点击关闭按钮后原来的窗口变成锁定状态，不能操作，但是可以通过enter键来操作MessageBox对话框确认关闭窗口！现象就好像是MessageBox对话框功能出来了，就是看不到框而已！
请问各位大神，怎样才能令这个MessageBox对话框正常显示。
#include
LRESULT CALLBACK win(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASS wc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor = LoadCursor(NULL,IDC_ARROW);
wc.hIcon = LoadIcon(NULL,IDI_WINLOGO);
wc.hInstance = hInstance;
wc.lpfnWndProc = win;
wc.lpszClassName = "first";
wc.lpszMenuName = NULL;
wc.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wc);
HWND hwnd;
hwnd = CreateWindow("first","第一个窗口",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK win(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
switch(uMsg)
{
case WM_CHAR:
break;
case WM_LBUTTONDOWN:
break;
case WM_PAINT:
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"是否结束？","提醒！",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}