windows 程序设计第5版的第十章的一个程序在win7下正常,win10下运行出错
本帖最后由 combit 于 2019-11-1 16:31 编辑\\PoePoem
#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 , szCaption , szErrMsg ;
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' ;
//这个地方有问题,Win10下要注释掉,否则运行出错,错误好像是内存不能写,但在Win7下正常
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) ;
}
第104行的代码有问题,不知道这是什么原因呢?开发环境是vs2019 测试在xp下正常,但在win10下出错。
把*pText = '\0' ; 一行注释掉。
并且把WM_PAINT下的 DrawTextA (hdc, pText, -1, &rect, DT_EXTERNALLEADING) ;一行 换成下面两行就可以了:
HRSRC hResInfo = FindResource(hInst, TEXT("AnnabelLee"), TEXT("TEXT"));
DrawTextA(hdc, pText, SizeofResource(hInst, hResInfo), &rect, DT_EXTERNALLEADING);
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