谁能告诉我我的窗口创建有什么问题？这个函数是从主函数中调用的，它全部编译并运行良好。然而，渲染出来的窗口根本就不是一个窗口，而只是一个白色的大方块。这是我的窗口创建功能：
/**
* handles everything for initialising a window
*
* @param hInst unique handle of window instance
* @param hPrevInst legacy parameter for copying memory from other instance into this one
* @param cmdLine commands application is started with
* @param cmdShow specifies how program should be displayed (maximised, minimized, or hidden)
*/
int Window::Init (HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmdLine, int cmdShow)
{
// name of application
static TCHAR appName[] = TEXT ("App");
// contains window class information
WNDCLASSEX wndC;
// window handle
HWND hWnd;
// define the windows class information
wndC.cbSize = sizeof (WNDCLASSEX); // specifies the size of the structure (in bytes)
wndC.style = CS_HREDRAW | CS_VREDRAW; // employs window class style to redraw if any resizing occurs
wndC.lpfnWndProc = WndProc; // pointer to the window procedure function
wndC.cbClsExtra = 0; // number of extra bytres to allocate for window class
wndC.cbWndExtra = 0; // number of extra bytes to allocate per window instance
wndC.hInstance = hInst; // handle to instnace conatining window procedure for this class
wndC.hIcon = NULL; // handle to large 32x32 (shown when alt + tab)
wndC.hCursor = LoadCursor (NULL, IDC_ARROW); // handle to class cursor resource
wndC.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1); // handle to class background brush (for painting background)
wndC.lpszMenuName = NULL; // pointer to string with name of class menu (no default menu)
wndC.lpszClassName = appName; // specifies windows class name
wndC.hIconSm = NULL; // handle to small 16x16 icon (top left corner of window)
// registers window class with system, will terminate is parameter is invalid
if (!RegisterClassEx (&wndC)) return 0;
// rect used for defining window
RECT wndRc;
// calculate size of window based on entire client window size
wndRc.left = 0;
wndRc.top = 0;
wndRc.right = 800;
wndRc.bottom = 600;
long tStyle = 0;
// style chosen based on whether this window is fullscreen
if (mFullScreen)
tStyle = WS_POPUP;
else
{
tStyle = WS_OVERLAPPEDWINDOW;
// calculates required size of window rectangle, based on desired client-rectangle size
AdjustWindowRect (&wndRc, tStyle, FALSE);
}
// now class is registered, we create a window with it
hWnd = CreateWindowEx (0, appName, appName, WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT,
wndRc.right - wndRc.left, wndRc.bottom - wndRc.top, NULL, NULL, hInst, NULL);
// check we have a valid handle
if (hWnd == NULL) return 0;
// show window and update it (cmdShow allows user to specify whether they want window to start maximised, minimised, etc.)
ShowWindow (hWnd, cmdShow);
UpdateWindow (hWnd);
// if we fail to create the direct x device send an error message and terminate
if (DirectDraw::GetInstance()->CreateDevice (hWnd, 800, 600, mFullScreen) != 1)
{
MessageBox (hWnd, "Failed to create surfaces", "Error", MB_OK);
return 0;
}
// adds rectangle to the specified window's update region (portion of window to be redrawn)
InvalidateRect (hWnd, NULL, TRUE);
return 1;
}