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LZOpenFile info  Overview  Group

The LZOpenFile function creates, opens, reopens, or deletes the specified file.

INT LZOpenFile(

    LPTSTR lpFileName,

// address of name of file to be opened

    LPOFSTRUCT lpReOpenBuf,

// address of open file structure

    WORD wStyle 

// action to take

   );

Parameters

lpFileName
Points to a string that specifies the name of a file.
lpReOpenBuf
Points to the OFSTRUCT structure that is to receive information about the file when the file is first opened. The structure can be used in subsequent calls to the LZOpenFile function to refer to the open file.

The szPathName member of this structure contains characters from the original equipment manufacturer (OEM) character set.

wStyle
Specifies the action to take. This parameter can be a combination of the following values:

Value

Meaning

OF_CANCEL

Ignored. In the Win32-based application programming interface (API), the OF_PROMPT style produces a dialog box containing a Cancel button.

OF_CREATE

Directs LZOpenFile to create a new file. If the file already exists, it is truncated to zero length.

OF_DELETE

Deletes the file.

OF_EXIST

Opens the file and then closes it to test for a file’s existence.

OF_PARSE

Fills the OFSTRUCT structure but carries out no other action.

OF_PROMPT

Displays a dialog box if the requested file does not exist. The dialog box informs the user that Windows cannot find the file, and it contains Retry and Cancel buttons. Choosing the Cancel button directs LZOpenFile to return a “file not found” error message.

OF_READ

Opens the file for reading only.

OF_READWRITE

Opens the file for reading and writing.

OF_REOPEN

Opens the file using information in the reopen buffer.

OF_SHARE_DENY_NONE

Opens the file without denying other processes read or write access to the file. LZOpenFile fails if the file has been opened in compatibility mode by any other process.

OF_SHARE_DENY_READ

Opens the file and denies other processes read access to the file. LZOpenFile fails if the file has been opened in compatibility mode or has been opened for read access by any other process.

OF_SHARE_DENY_WRITE

Opens the file and denies other processes write access to the file. LZOpenFile fails if the file has been opened in compatibility mode or has been opened for write access by any other process.

OF_SHARE_EXCLUSIVE

Opens the file in exclusive mode, denying other processes both read and write access to the file. LZOpenFile fails if the file has been opened in any other mode for read or write access, even by the current process.

OF_WRITE

Opens the file for writing only.

Return Values

If the function succeeds and the value specified by the wStyle parameter is not OF_READ, the return value is a handle identifying the file. If the file is compressed and opened with wStyle set to OF_READ, the return value is a special file handle.

If the function fails, the return value is an LZERROR_* code. These codes have values less than zero. There is no extended error information for this function; do not call GetLastError.

Note  LZOpenFile calls neither SetLastError nor SetLastErrorEx; thus, its failure does not affect a thread’s last-error code.

Here is a list of the LZERROR_* codes that LZOpenFile can return upon failure:

Value

Meaning

LZERROR_BADINHANDLE

The handle identifying the source file is not valid. The file cannot be read.

LZERROR_GLOBALLOC

The maximum number of open compressed files has been exceeded or local memory cannot be allocated.

Remarks

If the wStyle parameter is the OF_READ flag (or OF_READ and any of the OF_SHARE_ flags) and the file is compressed, LZOpenFile calls the LZInit function, which performs the required initialization for the decompression operations.

The handle this function returns is compatible only with the functions in LZEXPAND.DLL; it should not be used for other file operations.

See Also

LZClose, LZInit, LZRead

See also:


file: /Techref/os/win/api/win32/func/src/f56_7.htm, 9KB, , updated: 2001/6/24 02:06, local time: 2022/5/20 10:01,
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