应该是最简单的问题了，但我不懂，虚心请教

Question

//下面的代码几乎都是抄孙鑫的视频教程里面来的，我在VC6里面能编译能过，但是运行时就是不显示窗口，但在进程里面却发现有在运行。
//请问这到底是怎么回事啊？？ 由于一直以来都是在用MinGw来写C++，对于VC不是太了解。我也想知道VC6的补丁版本怎样查，不知我的要不要装补丁。
//谢谢了！ 希望以后多指教！！！
#include<windows.h>
#include<stdio.h>LRESULT CALLBACK WinSunProc(
HWND Hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);int WINAPI WinMain(
   HINSTANCE hInstance,
   HINSTANCE hPrevInstance,
   LPSTR lpCmdLine,
   int nShowCmd
   )
{
   WNDCLASS wndcls;
   wndcls.cbClsExtra=0;
   wndcls.cbClsExtra=0;
   wndcls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
   wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
   wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
   wndcls.hInstance=hInstance;
   wndcls.lpfnWndProc=WinSunProc;
   wndcls.lpszClassName="Hello Dan";
   wndcls.lpszClassName=NULL;
   wndcls.style=CS_HREDRAW | CS_VREDRAW;   RegisterClass(&wndcls);
   HWND hwnd;
   hwnd=CreateWindow("Love SDK","Love Linux",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 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,szChar,"Hello",0);
  break;
  case WM_LBUTTONDOWN:
      MessageBox(hwnd,"Mouse clicked ","World",0);
  HDC hdc;
  hdc=GetDC(hwnd);
  TextOut(hdc,0,50,"Computer science",strlen("Computer science"));
  ReleaseDC(hwnd,hdc);
  break;
  case WM_PAINT:
  HDC dc;
  PAINTSTRUCT ps;
  dc=BeginPaint(hwnd,&ps);
  TextOut(dc,0,0,"Sun Java",strlen("Sum Java"));
  EndPaint(hwnd,&ps);
  break;
  case WM_CLOSE:
  if(IDYES==MessageBox(hwnd,"Do you really want to exit?","EXIT",MB_YESNO))
  {
    DestroyWindow(hwnd);
  }
  break;
  case WM_DESTROY:
  PostQuitMessage(0);
      break;
  default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);    
  }
  return 0;
}

Answer 1

事先，新建一个Wind32 Application的简单工程，然后将代码填进去试试。

Answer 2

相当于C语言的hello world 程序~~~~~~

Answer 3

我建的就是Wind32   Application空白工程再手抄一遍填平上来的。但就是不能显示，但我直接用随同视频一起的代码就完全没有问题。
请问有谁遇到过这样的问题吗？
Thanks

Answer 4

1.
wndcls.cbClsExtra=0;
   wndcls.cbClsExtra=0;
cbWndExtra;2.
CreateWindow("Hello Dan"....

Answer 5

wndcls.lpszClassName="Hello Dan";
   wndcls.lpszClassName=NULL;
你最好在比对比对

Answer 6

#include<windows.h>
#include<stdio.h>LRESULT CALLBACK WinSunProc(
                            HWND Hwnd,
                            UINT uMsg,
                            WPARAM wParam,
                            LPARAM lParam
                            );int WINAPI WinMain(
                   HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nShowCmd
                   )
{
   WNDCLASS wndcls;
   wndcls.cbClsExtra=0;
   wndcls.cbWndExtra=0;
   wndcls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
   wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
   wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
   wndcls.hInstance=hInstance;
   wndcls.lpfnWndProc=WinSunProc;
   wndcls.lpszClassName="Hello Dan";
   wndcls.lpszMenuName=NULL;
   wndcls.style=CS_HREDRAW | CS_VREDRAW;   RegisterClass(&wndcls);
   HWND hwnd;
   hwnd=CreateWindow("Hello Dan","Love Linux",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 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,szChar,"Hello",0);
      break;
  case WM_LBUTTONDOWN:
      MessageBox(hwnd,"Mouse clicked ","World",0);
      HDC hdc;
      hdc=GetDC(hwnd);
      TextOut(hdc,0,50,"Computer science",strlen("Computer science"));
      ReleaseDC(hwnd,hdc);
      break;
  case WM_PAINT:
      HDC dc;
      PAINTSTRUCT ps;
      dc=BeginPaint(hwnd,&ps);
      TextOut(dc,0,0,"Sun Java",strlen("Sum Java"));
      EndPaint(hwnd,&ps);
      break;
  case WM_CLOSE:
      if(IDYES==MessageBox(hwnd,"Do you really want to exit?","EXIT",MB_YESNO))
      {
        DestroyWindow(hwnd);
      }
      break;
  case WM_DESTROY:
      PostQuitMessage(0);
      break;
  default:
      return DefWindowProc(hwnd,uMsg,wParam,lParam);    
  }
  return 0;
}

Answer 7

恩，抄的时候不要乱改，先搞清楚原理再去改。
   wndcls.lpszClassName="Hello Dan"; //窗口类的名称是"Hello Dan"
//   wndcls.lpszClassName=NULL; //错了，上面赋值了，怎么又改成NULL？
   wndcls.style=CS_HREDRAW | CS_VREDRAW;   RegisterClass(&wndcls);
   HWND hwnd;
//   hwnd=CreateWindow("Love SDK","Love Linux",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
   hwnd=CreateWindow("Love Dan","Love Linux",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
//创建的窗口类要和注册的一致，最好用一个变量来保存这个窗口类名成，防止输入错误

Answer 8

被转晕了，应该这样：
   hwnd=CreateWindow("Hello Dan","Love Linux",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
所以说用一个变量来保存窗口类名是多么有必要。

Answer 9

基本就是wndcls里的成员都得赋值~

Answer 10

窗口  wndcls.lpszClassName="Hello Dan";
   wndcls.lpszClassName=NULL;和 创建的类名不一致

Answer 11

1.
wndcls.cbClsExtra=0;
wndcls.cbClsExtra=0;
上面两句话改为：
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;2. 
wndcls.lpszClassName="Hello Dan";
wndcls.lpszClassName=NULL;
上面两句改为：
wndcls.lpszClassName="Hello Dan";
wndcls.lpszMenuName=NULL;3.
hwnd=CreateWindow("Love SDK","Love Linux",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);
修改为：
hwnd=CreateWindow("Hello Dan","Love Linux",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);