出现一个错误：
error C2065: 'seek' : undeclared identifier
怎么回事？

以下为MSDN里的帮助:
CFile::Seek

virtual LONG Seek( LONG lOff, UINT nFrom );
throw( CFileException );

Return Value

If the requested position is legal, Seek returns the new byte offset from the beginning of the file. Otherwise, the return value is undefined and a CFileException object is thrown.

Parameters

lOff

Number of bytes to move the pointer.

nFrom

Pointer movement mode. Must be one of the following values:

• CFile::begin Move the file pointer lOff bytes forward from the beginning of the file.
  
  
• CFile::current Move the file pointer lOff bytes from the current position in the file.
  
  
• CFile::end Move the file pointer lOff bytes from the end of the file. Note that lOff must be negative to seek into the existing file; positive values will seek past the end of the file.

Remarks

Repositions the pointer in a previously opened file. The Seek function permits random access to a file’s contents by moving the pointer a specified amount, absolutely or relatively. No data is actually read during the seek.

When a file is opened, the file pointer is positioned at offset 0, the beginning of the file.

Example

//example for CFile::Seek
extern CFile cfile;
LONG lOffset = 1000, lActual;
lActual = cfile.Seek( lOffset, CFile::begin );

我记得还可以

SeekToBegin();

以及

SeekToEnd();