Changing Fields Directly in the Dialog Box

Transmit Specification 8

Specifying Transmit Data

Table 8-5 shows the buttons that are available from within the packet editor:

	Table 8-5. Packet Editor Buttons

Packet Editor Button	Editing Function

Compute CRC	Inserts the correct CRC error check value for the frame. You can use
	this option to create frames with or without correct CRC error check
	values.

Decode	Takes the values entered in the Hex View window of the packet edi-
	tor, decodes the packet, and displays the resulting decode in the
	Decode View window.

Undo	Undo the last editing action. Only one level of undo is supported.

OK	Save edits.

Cancel	Leave the editor without saving changes.

Editing in Decode View

Editing in decode view allows you to edit packets without remembering offsets. Click on a field and a dialog box pops up which shows the current value for the field and asks for a new value. The dialog boxes for each field is slightly different. Most dialog boxes display and allow you enter values in hexadecimal or decimal. Some contain a Use little-endian bit order check box if bit order swapping is required. Changes made in decode view are automatically reflected in hex view.

Editing in Hex View

Edits are made in hex view by placing the cursor at a location and overwriting the current values. You can also paste (Ctrl + V) the contents of the paste buffer into a location. Values are always overwritten starting at the current cursor location in hex view so offsets remain correct.

Press the Decode button to display edits made in hex view in the decode view. Note that changes to the decode view are not automatic. This provides the option of creating error packets that can’t be decoded properly.

Note

NDIS modules cannot transmit without a valid CRC.