitle, HINSTANCE hInstance,
        HWND hWndParent = 0, DWORD dwStyle = WS_OVERLAPPEDWINDOW,
        DWORD dwExStyle = 0, HMENU hMenu = 0, int x = CW_USEDEFAULT,
        int y = CW_USEDEFAULT, int nWidth = CW_USEDEFAULT,
        int nHeight = CW_USEDEFAULT)
  {
    m_hWnd = ::CreateWindowEx(dwExStyle, szClassName, szTitle, dwStyle,
                  x, y, nWidth, nHeight, hWndParent, hMenu,
                  hInstance, NULL);
    return m_hWnd != NULL;
  }
  virtual LRESULT OnPaint(WPARAM wParam, LPARAM lParam)
  {
    HDC hDC;
    PAINTSTRUCT ps;
    RECT rect;
    hDC = BeginPaint(&ps);
    GetClientRect(&rect);
    ::DrawText(hDC, "Hello world", -1, &rect,
          DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    EndPaint(&ps);
    return 0;
  }
  virtual LRESULT OnLButtonDown(WPARAM wParam, LPARAM lParam)
  {
    return 0;
  }
  virtual LRESULT OnCreate(WPARAM wParam, LPARAM lParam)
  {
    return 0;
  }
  virtual LRESULT OnKeyDown(WPARAM wParam, LPARAM lParam)
  {
    return 0;
  }
  static LRESULT CALLBACK StartWndProc(HWND hWnd, UINT uMsg,
                     WPARAM wParam, LPARAM lParam)
  {
    ZWindow* pThis = g_pWnd;
    if (uMsg == WM_NCDESTROY)
      ::PostQuitMessage(0);
    switch (uMsg)
    {
    case WM_CREATE:
      pThis->OnCreate(wParam, lParam);
      break;
    case WM_PAINT:
      pThis->OnPaint(wParam, lParam);
      break;
    case WM_LBUTTONDOWN:
      pThis->OnLButtonDown(wParam, lParam);
      break;
    case WM_KEYDOWN:
      pThis->OnKeyDown(wParam, lParam);
      break;
    case WM_DESTROY:
      ::PostQuitMessage(0);
      break;
    }
    return ::DefWindowProc(hWnd, uMsg, wParam, lParam);
  }
};
class ZDriveWindow1 : public ZWindow
{
public:
  LRESULT OnPaint(WPARAM wParam, LPARAM lParam)
  {
    HDC hDC;
    PAINTSTRUCT ps;
    RECT rect;
    hDC = BeginPaint(&ps);
    GetClientRect(&rect);
    ::SetBkMode(hDC, TRANSPARENT);
    ::DrawText(hDC, "ZDriveWindow1", -1, &rect,
          DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    EndPaint(&ps);
    return 0;
  }
  LRESULT OnLButtonDown(WPARAM wParam, LPARAM lParam)
  {
    ::MessageBox(NULL, "ZDriveWindow1::OnLButtonDown", "Msg", MB_OK);
    return 0;
  }
};
class ZDriveWindow2 : public ZWindow
{
public:
  LRESULT OnPaint(WPARAM wParam, LPARAM lParam)
  {
    HDC hDC;
    PAINTSTRUCT ps;
    RECT rect;
    hDC = BeginPaint(&ps);
    GetClientRect(&rect);
    ::SetBkMode(hDC, TRANSPARENT);
    ::Rectangle(hDC, rect.left, rect.top, rect.right, rect.bottom);
    ::DrawText(hDC, "ZDriveWindow2", -1, &rect,
          DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    EndPaint(&ps);
    return 0;
  }
  LRESULT OnLButtonDown(WPARAM wParam, LPARAM lParam)
  {
    ::MessageBox(NULL, "ZDriveWindow2::OnLButtonDown", "Msg", MB_OK);
    return 0;
  }
};
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
          LPSTR lpCmdLine,  int nCmdShow)
{
  char szAppName[] = "Hello world";
  MSG msg;
  WNDCLASS wnd;
  ZDriveWindow1 zwnd1;
  ZDriveWindow2 zwnd2;
  
  wnd.cbClsExtra  = NULL;
  wnd.cbWndExtra  = NULL;
  wnd.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
  wnd.hCursor    = LoadCursor(NULL, IDC_ARROW);
  wnd.hIcon     = LoadIcon(NULL, IDI_APPLICATION);
  wnd.hInstance   = hInstance;
  wnd.lpfnWndProc  = ZWindow::StartWndProc;
  wnd.lpszClassName = szAppName;
  wnd.lpszMenuName = NULL;
  wnd.style     = CS_HREDRAW | CS_VREDRAW;
  
  if (!RegisterClass(&wnd))
  {
    MessageBox(NULL, "Can not register window class", "Error",
           MB_OK | MB_ICONINFORMATION);
    return -1;
  }
  g_pWnd = &zwnd1;
  zwnd1.Create(szAppName, "Hell world", hInstance);
  zwnd1.ShowWindow(nCmdShow);
  zwnd1.UpdateWindow();
  g_pWnd = &zwnd2;
  zwnd2.Create(szAppName, "Hello world", hInstance, zwnd1.m_hWnd,
    WS_VISIBLE | WS_CHILD | ES_MULTILINE, NULL, NULL, 0, 0, 150, 150);
  while (GetMessage(&msg, NULL, 0, 0))
  {
    DispatchMessage(&msg);
  }
  
  return msg.wParam;
}
  
程序的输出表明,不管你单击了哪个窗口,都会弹出相同的MessageBox。

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Tags:ATL 之下 秘密

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