二进制文件读写实例

转：http://bbs.pfan.cn/post-163315.html

void CTempDlg::OnOK() 
{
CFile cfile;
CString pFileName ="c://test1.dat";
char pbuf[4]="err";
if(!cfile.Open(pFileName, CFile::modeCreate|CFile::modeReadWrite|CFile::typeBinary))
MessageBox("failed");
else
{
    cfile.Write( pbuf, 4 );
    cfile.Close();
}
cfile.Open(pFileName, CFile::modeReadWrite | CFile::typeBinary);
cfile.Read( pbuf, 4 );
CString str;
str.Format("%s",pbuf); 
MessageBox(str);

CDialog::OnOK();
}