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write field( obsolete and removed in FB 5.7.99 )   statement

write field[#] deviceID, handle

Use this statement to write the contents of the relocatable block specified by handle to the open file or serial port specified by deviceID, in a format suitable for input by the read field statement.
write field starts writing at the current "file mark" position. If first writes a 4-byte long-integer which indicates the size of the block; following this, it writes the contents of the block itself.

If you want to write only the block's contents to the file (without the 4-byte length indicator), use the write file statement instead:
write file# deviceID,[ handle ],fn GetHandleSize( handle )

See Also:
read field; write file; open