为什么不能连续注册两个wndclass
WNDCLASS aa;
aa.style = CS_DBLCLKS | CS_SAVEBITS | CS_BYTEALIGNWINDOW;
aa.lpfnWndProc = DefDlgProc;
aa.cbClsExtra = 0;
aa.cbWndExtra = DLGWINDOWEXTRA + 2*sizeof(LONG_PTR);
aa.hInstance = hinst;
aa.hIcon = NULL;
aa.hCursor = LoadCursor(NULL, IDC_ARROW);
aa.hbrBackground = (HBRUSH) (COLOR_BACKGROUND +1);
aa.lpszMenuName = NULL;
aa.lpszClassName = "PuTTYConfigBoxx";
RegisterClass(&aa);
WNDCLASS wc;
wc.style = CS_DBLCLKS | CS_SAVEBITS | CS_BYTEALIGNWINDOW;
wc.lpfnWndProc = DefDlgProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = DLGWINDOWEXTRA + 2*sizeof(LONG_PTR);
wc.hInstance = hinst;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) (COLOR_BACKGROUND +1);
wc.lpszMenuName = NULL;
wc.lpszClassName = "PuTTYConfigBox";
RegisterClass(&wc);