今天重寫了一下3D程序的架構(gòu)，基本上是參考DX9b那套構(gòu)架寫的，發(fā)現(xiàn)CreateWindow返回NULL，而且GetLastError()也返回0，一時(shí)很奇怪，后來(lái)上網(wǎng)查了一下，才發(fā)現(xiàn)是WndProc函數(shù)的問(wèn)題，我代碼如下：
if( m_hWnd == NULL)
{
// Register the windows class
WNDCLASS wndClass = { 0, WndProc, 0, 0, hInst,
LoadIcon( hInst, MAKEINTRESOURCE(IDI_MY3DGRAPHIC) ),
LoadCursor( NULL, IDC_ARROW ),
(HBRUSH)GetStockObject(WHITE_BRUSH),
NULL, m_szWindowClass };
RegisterClass( &wndClass );
// Set the window's initial style
m_dwWindowStyle = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME |
WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_VISIBLE;
// Set the window's initial width
RECT rc;
SetRect( &rc, 0, 0, m_dwCreationWidth, m_dwCreationHeight );
AdjustWindowRect( &rc, m_dwWindowStyle, true );
// Create the render window
m_hWnd = CreateWindow( m_szWindowClass,
m_strWindowTitle,
m_dwWindowStyle,
CW_USEDEFAULT,
CW_USEDEFAULT,
(rc.right - rc.left),
(rc.bottom - rc.top),
0,
NULL, //LoadMenu( hInstance, MAKEINTRESOURCE(IDC_MY3DGRAPHIC) ),
hInstance,
0 );
WndProc代碼如下：
LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
return g_sApp->MsgProc( hWnd, uMsg, wParam, lParam );
}
因?yàn)樵赪ndProc中，g_sApp指針此時(shí)還為NULL，所以創(chuàng)建不成功。
調(diào)用CreateWindow時(shí)，CreateWindow會(huì)調(diào)用一次WndProc，并且要求WndProc返回TRUE，因此要注意該問(wèn)題。