Progress.IO.MemoryOutputStream class

This class is responsible for streaming data to memory. A MemoryOutputStream object enables write operations to memory and is expandable. It encapsulates the MEMPTR data type and simplifies MEMPTR operations.

Progress.IO.MemoryOutputStream extends Progress.IO.OutputStream:

As with other output stream classes, the MemoryOutputStream class maintains its own internal write position and eliminates the need to keep track of MEMPTR write positions.

Serializable

No

Constructors


`PUBLIC MemoryOutputStream ( ) PUBLIC MemoryOutputStream (INPUT size AS INT64)`

size: The Data and Length properties are initialized to the value specified by size.
When size is not specified, the Data and Length properties are initialized to 0.

Super Class

Progress.IO.OutputStream class

Interfaces

This class does not implement an interface.

Public Properties


ByteOrder property	BytesWritten property
Data property	Length property (MemoryOutputStream)

Public Methods


Clear( ) method (MemoryOutputStream)	SetByteOrder( ) method
Write( ) method (MemoryOutputStream)	WriteByte( ) method
WriteDouble( ) method	WriteInt64( ) method
WriteFloat( ) method	WriteLong( ) method
WriteShort( ) method	WriteUnsignedLong( ) method
WriteUnsignedShort( ) method	–

Public Events

This class does not define events.

Note

The following table illustrates values that result from constructors and Write( )/Clear( ) methods:


Method/Constructor	Values
Method/Constructor	Obj:Length	Obj:BytesWritten
`Obj = NEW MemoryOutputStream()`	0	0
`Obj:Write(“12345”)`	5	5
`Obj:Clear()`	0	0
`Obj = NEW MemoryOutputStream(100)`	100	0
`Obj:Write(“12345678”)`	100	8
`Obj:Clear()`	100	0

Examples

Table 1. READ & WRITE decimal and integer methods
DEFINE VARIABLE myDate AS DATE INITIAL "1/1/2020". DEFINE VARIABLE myInt64 AS INT64 INITIAL 42. DEFINE VARIABLE myDouble AS DECIMAL INITIAL 42.42. DEFINE VARIABLE myFloat AS DECIMAL INITIAL 42.42. DEFINE VARIABLE myLong AS INTEGER INITIAL -53. DEFINE VARIABLE myShort AS INTEGER INITIAL -53. DEFINE VARIABLE myULong AS INTEGER INITIAL 123456789. DEFINE VARIABLE myUShort AS INTEGER INITIAL 12345. DEFINE VARIABLE inMs AS Progress.IO.MemoryInputStream. DEFINE VARIABLE outMs AS Progress.IO.MemoryOutputStream. outMs = NEW Progress.IO.MemoryOutputStream(). outMs:WriteLong(INTEGER(myDate)). outMs:WriteInt64(myInt64). outMs:WriteDouble(myDouble). outMs:WriteFloat(myFloat). outMs:WriteLong(myLong). outMs:WriteShort(myShort). outMs:WriteUnsignedLong(myULong). outMs:WriteUnsignedShort(myUShort). inMs = NEW Progress.IO.MemoryInputStream(INPUT outMs:Data). MESSAGE "ReadLong:" inMs:ReadLong() SKIP "ReadInt64:" inMs:ReadINT64() SKIP "ReadDouble:" inMs:ReadDouble() SKIP "ReadFloat:" inMs:ReadFloat() SKIP "ReadLong:" inMs:ReadLong() SKIP "ReadShort:" inMs:ReadShort() SKIP "ReadUnsignedLong:" inMs:ReadUnsignedLong() SKIP "ReadUnsignedShort:" inMs:ReadUnsignedShort() SKIP VIEW-AS ALERT-BOX.

DEFINE VARIABLE myDate AS DATE INITIAL "1/1/2020".
DEFINE VARIABLE myInt64 AS INT64 INITIAL 42.
DEFINE VARIABLE myDouble AS DECIMAL INITIAL 42.42.
DEFINE VARIABLE myFloat AS DECIMAL INITIAL 42.42.
DEFINE VARIABLE myLong AS INTEGER INITIAL -53.
DEFINE VARIABLE myShort AS INTEGER INITIAL -53.
DEFINE VARIABLE myULong AS INTEGER INITIAL 123456789.
DEFINE VARIABLE myUShort AS INTEGER INITIAL 12345.
DEFINE VARIABLE inMs AS Progress.IO.MemoryInputStream.
DEFINE VARIABLE outMs AS Progress.IO.MemoryOutputStream.

outMs = NEW Progress.IO.MemoryOutputStream().
outMs:WriteLong(INTEGER(myDate)).
outMs:WriteInt64(myInt64).
outMs:WriteDouble(myDouble).
outMs:WriteFloat(myFloat).
outMs:WriteLong(myLong).
outMs:WriteShort(myShort).
outMs:WriteUnsignedLong(myULong).
outMs:WriteUnsignedShort(myUShort).

inMs = NEW Progress.IO.MemoryInputStream(INPUT outMs:Data).
MESSAGE
  "ReadLong:" inMs:ReadLong() SKIP
  "ReadInt64:" inMs:ReadINT64() SKIP
  "ReadDouble:" inMs:ReadDouble() SKIP
  "ReadFloat:" inMs:ReadFloat() SKIP
  "ReadLong:" inMs:ReadLong() SKIP
  "ReadShort:" inMs:ReadShort() SKIP
  "ReadUnsignedLong:" inMs:ReadUnsignedLong() SKIP
  "ReadUnsignedShort:" inMs:ReadUnsignedShort() SKIP
  VIEW-AS ALERT-BOX.

Table 2. READ & WRITE string methods
`DEFINE VARIABLE outMs AS Progress.IO.MemoryOutputStream. DEFINE VARIABLE InMs1 AS Progress.IO.MemoryInputStream. DEFINE VARIABLE InMs2 AS Progress.IO.MemoryInputStream. outMs = NEW Progress.IO.MemoryOutputStream(). outMs:Write("PROGRESS1",YES). outMs:Write("PROGRESSx2",YES). InMs1 = NEW Progress.IO.MemoryInputStream(INPUT outMs). MESSAGE InMs1:ReadString() VIEW-AS ALERT-BOX. MESSAGE STRING(InMs1:ReadLongchar()) VIEW-AS ALERT-BOX.`

DEFINE VARIABLE outMs AS Progress.IO.MemoryOutputStream. 
DEFINE VARIABLE InMs1 AS Progress.IO.MemoryInputStream. 
DEFINE VARIABLE InMs2 AS Progress.IO.MemoryInputStream. 

outMs = NEW Progress.IO.MemoryOutputStream().
outMs:Write("PROGRESS1",YES).
outMs:Write("PROGRESSx2",YES).

InMs1 = NEW Progress.IO.MemoryInputStream(INPUT outMs). 
MESSAGE InMs1:ReadString() 
  VIEW-AS ALERT-BOX.
MESSAGE STRING(InMs1:ReadLongchar()) 
  VIEW-AS ALERT-BOX.

ABL Reference