fields.cpp

一个通讯管理机的源代码。比较好用。推荐

   if( SchemaPtr[FieldNo].Type == 'C' && SchemaPtr[FieldNo].NoOfDecs > 0 )
     length = SchemaPtr[FieldNo].LongFieldLen;
   else
     length = SchemaPtr[FieldNo].FieldLen;

   if( RecBufSw )
     sf.assign( xbString(SchemaPtr[FieldNo].Address2, length), 0, length );
//     sf.assign( SchemaPtr[FieldNo].Address2, length );
   else
     sf.assign( xbString(SchemaPtr[FieldNo].Address, length), 0, length );
//     sf.assign( SchemaPtr[FieldNo].Address, length );
   return( length ); 
}
/************************************************************************/
/* This function fills a field in the record buffer with data from
   a buffer for a particular field.

   Use GetFieldNo to get a number based on a field's name 

   Field type N or F is loaded as right justified, left blank filled.
   Other fields are loaded as left justified, right blank filled.

   This method does check the data's validity.

   If successful, this function returns 0, if invalid data, it returns -1
   or XB_INVALID_FIELDNO
*/

//! Put a value into the specified field.
/*!
*/
xbShort xbDbf::PutField(const char *Name, const char *buf) {
   return PutField(GetFieldNo(Name), buf);
}

//! Put a raw value into the specified field.
/*!
*/
xbShort xbDbf::PutRawField(const char *Name, const char *buf) {
   return PutRawField(GetFieldNo(Name), buf);
}

//! Put a value into the specified field.
/*!
*/
xbShort xbDbf::PutField(const xbShort FieldNo, const char *buf) {
   xbShort len, i;
   char * startpos;
   char * tp;           /*  target pointer */
   const char * sp;        /*  source pointer */

   if( FieldNo < 0 || FieldNo >= NoOfFields )
      xb_error(XB_INVALID_FIELDNO);

   if( DbfStatus != XB_UPDATED )
   {
      DbfStatus = XB_UPDATED;
      memcpy( RecBuf2, RecBuf, RecordLen );
   }
  
   if( SchemaPtr[FieldNo].Type == 'L' && !ValidLogicalData( buf ))
     xb_error(XB_INVALID_DATA)

   else if(( SchemaPtr[FieldNo].Type == 'F' || SchemaPtr[FieldNo].Type == 'N' )
        && !ValidNumericData( buf )) 
     xb_error(XB_INVALID_DATA)

   else if( SchemaPtr[FieldNo].Type == 'D' ){
    xbDate d;
    if( !d.DateIsValid( buf ))
      xb_error(XB_INVALID_DATA);
   }

   if( SchemaPtr[FieldNo].Type == 'C' && SchemaPtr[FieldNo].NoOfDecs > 0 )
     memset( SchemaPtr[FieldNo].Address, 0x20, SchemaPtr[FieldNo].LongFieldLen );
   else
     memset( SchemaPtr[FieldNo].Address, 0x20, SchemaPtr[FieldNo].FieldLen );

   len = strlen( buf );

   if(( SchemaPtr[FieldNo].Type == 'N' || SchemaPtr[FieldNo].Type == 'F')
         && len > SchemaPtr[FieldNo].FieldLen )
     xb_error(XB_INVALID_DATA)
   else if( len > SchemaPtr[FieldNo].FieldLen )
     len = SchemaPtr[FieldNo].FieldLen;

   if( SchemaPtr[FieldNo].Type == 'F' || SchemaPtr[FieldNo].Type == 'N' 
       || SchemaPtr[FieldNo].Type == 'M' 
     ) {
      const char *sdp = strchr( buf, '.' ); /*  source decimal point */
      len = 0;
      sp =buf;
      while( *sp && *sp != '.' ) { len++; sp++; }
      
      if( SchemaPtr[FieldNo].NoOfDecs > 0 )
      {
         /* do the right of decimal area */
         tp = SchemaPtr[FieldNo].Address;
         tp += SchemaPtr[FieldNo].FieldLen - SchemaPtr[FieldNo].NoOfDecs - 1;
         *tp++ = '.';
         sp = sdp;
         if( sp ) sp++;
         for( i = 0; i < SchemaPtr[FieldNo].NoOfDecs; i++ )
            if( sp && *sp ) *tp++ = *sp++; else *tp++ = '0'; 

         startpos= SchemaPtr[FieldNo].Address +
                   SchemaPtr[FieldNo].FieldLen -
                   SchemaPtr[FieldNo].NoOfDecs - len - 1; 
      }
      else
      {
         startpos=SchemaPtr[FieldNo].Address+SchemaPtr[FieldNo].FieldLen-len; 
      }
   }
   else
      startpos = SchemaPtr[FieldNo].Address;

   memcpy( startpos, buf, len );
   return 0;
}

//! Put a raw value into the specified field.
/*!
*/
xbShort xbDbf::PutRawField(const xbShort FieldNo, const char *buf) {
   xbShort len;
   char * startpos;

   if( FieldNo < 0 || FieldNo >= NoOfFields )
      xb_error(XB_INVALID_FIELDNO);

   if( DbfStatus != XB_UPDATED )
   {
      DbfStatus = XB_UPDATED;
      memcpy( RecBuf2, RecBuf, RecordLen );
   }
  
   startpos = SchemaPtr[FieldNo].Address;
   len = SchemaPtr[FieldNo].FieldLen;
   memcpy( startpos, buf, len );
   
   return 0;
}

/************************************************************************/
//! Get the value of the specified field.
/*!
*/
xbShort xbDbf::GetField(const xbShort FieldNo, char *buf) const {
   return GetField(FieldNo, buf, 0);
}

/************************************************************************/
//! Get the raw value of the specified field.
/*!
*/
xbShort xbDbf::GetRawField(const xbShort FieldNo, char *buf) const {
   return GetField(FieldNo, buf, 0);
}

/************************************************************************/
//! Get the long value of the specified field.
/*!
*/
xbLong xbDbf::GetLongField( const xbShort FieldNo ) const
{
   char buf[18];
   memset( buf, 0x00, 18 );
   GetField( FieldNo, buf );
   return atol( buf );
}
/************************************************************************/
//! Get the long value of the specified field.
/*!
*/
xbLong xbDbf::GetLongField( const char * FieldName ) const
{
  return( GetLongField( GetFieldNo( FieldName )));
}
/************************************************************************/
//! Put a long value into the specified field.
/*!
*/
xbShort xbDbf::PutLongField( const xbShort FieldNo, const xbLong Val )
{
   char buf[18];
   memset( buf, 0x00, 18 );
   sprintf( buf, "%ld", Val );
   return( PutField( FieldNo, buf ));
}
/************************************************************************/
//! Put a long value into the specified field.
/*!
*/
xbShort xbDbf::PutLongField(const char *FieldName, const xbLong Val) {
  return (PutLongField(GetFieldNo(FieldName), Val));
}
/************************************************************************/
//! Get the float value of the specified field.
/*!
*/
xbFloat xbDbf::GetFloatField(const xbShort FieldNo) {
   char buf[21];
   memset( buf, 0x00, 21 );
   if( GetField( FieldNo, buf ) != 0 )
      return atof( buf );
   else
      return 0;
}
/************************************************************************/
//! Get the float value of the specified field.
/*!
*/
xbFloat xbDbf::GetFloatField(const char * FieldName) {
xbShort fnum;
  if ((fnum = GetFieldNo(FieldName)) != -1)
    return GetFloatField(fnum);
  else
    return 0;
}
/************************************************************************/
//! Put a float value into the specified field.
/*!
*/
xbShort xbDbf::PutFloatField( const xbShort FldNo, const xbFloat f )
{
   char buf[25];
   char buf2[12];
   memset( buf, 0x00, 25 );
   memset( buf2, 0x00, 12 );
   sprintf( buf, "%d.%df", GetFieldLen( FldNo ), GetFieldDecimal( FldNo ));
   strcpy( buf2, "%-" );
   strcat( buf2, buf );
   sprintf( buf, buf2, f );

   /* remove trailing space */
   xbShort i = 0;
   while( i < 25 ) 
     if( buf[i] == 0x20 ){
       buf[i] = 0x00;
       break;
     } else
       i++;
   return PutField( FldNo, buf );
}
/************************************************************************/
//! Put a float value into the specified field.
/*!
*/
xbShort xbDbf::PutFloatField(const char *FieldName, const xbFloat f) {
  xbShort fnum;
  if ((fnum = GetFieldNo(FieldName)) != -1)
    return PutFloatField(fnum, f);
  else
    return 0;
}
/************************************************************************/
//! Get the double value of the specified field.
/*!
*/
xbDouble xbDbf::GetDoubleField( const xbShort FieldNo, xbShort RecBufSw )
{
   char buf[21];
   memset( buf, 0x00, 21 );
   if( GetField( FieldNo, buf, RecBufSw ) != 0 )
      return strtod( buf, NULL );
   else
      return 0;
}
/************************************************************************/
//! Get the double value of the specified field.
/*!
*/
xbDouble xbDbf::GetDoubleField(const char *FieldName) {
  xbShort fnum;
  if ((fnum = GetFieldNo(FieldName)) != -1)
    return GetDoubleField(fnum);
  else
    return 0;
}
/************************************************************************/
//! Put a double value into the specified field.
/*!
*/
xbShort xbDbf::PutDoubleField( const xbShort FieldNo, const xbDouble d) {
  return PutFloatField(FieldNo, (xbFloat)d);
}
/************************************************************************/
//! Put a double value into the specified field.
/*!
*/
xbShort xbDbf::PutDoubleField(const char *FieldName, const xbDouble d) {
  xbShort fnum;
  if ((fnum = GetFieldNo(FieldName)) != -1)
    return PutFloatField(fnum, (xbFloat)d);
  else
    return 0;
}
/************************************************************************/
//! Get the logical value of the specified field.
/*!
*/
xbShort xbDbf::GetLogicalField( const xbShort FieldNo )
{
   char buf[3];
   if( GetFieldType( FieldNo ) != 'L' ) return -1;
   memset( buf, 0x00, 3 );
   GetField( FieldNo, buf );
   if( buf[0] == 'Y' || buf[0] == 'y' || buf[0] == 'T' || buf[0] == 't' )
      return 1;
   else
      return 0;
}
/************************************************************************/
//! Get the logical value of the specified field.
/*!
*/
xbShort xbDbf::GetLogicalField( const char * FieldName )
{
   xbShort fnum;
   if(( fnum = GetFieldNo( FieldName )) != -1 )
      return GetLogicalField( fnum );
   else
      return -1;
}
/************************************************************************/
//! Get the string value of the specified field.
/*!
*/
char * xbDbf::GetStringField( const char * FieldName )
{
  return GetStringField(GetFieldNo(FieldName));
}
/************************************************************************/
//! Get the string value of the specified field.
/*!
*/
char * xbDbf::GetStringField( const xbShort FieldNo )
{
  /* allocate memory if needed */
  if( !SchemaPtr[FieldNo].fp )
    SchemaPtr[FieldNo].fp = new char[GetFieldLen(FieldNo)+1];

  if( !SchemaPtr[FieldNo].fp )
#ifdef HAVE_EXCEPTIONS
    throw xbOutOfMemoryException();
#else
    return 0;
#endif

  GetField( FieldNo, SchemaPtr[FieldNo].fp );
  char* p = SchemaPtr[FieldNo].fp;
  while ((*p != ' ') && (*p != 0))
  {
  	if (*p++ == ']')
  	{
  		*p++ = ':';
  		break;
  	}
  }
  *p++ = 0;
	*p = 0;

  return SchemaPtr[FieldNo].fp;
}
/************************************************************************/