WRITEU Procedure

Writes binary (unformatted) data from an expression into a file.

WRITEU, unit, expr₁, ... , expr_n

unit The file unit to which the output will be sent.

expr_i Expressions to be output. For nonstring variables, the number of bytes contained in expr is output. For string variables, the number of bytes contained in the existing string is output.

None.

WRITEU performs a direct transfer, with no processing of any kind being done to the data.

In this example, WRITEU is used to write some data to a file. The READU procedure could then be used to read the data from the file.

d = BYTSCL(REFORM(FIX(100 * RANDOM(40000)), 200, 200))

; Create some data. Argument d contains a 200-by-200 byte array.

OPENW, unit, 'wuex.dat', /Get_Lun

; Open the file wuex.dat for writing.

WRITEU, unit, d

; Write the data in d to the wuex.dat file.

FREE_LUN, unit

; Close the file and free the file unit number.

OPEN (UNIX/OpenVMS), OPEN (Windows), READ

For more information and examples, see Chapter 8, Working with Data Files, in thePV-WAVE Programmer's Guide.