VC判斷一個(gè)文件為目錄的方法
本文實(shí)例講述了VC判斷一個(gè)文件為目錄的方法，分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：
這是一個(gè)自定義函數(shù)，用于判斷一個(gè)文件是否為目錄：
* 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); //得到文件屬性
if (dwAttr == 0xFFFFFFFF) // 文件或目錄不存在
return false;
else if (dwAttr&FILE_ATTRIBUTE_DIRECTORY) // 如果是目錄
return true;
else
return false;
}
以下是GetFileAttribute定義，摘自msdn：
Retrieves a set of FAT file system attributes for a specified file or directory.得到FAT文件系統(tǒng)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 "http://?/" to the path. For more information, see Naming a File.文件名或目錄名。最大長(zhǎng)度為系統(tǒng)的文件名最大長(zhǎng)度。如果是unicode環(huán)境，需要調(diào)用這個(gè)函數(shù)的unicode版本。
Return Value
If the function succeeds, the return value contains the attributes of the specified file or directory.
如果函數(shù)成功了，返回值會(huì)包含以下文件屬性：
If the function fails, the return value is INVALID_FILE_ATTRIBUTES. To get extended error information, call GetLastError.
如果函數(shù)失敗，返回值是INVALID_FILE_ATTRIBUTES. 可以通過(guò)GetLastError獲取更詳細(xì)的出錯(cuò)信息
The attributes can be one or more of the following values.
文件屬性可以是下列值的一個(gè)或多個(gè)的組合。
| Return code/value | Description |
|---|---|
|
FILE_ATTRIBUTE_ARCHIVE |
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 |
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. 壓縮文件 |
|
FILE_ATTRIBUTE_DEVICE |
Reserved; do not use. |
|
FILE_ATTRIBUTE_DIRECTORY |
The handle that identifies a directory. 目錄文件 |
|
FILE_ATTRIBUTE_ENCRYPTED |
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 |
The file or directory is hidden. It is not included in an ordinary directory listing. 隱藏文件 |
|
FILE_ATTRIBUTE_NORMAL |
A file or directory that does not have other attributes set. This attribute is valid only when used alone.
|
|
FILE_ATTRIBUTE_NOT_CONTENT_INDEXED |
The file is not to be indexed by the content indexing service. |
|
FILE_ATTRIBUTE_OFFLINE |
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 |
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 |
A file or directory that has an associated reparse point, or a file that is a symbolic link. |
|
FILE_ATTRIBUTE_SPARSE_FILE |
A file that is a sparse file. |
|
FILE_ATTRIBUTE_SYSTEM |
A file or directory that the operating system uses a part of, or uses exclusively. |
|
FILE_ATTRIBUTE_TEMPORARY |
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 |
A file is a virtual file. |
希望本文所述對(duì)大家的VC程序設(shè)計(jì)有所幫助。
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