有未经处理的异常: 0xC0000005: 读取位置 0xcccccccc 时发生访问冲突 怎么回事啊?大侠帮忙
#include <Windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
HWNDhWnd;
MSGmsg;
WNDCLASS wndclass;

wndclass.cbClsExtra= 0;
wndclass.cbWndExtra= 0;
wndclass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);

wndclass.hCursor= LoadCursor(NULL, IDC_ARROW);
wndclass.hIcon= LoadIcon(NULL, IDI_APPLICATION);
wndclass.hInstance= hInstance;
wndclass.lpfnWndProc= WndProc;
wndclass.lpszMenuName= NULL;
wndclass.style= CS_HREDRAW | CS_VREDRAW;

if (!RegisterClass(&wndclass))
return 0;


hWnd = CreateWindow("HelloMsg",
"我的窗口",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hWnd, nShowCmd);
UpdateWindow(hWnd);

while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (msg.wParam);
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_LBUTTONDOWN:
MessageBox(NULL, "欢迎进入Visual C++.NET!", "Hello", 0);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
return 0;
}

在vs2010下能生成,但调式不能通过,提示是:
WinExample.exe 中的 0x77d2e9ac 处有未经处理的异常: 0xC0000005: 读取位置 0xcccccccc 时发生访问冲突

[解决办法]

C/C++ code

#include <windows.h>/*  Declare Windows procedure  */LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);/*  Make the class name into a global variable  */char szClassName[ ] = "CodeBlocksWindowsApp";int WINAPI WinMain (HINSTANCE hThisInstance,                     HINSTANCE hPrevInstance,                     LPSTR lpszArgument,                     int nCmdShow){    HWND hwnd;               /* This is the handle for our window */    MSG messages;            /* Here messages to the application are saved */    WNDCLASSEX wincl;        /* Data structure for the windowclass */    /* The Window structure */    wincl.hInstance = hThisInstance;    wincl.lpszClassName = szClassName;    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */    wincl.cbSize = sizeof (WNDCLASSEX);    /* Use default icon and mouse-pointer */    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);    wincl.lpszMenuName = NULL;                 /* No menu */    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */    wincl.cbWndExtra = 0;                      /* structure or the window instance */    /* Use Windows's default colour as the background of the window */    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;    /* Register the window class, and if it fails quit the program */    if (!RegisterClassEx (&wincl))        return 0;    /* The class is registered, let's create the program*/    hwnd = CreateWindowEx (           0,                   /* Extended possibilites for variation */           szClassName,         /* Classname */           "Code::Blocks Template Windows App",       /* Title Text */           WS_OVERLAPPEDWINDOW, /* default window */           CW_USEDEFAULT,       /* Windows decides the position */           CW_USEDEFAULT,       /* where the window ends up on the screen */           544,                 /* The programs width */           375,                 /* and height in pixels */           HWND_DESKTOP,        /* The window is a child-window to desktop */           NULL,                /* No menu */           hThisInstance,       /* Program Instance handler */           NULL                 /* No Window Creation data */           );    /* Make the window visible on the screen */    ShowWindow (hwnd, nCmdShow);    /* Run the message loop. It will run until GetMessage() returns 0 */    while (GetMessage (&messages, NULL, 0, 0))    {        /* Translate virtual-key messages into character messages */        TranslateMessage(&messages);        /* Send message to WindowProcedure */        DispatchMessage(&messages);    }    /* The program return-value is 0 - The value that PostQuitMessage() gave */    return messages.wParam;}/*  This function is called by the Windows function DispatchMessage()  */LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){    switch (message)                  /* handle the messages */    {        case WM_DESTROY:            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */            break;        case WM_LBUTTONDOWN:            MessageBox(NULL, "欢迎进入Visual C++.NET!", "Hello", 0);        default:                      /* for messages that we don't deal with */            return DefWindowProc (hwnd, message, wParam, lParam);    }    return 0;}