做个简单的windows程序，可是无法显示创建的窗口

[心已死两目茫然]

我是在VS2008下运行的，下面是代码：

#include <windows.h>
#include <stdio.h>
const size_t namesize = 100;
const TCHAR classname[namesize] = L"wenxing";

LRESULT CALLBACK	WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
	switch(message)
	{
	case WM_CHAR:
		wchar_t szChar[20];
		//sprintf(szChar,"char is code %d",wparam);
		MessageBox(hwnd,szChar,L"char",0);
		break;
	}
	return 0;
}

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR lpCmdLine,int nShowCmd)
{

	WNDCLASS wnd;
	wnd.style = CS_HREDRAW | CS_VREDRAW;
	wnd.lpfnWndProc = WndProc;
	wnd.cbClsExtra = 0;
	wnd.cbWndExtra = 0;
	wnd.hInstance = hInstance;
	wnd.hIcon = LoadIcon(NULL,IDI_ERROR);
	wnd.hCursor = LoadCursor(NULL,IDC_ARROW);
	wnd.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
	wnd.lpszMenuName = NULL;
	wnd.lpszClassName = classname;
	
	ATOM atom = RegisterClass(&wnd);
	
	if(!atom)
		MessageBox(NULL,L"1233",L"lqm",MB_OKCANCEL);

	HWND hand = NULL;
	hand = CreateWindow(classname,L"Hello",WS_OVERLAPPEDWINDOW,0,0,800,600,NULL,NULL,hInstance,NULL);
	ShowWindow(hand,SW_SHOWNORMAL);
	if(!hand)
	{
		if(IDYES == MessageBox(NULL,L"创建失败!",L"lqm",MB_YESNO))
			exit(0);
	}	
	UpdateWindow(hand);
}

我的问题是程序编译没有错误，看进程中也能查到这个程序在运行，可是就无法显示窗口，请高手指点一下。

[RabbitLBJ]

把窗口处理函数的返回值改为::DefWindowProc(hwnd,message,wparam,lparam);
CreateWindow会发送一个WM_CREATE消息给WndProc，如果你自己不处理，也不调用默认的函数来处理，窗口就创建失败了

一般消息都是调用::DefWindowProc(hwnd,message,wparam,lparam);来处理，而不是直接返回0

LRESULT CALLBACK    WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
	switch(message)
	{
	case WM_CHAR:
		wchar_t szChar[20];
		//sprintf(szChar,"char is code %d",wparam);
		MessageBox(hwnd,szChar,L"char",0);
		break;
	}
	return ::DefWindowProc(hwnd,message,wparam,lparam);
}

[心已死两目茫然]

谢谢，原来是这样