file文件操作，可以在末尾追加，那么能不能在末尾进行删除操作？解决方案
file文件操作，可以在末尾追加，那么能不能在末尾进行删除操作？
我知道可以读取文件(FileSize-要删除的长度），然后再保存。
但这样效率太低了。
------解决方案--------------------
SetEndOfFile
The SetEndOfFile function moves the end-of-file (EOF) position for the specified file to the current position of the file pointer.
BOOL SetEndOfFile(
HANDLE hFile // handle of file whose EOF is to be set
);
Parameters
hFile
Handle to the file to have its EOF position moved. The file handle must have been created with GENERIC_WRITE access to the file.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
This function can be used to truncate or extend a file. If the file is extended, the contents of the file between the old EOF position and the new position are not defined.
If you called CreateFileMapping to create a file-mapping object for hFile, you must first call UnmapViewOfFile to unmap all views and call CloseHandle to close the file-mapping object before you can call SetEndOfFile.
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winbase.h.
Import Library: Use kernel32.lib.
See Also
File I/O Overview, File Functions, CloseHandle, CreateFile, CreateFileMapping, UnmapViewOfFile
我知道可以读取文件(FileSize-要删除的长度），然后再保存。
但这样效率太低了。
------解决方案--------------------
SetEndOfFile
The SetEndOfFile function moves the end-of-file (EOF) position for the specified file to the current position of the file pointer.
BOOL SetEndOfFile(
HANDLE hFile // handle of file whose EOF is to be set
);
Parameters
hFile
Handle to the file to have its EOF position moved. The file handle must have been created with GENERIC_WRITE access to the file.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
This function can be used to truncate or extend a file. If the file is extended, the contents of the file between the old EOF position and the new position are not defined.
If you called CreateFileMapping to create a file-mapping object for hFile, you must first call UnmapViewOfFile to unmap all views and call CloseHandle to close the file-mapping object before you can call SetEndOfFile.
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winbase.h.
Import Library: Use kernel32.lib.
See Also
File I/O Overview, File Functions, CloseHandle, CreateFile, CreateFileMapping, UnmapViewOfFile