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2015-12-25 19:42

Appendix A: QMEMORYSTREAM

Rapid-Q Documentation by William Yu (c)1999	Appendix A: QMEMORYSTREAM

QMEMORYSTREAM Component

QMemorystream is used to store temporary data to memory for manipulation.

QMemorystream Properties

Field	Type	R/W	Default	Support

LineCount	INTEGER	R		W
	LineCount determines how many lines there are in the memorystream. Note that LineCount ignores the CR character, and will only detect LF, so it treats CRLF as one line, but LFLF as 2 lines.
Pointer	INTEGER	R		WXG
	Pointer specifies the memory address of the memorystream.
Position	INTEGER	RW		WXG
	Position specifies the current position of the memory pointer, any read/write operations will begin from here.
Size	INTEGER	RW		WXG
	Size determines the number of bytes allocated to the memorystream.

QMemorystream Methods

Method	Type	Description	Params	Support

Close	SUB	Close the stream Comment: If you close the memorystream, you reset the whole stream. No need to open it again (there isn't even an open method for qmemorystream), just write to the memorystream again. Alain 22 Aug 2002	0	WXG
CopyFrom	SUB (Stream, Bytes%)	Copy from another stream Either QFileStream or QMemoryStream	2	WXG
	Use CopyFrom to copy a QFILESTREAM or a QMEMORYSTREAM to the current memorystream. Details: If Bytes% = 0 then the Stream is reset to position 0 and the whole stream is then copied. Example: $INCLUDE "RAPIDQ.INC" DIM File1 AS QFILESTREAM DIM Mem AS QMEMORYSTREAM File1.Open("test.txt", fmOpenRead) Mem.CopyFrom(File1, 123) '-- Copy 123 bytes from File1
ExtractRes	SUB (Resource AS LONG)	Extract resource to memorystream	1	WXG
	Extracts a resource from your program to the memorystream. Details: The parameter Resource is not the resource handle, but the absolute position of the resource within your file. This requires that you use the keyword Resource(n) to specify the resource number. Example (dumping all resources): $INCLUDE "RAPIDQ.INC" $RESOURCE res_1 as "res.1" $RESOURCE res_2 as "res.2" DIM Mem AS QMEMORYSTREAM FOR I = 0 TO ResourceCount-1 Mem.ExtractRes(Resource(I)) NEXT
LoadArray	SUB (Array(), NumElements&)	Load data into array	2	WXG
MemCopyFrom	SUB (Address&, Bytes&)	Copies contents of Address& to memorystream	2	WXG
MemCopyTo	SUB (Address&, Bytes&)	Copies contents to Address&	2	WXG
Read	SUB (variable)	Generic Read, determines the storage space and saves data in variable	1	WXG
ReadLine	FUNCTION () AS STRING	Reads an entire line	0	W
ReadNum	FUNCTION (n) AS DOUBLE	Read n bytes, returns number	1	WXG
ReadStr	FUNCTION (n) AS STRING	Read n bytes, returns the string	1	WXG
ReadBinStr	FUNCTION (n) AS STRING	Read n bytes, returns the binary string	1	W
ReadUDT	SUB (MyType)	Read and store data in a MyType structure	1	WXG
SaveArray	SUB (Array(), NumElements&)	Save array	2	WXG
Seek	SUB (Position%, From%)	Seek to Position%, From% see RAPIDQ.INC	2	WXG
Write	SUB (variable)	Generic Write, determines the storage space and saves data to memory	1	WXG
WriteLine	SUB (S AS STRING)	Writes string with CR+LF	1	W
WriteNum	SUB (number, bytes%)	Writes a number to memory	2	WXG
WriteBinStr	SUB (string, bytes%)	Writes a binary string to file (slow)	2	W
WriteStr	SUB (string, bytes%)	Writes string to memory	2	WXG
WriteUDT	SUB (MyType)	Write data stored in a MyType structure	1	WXG

QMemoryStream Examples

  DIM Mem AS QMemoryStream

  S$ = "Hello world!"
  Mem.WriteStr(S$, LEN(S$))
  Mem.Position = 0
  S$ = Mem.ReadStr(LEN(S$))
  PRINT S$                            '' print it
  Mem.Close

'------------------------------------------------------

  DIM Mem AS QMemoryStream
  DIM I AS INTEGER

  I = 12
  Mem.Write(I)
  S$ = "Hello world!"
  Mem.Write(S$)
  Mem.Position = 0
  Mem.Read(I)
  S$ = SPACE$(I)
  Mem.Read(S$)
  PRINT S$                            '' print it
  Mem.Close

'------------------------------------------------------

  TYPE MyType
      Name AS STRING*30
      Phone AS STRING*8
      Age AS INTEGER
  END TYPE

  DIM Person AS MyType
      Person.Name = "Joe"
      Person.Phone = "555-5555"

  DIM Mem AS QMemoryStream
      Mem.WriteUDT(Person)

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