VC斷定一個文件為目次的辦法。本站提示廣大學習愛好者：（VC斷定一個文件為目次的辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是VC斷定一個文件為目次的辦法正文
本文實例講述了VC斷定一個文件為目次的辦法，分享給年夜家供年夜家參考。詳細完成辦法以下：
這是一個自界說函數，用於斷定一個文件能否為目次：
/**
* check whether a file is a directory
@return true if is a directory, else false(if file not exists, false)
*/
__declspec(dllexport) bool IsDirectory(const char* filename)
{
DWORD dwAttr = ::GetFileAttributes(filename); //獲得文件屬性
if (dwAttr == 0xFFFFFFFF) // 文件或目次不存在
return false;
else if (dwAttr&FILE_ATTRIBUTE_DIRECTORY) // 假如是目次
return true;
else
return false;
}
以下是GetFileAttribute界說，摘自msdn：
Retrieves a set of FAT file system attributes for a specified file or directory.獲得FAT文件體系的文件屬性
Parameters
lpFileName
The name of the file or directory.In the ANSI version of this function, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "//?/" to the path. For more information, see Naming a File.文件名或目次名。最年夜長度為體系的文件名最年夜長度。假如是unicode情況，須要挪用這個函數的unicode版本。
Return Value
If the function succeeds, the return value contains the attributes of the specified file or directory.
假如函數勝利了，前往值會包括以下文件屬性：
If the function fails, the return value is INVALID_FILE_ATTRIBUTES. To get extended error information, call GetLastError.
假如函數掉敗，前往值是INVALID_FILE_ATTRIBUTES. 可以經由過程GetLastError獲得更具體的失足信息
The attributes can be one or more of the following values.
文件屬性可所以以下值的一個或多個的組合。
FILE_ATTRIBUTE_ARCHIVE
32
0x20
A file or directory that is an archive file or directory.
Applications use this attribute to mark files for backup or removal.
存檔文件
FILE_ATTRIBUTE_COMPRESSED
2048
0x800
A file or directory that is compressed.
For a file, all of the data in the file is compressed.
For a directory, compression is the default for newly created files and subdirectories.
緊縮文件
FILE_ATTRIBUTE_DEVICE
64
0x40
Reserved; do not use.
FILE_ATTRIBUTE_DIRECTORY
16
0x10
The handle that identifies a directory.
目次文件
FILE_ATTRIBUTE_ENCRYPTED
16384
0x4000
A file or directory that is encrypted.
For a file, all data streams in the file are encrypted.
For a directory, encryption is the default for newly created files and subdirectories.
加密文件
FILE_ATTRIBUTE_HIDDEN
2
0x2
The file or directory is hidden. It is not included in an ordinary directory listing.
隱蔽文件
FILE_ATTRIBUTE_NORMAL
128
0x80
A file or directory that does not have other attributes set.
This attribute is valid only when used alone.
FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
8192
0x2000
The file is not to be indexed by the content indexing service.
FILE_ATTRIBUTE_OFFLINE
4096
0x1000
The data of a file is not available immediately.
This attribute indicates that the file data is physically moved to offline storage. This attribute is used by Remote Storage, which is the hierarchical storage management software. Applications should not arbitrarily change this attribute.
FILE_ATTRIBUTE_READONLY
1
0x1
A file or directory that is read-only.
For a file, applications can read the file, but cannot write to it or delete it.
For a directory, applications cannot delete it.
FILE_ATTRIBUTE_REPARSE_POINT
1024
0x400
A file or directory that has an associated reparse point, or a file that is a symbolic link.
FILE_ATTRIBUTE_SPARSE_FILE
512
0x200
A file that is a sparse file.
FILE_ATTRIBUTE_SYSTEM
4
0x4
A file or directory that the operating system uses a part of, or uses exclusively.
FILE_ATTRIBUTE_TEMPORARY
256
0x100
A file that is being used for temporary storage.
File systems avoid writing data back to mass storage if sufficient cache memory is available, because typically, an application deletes a temporary file after the handle is closed. In that scenario, the system can entirely avoid writing the data. Otherwise, the data is written after the handle is closed.
FILE_ATTRIBUTE_VIRTUAL
65536
0x10000
A file is a virtual file.
願望本文所述對年夜家的VC法式設計有所贊助。
