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CGopherFileFind Class

  • Стаття

Aids in Internet file searches of gopher servers.

Note

The classes CGopherConnection, CGopherFile, CGopherFileFind, CGopherLocator and their members have been deprecated because they do not work on the Windows XP platform, but they will continue to work on earlier platforms.

Syntax

class CGopherFileFind : public CFileFind

Members

Public Constructors

Name Description
CGopherFileFind::CGopherFileFind Constructs a CGopherFileFind object.

Public Methods

Name Description
CGopherFileFind::FindFile Finds a file on a gopher server.
CGopherFileFind::FindNextFile Continues a file search from a previous call to FindFile.
CGopherFileFind::GetCreationTime Gets the time the specified file was created.
CGopherFileFind::GetLastAccessTime Gets the time the specified file was last accessed.
CGopherFileFind::GetLastWriteTime Gets the time the specified file was last written to.
CGopherFileFind::GetLength Gets the length of the found file, in bytes.
CGopherFileFind::GetLocator Get a CGopherLocator object.
CGopherFileFind::GetScreenName Gets the name of a gopher screen.
CGopherFileFind::IsDots Tests for the current directory and parent directory markers while iterating through files.

Remarks

CGopherFileFind includes member functions that begin a search, locate a file, and return a file's URL.

Other MFC classes designed for Internet and local file searched include CFtpFileFind and CFileFind. Together with CGopherFileFind, these classes provide a seamless mechanism for the user to find specific files, regardless of the server protocol, file type, or location (either a local machine or a remote server.) Note that there is no MFC class for searching on HTTP servers because HTTP does not support the direct file manipulation required by searches.

Note

CGopherFileFind does not support the following member functions of its base class CFileFind:

In addition, when used with CGopherFileFind, the CFileFind member function IsDots is always FALSE.

For more information about how to use CGopherFileFind and the other WinInet classes, see the article Internet Programming with WinInet.

Inheritance Hierarchy

CObject

CFileFind

CGopherFileFind

Requirements

Header: afxinet.h

CGopherFileFind::CGopherFileFind

This member function is called to construct a CGopherFileFind object.

explicit CGopherFileFind(
    CGopherConnection* pConnection,
    DWORD_PTR dwContext = 1);

Parameters

pConnection
A pointer to a CGopherConnection object.

dwContext
The context identifier for the operation. See Remarks for more information about dwContext.

Remarks

The default value for dwContext is sent by MFC to the CGopherFileFind object from the CInternetSession object that created the CGopherFileFind object. When you construct a CGopherFileFind object, you can override the default to set the context identifier to a value of your choosing. The context identifier is returned to CInternetSession::OnStatusCallback to provide status on the object with which it is identified. See the article Internet First Steps: WinInet for more information about the context identifier.

CGopherFileFind::FindFile

Call this member function to find a gopher file.

virtual BOOL FindFile(
    CGopherLocator& refLocator,
    LPCTSTR pstrString,
    DWORD dwFlags = INTERNET_FLAG_RELOAD);

virtual BOOL FindFile(
    LPCTSTR pstrString,
    DWORD dwFlags = INTERNET_FLAG_RELOAD);

Parameters

refLocator
A reference to a CGopherLocator object.

pstrString
A pointer to a string containing the file name.

dwFlags
The flags describing how to handle this session. The valid flags are:

  • INTERNET_FLAG_RELOAD Get the data from the remote server even if it is locally cached.

  • INTERNET_FLAG_DONT_CACHE Do not cache the data, either locally or in any gateways.

  • INTERNET_FLAG_SECURE Request secure transactions on the wire with Secure Sockets Layer or PCT. This flag is applicable to HTTP requests only.

  • INTERNET_FLAG_USE_EXISTING If possible, reuse the existing connections to the server for new FindFile requests, instead of creating a new session for each request.

Return Value

Nonzero if successful; otherwise 0. To get extended error information, call the Win32 function GetLastError.

Remarks

After calling FindFile to retrieve the first gopher object, you can call FindNextFile to retrieve subsequent gopher files.

CGopherFileFind::FindNextFile

Call this member function to continue a file search begun with a call to CGopherFileFind::FindFile.

virtual BOOL FindNextFile();

Return Value

Nonzero if there are more files; zero if the file found is the last one in the directory or if an error occurred. To get extended error information, call the Win32 function GetLastError. If the file found is the last file in the directory, or if no matching files can be found, the GetLastError function returns ERROR_NO_MORE_FILES.

CGopherFileFind::GetCreationTime

Gets the creation time for the current file.

virtual BOOL GetCreationTime(FILETIME* pTimeStamp) const;
virtual BOOL GetCreationTime(CTime& refTime) const;

Parameters

pTimeStamp
A pointer to a FILETIME structure containing the time the file was created.

refTime
A reference to a CTime object.

Return Value

Nonzero if successful; 0 if unsuccessful. GetCreationTime returns 0 only if FindNextFile has never been called on this CGopherFileFind object.

Remarks

You must call FindNextFile at least once before calling GetCreationTime.

Note

Not all file systems use the same semantics to implement the time stamp returned by this function. This function may return the same value returned by other time stamp functions if the underlying file system or server does not support keeping the time attribute. See the WIN32_FIND_DATA structure for information about time formats. On some operating systems, the returned time is in the time zone local to the machine were the file is located. See the Win32 FileTimeToLocalFileTime API for more information.

CGopherFileFind::GetLastAccessTime

Gets the time the specified file was last accessed.

virtual BOOL GetLastAccessTime(CTime& refTime) const;
virtual BOOL GetLastAccessTime(FILETIME* pTimeStamp) const;

Parameters

refTime
A reference to a CTime object.

pTimeStamp
A pointer to a FILETIME structure containing the time the file was last accessed.

Return Value

Nonzero if successful; 0 if unsuccessful. GetLastAccessTime returns 0 only if FindNextFile has never been called on this CGopherFileFind object.

Remarks

You must call FindNextFile at least once before calling GetLastAccessTime.

Note

Not all file systems use the same semantics to implement the time stamp returned by this function. This function may return the same value returned by other time stamp functions if the underlying file system or server does not support keeping the time attribute. See the WIN32_FIND_DATA structure for information about time formats. On some operating systems, the returned time is in the time zone local to the machine were the file is located. See the Win32 FileTimeToLocalFileTime API for more information.

CGopherFileFind::GetLastWriteTime

Gets the last time the file was changed.

virtual BOOL GetLastWriteTime(FILETIME* pTimeStamp) const;
virtual BOOL GetLastWriteTime(CTime& refTime) const;

Parameters

pTimeStamp
A pointer to a FILETIME structure containing the time the file was last written to.

refTime
A reference to a CTime object.

Return Value

Nonzero if successful; 0 if unsuccessful. GetLastWriteTime returns 0 only if FindNextFile has never been called on this CGopherFileFind object.

Remarks

You must call FindNextFile at least once before calling GetLastWriteTime.

Note

Not all file systems use the same semantics to implement the time stamp returned by this function. This function may return the same value returned by other time stamp functions if the underlying file system or server does not support keeping the time attribute. See the WIN32_FIND_DATA structure for information about time formats. On some operating systems, the returned time is in the time zone local to the machine were the file is located. See the Win32 FileTimeToLocalFileTime API for more information.

CGopherFileFind::GetLength

Call this member function to get the length, in bytes, of the found file.

virtual ULONGLONG GetLength() const;

Return Value

The length, in bytes, of the found file.

Remarks

GetLength uses the Win32 structure WIN32_FIND_DATA to get the value of the file size in bytes.

Note

As of MFC 7.0, GetLength supports 64-bit integer types. Previously-existing code built with this newer version of the library may result in truncation warnings.

Example

See the example for CFile::GetLength (the base class implementation).

CGopherFileFind::GetLocator

Call this member function to get the CGopherLocator object that FindFile uses to find the gopher file.

CGopherLocator GetLocator() const;

Return Value

A CGopherLocator object.

CGopherFileFind::GetScreenName

Call this member function to get the name of the gopher screen.

CString GetScreenName() const;

Return Value

The name of the gopher screen.

CGopherFileFind::IsDots

Tests for the current directory and parent directory markers while iterating through files.

virtual BOOL IsDots() const;

Return Value

Nonzero if the found file has the name "." or "..", which indicates that the found file is actually a directory. Otherwise 0.

Remarks

You must call FindNextFile at least once before calling IsDots.

See also

CFileFind Class
Hierarchy Chart
CFtpFileFind Class
CFileFind Class
CInternetFile Class
CGopherFile Class
CHttpFile Class