Windows编程
/*-------------------------------------------
POEPOEM.C -- Demonstrates Custom Resource
(c) Charles Petzold, 1998
-------------------------------------------*/

#include <windows.h>
#include "resource.h"

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

HINSTANCE hInst ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
TCHAR szAppName [16], szCaption [64], szErrMsg [64] ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

LoadString (hInstance, IDS_APPNAME, szAppName,
sizeof (szAppName) / sizeof (TCHAR)) ;

LoadString (hInstance, IDS_CAPTION, szCaption,
sizeof (szCaption) / sizeof (TCHAR)) ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (hInstance, szAppName) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
LoadStringA (hInstance, IDS_APPNAME, (char *) szAppName,
sizeof (szAppName)) ;

LoadStringA (hInstance, IDS_ERRMSG, (char *) szErrMsg,
sizeof (szErrMsg)) ;

MessageBoxA (NULL, (char *) szErrMsg,
(char *) szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, szCaption,
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

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

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static char * pText ;
static HGLOBAL hResource ;
static HWND hScroll ;
static int iPosition, cxChar, cyChar, cyClient, iNumLines, xScroll ;
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
TEXTMETRIC tm ;

switch (message)
{
case WM_CREATE :
hdc = GetDC (hwnd) ;
GetTextMetrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cyChar = tm.tmHeight + tm.tmExternalLeading ;
ReleaseDC (hwnd, hdc) ;

xScroll = GetSystemMetrics (SM_CXVSCROLL) ;

hScroll = CreateWindow (TEXT ("scrollbar"), NULL,
WS_CHILD | WS_VISIBLE | SBS_VERT,
0, 0, 0, 0,

hwnd, (HMENU) 1, hInst, NULL) ;

hResource = LoadResource (hInst,
FindResource (hInst, TEXT ("AnnabelLee"),
TEXT ("TEXT"))) ;

pText = (char *) LockResource (hResource) ;
iNumLines = 0 ;

while (*pText != '\\' && *pText != '\0')
{
if (*pText == '\n')
iNumLines ++ ;
pText = AnsiNext (pText) ;
}
*pText = '\0' ;

SetScrollRange (hScroll, SB_CTL, 0, iNumLines, FALSE) ;
SetScrollPos (hScroll, SB_CTL, 0, FALSE) ;
return 0 ;

case WM_SIZE :
MoveWindow (hScroll, LOWORD (lParam) - xScroll, 0,
xScroll, cyClient = HIWORD (lParam), TRUE) ;
SetFocus (hwnd) ;
return 0 ;

case WM_SETFOCUS :
SetFocus (hScroll) ;
return 0 ;

case WM_VSCROLL :
switch (wParam)
{
case SB_TOP :
iPosition = 0 ;
break ;
case SB_BOTTOM :
iPosition = iNumLines ;
break ;
case SB_LINEUP :
iPosition -= 1 ;
break ;
case SB_LINEDOWN :
iPosition += 1 ;
break ;
case SB_PAGEUP :
iPosition -= cyClient / cyChar ;
break ;
case SB_PAGEDOWN :
iPosition += cyClient / cyChar ;
break ;
case SB_THUMBPOSITION :
iPosition = LOWORD (lParam) ;
break ;
}
iPosition = max (0, min (iPosition, iNumLines)) ;

if (iPosition != GetScrollPos (hScroll, SB_CTL))
{
SetScrollPos (hScroll, SB_CTL, iPosition, TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
}
return 0 ;

case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;

pText = (char *) LockResource (hResource) ;

GetClientRect (hwnd, &rect) ;
rect.left += cxChar ;
rect.top += cyChar * (1 - iPosition) ;
DrawTextA (hdc, pText, -1, &rect, DT_EXTERNALLEADING) ;

EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY :
FreeResource (hResource) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
为什么提示Poepoem.c.exe 中的 0x00c81a2a 处有未经处理的异常: 0xC0000005: 读取位置 0x00000000 时发生访问冲突

[解决办法]
说明你访问了NULL指针指向的内存了，就是说你有个地方没判指针是否空就访问了
[解决办法]
建议单步调试，定位出错的那一行
------解决方案--------------------

首先代码没有问题，我用win7 x64 sp1(关UAC)+ vc6.0 sp6测试了。

估计是资源什么的缺少或者工程文件有错吧，建议直接使用下载原书中工程进行对比，找出问题