请教高手一个编译没问题，运行报错的问题！！

[kevintenny]

// tzy4.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "windows.h"
//定义全局变量和函数
HINSTANCE hInst;
HINSTANCE hInstance;
MSG msg;
char lpszClassName[]="window_class";
char *ShowText;
//声明函数原型
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); //窗口函数
void OnLButtonDown(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
void OnPaint(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
void OnDestroy(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
//声明窗口类
class CFrameWnd
{
public:
HWND hWnd;
public:
int RegisterWindow();
void Create(LPCTSTR lpClassName,LPCTSTR lpWindowName);
void ShowWindow(int nCmdShow);
void UpdateWindow();
};
//窗口类成员函数的实现
int CFrameWnd::RegisterWindow()
{
WNDCLASS wc;
wc.style=0;
wc.lpfnWndProc=WndProc;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hInstance=hInstance;
wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wc.hCursor=LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszClassName=NULL;
wc.lpszClassName=lpszClassName;
return RegisterClass(&wc);
}
void CFrameWnd::Create(LPCTSTR lpClassName,LPCTSTR lpWindowName)
{
RegisterWindow();
hInst=hInstance;
hWnd=CreateWindow(lpszClassName,lpWindowName,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,
0,CW_USEDEFAULT,0,NULL,NULL,hInstance,NULL);
}
void CFrameWnd::ShowWindow(int nCmdShow)
{
::ShowWindow(hWnd,nCmdShow);
}
void CFrameWnd::UpdateWindow()
{
::UpdateWindow(hWnd);
}

//声明应用程序类
class CWinApp
{
public:
CFrameWnd *m_pMainWnd;
public:
BOOL InitInstance(int nCmdShow);
int Run();
~CWinApp();
};
//应用程序类成员函数的实现
BOOL CWinApp::InitInstance(int nCmdShow)
{
m_pMainWnd=new CFrameWnd;
m_pMainWnd->Create(NULL,"封装的Window程序");
m_pMainWnd->ShowWindow(nCmdShow);
m_pMainWnd->UpdateWindow();
return TRUE;
}
int CWinApp::Run()
{
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
CWinApp::~CWinApp()
{
delete m_pMainWnd;
}

//程序员定义的WinApp对象theApp
CWinApp theApp;
//主函数

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
int ResultCode=-1;
theApp.InitInstance(nCmdShow);
return ResultCode=theApp.Run();
}
//窗口函数的实现
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_LBUTTONDOWN:
OnLButtonDown(hWnd,message,wParam,lParam);
break;
case WM_PAINT:
OnPaint(hWnd,message,wParam,lParam);
break;
case WM_DESTROY:
OnDestroy(hWnd,message,wParam,lParam);
break;
default:
return DefWindowProc(hWnd,message,wParam,lParam);
}
return 0;
}
void OnLButtonDown(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
ShowText="Hello!";
InvalidateRect(hWnd,NULL,1);
}
void OnPaint(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
hdc=BeginPaint(hWnd,&ps);
TextOut(hdc,50,50,ShowText,6);
EndPaint(hWnd,&ps);
}
void OnDestroy(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
PostQuitMessage(0);
}

这个程序我编译没有问题，但是运行的时候报：
"0x77e3a3fe"指令引用的"0xcccccccc"内存。该内存不能为"read"

请哪位高手指点一下怎么回事？

[快乐鹦鹉]

除了调试，没有办法。
自己加断点跟踪错误在哪一句，才能具体分析。

[tufaqing]

char *ShowText = "";

[yzcurry]

ShowText这个变量是char指针的，你要为它声请空间的，要不是没有办法用的

[向立天]

看这
int CFrameWnd::RegisterWindow()
{
WNDCLASS wc;
wc.style=0;
wc.lpfnWndProc=WndProc;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hInstance=hInstance;
wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wc.hCursor=LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszClassName=NULL;
wc.lpszClassName=lpszClassName;
return RegisterClass(&wc);
}
红色部分应该是

wc.lpszMenuName	= NULL;

编程要认真