如何获得文件的头指针和尾指针？

[heaven_tsm]

如何获得文件的头指针和尾指针？

[Coder 青田]

CFile::SeekToBegin
void SeekToBegin( );
throw( CFileException );

Remarks

Sets the value of the file pointer to the beginning of the file. SeekToBegin() is equivalent to Seek( 0L, CFile::begin ).

Example

//example for CFile::SeekToBegin
extern CFile cfile;
cfile.SeekToBegin();

CFile Overview | Class Members | Hierarchy Chart






/////////////////////

CFile::SeekToEnd
DWORD SeekToEnd( );
throw( CFileException );

Return Value

The length of the file in bytes.

Remarks

Sets the value of the file pointer to the logical end of the file. SeekToEnd() is equivalent to CFile::Seek( 0L, CFile::end ).

Example

//example for CFile::SeekToEnd
extern CFile cfile;
DWORD dwActual = cfile.SeekToEnd();

CFile Overview | Class Members | Hierarchy Chart

See Also CFile::GetLength, CFile::Seek, CFile::SeekToBegin

[windyloft]

SeekToBegin
SeekToEnd

[oyljerry]

CFile file("C:\HELLO.TXT",CFile::modeRead);///只读方式打开
///CFile::modeRead可改为 CFile::modeWrite(只写),CFile::modeReadWrite(读写),CFile::modeCreate(新建)
例子：
{
CFile file;
file.Open("C:\HELLO.TXT",CFile::modeCreate|Cfile::modeWrite);
...
...
}

移动文件指针
file.Seek(100,CFile::begin);///从文件头开始往下移动100字节
file.Seek(-50,CFile::end);///从文件末尾往上移动50字节
file.Seek(-30,CFile::current);///从当前位置往上移动30字节
file.SeekToBegin();///移到文件头
file.SeekToEnd();///移到文件尾

读写文件
读文件：
char buffer[1000];
file.Read(buffer,1000);
写文件：
CString string("这个世界只有偏执狂才能成功");
file.Write(string,8);

关闭文件
file.Close();