Question

关于MFC的CFileDialog类的问题

CFileDialog dlg(FALSE,NULL,sFileName,0);
if(dlg.DoModal() == IDOK)
{

CString strFile = dlg.GetPathName(); // 全路径
int count = 1;
while( count )
{
if( DetectionFileExists(strFile) )//DetectionFileExists()检测某个文件，存在返回TRUE，不存在返回FLASE
{int i = MessageBox("已经有同名文件存在,覆盖原文件?","提示",MB_YESNO|MB_ICONQUESTION|MB_DEFBUTTON2) ;

if( i == 6 )
{
CFile::Remove(strFile); count = 0; }
if( i == 7 )
{ MessageBox("IDON"); }
}
/////////////////////////////////////////////////////////////////////////////////////////
我做了一个保存文件的对话框，里面有检测保存的文件是否存在的功能。如果文件存在就提示用户是否覆盖文件，问题就出在这里，用户选在了否 if( i == 7 )
{ MessageBox("IDON"); } 这里怎么写才能回到对话框供用户从新选择路径，

Answer 1

太复杂，CFileDialog本来就有个文件同名提示选项，
CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL );

OFN_OVERWRITEPROMPT?

Answer 2

问题是什么啊？

Answer 3

文件存在与否有FindFirstFile之类函数
干嘛用CFileDialog

Answer 4

CFileDialog 打开多个文件2006-12-01 17:28从CFileDialog派生一个类MFileDlg： 头文件：/////////////////////////////////////////////////////////////////////////////

// MFileDlg dialogclass MFileDlg : public CFileDialog

{

DECLARE_DYNAMIC(MFileDlg)public:

MFileDlg(BOOL bOpenFileDialog, // TRUE for FileOpen, FALSE for FileSaveAs

LPCTSTR lpszDefExt = NULL,

LPCTSTR lpszFileName = NULL,

DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,

LPCTSTR lpszFilter = NULL,

CWnd* pParentWnd = NULL);

int DoModal();

virtual ~MFileDlg();

protected:

//{{AFX_MSG(MFileDlg)

// NOTE - the ClassWizard will add and remove member functions here.

//}}AFX_MSG TCHAR* m_pszFile;

////////

DECLARE_MESSAGE_MAP()}; 类实现：/////////////////////////////////////////////////////////////////////////////

// MFileDlgIMPLEMENT_DYNAMIC(MFileDlg, CFileDialog)MFileDlg::MFileDlg(BOOL bOpenFileDialog, LPCTSTR lpszDefExt, LPCTSTR lpszFileName,

DWORD dwFlags, LPCTSTR lpszFilter, CWnd* pParentWnd) :

CFileDialog(bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags, lpszFilter, pParentWnd)

{

m_pszFile = new TCHAR[2048]; //set a 2K buffer to hold selected files

m_pszFile[0] = '\0'; //initialize pointer;

}

BEGIN_MESSAGE_MAP(MFileDlg, CFileDialog)

//{{AFX_MSG_MAP(MFileDlg)

// NOTE - the ClassWizard will add and remove mapping macros here.

//}}AFX_MSG_MAP

END_MESSAGE_MAP()MFileDlg::~MFileDlg()

{

if (m_pszFile != NULL)

delete [] m_pszFile; //cleanup

}int MFileDlg::DoModal()

{

ASSERT_VALID(this);

ASSERT(m_ofn.Flags & OFN_ALLOWMULTISELECT); //make sure multiple file selection is on m_ofn.lpstrFile = m_pszFile; //initialize the OPENFILENAME structure

m_ofn.nMaxFile = 2048;

return CFileDialog::DoModal();

} 具体使用： MFileDlg dlg( TRUE,_T("TXT"),_T("*.TXT"),

OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT|OFN_ALLOWMULTISELECT,

_T("文本文件 (*.txt)|*.txt所有文件 (*.*)|*.*|"));

if(dlg.DoModal()!=IDOK) return FALSE; //取消操作 POSITION pos = dlg.GetStartPosition();

while (pos != NULL)

{

CString strPath = dlg.GetNextPathName(pos);

if (strPath.Find(":\\\\") == 1 && strPath.GetLength() > 4)

{

// this means we have an invalid path that looks like this:

// C:\\cda.dgl

// get rid of extra slash

CString temp;

temp = strPath.Left(3);

temp += strPath.Mid(4);

strPath = temp;

}

m_listFileNames.AddTail(strPath); //CStringList m_listFileNames

TRACE(_T("GetOpenFileName returned %s Files\r\n"),strPath);

}