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CStdioFile file;
file.Open("a.txt",CFile::modeReadWrite);
CString str;
while(true){
file.ReadString(str);
if(str.Left(str.Find(",",0))==CString("192.168.1.1:21")){
file.Seek(0,CFile::current);
file.Write("192.168.1.1:21,40.000,40.000",strlen("192.168.1.1:21,40.000,40.000"));
break;
}
}
file.Close();