Read

Reads data from an opened OLE stream object.

To

Use

Read data into a string

Syntax 1

Read data into a character array or blob

Syntax 2


Syntax 1: For reading into a string

Description

Reads data from an OLE stream object into a string.

Applies to

OLEStream objects

Syntax

olestream.Read ( variable {, stopforline } )

Argument

Description

olestream

The name of an OLE stream variable that has been opened.

variable

The name of a string variable into which want to read data from olestream.

stopforline (optional)

A boolean value that specifies whether to read a line at a time. In other words, Read will stop reading at the next carriage return/linefeed. Values are:

  • TRUE -- (Default) Stop at the end of a line and leave the read pointer positioned after the carriage return/linefeed so the next read will read the next line

  • FALSE -- Read the whole stream or a maximum of 32,765 bytes


Return value

Integer. Returns the number of characters or bytes read. If an end-of-file mark (EOF) is encountered before any characters are read, Read returns -100. Read returns one of the following negative values if an error occurs:

-1 -- Stream is not open

-2 -- Read error

-9 -- Other error

If any argument's value is null, Read returns null.

Examples

This example opens an OLE object in the file MYSTUFF.OLE and assigns it to the OLEStorage object stg_stuff. Then it opens the stream called info in stg_stuff and assigns it to the stream object olestr_info. Finally, it reads the contents of olestr_info into the string ls_info.

The example does not check the functions' return values for success, but you should be sure to check the return values in your code:

boolean lb_memexists
OLEStorage stg_stuff
OLEStream olestr_info
blob ls_info
 
stg_stuff = CREATE OLEStorage
stg_stuff.Open("c:\ole2\mystuff.ole")
 
olestr_info.Open(stg_stuff, "info", &
    stgRead!, stgExclusive!)
olestr_info.Read(ls_info)

See also

Open

Length

Seek

Write

Syntax 2: For character arrays or blobs

Description

Reads data from an OLE stream object into a character array or blob.

Applies to

OLEStream objects

Syntax

olestream.Read ( variable {, maximumread } )

Argument

Description

olestream

The name of an OLE stream variable that has been opened.

variable

The name of a blob variable or character array into which want to read data from olestream.

maximumread (optional)

A long value specifying the maximum number of bytes to be read. The default is 32,765 or the length of olestream.


Return value

Integer. Returns 0 if it succeeds and one of the following negative values if an error occurs:

-1 -- Stream is not open

-2 -- Read error

-9 -- Other error

If any argument's value is null, Read returns null.

Examples

This example opens an OLE object in the file MYSTUFF.OLE and assigns it to the OLEStorage object stg_stuff. Then it opens the stream called info in stg_stuff and assigns it to the stream object olestr_info. Finally, it reads the contents of olestr_info into the blob lb_info.

The example does not check the functions' return values for success, but you should be sure to check the return values in your code:

boolean lb_memexists
OLEStorage stg_stuff
OLEStream olestr_info
blob lb_info
 
stg_stuff = CREATE OLEStorage
stg_stuff.Open("c:\ole2\mystuff.ole")
 
olestr_info.Open(stg_stuff, "info", &
    stgRead!, stgExclusive!)
olestr_info.Read(lb_info)

See also

Open

Length

Seek

Write