您好我已经将VC ++ 6项目转换为VC ++ 2010并且在显示模态打开文件对话框时遇到错误。
它显示对话框的底部但缺少顶部，也没有填充过滤器。
标头包含用于存储文件信息的公共成员：
CString m_strFilePathName;
CString m_strFileExtName;
我的代码显示对话框：
static TCHAR BASED_CODE szFilter[] = _T("Open Bin File(*.abs)|")
_T("Default DataBase File(*.ddf)|")
_T("SatCodex File(*.sdx)|")
_T("Format Text File(*.txt)");
// TODO: Add your command handler code here
CFileDlg fd(TRUE, NULL, "", OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, szFilter);
//"Open Bin File(*.abs)|Default DataBase File(*.ddf)|SatCodex File(*.sdx)|Format Text File(*.txt)");
const int c_cMaxFiles = 1;
const int c_cbBuffSize = (c_cMaxFiles * (MAX_PATH + 1)) + 1;
fd.GetOFN().lpstrFile = m_strFilePathName.GetBuffer(c_cbBuffSize);
fd.GetOFN().nMaxFile = c_cbBuffSize;
// Dialog hangs on this line:
if(fd.DoModal() != IDOK) return;
诊断返回： AliEditor.exe中0x006c69cc处的第一次机会异常：0xC0000005：访问冲突读取位置0x00000020。
在挂起模式下断开调用堆栈会返回以下信息：
user32.dll!_NtUserWaitMessage@0() + 0x15 bytes <-STOPPED HERE
user32.dll!_NtUserWaitMessage@0() + 0x15 bytes
user32.dll!_DialogBox2@16() + 0x109 bytes
user32.dll!_InternalDialogBox@24() + 0xc9 bytes
user32.dll!_DialogBoxIndirectParamAorW@24() + 0x36 bytes
user32.dll!_DialogBoxIndirectParamW@20() + 0x1b bytes
comdlg32.dll!CFileOpenSave::Show() + 0x146 bytes
AliEditor.exe！CFileDialog :: DoModal（）第748行+ 0x26字节C ++ AliEditor.exe！CMainFrame :: OnFileOpen（）第195行+ 0xb字节C ++ AliEditor.exe！_AfxDispatchCmdMsg（CCmdTarget * pTarget，unsigned int nID，int nCode，void（void）* pfn，void * pExtra，unsigned int nSig，AFX_CMDHANDLERINFO * pHandlerInfo）第82行C ++ AliEditor.exe！CCmdTarget :: OnCmdMsg（unsigned int nID，int nCode，void * pExtra，AFX_CMDHANDLERINFO * pHandlerInfo）381行+ 0x27字节C ++ AliEditor.exe！CFrameWnd :: OnCmdMsg（unsigned int nID，int nCode，void * pExtra，AFX_CMDHANDLERINFO * pHandlerInfo）Line 973 + 0x18 bytes C ++ AliEditor.exe！CWnd :: OnCommand（unsigned int wParam，long lParam）第2729行C ++ AliEditor.exe！CFrameWnd :: OnCommand（unsigned int wParam，long lParam）第371行C ++ AliEditor.exe！CWnd :: OnWndMsg（unsigned int message，unsigned int wParam，long lParam，long * pResult）Line 2101 + 0x1e bytes C ++ AliEditor.exe！CWnd :: WindowProc（unsigned int message，unsigned int wParam，long lParam）2087行+ 0x20字节C ++ AliEditor.exe！AfxCallWndProc（CWnd * pWnd，HWND__ * hWnd，unsigned int nMsg，unsigned int wParam，long lParam）第257行+ 0x1c字节C ++ AliEditor.exe！AfxWndProc（HWND__ * hWnd，unsigned int nMsg，unsigned int wParam，long lParam）Line 420 C ++
我猜的声明（我不是C ++开发人员）覆盖（fileDlg.cpp）：
#include "stdafx.h"
#include "AliEditor.h"
#include "FileDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CFileDlg
IMPLEMENT_DYNAMIC(CFileDlg, CFileDialog)
CFileDlg::CFileDlg(BOOL bOpenFileDialog, LPCTSTR lpszDefExt, LPCTSTR lpszFileName,
DWORD dwFlags, LPCTSTR lpszFilter, CWnd* pParentWnd) :
CFileExportDialog(bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags, lpszFilter, pParentWnd)
{
}
BEGIN_MESSAGE_MAP(CFileDlg, CFileExportDialog)
//{{AFX_MSG_MAP(CFileDlg)
ON_WM_CLOSE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
文件“dlgfile.cpp”非常大，但这只是顶部：
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#include <dlgs.h> // for standard control IDs for commdlg
#include "afxglobals.h"
#define new DEBUG_NEW
////////////////////////////////////////////////////////////////////////////
// FileOpen/FileSaveAs common dialog helper
CFileDialog::CFileDialog(BOOL bOpenFileDialog,
LPCTSTR lpszDefExt, LPCTSTR lpszFileName, DWORD dwFlags,
LPCTSTR lpszFilter, CWnd* pParentWnd, DWORD dwSize, BOOL bVistaStyle)
: CCommonDialog(pParentWnd)
{
OSVERSIONINFO vi;
ZeroMemory(&vi, sizeof(OSVERSIONINFO));
vi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
::GetVersionEx(&vi);
// if running under Vista
if (vi.dwMajorVersion >= 6)
{
m_bVistaStyle = bVistaStyle;
}
else
{
m_bVistaStyle = FALSE;
}
m_bPickFoldersMode = FALSE;
// determine size of OPENFILENAME struct if dwSize is zero
if (dwSize == 0)
{
dwSize = sizeof(OPENFILENAME);
}
// size of OPENFILENAME must be at least version 5
ASSERT(dwSize >= sizeof(OPENFILENAME));
// allocate memory for OPENFILENAME struct based on size passed in
m_pOFN = static_cast<LPOPENFILENAME>(malloc(dwSize));
ASSERT(m_pOFN != NULL);
if (m_pOFN == NULL)
AfxThrowMemoryException();
memset(&m_ofn, 0, dwSize); // initialize structure to 0/NULL
m_szFileName[0] = '\0';
m_szFileTitle[0] = '\0';
m_pofnTemp = NULL;
m_bOpenFileDialog = bOpenFileDialog;
m_nIDHelp = bOpenFileDialog ? AFX_IDD_FILEOPEN : AFX_IDD_FILESAVE;
m_ofn.lStructSize = dwSize;
m_ofn.lpstrFile = m_szFileName;
m_ofn.nMaxFile = _countof(m_szFileName);
m_ofn.lpstrDefExt = lpszDefExt;
m_ofn.lpstrFileTitle = (LPTSTR)m_szFileTitle;
m_ofn.nMaxFileTitle = _countof(m_szFileTitle);
m_ofn.Flags |= dwFlags | OFN_ENABLEHOOK | OFN_EXPLORER;
if(dwFlags & OFN_ENABLETEMPLATE)
m_ofn.Flags &= ~OFN_ENABLESIZING;
m_ofn.hInstance = AfxGetResourceHandle();
m_ofn.lpfnHook = (COMMDLGPROC)_AfxCommDlgProc;
// setup initial file name
if (lpszFileName != NULL)
Checked::tcsncpy_s(m_szFileName, _countof(m_szFileName), lpszFileName, _TRUNCATE);
// Translate filter into commdlg format (lots of \0)
if (lpszFilter != NULL)
{
m_strFilter = lpszFilter;
LPTSTR pch = m_strFilter.GetBuffer(0); // modify the buffer in place
// MFC delimits with '|' not '\0'
while ((pch = _tcschr(pch, '|')) != NULL)
*pch++ = '\0';
m_ofn.lpstrFilter = m_strFilter;
// do not call ReleaseBuffer() since the string contains '\0' characters
}
if (m_bVistaStyle == TRUE)
{
if (SUCCEEDED(CoInitializeEx(NULL, COINIT_APARTMENTTHREADED)))
{ // multi-threaded is not supported
IFileDialog* pIFileDialog;
IFileDialogCustomize* pIFileDialogCustomize;
HRESULT hr;
USE_INTERFACE_PART_STD(FileDialogEvents);
USE_INTERFACE_PART_STD(FileDialogControlEvents);
if (m_bOpenFileDialog)
{
hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&pIFileDialog));
}
else
{
hr = CoCreateInstance(CLSID_FileSaveDialog, NULL, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&pIFileDialog));
}
if (FAILED(hr))
{
m_bVistaStyle = FALSE;
return;
}
hr = pIFileDialog->QueryInterface(IID_PPV_ARGS(&pIFileDialogCustomize));
ENSURE(SUCCEEDED(hr));
hr = pIFileDialog->Advise(reinterpret_cast<IFileDialogEvents*>(&m_xFileDialogEvents), &m_dwCookie);
ENSURE(SUCCEEDED(hr));
m_pIFileDialog = static_cast<void*>(pIFileDialog);
m_pIFileDialogCustomize = static_cast<void*>(pIFileDialogCustomize);
}
else
{
m_bVistaStyle = FALSE;
}
}
}
CFileDialog::~CFileDialog()
{
free(m_pOFN);
if (m_bVistaStyle == TRUE)
{
HRESULT hr;
hr = (static_cast<IFileDialog*>(m_pIFileDialog))->Unadvise(m_dwCookie);
ENSURE(SUCCEEDED(hr));
(static_cast<IFileDialogCustomize*>(m_pIFileDialogCustomize))->Release();
(static_cast<IFileDialog*>(m_pIFileDialog))->Release();
CoUninitialize();
}
}
const OPENFILENAME& CFileDialog::GetOFN() const
{
return *m_pOFN;
}
OPENFILENAME& CFileDialog::GetOFN()
{
return *m_pOFN;
}
一步一步走到同一个（“dlgfile.cpp”）文件的这一点：
INT_PTR CFileDialog::DoModal()
{
ASSERT_VALID(this);
ASSERT(m_ofn.Flags & OFN_ENABLEHOOK);
ASSERT(m_ofn.lpfnHook != NULL); // can still be a user hook
// zero out the file buffer for consistent parsing later
ASSERT(AfxIsValidAddress(m_ofn.lpstrFile, m_ofn.nMaxFile));
DWORD nOffset = lstrlen(m_ofn.lpstrFile)+1;
ASSERT(nOffset <= m_ofn.nMaxFile);
memset(m_ofn.lpstrFile+nOffset, 0, (m_ofn.nMaxFile-nOffset)*sizeof(TCHAR));
// This is a special case for the file open/save dialog,
// which sometimes pumps while it is coming up but before it has
// disabled the main window.
HWND hWndFocus = ::GetFocus();
BOOL bEnableParent = FALSE;
m_ofn.hwndOwner = PreModal();
AfxUnhookWindowCreate();
if (m_ofn.hwndOwner != NULL && ::IsWindowEnabled(m_ofn.hwndOwner))
{
bEnableParent = TRUE;
::EnableWindow(m_ofn.hwndOwner, FALSE);
}
_AFX_THREAD_STATE* pThreadState = AfxGetThreadState();
ASSERT(pThreadState->m_pAlternateWndInit == NULL);
if (m_bVistaStyle == TRUE)
{
AfxHookWindowCreate(this);
}
else if (m_ofn.Flags & OFN_EXPLORER)
pThreadState->m_pAlternateWndInit = this;
else
AfxHookWindowCreate(this);
INT_PTR nResult = 0;
if (m_bVistaStyle == TRUE)
{
ApplyOFNToShellDialog();
// HERE CALLS **OPENFILENAME& CFileDialog::GetOFN()** method and then hangs
HRESULT hr = (static_cast<IFileDialog*>(m_pIFileDialog))->Show(m_ofn.hwndOwner);
nResult = (hr == S_OK) ? IDOK : IDCANCEL;
}
else if (m_bOpenFileDialog)
nResult = ::AfxCtxGetOpenFileName(&m_ofn);
else
nResult = ::AfxCtxGetSaveFileName(&m_ofn);
if (nResult)
ASSERT(pThreadState->m_pAlternateWndInit == NULL);
pThreadState->m_pAlternateWndInit = NULL;
// Second part of special case for file open/save dialog.
if (bEnableParent)
::EnableWindow(m_ofn.hwndOwner, TRUE);
if (::IsWindow(hWndFocus))
::SetFocus(hWndFocus);
PostModal();
return nResult ? nResult : IDCANCEL;
}
有人可以帮助我吗？
[更新] 由于现阶段没有人可以帮助我，我已将项目上传到公共场所here。当我点击打开文件时，有人可以下载并告诉我出了什么问题吗？
答案 0 :(得分：5)
我能看到的唯一问题是你的过滤字符串看起来不正确。看起来您的代码基于MSDN示例之一。根据该示例，您的szFilter应如下所示：
static TCHAR BASED_CODE szFilter[] = _T("Open Bin File(*.abs)|*.abs|")
_T("Default DataBase File(*.ddf)|*.ddf|")
_T("SatCodex File(*.sdx)|*.sdx|")
_T("Format Text File(*.txt)|*.txt||");
仅供参考我使用http://msdn.microsoft.com/en-US/library/wh5hz49d(v=vs.100).aspx作为参考。
[更新]
我创建了一个小型MFC应用并粘贴在您的代码中。您的代码示例中存在拼写错误。该类是CFileDialog，而不是CFileDlg。我修复它，然后应用上述更改来修复szFilter字符串。这个对我有用。显示文件对话框，我输入一些数据并关闭文件对话框。没有访问冲突，没有断言。我认为您需要查看代码中的其他位置以跟踪问题。
[更新2]
忽略我之前说的一切。您的原始访问冲突是在FileExportDialog.cpp
的第174行附近void CFileExportDialog::OnTypeChange()
{
// get current filename
CWnd *fileNameBox = GetParent()->GetDlgItem(edt1);
ASSERT_VALID(fileNameBox);
CString fileName; fileNameBox->GetWindowText(fileName);
// get current extension
CWnd *typeNameBox = GetParent()->GetDlgItem(cmb1);
ASSERT_VALID(typeNameBox);
CString typeName; typeNameBox->GetWindowText(typeName);
...
真正的调用堆栈是：
AliEditor.exe!CWnd::GetDlgItem(int nID) Line 92 + 0x3 bytes C++
AliEditor.exe!CFileExportDialog::OnTypeChange() Line 177 + 0x14 bytes C++
AliEditor.exe!CFileDialog::XFileDialogEvents::OnTypeChange(IFileDialog * __formal) Line 619 C++
comdlg32.dll!76138057()
[Frames below may be incorrect and/or missing, no symbols loaded for comdlg32.dll]
comctl32.dll!731c7613()
comdlg32.dll!7612bdda()
comdlg32.dll!7612c5a0()
KernelBase.dll!76096055()
comctl32.dll!7458b575()
user32.dll!767281c8()
user32.dll!76728326()
user32.dll!76728347()
user32.dll!76730d27()
user32.dll!7673794a()
AliEditor.exe!_AfxActivationWndProc(HWND__ * hWnd, unsigned int nMsg, unsigned int wParam, long lParam) Line 456 + 0x1a bytes C++
user32.dll!767262fa()
user32.dll!76726d3a()
user32.dll!76726ce9()
user32.dll!7672965e()
user32.dll!7675206f()
user32.dll!7674cf4b()
user32.dll!7674ce8a()
user32.dll!7674cc0e()
comdlg32.dll!7612597b()
AliEditor.exe!CFileDialog::DoModal() Line 748 + 0x26 bytes C++
...
程序在CWnd :: GetDlgItem崩溃，因为CWnd“this”指针为0.这是因为CFileExportDialog :: OnTypeChange的第一行是GetParent（），它是NULL，因为此对话框没有父对象。
类CFileExportDialog不是Visual Studio的一部分，它似乎基于1999年从http://www.codeguru.com/cpp/w-d/dislog/commondialogs/article.php/c1863/CFileExportDialog-Class.htm编写的一些公共域代码。看起来OnTypeChange的实现基于原始开发人员对1999年实现的Microsoft CFileDialog类的详细信息进行逆向工程。我猜测VS 2010中的内部结构发生了变化，因此类不再有用。
下次运行程序时，在FileExportDialog.cpp的第177行设置断点。当您点击断点时，单步执行代码并观察崩溃并断言，因为过时的代码会尝试执行它本来不应该做的事情。
建议您转储CFileExportDialog类并使用标准MFC CFileDialog类重写您的程序。