Partager via


CFile::Read

Reads data into a buffer from the file associated with the CFile object.

virtual UINT Read(
   void* lpBuf,
   UINT nCount 
);

Parameters

  • lpBuf
    Pointer to the user-supplied buffer that is to receive the data read from the file.

  • nCount
    The maximum number of bytes to be read from the file. For text-mode files, carriage return–linefeed pairs are counted as single characters.

Return Value

The number of bytes transferred to the buffer. Note that for all CFile classes, the return value may be less than nCount if the end of file was reached.

Example

CFile cfile;
cfile.Open(_T("Write_File.dat"), CFile::modeCreate | 
   CFile::modeReadWrite);
char pbufWrite[100];
memset(pbufWrite, 'a', sizeof(pbufWrite));
cfile.Write(pbufWrite, 100);         
cfile.Flush();
cfile.SeekToBegin();
char pbufRead[100];
cfile.Read(pbufRead, sizeof(pbufRead));
ASSERT(0 == memcmp(pbufWrite, pbufRead, sizeof(pbufWrite)));

For another example see CFile::Open.

Requirements

Header: afx.h

See Also

Concepts

CFile Class

CFile Members

Hierarchy Chart