送出100分!关于文件保存的问题,急!

[zgjszj]

我在多文档界面中定义了一个文件保存函数,代码如下:
void CControlView::OnFileSave2()
{
CFileDialog dlg(FALSE,"",NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,"控制文件(*.*)|*.*|",NULL);
if(dlg.DoModal()==IDOK)
{
CCONTROLDoc * pDoc=GetDocument();
UpdateData(TRUE);
CFile f;
VERIFY(f.Open(dlg.GetPathName(),CFile::modeCreate|CFile::modeWrite));
CArchive ar(&f,CArchive::store);
GetDlgItem(IDC_EDIT1)->GetWindowText(constr[0]);
constr[0]="$PROBLEM "+constr[0]+"\r\n";
ar.WriteString(constr[0]);
constr[1]="$INPUT";
if(m_idchk==TRUE)
constr[1]=constr[1]+" ID";
if(m_timechk==TRUE)
constr[1]=constr[1]+" TIME";
if(m_amtchk==TRUE)
constr[1]=constr[1]+" AMT";
if(m_wtchk==TRUE)
constr[1]=constr[1]+" WT";
if(m_apgrchk==TRUE)
constr[1]=constr[1]+" APGR";
if(m_dvchk==TRUE)
constr[1]=constr[1]+" DV";
constr[1]=constr[1]+"\r\n";
ar.WriteString(constr[1]);
pDoc->SetPathName(dlg.GetPathName());
ar.Close();
f.Close();
}
}

点击菜单中的"保存"能正常保存文件,但有一点问题:当我打开一个已保存的文件例如cf,修改后再点"保存",程序又弹出保存对话框,如果我输入文件名cf1,还是能成功保存.但是按道理说不应该再弹出保存对话框的,应该直接保存到文件cf1中.请问各位大侠,该如何解决这个问题?

[goodboyws]

改成这样
CString strPath = GetDocument()->GetPathName();
if (strPath == "")
{
CFileDialog dlg(FALSE,"",NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,"控制文件(*.*)|*.*|",NULL);
if(dlg.DoModal()==IDOK)
{
strPath == dlg.GetPathName();
pDoc->SetPathName(dlg.GetPathName());
}
}
if (strPath != "")
{
CCONTROLDoc * pDoc=GetDocument();
UpdateData(TRUE);
CFile f;
VERIFY(f.Open(strPath ,CFile::modeCreate|CFile::modeWrite));
CArchive ar(&f,CArchive::store);
GetDlgItem(IDC_EDIT1)->GetWindowText(constr[0]);
constr[0]="$PROBLEM "+constr[0]+"\r\n";
ar.WriteString(constr[0]);
constr[1]="$INPUT";
if(m_idchk==TRUE)
constr[1]=constr[1]+" ID";
if(m_timechk==TRUE)
constr[1]=constr[1]+" TIME";
if(m_amtchk==TRUE)
constr[1]=constr[1]+" AMT";
if(m_wtchk==TRUE)
constr[1]=constr[1]+" WT";
if(m_apgrchk==TRUE)
constr[1]=constr[1]+" APGR";
if(m_dvchk==TRUE)
constr[1]=constr[1]+" DV";
constr[1]=constr[1]+"\r\n";
ar.WriteString(constr[1]);

ar.Close();
f.Close();

}

[dasiu]

自动保存到制定位置，需要你在程序里面处理。
例如，在第一次弹出对话框保存后，利用变量保存保存文件路径和名称；
在再次按下保存的时候，利用原来的路径和名称，直接保存而不弹出对话框。

[一条晚起的虫]

OFN_OVERWRITEPROMPT
Causes the Save As dialog box to generate a message box if the selected file already exists. The user must confirm whether to overwrite the file.

你在建CFileDialog 的时候，选的参数就是这样的

[一条晚起的虫]

改成 OFN_HIDEREADONLY | ~OFN_OVERWRITEPROMPT

[ihavenoidea]

用序列化~

你这样当然是每次都打开了~

[qrlvls]

你使用的是自定义的保存函数，与默认的框架结构中的函数的处理过程是不同的

[qrlvls]

CDocument *pDoc;

strFile = pDoc->GetPathName();
if (strFile == _T(""))
{
弹出文件对话框
strFile = dlgFileOpen.GetPathName();
}

CCONTROLDoc * pDoc=GetDocument();
UpdateData(TRUE);
CFile f;
VERIFY(f.Open(dlg.GetPathName(),CFile::modeCreate|CFile::modeWrite));
CArchive ar(&f,CArchive::store);
GetDlgItem(IDC_EDIT1)->GetWindowText(constr[0]);
constr[0]="$PROBLEM "+constr[0]+"\r\n";
ar.WriteString(constr[0]);
constr[1]="$INPUT";
if(m_idchk==TRUE)
constr[1]=constr[1]+" ID";
if(m_timechk==TRUE)
constr[1]=constr[1]+" TIME";
if(m_amtchk==TRUE)
constr[1]=constr[1]+" AMT";
if(m_wtchk==TRUE)
constr[1]=constr[1]+" WT";
if(m_apgrchk==TRUE)
constr[1]=constr[1]+" APGR";
if(m_dvchk==TRUE)
constr[1]=constr[1]+" DV";
constr[1]=constr[1]+"\r\n";
ar.WriteString(constr[1]);
pDoc->SetPathName(dlg.GetPathName());
ar.Close();
f.Close();
}

[ihavenoidea]

在 文档类里~ 序列化你的数据

[qrlvls]

现在参考一下 MFC 自身的处理过程：
BOOL CDocument::DoSave(LPCTSTR lpszPathName, BOOL bReplace)
// Save the document data to a file
// lpszPathName = path name where to save document file
// if lpszPathName is NULL then the user will be prompted (SaveAs)
// note: lpszPathName can be different than 'm_strPathName'
// if 'bReplace' is TRUE will change file name if successful (SaveAs)
// if 'bReplace' is FALSE will not change path name (SaveCopyAs)
{
CString newName = lpszPathName;
if (newName.IsEmpty())
{
CDocTemplate* pTemplate = GetDocTemplate();
ASSERT(pTemplate != NULL);

newName = m_strPathName;
if (bReplace && newName.IsEmpty())
{
newName = m_strTitle;
// check for dubious filename
int iBad = newName.FindOneOf(_T(" #%;/\\"));
if (iBad != -1)
newName.ReleaseBuffer(iBad);

// append the default suffix if there is one
CString strExt;
if (pTemplate->GetDocString(strExt, CDocTemplate::filterExt) &&
!strExt.IsEmpty())
{
ASSERT(strExt[0] == '.');
newName += strExt;
}
}

if (!AfxGetApp()->DoPromptFileName(newName,
bReplace ? AFX_IDS_SAVEFILE : AFX_IDS_SAVEFILECOPY,
OFN_HIDEREADONLY | OFN_PATHMUSTEXIST, FALSE, pTemplate))
return FALSE; // don't even attempt to save
}

CWaitCursor wait;

if (!OnSaveDocument(newName))
{
if (lpszPathName == NULL)
{
// be sure to delete the file
TRY
{
CFile::Remove(newName);
}
CATCH_ALL(e)
{
TRACE0("Warning: failed to delete file after failed SaveAs.\n");
DELETE_EXCEPTION(e);
}
END_CATCH_ALL
}
return FALSE;
}

// reset the title and change the document name
if (bReplace)
SetPathName(newName);

return TRUE; // success
}

[laolaoliu2002]

把OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT改掉具体的可以看MSDN.

[qrlvls]

现在参考一下 MFC 自身的处理过程：
BOOL CDocument::DoSave(LPCTSTR lpszPathName, BOOL bReplace)
// Save the document data to a file
// lpszPathName = path name where to save document file
// if lpszPathName is NULL then the user will be prompted (SaveAs)
// note: lpszPathName can be different than 'm_strPathName'
// if 'bReplace' is TRUE will change file name if successful (SaveAs)
// if 'bReplace' is FALSE will not change path name (SaveCopyAs)
{
CString newName = lpszPathName;
if (newName.IsEmpty())
{
CDocTemplate* pTemplate = GetDocTemplate();
ASSERT(pTemplate != NULL);

newName = m_strPathName;
if (bReplace && newName.IsEmpty())
{
newName = m_strTitle;
// check for dubious filename
int iBad = newName.FindOneOf(_T(" #%;/\\"));
if (iBad != -1)
newName.ReleaseBuffer(iBad);

// append the default suffix if there is one
CString strExt;
if (pTemplate->GetDocString(strExt, CDocTemplate::filterExt) &&
!strExt.IsEmpty())
{
ASSERT(strExt[0] == '.');
newName += strExt;
}
}

if (!AfxGetApp()->DoPromptFileName(newName,
bReplace ? AFX_IDS_SAVEFILE : AFX_IDS_SAVEFILECOPY,
OFN_HIDEREADONLY | OFN_PATHMUSTEXIST, FALSE, pTemplate))
return FALSE; // don't even attempt to save
}

CWaitCursor wait;

if (!OnSaveDocument(newName))
{
if (lpszPathName == NULL)
{
// be sure to delete the file
TRY
{
CFile::Remove(newName);
}
CATCH_ALL(e)
{
TRACE0("Warning: failed to delete file after failed SaveAs.\n");
DELETE_EXCEPTION(e);
}
END_CATCH_ALL
}
return FALSE;
}

// reset the title and change the document name
if (bReplace)
SetPathName(newName);

return TRUE; // success
}