expanded file read error message, now checks to see if either eof or rerror are…

expanded file read error message, now checks to see if either eof or rerror are set and outputs an error message stating what was set.

DaqFileIO.cxx

@@ -2,7 +2,7 @@
 ///
 // DAQ low level IO Library
 // 
-// $Id: DaqFileIO.cxx,v 1.14 2007/04/25 17:54:35 dheitbri Exp $
+// $Id: DaqFileIO.cxx,v 1.15 2010/05/03 17:25:45 iowa\dheitbri Exp $
 // Date: March, 2005
 // Author: Yiannis Papelis
 //
@@ -2019,7 +2019,14 @@ CDaqLowLevelIo::ReadFrameHeader(
 
 		// Read the frame header; if this fails, we are really in trouble
 		if ( fread(recHead, sizeof(int), 3, m_pFile) != 3 ) {
-			sprintf(buf, "Couldn't read file, premature end or messed up file");
+			if (feof(m_pFile) != 0){
+				sprintf(buf, "Couldn't read file, premature end of file");
+				
+			}else if (ferror(m_pFile) != 0){
+				sprintf(buf, "Couldn't read file, system read error");
+			}else{
+				sprintf(buf, "Couldn't read file, uknown issue, EOF not set, read error flag not set");
+			}
 			m_LastError = buf;
 			return eDAQ_READ_ERROR;
 		}