FtpFindFirstFile

  • 项目

This function searches the specified directory of the specified FTP session. File and directory entries are returned to the application in the WIN32_FIND_DATA structure.

HINTERNET FtpFindFirstFile(
  HINTERNET hConnect, 
  LPCTSTR lpszSearchFile, 
  LPWIN32_FIND_DATA lpFindFileData, 
  DWORD dwFlags, 
  DWORD dwContext
);

Parameters

  • hConnect
    [in] Valid handle to an FTP session returned by the InternetConnect function.
  • lpszSearchFile
    [in] Long pointer to a null-terminated string that specifies a valid directory path or file name for the FTP server file system. The string can contain wildcards, but blank spaces are not accepted. If the value of lpszSearchFile is NULL or if it is an empty string, it will find the first file in the current directory on the server.
  • lpFindFileData
    [out] Long pointer to a WIN32_FIND_DATA structure that receives data about the found file or directory.
  • dwFlags
    [in] Specifies an application-defined value that associates this search with an application. The following table shows the possible values. This parameter is one of these values.
    Value Description
    INTERNET_FLAG_DONT_CACHE Does not add the returned entity to the cache. Identical to the preferred value, INTERNET_FLAG_NO_CACHE_WRITE.
    INTERNET_FLAG_HYPERLINK Forces a reload if there was no Expires time and no Last-Modified time returned by the server when determining whether to reload the item from the network.
    INTERNET_FLAG_MUST_CACHE_REQUEST Causes a temporary file to be created if the file cannot be cached. Identical to the preferred value, INTERNET_FLAG_NEED_FILE.
    INTERNET_FLAG_NEED_FILE Causes a temporary file to be created if the file cannot be cached.
    INTERNET_FLAG_NO_CACHE_WRITE Does not add the returned entity to the cache. If the INTERNET_FLAG_HYPERLINK is also specified, WinInet will create the cache file but will not commit it.
    INTERNET_FLAG_RELOAD Forces a download of the requested file, object, or directory listing from the origin server, not from the cache.
    INTERNET_FLAG_RESYNCHRONIZE Causes the FTP resource to be reloaded from the server.
  • dwContext
    [in] Specifies an application-defined value that associates this search with application data. This parameter is used only if the application has already called the InternetSetStatusCallback function to set up a status callback function. All status requests are handled synchronously.

Return Values

If the directory enumeration was started, a valid handle for the request indicates success. NULL indicates failure. To get extended error data, call GetLastError. If the function finds no matching files, GetLastError returns ERROR_NO_MORE_FILES.

Remarks

This function enumerates both files and directories.

FtpFindFirstFile is similar to the Win32 FindFirstFile function. However, only one FtpFindFirstFile can occur at a time within a given FTP session. Therefore, because the FTP protocol accepts only one directory enumeration per session, the enumerations are correlated with the FTP session handle. After calling this function and until calling the InternetCloseHandle function, the application cannot call FtpFindFirstFile again on the given FTP session handle. If a call is made, , the function will fail with ERROR_FTP_TRANSFER_IN_PROGRESS.

After beginning a directory enumeration with FtpFindFirstFile, the InternetFindNextFile function can be used to continue the enumeration.

InternetCloseHandle closes the handle returned by FtpFindFirstFile. If it closes the handle before InternetFindNextFile fails with ERROR_NO_MORE_FILES, the directory enumeration will be terminated.

Because the FTP protocol provides no standard means of enumerating, common file data, such as file creation date and time, is not always available or correct. When this happens, FtpFindFirstFile and InternetFindNextFile fill unavailable data with an estimate. For example, creation and last access dates will often be the same as the file modification date.

The application cannot call FtpFindFirstFile between calls to FtpOpenFile and InternetCloseHandle.

Requirements

OS Versions: Windows CE 2.0 and later.
Header: Wininet.h.
Link Library: Wininet.lib.

See Also

FindFirstFile | FtpFindFirstFile | FtpOpenFile | InternetCloseHandle | InternetConnect | InternetFindNextFile | InternetSetStatusCallback | WIN32_FIND_DATA | WinInet Functions

Last updated on Wednesday, April 13, 2005

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