新建一个MFC对话框应用,在OnInitialDialog()中添加下面的代码
CFile cfile;
cfile.Open(_T("file.data"), CFile::modeCreate | CFile::modeReadWrite);
char buf[100];
memset(buf, 'a', sizeof(buf));
cfile.Write(buf, 100);
cfile.Flush();
cfile.SeekToBegin();
char buf_read[100];
cfile.Read(buf_read, 100);
ASSERT(0 == memcmp(buf, buf_read, sizeof(buf)));