WINDOWS 编程解决方法

WINDOWS 编程
#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
  ){
  switch(uMsg){
  case WM_CHAR:
  char szChar[20];
  sprintf(szChar,"char is %d",wParam);
  MessageBox(hwnd,(LPCWSTR)szChar,(LPCWSTR)"weixin",0);
  break;
  case WM_LBUTTONDOWN:
  MessageBox(hwnd,(LPCWSTR)"button clicked",(LPCWSTR)"weixin",0);
  HDC hdc;
  hdc = GetDC(hwnd);
  TextOut(hdc,100,100,(LPCWSTR)"北京计算机培训中心。",strlen("北京计算机培训中心。"));
  ReleaseDC(hwnd,hdc);
  break;
  case WM_PAINT:
  HDC hdc1;
  PAINTSTRUCT ps;
  hdc1 = BeginPaint(hwnd,&ps);
  TextOut(hdc1,100,200,(LPCWSTR)"北京paint测试中心。",strlen("北京paint测试中心。"));
  EndPaint(hwnd,&ps);
  break;
  case WM_CLOSE:
  if(IDYES == MessageBox(hwnd,(LPCWSTR)"是否真的结束？",(LPCWSTR)"weixin",MB_YESNO))
  DestroyWindow(hwnd);
  break;
  case WM_DESTROY:
  PostQuitMessage(0);
  break;
  default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);
  }
  return 0;
}
int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
  ){
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbClsExtra = 0;
wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor = LoadCursor(NULL,IDC_APPSTARTING);
wndcls.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndcls.lpfnWndProc = WinSunProc;
wndcls.lpszClassName = (LPCWSTR)"weixin2003";
wndcls.lpszMenuName = NULL;
wndcls.style = CS_HREDRAW | CS_VREDRAW;

RegisterClass(&wndcls);

HWND hwnd;
hwnd = CreateWindow((LPCWSTR)"weixin2003",(LPCWSTR)"北京test",WS_OVERLAPPEDWINDOW,100,100,400,600,NULL,NULL,hInstance,NULL);

ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);

MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
我写了这段程序结果却显示不出窗口，为什么？我在vc2010上写的 windows
[解决办法]
声明窗口类的时候需要初始化。

WNDCLASS wndcls;

WNDCLASS wndcls = {0};