LZSeek function (lzexpand.h)
Moves a file pointer the specified number of bytes from a starting position.
Syntax
LONG LZSeek(
[in] INT hFile,
[in] LONG lOffset,
[in] INT iOrigin
);
Parameters
[in] hFile
A handle to the file.
[in] lOffset
The number of bytes by which to move the file pointer.
[in] iOrigin
The starting position of the pointer. This parameter must be one of the following values.
| Value | Meaning |
|---|---|
|
Moves the file pointer lOffset bytes from the beginning of the file. |
|
Moves the file pointer lOffset bytes from the current position. |
|
Moves the file pointer lOffset bytes from the end of the file. |
Return value
If the function succeeds, the return value specifies the offset from the beginning of the file to the new pointer position.
If the function fails, the return value is an LZERROR_* code. These codes have values less than zero. Note that LZSeek calls neither SetLastError nor SetLastErrorEx; thus, its failure does not affect a thread's last-error code.
The following is the list of error codes that LZSeek can return upon failure.
| Return code | Description |
|---|---|
|
The handle identifying the source file is not valid. The file cannot be read. |
|
One of the parameters is outside the range of acceptable values. |
|
The LZ file handle cannot be locked down. |
There is no extended error information for this function; do not call GetLastError.
Remarks
The handle identified by the hFile parameter must be retrieved by calling either the LZInit or LZOpenFile function.
In Windows 8 and Windows Server 2012, this function is supported by the following technologies.
| Technology | Supported |
|---|---|
| Server Message Block (SMB) 3.0 protocol | Yes |
| SMB 3.0 Transparent Failover (TFO) | Yes |
| SMB 3.0 with Scale-out File Shares (SO) | Yes |
| Cluster Shared Volume File System (CsvFS) | Yes |
| Resilient File System (ReFS) | Yes |
CsvFs will do redirected IO for compressed files.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | lzexpand.h (include Windows.h) |
| Library | Lz32.lib |
| DLL | Lz32.dll |